xserver xkeyboar-config mesa git update 16 May 2011

42 files changed, 13274 insertions, 12604 deletions

diff --git a/xorg-server/hw/dmx/Makefile.am b/xorg-server/hw/dmx/Makefile.am
index e0b201b82..fb727e656 100644
--- a/xorg-server/hw/dmx/Makefile.am
+++ b/xorg-server/hw/dmx/Makefile.am
@@ -1,5 +1,5 @@
 
-SUBDIRS = input config examples doc man
+SUBDIRS = input config examples doc doxygen man
 bin_PROGRAMS = Xdmx
 
 if XINERAMA
diff --git a/xorg-server/hw/dmx/dmxwindow.c b/xorg-server/hw/dmx/dmxwindow.c
index ef912b6a3..704fcff54 100644
--- a/xorg-server/hw/dmx/dmxwindow.c
+++ b/xorg-server/hw/dmx/dmxwindow.c
@@ -1,1017 +1,1017 @@
-/*

- * Copyright 2001-2004 Red Hat Inc., Durham, North Carolina.

- *

- * All Rights Reserved.

- *

- * Permission is hereby granted, free of charge, to any person obtaining

- * a copy of this software and associated documentation files (the

- * "Software"), to deal in the Software without restriction, including

- * without limitation on the rights to use, copy, modify, merge,

- * publish, distribute, sublicense, and/or sell copies of the Software,

- * and to permit persons to whom the Software is furnished to do so,

- * subject to the following conditions:

- *

- * The above copyright notice and this permission notice (including the

- * next paragraph) shall be included in all copies or substantial

- * portions of the Software.

- *

- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

- * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS

- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

- * SOFTWARE.

- */

-

-/*

- * Authors:

- *   Kevin E. Martin <kem@redhat.com>

- *

- */

-

-/** \file

- * This file provides support for window-related functions. */

-

-#ifdef HAVE_DMX_CONFIG_H

-#include <dmx-config.h>

-#endif

-

-#include "dmx.h"

-#include "dmxsync.h"

-#include "dmxwindow.h"

-#include "dmxpixmap.h"

-#include "dmxcmap.h"

-#include "dmxvisual.h"

-#include "dmxinput.h"

-#include "dmxextension.h"

-#include "dmxpict.h"

-

-#include "windowstr.h"

-

-static void dmxDoRestackWindow(WindowPtr pWindow);

-static void dmxDoChangeWindowAttributes(WindowPtr pWindow,

-					unsigned long *mask,

-					XSetWindowAttributes *attribs);

-

-static void dmxDoSetShape(WindowPtr pWindow);

-

-/** Initialize the private area for the window functions. */

-Bool dmxInitWindow(ScreenPtr pScreen)

-{

-    if (!dixRegisterPrivateKey(&dmxWinPrivateKeyRec, PRIVATE_WINDOW, sizeof(dmxWinPrivRec)))

-	return FALSE;

-

-    return TRUE;

-}

-

-

-Window dmxCreateRootWindow(WindowPtr pWindow)

-{

-    ScreenPtr             pScreen   = pWindow->drawable.pScreen;

-    DMXScreenInfo        *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr         pWinPriv  = DMX_GET_WINDOW_PRIV(pWindow);

-    Window                parent;

-    Visual               *visual;

-    unsigned long         mask;

-    XSetWindowAttributes  attribs;

-    ColormapPtr           pCmap;

-    dmxColormapPrivPtr    pCmapPriv;

-

-    /* Create root window */

-

-    parent = dmxScreen->scrnWin; /* This is our "Screen" window */

-    visual = dmxScreen->beVisuals[dmxScreen->beDefVisualIndex].visual;

-

-    dixLookupResourceByType((pointer*) &pCmap, wColormap(pWindow),

-			    RT_COLORMAP, NullClient, DixUnknownAccess);

-    pCmapPriv = DMX_GET_COLORMAP_PRIV(pCmap);

-

-    mask = CWEventMask | CWBackingStore | CWColormap | CWBorderPixel;

-    attribs.event_mask    = ExposureMask;

-    attribs.backing_store = NotUseful;

-    attribs.colormap      = pCmapPriv->cmap;

-    attribs.border_pixel  = 0;

-

-    /* Incorporate new attributes, if needed */

-    if (pWinPriv->attribMask) {

-	dmxDoChangeWindowAttributes(pWindow, &pWinPriv->attribMask, &attribs);

-	mask |= pWinPriv->attribMask;

-    }

-

-    return XCreateWindow(dmxScreen->beDisplay,

-			 parent,

-			 pWindow->origin.x - wBorderWidth(pWindow),

-			 pWindow->origin.y - wBorderWidth(pWindow),

-			 pWindow->drawable.width,

-			 pWindow->drawable.height,

-			 pWindow->borderWidth,

-			 pWindow->drawable.depth,

-			 pWindow->drawable.class,

-			 visual,

-			 mask,

-			 &attribs);

-}

-

-/** Change the location and size of the "screen" window.  Called from

- *  #dmxConfigureScreenWindow(). */

-void dmxResizeScreenWindow(ScreenPtr pScreen,

-			   int x, int y, int w, int h)

-{

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    unsigned int    m;

-    XWindowChanges  c;

-

-    if (!dmxScreen->beDisplay)

-	return;

-

-    /* Handle resizing on back-end server */

-    m = CWX | CWY | CWWidth | CWHeight;

-    c.x = x;

-    c.y = y;

-    c.width = w;

-    c.height = h;

-

-    XConfigureWindow(dmxScreen->beDisplay, dmxScreen->scrnWin, m, &c);

-    dmxSync(dmxScreen, False);

-}

-

-/** Change the location and size of the "root" window.  Called from

- *  #dmxConfigureRootWindow. */

-void dmxResizeRootWindow(WindowPtr pRoot,

-			 int x, int y, int w, int h)

-{

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pRoot->drawable.pScreen->myNum];

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pRoot);

-    unsigned int    m;

-    XWindowChanges  c;

-

-    /* Handle resizing on back-end server */

-    if (dmxScreen->beDisplay) {

-	m = CWX | CWY | CWWidth | CWHeight;

-	c.x = x;

-	c.y = y;

-	c.width = (w > 0) ? w : 1;

-	c.height = (h > 0) ? h : 1;

-

-	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);

-    }

-

-    if (w == 0 || h == 0) {

-	if (pWinPriv->mapped) {

-	    if (dmxScreen->beDisplay)

-		XUnmapWindow(dmxScreen->beDisplay, pWinPriv->window);

-	    pWinPriv->mapped = FALSE;

-	}

-    } else if (!pWinPriv->mapped) {

-	if (dmxScreen->beDisplay)

-	    XMapWindow(dmxScreen->beDisplay, pWinPriv->window);

-	pWinPriv->mapped = TRUE;

-    }

-

-    if (dmxScreen->beDisplay)

-	dmxSync(dmxScreen, False);

-}

-

-void dmxGetDefaultWindowAttributes(WindowPtr pWindow,

-				   Colormap *cmap,

-				   Visual **visual)

-{

-    ScreenPtr  pScreen = pWindow->drawable.pScreen;

-

-    if (pWindow->drawable.class != InputOnly &&

-	pWindow->optional &&

-	pWindow->optional->visual != wVisual(pWindow->parent)) {

-

-	/* Find the matching visual */

-	*visual = dmxLookupVisualFromID(pScreen, wVisual(pWindow));

-

-	/* Handle optional colormaps */

-	if (pWindow->optional->colormap) {

-	    ColormapPtr         pCmap;

-	    dmxColormapPrivPtr  pCmapPriv;

-

-	    dixLookupResourceByType((pointer*) &pCmap, wColormap(pWindow),

-				    RT_COLORMAP, NullClient, DixUnknownAccess);

-	    pCmapPriv = DMX_GET_COLORMAP_PRIV(pCmap);

-	    *cmap = pCmapPriv->cmap;

-	} else {

-	    *cmap = dmxColormapFromDefaultVisual(pScreen, *visual);

-	}

-    } else {

-	*visual = CopyFromParent;

-	*cmap = (Colormap)0;

-    }

-}

-

-static Window dmxCreateNonRootWindow(WindowPtr pWindow)

-{

-    ScreenPtr             pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo        *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr         pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    Window                parent;

-    unsigned long         mask = 0L;

-    XSetWindowAttributes  attribs;

-    dmxWinPrivPtr         pParentPriv = DMX_GET_WINDOW_PRIV(pWindow->parent);

-

-    /* Create window on back-end server */

-

-    parent = pParentPriv->window;

-

-    /* The parent won't exist if this call to CreateNonRootWindow came

-       from ReparentWindow and the grandparent window has not yet been

-       created */

-    if (!parent) {

-	dmxCreateAndRealizeWindow(pWindow->parent, FALSE);

-	parent = pParentPriv->window;

-    }

-

-    /* Incorporate new attributes, if needed */

-    if (pWinPriv->attribMask) {

-	dmxDoChangeWindowAttributes(pWindow, &pWinPriv->attribMask, &attribs);

-	mask |= pWinPriv->attribMask;

-    }

-

-    /* Add in default attributes */

-    if (pWindow->drawable.class != InputOnly) {

-	mask |= CWBackingStore;

-	attribs.backing_store = NotUseful;

-

-	if (!(mask & CWColormap) && pWinPriv->cmap) {

-	    mask |= CWColormap;

-	    attribs.colormap = pWinPriv->cmap;

-	    if (!(mask & CWBorderPixel)) {

-		mask |= CWBorderPixel;

-		attribs.border_pixel = 0;

-	    }

-	}

-    }

-

-    /* Handle case where subwindows are being mapped, but created out of

-       order -- if current window has a previous sibling, then it cannot

-       be created on top of the stack, so we must restack the windows */

-    pWinPriv->restacked = (pWindow->prevSib != NullWindow);

-

-    return XCreateWindow(dmxScreen->beDisplay,

-			 parent,

-			 pWindow->origin.x - wBorderWidth(pWindow),

-			 pWindow->origin.y - wBorderWidth(pWindow),

-			 pWindow->drawable.width,

-			 pWindow->drawable.height,

-			 pWindow->borderWidth,

-			 pWindow->drawable.depth,

-			 pWindow->drawable.class,

-			 pWinPriv->visual,

-			 mask,

-			 &attribs);

-}

-

-/** This function handles lazy window creation and realization.  Window

- *  creation is handled by #dmxCreateNonRootWindow().  It also handles

- *  any stacking changes that have occured since the window was

- *  originally created by calling #dmxDoRestackWindow().  If the window

- *  is shaped, the shape is set on the back-end server by calling

- *  #dmxDoSetShape(), and if the window has pictures (from RENDER)

- *  associated with it, those pictures are created on the back-end

- *  server by calling #dmxCreatePictureList().  If \a doSync is TRUE,

- *  then #dmxSync() is called. */

-void dmxCreateAndRealizeWindow(WindowPtr pWindow, Bool doSync)

-{

-    ScreenPtr      pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-

-    if (!dmxScreen->beDisplay) return;

-

-    pWinPriv->window = dmxCreateNonRootWindow(pWindow);

-    if (pWinPriv->restacked) dmxDoRestackWindow(pWindow);

-    if (pWinPriv->isShaped) dmxDoSetShape(pWindow);

-    if (pWinPriv->hasPict) dmxCreatePictureList(pWindow);

-    if (pWinPriv->mapped) XMapWindow(dmxScreen->beDisplay,

-				      pWinPriv->window);

-    if (doSync) dmxSync(dmxScreen, False);

-}

-

-/** Create \a pWindow on the back-end server.  If the lazy window

- *  creation optimization is enabled, then the actual creation and

- *  realization of the window is handled by

- *  #dmxCreateAndRealizeWindow(). */

-Bool dmxCreateWindow(WindowPtr pWindow)

-{

-    ScreenPtr             pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo        *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr         pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    Bool                  ret = TRUE;

-

-    DMX_UNWRAP(CreateWindow, dmxScreen, pScreen);

-#if 0

-    if (pScreen->CreateWindow)

-	ret = pScreen->CreateWindow(pWindow);

-#endif

-

-    /* Set up the defaults */

-    pWinPriv->window     = (Window)0;

-    pWinPriv->offscreen  = TRUE;

-    pWinPriv->mapped     = FALSE;

-    pWinPriv->restacked  = FALSE;

-    pWinPriv->attribMask = 0;

-    pWinPriv->isShaped   = FALSE;

-    pWinPriv->hasPict    = FALSE;

-#ifdef GLXEXT

-    pWinPriv->swapGroup  = NULL;

-    pWinPriv->barrier    = 0;

-#endif

-

-    if (dmxScreen->beDisplay) {

-	/* Only create the root window at this stage -- non-root windows are

-	   created when they are mapped and are on-screen */

-	if (!pWindow->parent) {

-	    dmxScreen->rootWin = pWinPriv->window

-		= dmxCreateRootWindow(pWindow);

-	    if (dmxScreen->scrnX         != dmxScreen->rootX

-		|| dmxScreen->scrnY      != dmxScreen->rootY

-		|| dmxScreen->scrnWidth  != dmxScreen->rootWidth

-		|| dmxScreen->scrnHeight != dmxScreen->rootHeight) {

-		dmxResizeRootWindow(pWindow,

-				    dmxScreen->rootX,

-				    dmxScreen->rootY,

-				    dmxScreen->rootWidth,

-				    dmxScreen->rootHeight);

-		dmxUpdateScreenResources(screenInfo.screens[dmxScreen->index],

-					 dmxScreen->rootX,

-					 dmxScreen->rootY,

-					 dmxScreen->rootWidth,

-					 dmxScreen->rootHeight);

-		pWindow->origin.x = dmxScreen->rootX;

-		pWindow->origin.y = dmxScreen->rootY;

-	    }

-	} else {

-	    dmxGetDefaultWindowAttributes(pWindow,

-					  &pWinPriv->cmap,

-					  &pWinPriv->visual);

-

-	    if (dmxLazyWindowCreation) {

-		/* Save parent's visual for use later */

-		if (pWinPriv->visual == CopyFromParent)

-		    pWinPriv->visual =

-			dmxLookupVisualFromID(pScreen,

-					      wVisual(pWindow->parent));

-	    } else {

-		pWinPriv->window = dmxCreateNonRootWindow(pWindow);

-	    }

-	}

-

-	dmxSync(dmxScreen, False);

-    }

-

-    DMX_WRAP(CreateWindow, dmxCreateWindow, dmxScreen, pScreen);

-

-    return ret;

-}

-

-/** Destroy \a pWindow on the back-end server. */

-Bool dmxBEDestroyWindow(WindowPtr pWindow)

-{

-    ScreenPtr      pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-

-    if (pWinPriv->window) {

-	XDestroyWindow(dmxScreen->beDisplay, pWinPriv->window);

-	pWinPriv->window = (Window)0;

-	return TRUE;

-    }

-

-    return FALSE;

-}

-

-/** Destroy \a pWindow on the back-end server.  If any RENDER pictures

-    were created, destroy them as well. */

-Bool dmxDestroyWindow(WindowPtr pWindow)

-{

-    ScreenPtr      pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

-    Bool           ret = TRUE;

-    Bool           needSync = FALSE;

-#ifdef GLXEXT

-    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-#endif

-

-    DMX_UNWRAP(DestroyWindow, dmxScreen, pScreen);

-

-    /* Destroy any picture list associated with this window */

-    needSync |= dmxDestroyPictureList(pWindow);

-

-    /* Destroy window on back-end server */

-    needSync |= dmxBEDestroyWindow(pWindow);

-    if (needSync) dmxSync(dmxScreen, FALSE);

-

-#ifdef GLXEXT

-    if (pWinPriv->swapGroup && pWinPriv->windowDestroyed)

-	pWinPriv->windowDestroyed(pWindow);

-#endif

-

-    if (pScreen->DestroyWindow)

-	ret = pScreen->DestroyWindow(pWindow);

-

-    DMX_WRAP(DestroyWindow, dmxDestroyWindow, dmxScreen, pScreen);

-

-    return ret;

-}

-

-/** Change the position of \a pWindow to be \a x, \a y. */

-Bool dmxPositionWindow(WindowPtr pWindow, int x, int y)

-{

-    ScreenPtr       pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    Bool            ret = TRUE;

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    unsigned int    m;

-    XWindowChanges  c;

-

-    DMX_UNWRAP(PositionWindow, dmxScreen, pScreen);

-#if 0

-    if (pScreen->PositionWindow)

-	ret = pScreen->PositionWindow(pWindow, x, y);

-#endif

-

-    /* Determine if the window is completely off the visible portion of

-       the screen */

-    pWinPriv->offscreen = DMX_WINDOW_OFFSCREEN(pWindow);

-

-    /* If the window is now on-screen and it is mapped and it has not

-       been created yet, create it and map it */

-    if (!pWinPriv->window && pWinPriv->mapped && !pWinPriv->offscreen) {

-	dmxCreateAndRealizeWindow(pWindow, TRUE);

-    } else if (pWinPriv->window) {

-	/* Position window on back-end server */

-	m = CWX | CWY | CWWidth | CWHeight;

-	c.x = pWindow->origin.x - wBorderWidth(pWindow);

-	c.y = pWindow->origin.y - wBorderWidth(pWindow);

-	c.width = pWindow->drawable.width;

-	c.height = pWindow->drawable.height;

-	if (pWindow->drawable.class != InputOnly) {

-	    m |= CWBorderWidth;

-	    c.border_width = pWindow->borderWidth;

-	}

-

-	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);

-	dmxSync(dmxScreen, False);

-    }

-

-    DMX_WRAP(PositionWindow, dmxPositionWindow, dmxScreen, pScreen);

-

-    return ret;

-}

-

-static void dmxDoChangeWindowAttributes(WindowPtr pWindow,

-					unsigned long *mask,

-					XSetWindowAttributes *attribs)

-{

-    dmxPixPrivPtr         pPixPriv;

-

-    if (*mask & CWBackPixmap) {

-	switch (pWindow->backgroundState) {

-	case None:

-	    attribs->background_pixmap = None;

-	    break;

-

-	case ParentRelative:

-	    attribs->background_pixmap = ParentRelative;

-	    break;

-

-	case BackgroundPixmap:

-	    pPixPriv = DMX_GET_PIXMAP_PRIV(pWindow->background.pixmap);

-	    attribs->background_pixmap = pPixPriv->pixmap;

-	    break;

-

-	case BackgroundPixel:

-	    *mask &= ~CWBackPixmap;

-	    break;

-	}

-    }

-

-    if (*mask & CWBackPixel) {

-	if (pWindow->backgroundState == BackgroundPixel)

-	    attribs->background_pixel = pWindow->background.pixel;

-	else

-	    *mask &= ~CWBackPixel;

-    }

-

-    if (*mask & CWBorderPixmap) {

-	if (pWindow->borderIsPixel)

-	    *mask &= ~CWBorderPixmap;

-	else {

-	    pPixPriv = DMX_GET_PIXMAP_PRIV(pWindow->border.pixmap);

-	    attribs->border_pixmap = pPixPriv->pixmap;

-	}

-    }

-

-    if (*mask & CWBorderPixel) {

-	if (pWindow->borderIsPixel)

-	    attribs->border_pixel = pWindow->border.pixel;

-	else

-	    *mask &= ~CWBorderPixel;

-    }

-

-    if (*mask & CWBitGravity)

-	attribs->bit_gravity = pWindow->bitGravity;

-

-    if (*mask & CWWinGravity)

-	*mask &= ~CWWinGravity; /* Handled by dix */

-

-    if (*mask & CWBackingStore)

-	*mask &= ~CWBackingStore; /* Backing store not supported */

-

-    if (*mask & CWBackingPlanes)

-	*mask &= ~CWBackingPlanes; /* Backing store not supported */

-

-    if (*mask & CWBackingPixel)

-	*mask &= ~CWBackingPixel; /* Backing store not supported */

-

-    if (*mask & CWOverrideRedirect)

-	attribs->override_redirect = pWindow->overrideRedirect;

-

-    if (*mask & CWSaveUnder)

-	*mask &= ~CWSaveUnder; /* Save unders not supported */

-

-    if (*mask & CWEventMask)

-	*mask &= ~CWEventMask; /* Events are handled by dix */

-

-    if (*mask & CWDontPropagate)

-	*mask &= ~CWDontPropagate; /* Events are handled by dix */

-

-    if (*mask & CWColormap) {

-	ColormapPtr         pCmap;

-	dmxColormapPrivPtr  pCmapPriv;

-

-	dixLookupResourceByType((pointer*) &pCmap, wColormap(pWindow),

-				RT_COLORMAP, NullClient, DixUnknownAccess);

-	pCmapPriv = DMX_GET_COLORMAP_PRIV(pCmap);

-	attribs->colormap = pCmapPriv->cmap;

-    }

-

-    if (*mask & CWCursor)

-	*mask &= ~CWCursor; /* Handled by the cursor code */

-}

-

-/** Change the window attributes of \a pWindow. */

-Bool dmxChangeWindowAttributes(WindowPtr pWindow, unsigned long mask)

-{

-    ScreenPtr             pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo        *dmxScreen = &dmxScreens[pScreen->myNum];

-    Bool                  ret = TRUE;

-    dmxWinPrivPtr         pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    XSetWindowAttributes  attribs;

-

-    DMX_UNWRAP(ChangeWindowAttributes, dmxScreen, pScreen);

-#if 0

-    if (pScreen->ChangeWindowAttributes)

-	ret = pScreen->ChangeWindowAttributes(pWindow, mask);

-#endif

-

-    /* Change window attribs on back-end server */

-    dmxDoChangeWindowAttributes(pWindow, &mask, &attribs);

-

-    /* Save mask for lazy window creation optimization */

-    pWinPriv->attribMask |= mask;

-

-    if (mask && pWinPriv->window) {

-	XChangeWindowAttributes(dmxScreen->beDisplay, pWinPriv->window,

-				mask, &attribs);

-	dmxSync(dmxScreen, False);

-    }

-

-    DMX_WRAP(ChangeWindowAttributes, dmxChangeWindowAttributes, dmxScreen,

-	     pScreen);

-

-    return ret;

-}

-

-/** Realize \a pWindow on the back-end server.  If the lazy window

- *  creation optimization is enabled, the window is only realized when

- *  it at least partially overlaps the screen. */

-Bool dmxRealizeWindow(WindowPtr pWindow)

-{

-    ScreenPtr      pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

-    Bool           ret = TRUE;

-    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-

-    DMX_UNWRAP(RealizeWindow, dmxScreen, pScreen);

-#if 0

-    if (pScreen->RealizeWindow)

-	ret = pScreen->RealizeWindow(pWindow);

-#endif

-

-    /* Determine if the window is completely off the visible portion of

-       the screen */

-    pWinPriv->offscreen = DMX_WINDOW_OFFSCREEN(pWindow);

-

-    /* If the window hasn't been created and it's not offscreen, then

-       create it */

-    if (!pWinPriv->window && !pWinPriv->offscreen) {

-	dmxCreateAndRealizeWindow(pWindow, FALSE);

-    }

-

-    if (pWinPriv->window) {

-	/* Realize window on back-end server */

-	XMapWindow(dmxScreen->beDisplay, pWinPriv->window);

-	dmxSync(dmxScreen, False);

-    }

-

-    /* Let the other functions know that the window is now mapped */

-    pWinPriv->mapped = TRUE;

-

-    DMX_WRAP(RealizeWindow, dmxRealizeWindow, dmxScreen, pScreen);

-

-    dmxUpdateWindowInfo(DMX_UPDATE_REALIZE, pWindow);

-    return ret;

-}

-

-/** Unrealize \a pWindow on the back-end server. */

-Bool dmxUnrealizeWindow(WindowPtr pWindow)

-{

-    ScreenPtr      pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

-    Bool           ret = TRUE;

-    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-

-    DMX_UNWRAP(UnrealizeWindow, dmxScreen, pScreen);

-#if 0

-    if (pScreen->UnrealizeWindow)

-	ret = pScreen->UnrealizeWindow(pWindow);

-#endif

-

-    if (pWinPriv->window) {

-	/* Unrealize window on back-end server */

-	XUnmapWindow(dmxScreen->beDisplay, pWinPriv->window);

-	dmxSync(dmxScreen, False);

-    }

-

-    /* When unrealized (i.e., unmapped), the window is always considered

-       off of the visible portion of the screen */

-    pWinPriv->offscreen = TRUE;

-    pWinPriv->mapped = FALSE;

-

-#ifdef GLXEXT

-    if (pWinPriv->swapGroup && pWinPriv->windowUnmapped)

-	pWinPriv->windowUnmapped(pWindow);

-#endif

-

-    DMX_WRAP(UnrealizeWindow, dmxUnrealizeWindow, dmxScreen, pScreen);

-

-    dmxUpdateWindowInfo(DMX_UPDATE_UNREALIZE, pWindow);

-    return ret;

-}

-

-static void dmxDoRestackWindow(WindowPtr pWindow)

-{

-    ScreenPtr       pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    WindowPtr       pNextSib = pWindow->nextSib;

-    unsigned int    m;

-    XWindowChanges  c;

-

-    if (pNextSib == NullWindow) {

-	/* Window is at the bottom of the stack */

-	m = CWStackMode;

-	c.sibling = (Window)0;

-	c.stack_mode = Below;

-	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);

-    } else {

-	/* Window is not at the bottom of the stack */

-	dmxWinPrivPtr  pNextSibPriv = DMX_GET_WINDOW_PRIV(pNextSib);

-

-	/* Handle case where siblings have not yet been created due to

-           lazy window creation optimization by first finding the next

-           sibling in the sibling list that has been created (if any)

-           and then putting the current window just above that sibling,

-           and if no next siblings have been created yet, then put it at

-           the bottom of the stack (since it might have a previous

-           sibling that should be above it). */

-	while (!pNextSibPriv->window) {

-	    pNextSib = pNextSib->nextSib;

-	    if (pNextSib == NullWindow) {

-		/* Window is at the bottom of the stack */

-		m = CWStackMode;

-		c.sibling = (Window)0;

-		c.stack_mode = Below;

-		XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);

-		return;

-	    }

-	    pNextSibPriv = DMX_GET_WINDOW_PRIV(pNextSib);

-	}

-

-	m = CWStackMode | CWSibling;

-	c.sibling = pNextSibPriv->window;

-	c.stack_mode = Above;

-	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);

-    }

-}

-

-/** Handle window restacking.  The actual restacking occurs in

- *  #dmxDoRestackWindow(). */

-void dmxRestackWindow(WindowPtr pWindow, WindowPtr pOldNextSib)

-{

-    ScreenPtr       pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-

-    DMX_UNWRAP(RestackWindow, dmxScreen, pScreen);

-#if 0

-    if (pScreen->RestackWindow)

-	pScreen->RestackWindow(pWindow, pOldNextSib);

-#endif

-

-    if (pOldNextSib != pWindow->nextSib) {

-	/* Track restacking for lazy window creation optimization */

-	pWinPriv->restacked = TRUE;

-

-	/* Restack window on back-end server */

-	if (pWinPriv->window) {

-	    dmxDoRestackWindow(pWindow);

-	    dmxSync(dmxScreen, False);

-	}

-    }

-

-    DMX_WRAP(RestackWindow, dmxRestackWindow, dmxScreen, pScreen);

-    dmxUpdateWindowInfo(DMX_UPDATE_RESTACK, pWindow);

-}

-

-static Bool dmxWindowExposurePredicate(Display *dpy, XEvent *ev, XPointer ptr)

-{

-    return (ev->type == Expose && ev->xexpose.window == *(Window *)ptr);

-}

-

-/** Handle exposures on \a pWindow.  Since window exposures are handled

- *  in DMX, the events that are generated by the back-end server are

- *  redundant, so we eat them here. */

-void dmxWindowExposures(WindowPtr pWindow, RegionPtr prgn,

-			RegionPtr other_exposed)

-{

-    ScreenPtr      pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    XEvent         ev;

-

-    DMX_UNWRAP(WindowExposures, dmxScreen, pScreen);

-

-    dmxSync(dmxScreen, False);

-

-    if (pWinPriv->window) {

-	while (XCheckIfEvent(dmxScreen->beDisplay, &ev,

-			     dmxWindowExposurePredicate,

-			     (XPointer)&pWinPriv->window)) {

-	    /* Handle expose events -- this should not be necessary

-	       since the base window in which the root window was

-	       created is guaranteed to be on top (override_redirect),

-	       so we should just swallow these events.  If for some

-	       reason the window is not on top, then we'd need to

-	       collect these events and send them to the client later

-	       (e.g., during the block handler as Xnest does). */

-	}

-    }

-

-#if 1

-    if (pScreen->WindowExposures)

-	pScreen->WindowExposures(pWindow, prgn, other_exposed);

-#endif

-    DMX_WRAP(WindowExposures, dmxWindowExposures, dmxScreen, pScreen);

-}

-

-/** Move \a pWindow on the back-end server.  Determine whether or not it

- *  is on or offscreen, and realize it if it is newly on screen and the

- *  lazy window creation optimization is enabled. */

-void dmxCopyWindow(WindowPtr pWindow, DDXPointRec ptOldOrg, RegionPtr prgnSrc)

-{

-    ScreenPtr       pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    unsigned int    m;

-    XWindowChanges  c;

-

-    DMX_UNWRAP(CopyWindow, dmxScreen, pScreen);

-#if 0

-    if (pScreen->CopyWindow)

-	pScreen->CopyWindow(pWindow, ptOldOrg, prgnSrc);

-#endif

-

-    /* Determine if the window is completely off the visible portion of

-       the screen */

-    pWinPriv->offscreen = DMX_WINDOW_OFFSCREEN(pWindow);

-

-    /* If the window is now on-screen and it is mapped and it has not

-       been created yet, create it and map it */

-    if (!pWinPriv->window && pWinPriv->mapped && !pWinPriv->offscreen) {

-	dmxCreateAndRealizeWindow(pWindow, TRUE);

-    } else if (pWinPriv->window) {

-	/* Move window on back-end server */

-	m = CWX | CWY | CWWidth | CWHeight;

-	c.x = pWindow->origin.x - wBorderWidth(pWindow);

-	c.y = pWindow->origin.y - wBorderWidth(pWindow);

-	c.width = pWindow->drawable.width;

-	c.height = pWindow->drawable.height;

-

-	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);

-	dmxSync(dmxScreen, False);

-    }

-

-    DMX_WRAP(CopyWindow, dmxCopyWindow, dmxScreen, pScreen);

-    dmxUpdateWindowInfo(DMX_UPDATE_COPY, pWindow);

-}

-

-/** Resize \a pWindow on the back-end server.  Determine whether or not

- *  it is on or offscreen, and realize it if it is newly on screen and

- *  the lazy window creation optimization is enabled. */

-void dmxResizeWindow(WindowPtr pWindow, int x, int y,

-		     unsigned int w, unsigned int h, WindowPtr pSib)

-{

-    ScreenPtr       pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    dmxWinPrivPtr   pSibPriv;

-    unsigned int    m;

-    XWindowChanges  c;

-

-    if (pSib)

-	pSibPriv = DMX_GET_WINDOW_PRIV(pSib);

-

-    DMX_UNWRAP(ResizeWindow, dmxScreen, pScreen);

-#if 1

-    if (pScreen->ResizeWindow)

-	pScreen->ResizeWindow(pWindow, x, y, w, h, pSib);

-#endif

-

-    /* Determine if the window is completely off the visible portion of

-       the screen */

-    pWinPriv->offscreen = DMX_WINDOW_OFFSCREEN(pWindow);

-

-    /* If the window is now on-screen and it is mapped and it has not

-       been created yet, create it and map it */

-    if (!pWinPriv->window && pWinPriv->mapped && !pWinPriv->offscreen) {

-	dmxCreateAndRealizeWindow(pWindow, TRUE);

-    } else if (pWinPriv->window) {

-	/* Handle resizing on back-end server */

-	m = CWX | CWY | CWWidth | CWHeight;

-	c.x = pWindow->origin.x - wBorderWidth(pWindow);

-	c.y = pWindow->origin.y - wBorderWidth(pWindow);

-	c.width = pWindow->drawable.width;

-	c.height = pWindow->drawable.height;

-

-	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);

-	dmxSync(dmxScreen, False);

-    }

-

-    DMX_WRAP(ResizeWindow, dmxResizeWindow, dmxScreen, pScreen);

-    dmxUpdateWindowInfo(DMX_UPDATE_RESIZE, pWindow);

-}

-

-/** Reparent \a pWindow on the back-end server. */

-void dmxReparentWindow(WindowPtr pWindow, WindowPtr pPriorParent)

-{

-    ScreenPtr      pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    dmxWinPrivPtr  pParentPriv = DMX_GET_WINDOW_PRIV(pWindow->parent);

-

-    DMX_UNWRAP(ReparentWindow, dmxScreen, pScreen);

-#if 0

-    if (pScreen->ReparentWindow)

-	pScreen->ReparentWindow(pWindow, pPriorParent);

-#endif

-

-    if (pWinPriv->window) {

-	if (!pParentPriv->window) {

-	    dmxCreateAndRealizeWindow(pWindow->parent, FALSE);

-	}

-

-	/* Handle reparenting on back-end server */

-	XReparentWindow(dmxScreen->beDisplay, pWinPriv->window,

-			pParentPriv->window,

-			pWindow->origin.x - wBorderWidth(pWindow),

-			pWindow->origin.x - wBorderWidth(pWindow));

-	dmxSync(dmxScreen, False);

-    }

-

-    DMX_WRAP(ReparentWindow, dmxReparentWindow, dmxScreen, pScreen);

-    dmxUpdateWindowInfo(DMX_UPDATE_REPARENT, pWindow);

-}

-

-/** Change border width for \a pWindow to \a width pixels. */

-void dmxChangeBorderWidth(WindowPtr pWindow, unsigned int width)

-{

-    ScreenPtr       pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    unsigned int    m;

-    XWindowChanges  c;

-

-    DMX_UNWRAP(ChangeBorderWidth, dmxScreen, pScreen);

-#if 1

-    if (pScreen->ChangeBorderWidth)

-	pScreen->ChangeBorderWidth(pWindow, width);

-#endif

-

-    /* NOTE: Do we need to check for on/off screen here? */

-

-    if (pWinPriv->window) {

-	/* Handle border width change on back-end server */

-	m = CWBorderWidth;

-	c.border_width = width;

-

-	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);

-	dmxSync(dmxScreen, False);

-    }

-

-    DMX_WRAP(ChangeBorderWidth, dmxChangeBorderWidth, dmxScreen, pScreen);

-}

-

-static void dmxDoSetShape(WindowPtr pWindow)

-{

-    ScreenPtr       pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-    int             nBox;

-    BoxPtr          pBox;

-    int             nRect;

-    XRectangle     *pRect;

-    XRectangle     *pRectFirst;

-

-    /* First, set the bounding shape */

-    if (wBoundingShape(pWindow)) {

-	pBox = RegionRects(wBoundingShape(pWindow));

-	nRect = nBox = RegionNumRects(wBoundingShape(pWindow));

-	pRectFirst = pRect = malloc(nRect * sizeof(*pRect));

-	while (nBox--) {

-	    pRect->x      = pBox->x1;

-	    pRect->y      = pBox->y1;

-	    pRect->width  = pBox->x2 - pBox->x1;

-	    pRect->height = pBox->y2 - pBox->y1;

-	    pBox++;

-	    pRect++;

-	}

-	XShapeCombineRectangles(dmxScreen->beDisplay, pWinPriv->window,

-				ShapeBounding, 0, 0,

-				pRectFirst, nRect,

-				ShapeSet, YXBanded);

-	free(pRectFirst);

-    } else {

-	XShapeCombineMask(dmxScreen->beDisplay, pWinPriv->window,

-			  ShapeBounding, 0, 0, None, ShapeSet);

-    }

-

-    /* Next, set the clip shape */

-    if (wClipShape(pWindow)) {

-	pBox = RegionRects(wClipShape(pWindow));

-	nRect = nBox = RegionNumRects(wClipShape(pWindow));

-	pRectFirst = pRect = malloc(nRect * sizeof(*pRect));

-	while (nBox--) {

-	    pRect->x      = pBox->x1;

-	    pRect->y      = pBox->y1;

-	    pRect->width  = pBox->x2 - pBox->x1;

-	    pRect->height = pBox->y2 - pBox->y1;

-	    pBox++;

-	    pRect++;

-	}

-	XShapeCombineRectangles(dmxScreen->beDisplay, pWinPriv->window,

-				ShapeClip, 0, 0,

-				pRectFirst, nRect,

-				ShapeSet, YXBanded);

-	free(pRectFirst);

-    } else {

-	XShapeCombineMask(dmxScreen->beDisplay, pWinPriv->window,

-			  ShapeClip, 0, 0, None, ShapeSet);

-    }

-

-    if (XShapeInputSelected(dmxScreen->beDisplay, pWinPriv->window)) {

-	ErrorF("Input selected for window %x on Screen %d\n",

-	       (unsigned int)pWinPriv->window, pScreen->myNum);

-    }

-}

-

-/** Set shape of \a pWindow on the back-end server. */

-void dmxSetShape(WindowPtr pWindow, int kind)

-{

-    ScreenPtr       pScreen = pWindow->drawable.pScreen;

-    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];

-    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);

-

-    DMX_UNWRAP(SetShape, dmxScreen, pScreen);

-#if 1

-    if (pScreen->SetShape)

-	pScreen->SetShape(pWindow, kind);

-#endif

-

-    if (pWinPriv->window) {

-	/* Handle setting the current shape on the back-end server */

-	dmxDoSetShape(pWindow);

-	dmxSync(dmxScreen, False);

-    } else {

-	pWinPriv->isShaped = TRUE;

-    }

-

-    DMX_WRAP(SetShape, dmxSetShape, dmxScreen, pScreen);

-}

+/*
+ * Copyright 2001-2004 Red Hat Inc., Durham, North Carolina.
+ *
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation on the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * Authors:
+ *   Kevin E. Martin <kem@redhat.com>
+ *
+ */
+
+/** \file
+ * This file provides support for window-related functions. */
+
+#ifdef HAVE_DMX_CONFIG_H
+#include <dmx-config.h>
+#endif
+
+#include "dmx.h"
+#include "dmxsync.h"
+#include "dmxwindow.h"
+#include "dmxpixmap.h"
+#include "dmxcmap.h"
+#include "dmxvisual.h"
+#include "dmxinput.h"
+#include "dmxextension.h"
+#include "dmxpict.h"
+
+#include "windowstr.h"
+
+static void dmxDoRestackWindow(WindowPtr pWindow);
+static void dmxDoChangeWindowAttributes(WindowPtr pWindow,
+					unsigned long *mask,
+					XSetWindowAttributes *attribs);
+
+static void dmxDoSetShape(WindowPtr pWindow);
+
+/** Initialize the private area for the window functions. */
+Bool dmxInitWindow(ScreenPtr pScreen)
+{
+    if (!dixRegisterPrivateKey(&dmxWinPrivateKeyRec, PRIVATE_WINDOW, sizeof(dmxWinPrivRec)))
+	return FALSE;
+
+    return TRUE;
+}
+
+
+Window dmxCreateRootWindow(WindowPtr pWindow)
+{
+    ScreenPtr             pScreen   = pWindow->drawable.pScreen;
+    DMXScreenInfo        *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr         pWinPriv  = DMX_GET_WINDOW_PRIV(pWindow);
+    Window                parent;
+    Visual               *visual;
+    unsigned long         mask;
+    XSetWindowAttributes  attribs;
+    ColormapPtr           pCmap;
+    dmxColormapPrivPtr    pCmapPriv;
+
+    /* Create root window */
+
+    parent = dmxScreen->scrnWin; /* This is our "Screen" window */
+    visual = dmxScreen->beVisuals[dmxScreen->beDefVisualIndex].visual;
+
+    dixLookupResourceByType((pointer*) &pCmap, wColormap(pWindow),
+			    RT_COLORMAP, NullClient, DixUnknownAccess);
+    pCmapPriv = DMX_GET_COLORMAP_PRIV(pCmap);
+
+    mask = CWEventMask | CWBackingStore | CWColormap | CWBorderPixel;
+    attribs.event_mask    = ExposureMask;
+    attribs.backing_store = NotUseful;
+    attribs.colormap      = pCmapPriv->cmap;
+    attribs.border_pixel  = 0;
+
+    /* Incorporate new attributes, if needed */
+    if (pWinPriv->attribMask) {
+	dmxDoChangeWindowAttributes(pWindow, &pWinPriv->attribMask, &attribs);
+	mask |= pWinPriv->attribMask;
+    }
+
+    return XCreateWindow(dmxScreen->beDisplay,
+			 parent,
+			 pWindow->origin.x - wBorderWidth(pWindow),
+			 pWindow->origin.y - wBorderWidth(pWindow),
+			 pWindow->drawable.width,
+			 pWindow->drawable.height,
+			 pWindow->borderWidth,
+			 pWindow->drawable.depth,
+			 pWindow->drawable.class,
+			 visual,
+			 mask,
+			 &attribs);
+}
+
+/** Change the location and size of the "screen" window.  Called from
+ *  dmxextension.c dmxConfigureScreenWindow(). */
+void dmxResizeScreenWindow(ScreenPtr pScreen,
+			   int x, int y, int w, int h)
+{
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    unsigned int    m;
+    XWindowChanges  c;
+
+    if (!dmxScreen->beDisplay)
+	return;
+
+    /* Handle resizing on back-end server */
+    m = CWX | CWY | CWWidth | CWHeight;
+    c.x = x;
+    c.y = y;
+    c.width = w;
+    c.height = h;
+
+    XConfigureWindow(dmxScreen->beDisplay, dmxScreen->scrnWin, m, &c);
+    dmxSync(dmxScreen, False);
+}
+
+/** Change the location and size of the "root" window.  Called from
+ *  #dmxCreateWindow. */
+void dmxResizeRootWindow(WindowPtr pRoot,
+			 int x, int y, int w, int h)
+{
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pRoot->drawable.pScreen->myNum];
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pRoot);
+    unsigned int    m;
+    XWindowChanges  c;
+
+    /* Handle resizing on back-end server */
+    if (dmxScreen->beDisplay) {
+	m = CWX | CWY | CWWidth | CWHeight;
+	c.x = x;
+	c.y = y;
+	c.width = (w > 0) ? w : 1;
+	c.height = (h > 0) ? h : 1;
+
+	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);
+    }
+
+    if (w == 0 || h == 0) {
+	if (pWinPriv->mapped) {
+	    if (dmxScreen->beDisplay)
+		XUnmapWindow(dmxScreen->beDisplay, pWinPriv->window);
+	    pWinPriv->mapped = FALSE;
+	}
+    } else if (!pWinPriv->mapped) {
+	if (dmxScreen->beDisplay)
+	    XMapWindow(dmxScreen->beDisplay, pWinPriv->window);
+	pWinPriv->mapped = TRUE;
+    }
+
+    if (dmxScreen->beDisplay)
+	dmxSync(dmxScreen, False);
+}
+
+void dmxGetDefaultWindowAttributes(WindowPtr pWindow,
+				   Colormap *cmap,
+				   Visual **visual)
+{
+    ScreenPtr  pScreen = pWindow->drawable.pScreen;
+
+    if (pWindow->drawable.class != InputOnly &&
+	pWindow->optional &&
+	pWindow->optional->visual != wVisual(pWindow->parent)) {
+
+	/* Find the matching visual */
+	*visual = dmxLookupVisualFromID(pScreen, wVisual(pWindow));
+
+	/* Handle optional colormaps */
+	if (pWindow->optional->colormap) {
+	    ColormapPtr         pCmap;
+	    dmxColormapPrivPtr  pCmapPriv;
+
+	    dixLookupResourceByType((pointer*) &pCmap, wColormap(pWindow),
+				    RT_COLORMAP, NullClient, DixUnknownAccess);
+	    pCmapPriv = DMX_GET_COLORMAP_PRIV(pCmap);
+	    *cmap = pCmapPriv->cmap;
+	} else {
+	    *cmap = dmxColormapFromDefaultVisual(pScreen, *visual);
+	}
+    } else {
+	*visual = CopyFromParent;
+	*cmap = (Colormap)0;
+    }
+}
+
+static Window dmxCreateNonRootWindow(WindowPtr pWindow)
+{
+    ScreenPtr             pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo        *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr         pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    Window                parent;
+    unsigned long         mask = 0L;
+    XSetWindowAttributes  attribs;
+    dmxWinPrivPtr         pParentPriv = DMX_GET_WINDOW_PRIV(pWindow->parent);
+
+    /* Create window on back-end server */
+
+    parent = pParentPriv->window;
+
+    /* The parent won't exist if this call to CreateNonRootWindow came
+       from ReparentWindow and the grandparent window has not yet been
+       created */
+    if (!parent) {
+	dmxCreateAndRealizeWindow(pWindow->parent, FALSE);
+	parent = pParentPriv->window;
+    }
+
+    /* Incorporate new attributes, if needed */
+    if (pWinPriv->attribMask) {
+	dmxDoChangeWindowAttributes(pWindow, &pWinPriv->attribMask, &attribs);
+	mask |= pWinPriv->attribMask;
+    }
+
+    /* Add in default attributes */
+    if (pWindow->drawable.class != InputOnly) {
+	mask |= CWBackingStore;
+	attribs.backing_store = NotUseful;
+
+	if (!(mask & CWColormap) && pWinPriv->cmap) {
+	    mask |= CWColormap;
+	    attribs.colormap = pWinPriv->cmap;
+	    if (!(mask & CWBorderPixel)) {
+		mask |= CWBorderPixel;
+		attribs.border_pixel = 0;
+	    }
+	}
+    }
+
+    /* Handle case where subwindows are being mapped, but created out of
+       order -- if current window has a previous sibling, then it cannot
+       be created on top of the stack, so we must restack the windows */
+    pWinPriv->restacked = (pWindow->prevSib != NullWindow);
+
+    return XCreateWindow(dmxScreen->beDisplay,
+			 parent,
+			 pWindow->origin.x - wBorderWidth(pWindow),
+			 pWindow->origin.y - wBorderWidth(pWindow),
+			 pWindow->drawable.width,
+			 pWindow->drawable.height,
+			 pWindow->borderWidth,
+			 pWindow->drawable.depth,
+			 pWindow->drawable.class,
+			 pWinPriv->visual,
+			 mask,
+			 &attribs);
+}
+
+/** This function handles lazy window creation and realization.  Window
+ *  creation is handled by #dmxCreateNonRootWindow().  It also handles
+ *  any stacking changes that have occured since the window was
+ *  originally created by calling #dmxDoRestackWindow().  If the window
+ *  is shaped, the shape is set on the back-end server by calling
+ *  #dmxDoSetShape(), and if the window has pictures (from RENDER)
+ *  associated with it, those pictures are created on the back-end
+ *  server by calling #dmxCreatePictureList().  If \a doSync is TRUE,
+ *  then #dmxSync() is called. */
+void dmxCreateAndRealizeWindow(WindowPtr pWindow, Bool doSync)
+{
+    ScreenPtr      pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+
+    if (!dmxScreen->beDisplay) return;
+
+    pWinPriv->window = dmxCreateNonRootWindow(pWindow);
+    if (pWinPriv->restacked) dmxDoRestackWindow(pWindow);
+    if (pWinPriv->isShaped) dmxDoSetShape(pWindow);
+    if (pWinPriv->hasPict) dmxCreatePictureList(pWindow);
+    if (pWinPriv->mapped) XMapWindow(dmxScreen->beDisplay,
+				      pWinPriv->window);
+    if (doSync) dmxSync(dmxScreen, False);
+}
+
+/** Create \a pWindow on the back-end server.  If the lazy window
+ *  creation optimization is enabled, then the actual creation and
+ *  realization of the window is handled by
+ *  #dmxCreateAndRealizeWindow(). */
+Bool dmxCreateWindow(WindowPtr pWindow)
+{
+    ScreenPtr             pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo        *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr         pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    Bool                  ret = TRUE;
+
+    DMX_UNWRAP(CreateWindow, dmxScreen, pScreen);
+#if 0
+    if (pScreen->CreateWindow)
+	ret = pScreen->CreateWindow(pWindow);
+#endif
+
+    /* Set up the defaults */
+    pWinPriv->window     = (Window)0;
+    pWinPriv->offscreen  = TRUE;
+    pWinPriv->mapped     = FALSE;
+    pWinPriv->restacked  = FALSE;
+    pWinPriv->attribMask = 0;
+    pWinPriv->isShaped   = FALSE;
+    pWinPriv->hasPict    = FALSE;
+#ifdef GLXEXT
+    pWinPriv->swapGroup  = NULL;
+    pWinPriv->barrier    = 0;
+#endif
+
+    if (dmxScreen->beDisplay) {
+	/* Only create the root window at this stage -- non-root windows are
+	   created when they are mapped and are on-screen */
+	if (!pWindow->parent) {
+	    dmxScreen->rootWin = pWinPriv->window
+		= dmxCreateRootWindow(pWindow);
+	    if (dmxScreen->scrnX         != dmxScreen->rootX
+		|| dmxScreen->scrnY      != dmxScreen->rootY
+		|| dmxScreen->scrnWidth  != dmxScreen->rootWidth
+		|| dmxScreen->scrnHeight != dmxScreen->rootHeight) {
+		dmxResizeRootWindow(pWindow,
+				    dmxScreen->rootX,
+				    dmxScreen->rootY,
+				    dmxScreen->rootWidth,
+				    dmxScreen->rootHeight);
+		dmxUpdateScreenResources(screenInfo.screens[dmxScreen->index],
+					 dmxScreen->rootX,
+					 dmxScreen->rootY,
+					 dmxScreen->rootWidth,
+					 dmxScreen->rootHeight);
+		pWindow->origin.x = dmxScreen->rootX;
+		pWindow->origin.y = dmxScreen->rootY;
+	    }
+	} else {
+	    dmxGetDefaultWindowAttributes(pWindow,
+					  &pWinPriv->cmap,
+					  &pWinPriv->visual);
+
+	    if (dmxLazyWindowCreation) {
+		/* Save parent's visual for use later */
+		if (pWinPriv->visual == CopyFromParent)
+		    pWinPriv->visual =
+			dmxLookupVisualFromID(pScreen,
+					      wVisual(pWindow->parent));
+	    } else {
+		pWinPriv->window = dmxCreateNonRootWindow(pWindow);
+	    }
+	}
+
+	dmxSync(dmxScreen, False);
+    }
+
+    DMX_WRAP(CreateWindow, dmxCreateWindow, dmxScreen, pScreen);
+
+    return ret;
+}
+
+/** Destroy \a pWindow on the back-end server. */
+Bool dmxBEDestroyWindow(WindowPtr pWindow)
+{
+    ScreenPtr      pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+
+    if (pWinPriv->window) {
+	XDestroyWindow(dmxScreen->beDisplay, pWinPriv->window);
+	pWinPriv->window = (Window)0;
+	return TRUE;
+    }
+
+    return FALSE;
+}
+
+/** Destroy \a pWindow on the back-end server.  If any RENDER pictures
+    were created, destroy them as well. */
+Bool dmxDestroyWindow(WindowPtr pWindow)
+{
+    ScreenPtr      pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    Bool           ret = TRUE;
+    Bool           needSync = FALSE;
+#ifdef GLXEXT
+    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+#endif
+
+    DMX_UNWRAP(DestroyWindow, dmxScreen, pScreen);
+
+    /* Destroy any picture list associated with this window */
+    needSync |= dmxDestroyPictureList(pWindow);
+
+    /* Destroy window on back-end server */
+    needSync |= dmxBEDestroyWindow(pWindow);
+    if (needSync) dmxSync(dmxScreen, FALSE);
+
+#ifdef GLXEXT
+    if (pWinPriv->swapGroup && pWinPriv->windowDestroyed)
+	pWinPriv->windowDestroyed(pWindow);
+#endif
+
+    if (pScreen->DestroyWindow)
+	ret = pScreen->DestroyWindow(pWindow);
+
+    DMX_WRAP(DestroyWindow, dmxDestroyWindow, dmxScreen, pScreen);
+
+    return ret;
+}
+
+/** Change the position of \a pWindow to be \a x, \a y. */
+Bool dmxPositionWindow(WindowPtr pWindow, int x, int y)
+{
+    ScreenPtr       pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    Bool            ret = TRUE;
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    unsigned int    m;
+    XWindowChanges  c;
+
+    DMX_UNWRAP(PositionWindow, dmxScreen, pScreen);
+#if 0
+    if (pScreen->PositionWindow)
+	ret = pScreen->PositionWindow(pWindow, x, y);
+#endif
+
+    /* Determine if the window is completely off the visible portion of
+       the screen */
+    pWinPriv->offscreen = DMX_WINDOW_OFFSCREEN(pWindow);
+
+    /* If the window is now on-screen and it is mapped and it has not
+       been created yet, create it and map it */
+    if (!pWinPriv->window && pWinPriv->mapped && !pWinPriv->offscreen) {
+	dmxCreateAndRealizeWindow(pWindow, TRUE);
+    } else if (pWinPriv->window) {
+	/* Position window on back-end server */
+	m = CWX | CWY | CWWidth | CWHeight;
+	c.x = pWindow->origin.x - wBorderWidth(pWindow);
+	c.y = pWindow->origin.y - wBorderWidth(pWindow);
+	c.width = pWindow->drawable.width;
+	c.height = pWindow->drawable.height;
+	if (pWindow->drawable.class != InputOnly) {
+	    m |= CWBorderWidth;
+	    c.border_width = pWindow->borderWidth;
+	}
+
+	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);
+	dmxSync(dmxScreen, False);
+    }
+
+    DMX_WRAP(PositionWindow, dmxPositionWindow, dmxScreen, pScreen);
+
+    return ret;
+}
+
+static void dmxDoChangeWindowAttributes(WindowPtr pWindow,
+					unsigned long *mask,
+					XSetWindowAttributes *attribs)
+{
+    dmxPixPrivPtr         pPixPriv;
+
+    if (*mask & CWBackPixmap) {
+	switch (pWindow->backgroundState) {
+	case None:
+	    attribs->background_pixmap = None;
+	    break;
+
+	case ParentRelative:
+	    attribs->background_pixmap = ParentRelative;
+	    break;
+
+	case BackgroundPixmap:
+	    pPixPriv = DMX_GET_PIXMAP_PRIV(pWindow->background.pixmap);
+	    attribs->background_pixmap = pPixPriv->pixmap;
+	    break;
+
+	case BackgroundPixel:
+	    *mask &= ~CWBackPixmap;
+	    break;
+	}
+    }
+
+    if (*mask & CWBackPixel) {
+	if (pWindow->backgroundState == BackgroundPixel)
+	    attribs->background_pixel = pWindow->background.pixel;
+	else
+	    *mask &= ~CWBackPixel;
+    }
+
+    if (*mask & CWBorderPixmap) {
+	if (pWindow->borderIsPixel)
+	    *mask &= ~CWBorderPixmap;
+	else {
+	    pPixPriv = DMX_GET_PIXMAP_PRIV(pWindow->border.pixmap);
+	    attribs->border_pixmap = pPixPriv->pixmap;
+	}
+    }
+
+    if (*mask & CWBorderPixel) {
+	if (pWindow->borderIsPixel)
+	    attribs->border_pixel = pWindow->border.pixel;
+	else
+	    *mask &= ~CWBorderPixel;
+    }
+
+    if (*mask & CWBitGravity)
+	attribs->bit_gravity = pWindow->bitGravity;
+
+    if (*mask & CWWinGravity)
+	*mask &= ~CWWinGravity; /* Handled by dix */
+
+    if (*mask & CWBackingStore)
+	*mask &= ~CWBackingStore; /* Backing store not supported */
+
+    if (*mask & CWBackingPlanes)
+	*mask &= ~CWBackingPlanes; /* Backing store not supported */
+
+    if (*mask & CWBackingPixel)
+	*mask &= ~CWBackingPixel; /* Backing store not supported */
+
+    if (*mask & CWOverrideRedirect)
+	attribs->override_redirect = pWindow->overrideRedirect;
+
+    if (*mask & CWSaveUnder)
+	*mask &= ~CWSaveUnder; /* Save unders not supported */
+
+    if (*mask & CWEventMask)
+	*mask &= ~CWEventMask; /* Events are handled by dix */
+
+    if (*mask & CWDontPropagate)
+	*mask &= ~CWDontPropagate; /* Events are handled by dix */
+
+    if (*mask & CWColormap) {
+	ColormapPtr         pCmap;
+	dmxColormapPrivPtr  pCmapPriv;
+
+	dixLookupResourceByType((pointer*) &pCmap, wColormap(pWindow),
+				RT_COLORMAP, NullClient, DixUnknownAccess);
+	pCmapPriv = DMX_GET_COLORMAP_PRIV(pCmap);
+	attribs->colormap = pCmapPriv->cmap;
+    }
+
+    if (*mask & CWCursor)
+	*mask &= ~CWCursor; /* Handled by the cursor code */
+}
+
+/** Change the window attributes of \a pWindow. */
+Bool dmxChangeWindowAttributes(WindowPtr pWindow, unsigned long mask)
+{
+    ScreenPtr             pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo        *dmxScreen = &dmxScreens[pScreen->myNum];
+    Bool                  ret = TRUE;
+    dmxWinPrivPtr         pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    XSetWindowAttributes  attribs;
+
+    DMX_UNWRAP(ChangeWindowAttributes, dmxScreen, pScreen);
+#if 0
+    if (pScreen->ChangeWindowAttributes)
+	ret = pScreen->ChangeWindowAttributes(pWindow, mask);
+#endif
+
+    /* Change window attribs on back-end server */
+    dmxDoChangeWindowAttributes(pWindow, &mask, &attribs);
+
+    /* Save mask for lazy window creation optimization */
+    pWinPriv->attribMask |= mask;
+
+    if (mask && pWinPriv->window) {
+	XChangeWindowAttributes(dmxScreen->beDisplay, pWinPriv->window,
+				mask, &attribs);
+	dmxSync(dmxScreen, False);
+    }
+
+    DMX_WRAP(ChangeWindowAttributes, dmxChangeWindowAttributes, dmxScreen,
+	     pScreen);
+
+    return ret;
+}
+
+/** Realize \a pWindow on the back-end server.  If the lazy window
+ *  creation optimization is enabled, the window is only realized when
+ *  it at least partially overlaps the screen. */
+Bool dmxRealizeWindow(WindowPtr pWindow)
+{
+    ScreenPtr      pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    Bool           ret = TRUE;
+    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+
+    DMX_UNWRAP(RealizeWindow, dmxScreen, pScreen);
+#if 0
+    if (pScreen->RealizeWindow)
+	ret = pScreen->RealizeWindow(pWindow);
+#endif
+
+    /* Determine if the window is completely off the visible portion of
+       the screen */
+    pWinPriv->offscreen = DMX_WINDOW_OFFSCREEN(pWindow);
+
+    /* If the window hasn't been created and it's not offscreen, then
+       create it */
+    if (!pWinPriv->window && !pWinPriv->offscreen) {
+	dmxCreateAndRealizeWindow(pWindow, FALSE);
+    }
+
+    if (pWinPriv->window) {
+	/* Realize window on back-end server */
+	XMapWindow(dmxScreen->beDisplay, pWinPriv->window);
+	dmxSync(dmxScreen, False);
+    }
+
+    /* Let the other functions know that the window is now mapped */
+    pWinPriv->mapped = TRUE;
+
+    DMX_WRAP(RealizeWindow, dmxRealizeWindow, dmxScreen, pScreen);
+
+    dmxUpdateWindowInfo(DMX_UPDATE_REALIZE, pWindow);
+    return ret;
+}
+
+/** Unrealize \a pWindow on the back-end server. */
+Bool dmxUnrealizeWindow(WindowPtr pWindow)
+{
+    ScreenPtr      pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    Bool           ret = TRUE;
+    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+
+    DMX_UNWRAP(UnrealizeWindow, dmxScreen, pScreen);
+#if 0
+    if (pScreen->UnrealizeWindow)
+	ret = pScreen->UnrealizeWindow(pWindow);
+#endif
+
+    if (pWinPriv->window) {
+	/* Unrealize window on back-end server */
+	XUnmapWindow(dmxScreen->beDisplay, pWinPriv->window);
+	dmxSync(dmxScreen, False);
+    }
+
+    /* When unrealized (i.e., unmapped), the window is always considered
+       off of the visible portion of the screen */
+    pWinPriv->offscreen = TRUE;
+    pWinPriv->mapped = FALSE;
+
+#ifdef GLXEXT
+    if (pWinPriv->swapGroup && pWinPriv->windowUnmapped)
+	pWinPriv->windowUnmapped(pWindow);
+#endif
+
+    DMX_WRAP(UnrealizeWindow, dmxUnrealizeWindow, dmxScreen, pScreen);
+
+    dmxUpdateWindowInfo(DMX_UPDATE_UNREALIZE, pWindow);
+    return ret;
+}
+
+static void dmxDoRestackWindow(WindowPtr pWindow)
+{
+    ScreenPtr       pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    WindowPtr       pNextSib = pWindow->nextSib;
+    unsigned int    m;
+    XWindowChanges  c;
+
+    if (pNextSib == NullWindow) {
+	/* Window is at the bottom of the stack */
+	m = CWStackMode;
+	c.sibling = (Window)0;
+	c.stack_mode = Below;
+	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);
+    } else {
+	/* Window is not at the bottom of the stack */
+	dmxWinPrivPtr  pNextSibPriv = DMX_GET_WINDOW_PRIV(pNextSib);
+
+	/* Handle case where siblings have not yet been created due to
+           lazy window creation optimization by first finding the next
+           sibling in the sibling list that has been created (if any)
+           and then putting the current window just above that sibling,
+           and if no next siblings have been created yet, then put it at
+           the bottom of the stack (since it might have a previous
+           sibling that should be above it). */
+	while (!pNextSibPriv->window) {
+	    pNextSib = pNextSib->nextSib;
+	    if (pNextSib == NullWindow) {
+		/* Window is at the bottom of the stack */
+		m = CWStackMode;
+		c.sibling = (Window)0;
+		c.stack_mode = Below;
+		XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);
+		return;
+	    }
+	    pNextSibPriv = DMX_GET_WINDOW_PRIV(pNextSib);
+	}
+
+	m = CWStackMode | CWSibling;
+	c.sibling = pNextSibPriv->window;
+	c.stack_mode = Above;
+	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);
+    }
+}
+
+/** Handle window restacking.  The actual restacking occurs in
+ *  #dmxDoRestackWindow(). */
+void dmxRestackWindow(WindowPtr pWindow, WindowPtr pOldNextSib)
+{
+    ScreenPtr       pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+
+    DMX_UNWRAP(RestackWindow, dmxScreen, pScreen);
+#if 0
+    if (pScreen->RestackWindow)
+	pScreen->RestackWindow(pWindow, pOldNextSib);
+#endif
+
+    if (pOldNextSib != pWindow->nextSib) {
+	/* Track restacking for lazy window creation optimization */
+	pWinPriv->restacked = TRUE;
+
+	/* Restack window on back-end server */
+	if (pWinPriv->window) {
+	    dmxDoRestackWindow(pWindow);
+	    dmxSync(dmxScreen, False);
+	}
+    }
+
+    DMX_WRAP(RestackWindow, dmxRestackWindow, dmxScreen, pScreen);
+    dmxUpdateWindowInfo(DMX_UPDATE_RESTACK, pWindow);
+}
+
+static Bool dmxWindowExposurePredicate(Display *dpy, XEvent *ev, XPointer ptr)
+{
+    return (ev->type == Expose && ev->xexpose.window == *(Window *)ptr);
+}
+
+/** Handle exposures on \a pWindow.  Since window exposures are handled
+ *  in DMX, the events that are generated by the back-end server are
+ *  redundant, so we eat them here. */
+void dmxWindowExposures(WindowPtr pWindow, RegionPtr prgn,
+			RegionPtr other_exposed)
+{
+    ScreenPtr      pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    XEvent         ev;
+
+    DMX_UNWRAP(WindowExposures, dmxScreen, pScreen);
+
+    dmxSync(dmxScreen, False);
+
+    if (pWinPriv->window) {
+	while (XCheckIfEvent(dmxScreen->beDisplay, &ev,
+			     dmxWindowExposurePredicate,
+			     (XPointer)&pWinPriv->window)) {
+	    /* Handle expose events -- this should not be necessary
+	       since the base window in which the root window was
+	       created is guaranteed to be on top (override_redirect),
+	       so we should just swallow these events.  If for some
+	       reason the window is not on top, then we'd need to
+	       collect these events and send them to the client later
+	       (e.g., during the block handler as Xnest does). */
+	}
+    }
+
+#if 1
+    if (pScreen->WindowExposures)
+	pScreen->WindowExposures(pWindow, prgn, other_exposed);
+#endif
+    DMX_WRAP(WindowExposures, dmxWindowExposures, dmxScreen, pScreen);
+}
+
+/** Move \a pWindow on the back-end server.  Determine whether or not it
+ *  is on or offscreen, and realize it if it is newly on screen and the
+ *  lazy window creation optimization is enabled. */
+void dmxCopyWindow(WindowPtr pWindow, DDXPointRec ptOldOrg, RegionPtr prgnSrc)
+{
+    ScreenPtr       pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    unsigned int    m;
+    XWindowChanges  c;
+
+    DMX_UNWRAP(CopyWindow, dmxScreen, pScreen);
+#if 0
+    if (pScreen->CopyWindow)
+	pScreen->CopyWindow(pWindow, ptOldOrg, prgnSrc);
+#endif
+
+    /* Determine if the window is completely off the visible portion of
+       the screen */
+    pWinPriv->offscreen = DMX_WINDOW_OFFSCREEN(pWindow);
+
+    /* If the window is now on-screen and it is mapped and it has not
+       been created yet, create it and map it */
+    if (!pWinPriv->window && pWinPriv->mapped && !pWinPriv->offscreen) {
+	dmxCreateAndRealizeWindow(pWindow, TRUE);
+    } else if (pWinPriv->window) {
+	/* Move window on back-end server */
+	m = CWX | CWY | CWWidth | CWHeight;
+	c.x = pWindow->origin.x - wBorderWidth(pWindow);
+	c.y = pWindow->origin.y - wBorderWidth(pWindow);
+	c.width = pWindow->drawable.width;
+	c.height = pWindow->drawable.height;
+
+	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);
+	dmxSync(dmxScreen, False);
+    }
+
+    DMX_WRAP(CopyWindow, dmxCopyWindow, dmxScreen, pScreen);
+    dmxUpdateWindowInfo(DMX_UPDATE_COPY, pWindow);
+}
+
+/** Resize \a pWindow on the back-end server.  Determine whether or not
+ *  it is on or offscreen, and realize it if it is newly on screen and
+ *  the lazy window creation optimization is enabled. */
+void dmxResizeWindow(WindowPtr pWindow, int x, int y,
+		     unsigned int w, unsigned int h, WindowPtr pSib)
+{
+    ScreenPtr       pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    dmxWinPrivPtr   pSibPriv;
+    unsigned int    m;
+    XWindowChanges  c;
+
+    if (pSib)
+	pSibPriv = DMX_GET_WINDOW_PRIV(pSib);
+
+    DMX_UNWRAP(ResizeWindow, dmxScreen, pScreen);
+#if 1
+    if (pScreen->ResizeWindow)
+	pScreen->ResizeWindow(pWindow, x, y, w, h, pSib);
+#endif
+
+    /* Determine if the window is completely off the visible portion of
+       the screen */
+    pWinPriv->offscreen = DMX_WINDOW_OFFSCREEN(pWindow);
+
+    /* If the window is now on-screen and it is mapped and it has not
+       been created yet, create it and map it */
+    if (!pWinPriv->window && pWinPriv->mapped && !pWinPriv->offscreen) {
+	dmxCreateAndRealizeWindow(pWindow, TRUE);
+    } else if (pWinPriv->window) {
+	/* Handle resizing on back-end server */
+	m = CWX | CWY | CWWidth | CWHeight;
+	c.x = pWindow->origin.x - wBorderWidth(pWindow);
+	c.y = pWindow->origin.y - wBorderWidth(pWindow);
+	c.width = pWindow->drawable.width;
+	c.height = pWindow->drawable.height;
+
+	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);
+	dmxSync(dmxScreen, False);
+    }
+
+    DMX_WRAP(ResizeWindow, dmxResizeWindow, dmxScreen, pScreen);
+    dmxUpdateWindowInfo(DMX_UPDATE_RESIZE, pWindow);
+}
+
+/** Reparent \a pWindow on the back-end server. */
+void dmxReparentWindow(WindowPtr pWindow, WindowPtr pPriorParent)
+{
+    ScreenPtr      pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr  pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    dmxWinPrivPtr  pParentPriv = DMX_GET_WINDOW_PRIV(pWindow->parent);
+
+    DMX_UNWRAP(ReparentWindow, dmxScreen, pScreen);
+#if 0
+    if (pScreen->ReparentWindow)
+	pScreen->ReparentWindow(pWindow, pPriorParent);
+#endif
+
+    if (pWinPriv->window) {
+	if (!pParentPriv->window) {
+	    dmxCreateAndRealizeWindow(pWindow->parent, FALSE);
+	}
+
+	/* Handle reparenting on back-end server */
+	XReparentWindow(dmxScreen->beDisplay, pWinPriv->window,
+			pParentPriv->window,
+			pWindow->origin.x - wBorderWidth(pWindow),
+			pWindow->origin.x - wBorderWidth(pWindow));
+	dmxSync(dmxScreen, False);
+    }
+
+    DMX_WRAP(ReparentWindow, dmxReparentWindow, dmxScreen, pScreen);
+    dmxUpdateWindowInfo(DMX_UPDATE_REPARENT, pWindow);
+}
+
+/** Change border width for \a pWindow to \a width pixels. */
+void dmxChangeBorderWidth(WindowPtr pWindow, unsigned int width)
+{
+    ScreenPtr       pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    unsigned int    m;
+    XWindowChanges  c;
+
+    DMX_UNWRAP(ChangeBorderWidth, dmxScreen, pScreen);
+#if 1
+    if (pScreen->ChangeBorderWidth)
+	pScreen->ChangeBorderWidth(pWindow, width);
+#endif
+
+    /* NOTE: Do we need to check for on/off screen here? */
+
+    if (pWinPriv->window) {
+	/* Handle border width change on back-end server */
+	m = CWBorderWidth;
+	c.border_width = width;
+
+	XConfigureWindow(dmxScreen->beDisplay, pWinPriv->window, m, &c);
+	dmxSync(dmxScreen, False);
+    }
+
+    DMX_WRAP(ChangeBorderWidth, dmxChangeBorderWidth, dmxScreen, pScreen);
+}
+
+static void dmxDoSetShape(WindowPtr pWindow)
+{
+    ScreenPtr       pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+    int             nBox;
+    BoxPtr          pBox;
+    int             nRect;
+    XRectangle     *pRect;
+    XRectangle     *pRectFirst;
+
+    /* First, set the bounding shape */
+    if (wBoundingShape(pWindow)) {
+	pBox = RegionRects(wBoundingShape(pWindow));
+	nRect = nBox = RegionNumRects(wBoundingShape(pWindow));
+	pRectFirst = pRect = malloc(nRect * sizeof(*pRect));
+	while (nBox--) {
+	    pRect->x      = pBox->x1;
+	    pRect->y      = pBox->y1;
+	    pRect->width  = pBox->x2 - pBox->x1;
+	    pRect->height = pBox->y2 - pBox->y1;
+	    pBox++;
+	    pRect++;
+	}
+	XShapeCombineRectangles(dmxScreen->beDisplay, pWinPriv->window,
+				ShapeBounding, 0, 0,
+				pRectFirst, nRect,
+				ShapeSet, YXBanded);
+	free(pRectFirst);
+    } else {
+	XShapeCombineMask(dmxScreen->beDisplay, pWinPriv->window,
+			  ShapeBounding, 0, 0, None, ShapeSet);
+    }
+
+    /* Next, set the clip shape */
+    if (wClipShape(pWindow)) {
+	pBox = RegionRects(wClipShape(pWindow));
+	nRect = nBox = RegionNumRects(wClipShape(pWindow));
+	pRectFirst = pRect = malloc(nRect * sizeof(*pRect));
+	while (nBox--) {
+	    pRect->x      = pBox->x1;
+	    pRect->y      = pBox->y1;
+	    pRect->width  = pBox->x2 - pBox->x1;
+	    pRect->height = pBox->y2 - pBox->y1;
+	    pBox++;
+	    pRect++;
+	}
+	XShapeCombineRectangles(dmxScreen->beDisplay, pWinPriv->window,
+				ShapeClip, 0, 0,
+				pRectFirst, nRect,
+				ShapeSet, YXBanded);
+	free(pRectFirst);
+    } else {
+	XShapeCombineMask(dmxScreen->beDisplay, pWinPriv->window,
+			  ShapeClip, 0, 0, None, ShapeSet);
+    }
+
+    if (XShapeInputSelected(dmxScreen->beDisplay, pWinPriv->window)) {
+	ErrorF("Input selected for window %x on Screen %d\n",
+	       (unsigned int)pWinPriv->window, pScreen->myNum);
+    }
+}
+
+/** Set shape of \a pWindow on the back-end server. */
+void dmxSetShape(WindowPtr pWindow, int kind)
+{
+    ScreenPtr       pScreen = pWindow->drawable.pScreen;
+    DMXScreenInfo  *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxWinPrivPtr   pWinPriv = DMX_GET_WINDOW_PRIV(pWindow);
+
+    DMX_UNWRAP(SetShape, dmxScreen, pScreen);
+#if 1
+    if (pScreen->SetShape)
+	pScreen->SetShape(pWindow, kind);
+#endif
+
+    if (pWinPriv->window) {
+	/* Handle setting the current shape on the back-end server */
+	dmxDoSetShape(pWindow);
+	dmxSync(dmxScreen, False);
+    } else {
+	pWinPriv->isShaped = TRUE;
+    }
+
+    DMX_WRAP(SetShape, dmxSetShape, dmxScreen, pScreen);
+}
diff --git a/xorg-server/hw/dmx/doc/Makefile.am b/xorg-server/hw/dmx/doc/Makefile.am
index d3acf23b7..0713884cd 100644
--- a/xorg-server/hw/dmx/doc/Makefile.am
+++ b/xorg-server/hw/dmx/doc/Makefile.am
@@ -1,277 +1,34 @@
-#  Copyright 2005 Red Hat, Inc.

-#

-#  Permission to use, copy, modify, distribute, and sell this software

-#  and its documentation for any purpose is hereby granted without

-#  fee, provided that the above copyright notice appear in all copies

-#  and that both that copyright notice and this permission notice

-#  appear in supporting documentation, and that the name of Red Hat

-#  not be used in advertising or publicity pertaining to distribution

-#  of the software without specific, written prior permission.  Red

-#  Hat makes no representations about the suitability of this software

-#  for any purpose.  It is provided "as is" without express or implied

-#  warranty.

-#

-#  RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

-#  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN

-#  NO EVENT SHALL RED HAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR

-#  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS

-#  OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,

-#  NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

-#  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

-

-doc_sources = dmx.xml scaled.xml

-

-# Developer's documentation is not installed

-if ENABLE_DEVEL_DOCS

-include $(top_srcdir)/doc/xml/xmlrules-noinst.in

-endif ENABLE_DEVEL_DOCS

-

-DOXYGEN_HEAD=\

-	html/annotated.html

-

-DOXYGEN_REST= \

-	html/ChkNotMaskEv_8c.html \

-	html/ChkNotMaskEv_8h.html \

-	html/ChkNotMaskEv_8h_source.html \

-	html/classes.html \

-	html/dmx_8h.html \

-	html/dmx_8h_source.html \

-	html/dmxarg_8c.html \

-	html/dmxarg_8h.html \

-	html/dmxarg_8h_source.html \

-	html/dmxbackend_8c.html \

-	html/dmxbackend_8h.html \

-	html/dmxbackend_8h_source.html \

-	html/dmxcb_8c.html \

-	html/dmxcb_8h.html \

-	html/dmxcb_8h_source.html \

-	html/dmxclient_8h.html \

-	html/dmxclient_8h_source.html \

-	html/dmxcmap_8c.html \

-	html/dmxcmap_8h.html \

-	html/dmxcmap_8h_source.html \

-	html/dmxcommon_8c.html \

-	html/dmxcommon_8h.html \

-	html/dmxcommon_8h_source.html \

-	html/dmxcompat_8c.html \

-	html/dmxcompat_8h.html \

-	html/dmxcompat_8h_source.html \

-	html/dmxconfig_8c.html \

-	html/dmxconfig_8h.html \

-	html/dmxconfig_8h_source.html \

-	html/dmxconsole_8c.html \

-	html/dmxconsole_8h.html \

-	html/dmxconsole_8h_source.html \

-	html/dmxcursor_8c.html \

-	html/dmxcursor_8h.html \

-	html/dmxcursor_8h_source.html \

-	html/dmxdetach_8c.html \

-	html/dmxdpms_8c.html \

-	html/dmxdpms_8h.html \

-	html/dmxdpms_8h_source.html \

-	html/dmxdummy_8c.html \

-	html/dmxdummy_8h.html \

-	html/dmxdummy_8h_source.html \

-	html/dmxevents_8c.html \

-	html/dmxevents_8h.html \

-	html/dmxevents_8h_source.html \

-	html/dmxextension_8c.html \

-	html/dmxextension_8h.html \

-	html/dmxextension_8h_source.html \

-	html/dmxfont_8c.html \

-	html/dmxfont_8h.html \

-	html/dmxfont_8h_source.html \

-	html/dmxgc_8c.html \

-	html/dmxgc_8h.html \

-	html/dmxgc_8h_source.html \

-	html/dmxgcops_8c.html \

-	html/dmxgcops_8h.html \

-	html/dmxgcops_8h_source.html \

-	html/dmx__glxvisuals_8h_source.html \

-	html/dmxinit_8c.html \

-	html/dmxinit_8h.html \

-	html/dmxinit_8h_source.html \

-	html/dmxinput_8c.html \

-	html/dmxinput_8h.html \

-	html/dmxinput_8h_source.html \

-	html/dmxinputinit_8c.html \

-	html/dmxinputinit_8h.html \

-	html/dmxinputinit_8h_source.html \

-	html/dmxlog_8c.html \

-	html/dmxlog_8h.html \

-	html/dmxlog_8h_source.html \

-	html/dmxmap_8c.html \

-	html/dmxmap_8h.html \

-	html/dmxmap_8h_source.html \

-	html/dmxmotion_8c.html \

-	html/dmxmotion_8h.html \

-	html/dmxmotion_8h_source.html \

-	html/dmxparse_8c.html \

-	html/dmxparse_8h.html \

-	html/dmxparse_8h_source.html \

-	html/dmxpict_8c.html \

-	html/dmxpict_8h.html \

-	html/dmxpict_8h_source.html \

-	html/dmxpixmap_8c.html \

-	html/dmxpixmap_8h.html \

-	html/dmxpixmap_8h_source.html \

-	html/dmxprint_8c.html \

-	html/dmxprint_8h.html \

-	html/dmxprint_8h_source.html \

-	html/dmxprop_8c.html \

-	html/dmxprop_8h.html \

-	html/dmxprop_8h_source.html \

-	html/dmxscrinit_8c.html \

-	html/dmxscrinit_8h.html \

-	html/dmxscrinit_8h_source.html \

-	html/dmxshadow_8c.html \

-	html/dmxshadow_8h.html \

-	html/dmxshadow_8h_source.html \

-	html/dmxsigio_8c.html \

-	html/dmxsigio_8h.html \

-	html/dmxsigio_8h_source.html \

-	html/dmxstat_8c.html \

-	html/dmxstat_8h.html \

-	html/dmxstat_8h_source.html \

-	html/dmxsync_8c.html \

-	html/dmxsync_8h.html \

-	html/dmxsync_8h_source.html \

-	html/dmxvisual_8c.html \

-	html/dmxvisual_8h.html \

-	html/dmxvisual_8h_source.html \

-	html/dmxwindow_8c.html \

-	html/dmxwindow_8h.html \

-	html/dmxwindow_8h_source.html \

-	html/dmxxinput_8c.html \

-	html/doxygen.css \

-	html/doxygen.png \

-	html/files.html \

-	html/ftv2blank.png \

-	html/ftv2doc.png \

-	html/ftv2folderclosed.png \

-	html/ftv2folderopen.png \

-	html/ftv2lastnode.png \

-	html/ftv2link.png \

-	html/ftv2mlastnode.png \

-	html/ftv2mnode.png \

-	html/ftv2node.png \

-	html/ftv2plastnode.png \

-	html/ftv2pnode.png \

-	html/ftv2vertline.png \

-	html/functions.html \

-	html/functions_vars.html \

-	html/globals_defs.html \

-	html/globals_enum.html \

-	html/globals_eval.html \

-	html/globals_func.html \

-	html/globals.html \

-	html/globals_type.html \

-	html/globals_vars.html \

-	html/index.html \

-	html/lnx-keyboard_8c.html \

-	html/lnx-keyboard_8h.html \

-	html/lnx-keyboard_8h_source.html \

-	html/lnx-ms_8c.html \

-	html/lnx-ms_8h.html \

-	html/lnx-ms_8h_source.html \

-	html/lnx-ps2_8c.html \

-	html/lnx-ps2_8h.html \

-	html/lnx-ps2_8h_source.html \

-	html/main.html \

-	html/struct__dmxArg.html \

-	html/struct__dmxColormapPriv.html \

-	html/structDMXConfigCmdStruct.html \

-	html/struct__DMXConfigComment.html \

-	html/struct__DMXConfigDisplay.html \

-	html/struct__DMXConfigEntry.html \

-	html/struct__DMXConfigFullDim.html \

-	html/structDMXConfigListStruct.html \

-	html/struct__DMXConfigNumber.html \

-	html/struct__DMXConfigOption.html \

-	html/struct__DMXConfigPair.html \

-	html/struct__DMXConfigParam.html \

-	html/struct__DMXConfigPartDim.html \

-	html/struct__DMXConfigString.html \

-	html/struct__DMXConfigSub.html \

-	html/struct__DMXConfigToken.html \

-	html/struct__DMXConfigVirtual.html \

-	html/struct__DMXConfigWall.html \

-	html/struct__dmxCursorPriv.html \

-	html/structDMXDesktopAttributesRec.html \

-	html/struct__DMXEventMap.html \

-	html/struct__dmxFontPriv.html \

-	html/struct__dmxGCPriv.html \

-	html/structdmxGlxVisualPrivate.html \

-	html/struct__dmxGlyphPriv.html \

-	html/structDMXInputAttributesRec.html \

-	html/struct__DMXInputInfo.html \

-	html/struct__DMXLocalInitInfo.html \

-	html/struct__DMXLocalInputInfo.html \

-	html/struct__dmxPictPriv.html \

-	html/struct__dmxPixPriv.html \

-	html/structDMXScreenAttributesRec.html \

-	html/struct__DMXScreenInfo.html \

-	html/struct__DMXStatAvg.html \

-	html/struct__DMXStatInfo.html \

-	html/structDMXWindowAttributesRec.html \

-	html/struct__dmxWinPriv.html \

-	html/struct__myPrivate.html \

-	html/tree.html \

-	html/usb-common_8c.html \

-	html/usb-common_8h.html \

-	html/usb-common_8h_source.html \

-	html/usb-keyboard_8c.html \

-	html/usb-keyboard_8h.html \

-	html/usb-keyboard_8h_source.html \

-	html/usb-mouse_8c.html \

-	html/usb-mouse_8h.html \

-	html/usb-mouse_8h_source.html \

-	html/usb-other_8c.html \

-	html/usb-other_8h.html \

-	html/usb-other_8h_source.html \

-	html/usb-private_8h.html \

-	html/usb-private_8h_source.html

-

-DOXYGEN_FILES=$(DOXYGEN_HEAD) $(DOXYGEN_REST)

-

-EXTRA_DIST = \

-	DMXSpec.txt \

-	DMXSpec-v1.txt \

-	doxygen.conf \

-	doxygen.css \

-	doxygen.foot \

-	doxygen.head \

-	$(DOXYGEN_FILES)

-

-if ENABLE_DEVEL_DOCS

-if HAVE_DOXYGEN

-

-DOXYGEN_SRC=doxygen.head doxygen.foot doxygen.css doxygen.conf

-

-all-local: $(DOXYGEN_FILES)

-

-dist-local: $(DOXYGEN_FILES)

-

-$(DOXYGEN_HEAD): $(DOXYGEN_SRC)

-	$(DOXYGEN) doxygen.conf

-

-$(DOXYGEN_REST): $(DOXYGEN_HEAD)

-

-maintainer-clean-local:

-	rm -rf html/

-

-distclean-local:

-	rm -rf html/

-

-endif HAVE_DOXYGEN

-endif ENABLE_DEVEL_DOCS

-

-$(builddir)/doxygen.head:

-	$(LN_S) $(srcdir)/doxygen.head $@

-

-$(builddir)/doxygen.foot:

-	$(LN_S) $(srcdir)/doxygen.foot $@

-

-$(builddir)doxygen.css:

-	$(LN_S) $(srcdir)/doxygen.css $@

-

+#  Copyright 2005 Red Hat, Inc.
+#
+#  Permission to use, copy, modify, distribute, and sell this software
+#  and its documentation for any purpose is hereby granted without
+#  fee, provided that the above copyright notice appear in all copies
+#  and that both that copyright notice and this permission notice
+#  appear in supporting documentation, and that the name of Red Hat
+#  not be used in advertising or publicity pertaining to distribution
+#  of the software without specific, written prior permission.  Red
+#  Hat makes no representations about the suitability of this software
+#  for any purpose.  It is provided "as is" without express or implied
+#  warranty.
+#
+#  RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+#  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
+#  NO EVENT SHALL RED HAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+#  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+#  OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+#  NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+#  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+if ENABLE_DEVEL_DOCS
+if HAVE_XMLTO
+
+# Main DocBook/XML files (DOCTYPE book)
+docbook = dmx.xml scaled.xml
+
+# Generate DocBook/XML output formats with or without stylesheets
+include $(top_srcdir)/devbook.am
+
+endif HAVE_XMLTO
+endif ENABLE_DEVEL_DOCS
+
+EXTRA_DIST = DMXSpec.txt DMXSpec-v1.txt
diff --git a/xorg-server/hw/dmx/doc/doxygen.conf.in b/xorg-server/hw/dmx/doc/doxygen.conf.in
deleted file mode 100644
index f886a436f..000000000
--- a/xorg-server/hw/dmx/doc/doxygen.conf.in
+++ /dev/null
@@ -1,1053 +0,0 @@
-# Doxyfile 1.3.4
-
-# This file describes the settings to be used by the documentation system
-# doxygen (www.doxygen.org) for a project
-#
-# All text after a hash (#) is considered a comment and will be ignored
-# The format is:
-#       TAG = value [value, ...]
-# For lists items can also be appended using:
-#       TAG += value [value, ...]
-# Values that contain spaces should be placed between quotes (" ")
-
-#---------------------------------------------------------------------------
-# Project related configuration options
-#---------------------------------------------------------------------------
-
-# The PROJECT_NAME tag is a single word (or a sequence of words surrounded 
-# by quotes) that should identify the project.
-
-PROJECT_NAME           = "Distributed Multihead X"
-
-# The PROJECT_NUMBER tag can be used to enter a project or revision number. 
-# This could be handy for archiving the generated documentation or 
-# if some version control system is used.
-
-PROJECT_NUMBER         = "dmx-1-2-20040604 and later"
-
-# The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
-# base path where the generated documentation will be put. 
-# If a relative path is entered, it will be relative to the location 
-# where doxygen was started. If left blank the current directory will be used.
-
-OUTPUT_DIRECTORY       = 
-
-# The OUTPUT_LANGUAGE tag is used to specify the language in which all 
-# documentation generated by doxygen is written. Doxygen will use this 
-# information to generate all constant output in the proper language. 
-# The default language is English, other supported languages are: 
-# Brazilian, Catalan, Chinese, Chinese-Traditional, Croatian, Czech, Danish, Dutch, 
-# Finnish, French, German, Greek, Hungarian, Italian, Japanese, Japanese-en 
-# (Japanese with English messages), Korean, Norwegian, Polish, Portuguese, 
-# Romanian, Russian, Serbian, Slovak, Slovene, Spanish, Swedish, and Ukrainian.
-
-OUTPUT_LANGUAGE        = English
-
-# If the BRIEF_MEMBER_DESC tag is set to YES (the default) Doxygen will 
-# include brief member descriptions after the members that are listed in 
-# the file and class documentation (similar to JavaDoc). 
-# Set to NO to disable this.
-
-BRIEF_MEMBER_DESC      = YES
-
-# If the REPEAT_BRIEF tag is set to YES (the default) Doxygen will prepend 
-# the brief description of a member or function before the detailed description. 
-# Note: if both HIDE_UNDOC_MEMBERS and BRIEF_MEMBER_DESC are set to NO, the 
-# brief descriptions will be completely suppressed.
-
-REPEAT_BRIEF           = YES
-
-# If the ALWAYS_DETAILED_SEC and REPEAT_BRIEF tags are both set to YES then 
-# Doxygen will generate a detailed section even if there is only a brief 
-# description.
-
-ALWAYS_DETAILED_SEC    = YES
-
-# If the INLINE_INHERITED_MEMB tag is set to YES, doxygen will show all inherited 
-# members of a class in the documentation of that class as if those members were 
-# ordinary class members. Constructors, destructors and assignment operators of 
-# the base classes will not be shown.
-
-INLINE_INHERITED_MEMB  = NO
-
-# If the FULL_PATH_NAMES tag is set to YES then Doxygen will prepend the full 
-# path before files name in the file list and in the header files. If set 
-# to NO the shortest path that makes the file name unique will be used.
-
-FULL_PATH_NAMES        = NO
-
-# If the FULL_PATH_NAMES tag is set to YES then the STRIP_FROM_PATH tag 
-# can be used to strip a user-defined part of the path. Stripping is 
-# only done if one of the specified strings matches the left-hand part of 
-# the path. It is allowed to use relative paths in the argument list.
-
-STRIP_FROM_PATH        = 
-
-# If the SHORT_NAMES tag is set to YES, doxygen will generate much shorter 
-# (but less readable) file names. This can be useful is your file systems 
-# doesn't support long names like on DOS, Mac, or CD-ROM.
-
-SHORT_NAMES            = NO
-
-# If the JAVADOC_AUTOBRIEF tag is set to YES then Doxygen 
-# will interpret the first line (until the first dot) of a JavaDoc-style 
-# comment as the brief description. If set to NO, the JavaDoc 
-# comments will behave just like the Qt-style comments (thus requiring an 
-# explict @brief command for a brief description.
-
-JAVADOC_AUTOBRIEF      = NO
-
-# The MULTILINE_CPP_IS_BRIEF tag can be set to YES to make Doxygen 
-# treat a multi-line C++ special comment block (i.e. a block of //! or /// 
-# comments) as a brief description. This used to be the default behaviour. 
-# The new default is to treat a multi-line C++ comment block as a detailed 
-# description. Set this tag to YES if you prefer the old behaviour instead.
-
-MULTILINE_CPP_IS_BRIEF = NO
-
-# If the INHERIT_DOCS tag is set to YES (the default) then an undocumented 
-# member inherits the documentation from any documented member that it 
-# reimplements.
-
-INHERIT_DOCS           = YES
-
-# If member grouping is used in the documentation and the DISTRIBUTE_GROUP_DOC 
-# tag is set to YES, then doxygen will reuse the documentation of the first 
-# member in the group (if any) for the other members of the group. By default 
-# all members of a group must be documented explicitly.
-
-DISTRIBUTE_GROUP_DOC   = NO
-
-# The TAB_SIZE tag can be used to set the number of spaces in a tab. 
-# Doxygen uses this value to replace tabs by spaces in code fragments.
-
-TAB_SIZE               = 8
-
-# This tag can be used to specify a number of aliases that acts 
-# as commands in the documentation. An alias has the form "name=value". 
-# For example adding "sideeffect=\par Side Effects:\n" will allow you to 
-# put the command \sideeffect (or @sideeffect) in the documentation, which 
-# will result in a user-defined paragraph with heading "Side Effects:". 
-# You can put \n's in the value part of an alias to insert newlines.
-
-ALIASES                = 
-
-# Set the OPTIMIZE_OUTPUT_FOR_C tag to YES if your project consists of C sources 
-# only. Doxygen will then generate output that is more tailored for C. 
-# For instance, some of the names that are used will be different. The list 
-# of all members will be omitted, etc.
-
-OPTIMIZE_OUTPUT_FOR_C  = YES
-
-# Set the OPTIMIZE_OUTPUT_JAVA tag to YES if your project consists of Java sources 
-# only. Doxygen will then generate output that is more tailored for Java. 
-# For instance, namespaces will be presented as packages, qualified scopes 
-# will look different, etc.
-
-OPTIMIZE_OUTPUT_JAVA   = NO
-
-# Set the SUBGROUPING tag to YES (the default) to allow class member groups of 
-# the same type (for instance a group of public functions) to be put as a 
-# subgroup of that type (e.g. under the Public Functions section). Set it to 
-# NO to prevent subgrouping. Alternatively, this can be done per class using 
-# the \nosubgrouping command.
-
-SUBGROUPING            = YES
-
-#---------------------------------------------------------------------------
-# Build related configuration options
-#---------------------------------------------------------------------------
-
-# If the EXTRACT_ALL tag is set to YES doxygen will assume all entities in 
-# documentation are documented, even if no documentation was available. 
-# Private class members and static file members will be hidden unless 
-# the EXTRACT_PRIVATE and EXTRACT_STATIC tags are set to YES
-
-EXTRACT_ALL            = YES
-
-# If the EXTRACT_PRIVATE tag is set to YES all private members of a class 
-# will be included in the documentation.
-
-EXTRACT_PRIVATE        = NO
-
-# If the EXTRACT_STATIC tag is set to YES all static members of a file 
-# will be included in the documentation.
-
-EXTRACT_STATIC         = YES
-
-# If the EXTRACT_LOCAL_CLASSES tag is set to YES classes (and structs) 
-# defined locally in source files will be included in the documentation. 
-# If set to NO only classes defined in header files are included.
-
-EXTRACT_LOCAL_CLASSES  = YES
-
-# If the HIDE_UNDOC_MEMBERS tag is set to YES, Doxygen will hide all 
-# undocumented members of documented classes, files or namespaces. 
-# If set to NO (the default) these members will be included in the 
-# various overviews, but no documentation section is generated. 
-# This option has no effect if EXTRACT_ALL is enabled.
-
-HIDE_UNDOC_MEMBERS     = YES
-
-# If the HIDE_UNDOC_CLASSES tag is set to YES, Doxygen will hide all 
-# undocumented classes that are normally visible in the class hierarchy. 
-# If set to NO (the default) these classes will be included in the various 
-# overviews. This option has no effect if EXTRACT_ALL is enabled.
-
-HIDE_UNDOC_CLASSES     = NO
-
-# If the HIDE_FRIEND_COMPOUNDS tag is set to YES, Doxygen will hide all 
-# friend (class|struct|union) declarations. 
-# If set to NO (the default) these declarations will be included in the 
-# documentation.
-
-HIDE_FRIEND_COMPOUNDS  = NO
-
-# If the HIDE_IN_BODY_DOCS tag is set to YES, Doxygen will hide any 
-# documentation blocks found inside the body of a function. 
-# If set to NO (the default) these blocks will be appended to the 
-# function's detailed documentation block.
-
-HIDE_IN_BODY_DOCS      = NO
-
-# The INTERNAL_DOCS tag determines if documentation 
-# that is typed after a \internal command is included. If the tag is set 
-# to NO (the default) then the documentation will be excluded. 
-# Set it to YES to include the internal documentation.
-
-INTERNAL_DOCS          = NO
-
-# If the CASE_SENSE_NAMES tag is set to NO then Doxygen will only generate 
-# file names in lower-case letters. If set to YES upper-case letters are also 
-# allowed. This is useful if you have classes or files whose names only differ 
-# in case and if your file system supports case sensitive file names. Windows 
-# users are advised to set this option to NO.
-
-CASE_SENSE_NAMES       = YES
-
-# If the HIDE_SCOPE_NAMES tag is set to NO (the default) then Doxygen 
-# will show members with their full class and namespace scopes in the 
-# documentation. If set to YES the scope will be hidden.
-
-HIDE_SCOPE_NAMES       = NO
-
-# If the SHOW_INCLUDE_FILES tag is set to YES (the default) then Doxygen 
-# will put a list of the files that are included by a file in the documentation 
-# of that file.
-
-SHOW_INCLUDE_FILES     = YES
-
-# If the INLINE_INFO tag is set to YES (the default) then a tag [inline] 
-# is inserted in the documentation for inline members.
-
-INLINE_INFO            = YES
-
-# If the SORT_MEMBER_DOCS tag is set to YES (the default) then doxygen 
-# will sort the (detailed) documentation of file and class members 
-# alphabetically by member name. If set to NO the members will appear in 
-# declaration order.
-
-SORT_MEMBER_DOCS       = YES
-
-# The GENERATE_TODOLIST tag can be used to enable (YES) or 
-# disable (NO) the todo list. This list is created by putting \todo 
-# commands in the documentation.
-
-GENERATE_TODOLIST      = YES
-
-# The GENERATE_TESTLIST tag can be used to enable (YES) or 
-# disable (NO) the test list. This list is created by putting \test 
-# commands in the documentation.
-
-GENERATE_TESTLIST      = YES
-
-# The GENERATE_BUGLIST tag can be used to enable (YES) or 
-# disable (NO) the bug list. This list is created by putting \bug 
-# commands in the documentation.
-
-GENERATE_BUGLIST       = YES
-
-# The GENERATE_DEPRECATEDLIST tag can be used to enable (YES) or 
-# disable (NO) the deprecated list. This list is created by putting 
-# \deprecated commands in the documentation.
-
-GENERATE_DEPRECATEDLIST= YES
-
-# The ENABLED_SECTIONS tag can be used to enable conditional 
-# documentation sections, marked by \if sectionname ... \endif.
-
-ENABLED_SECTIONS       = 
-
-# The MAX_INITIALIZER_LINES tag determines the maximum number of lines 
-# the initial value of a variable or define consists of for it to appear in 
-# the documentation. If the initializer consists of more lines than specified 
-# here it will be hidden. Use a value of 0 to hide initializers completely. 
-# The appearance of the initializer of individual variables and defines in the 
-# documentation can be controlled using \showinitializer or \hideinitializer 
-# command in the documentation regardless of this setting.
-
-MAX_INITIALIZER_LINES  = 30
-
-# Set the SHOW_USED_FILES tag to NO to disable the list of files generated 
-# at the bottom of the documentation of classes and structs. If set to YES the 
-# list will mention the files that were used to generate the documentation.
-
-SHOW_USED_FILES        = YES
-
-#---------------------------------------------------------------------------
-# configuration options related to warning and progress messages
-#---------------------------------------------------------------------------
-
-# The QUIET tag can be used to turn on/off the messages that are generated 
-# by doxygen. Possible values are YES and NO. If left blank NO is used.
-
-QUIET                  = YES
-
-# The WARNINGS tag can be used to turn on/off the warning messages that are 
-# generated by doxygen. Possible values are YES and NO. If left blank 
-# NO is used.
-
-WARNINGS               = YES
-
-# If WARN_IF_UNDOCUMENTED is set to YES, then doxygen will generate warnings 
-# for undocumented members. If EXTRACT_ALL is set to YES then this flag will 
-# automatically be disabled.
-
-WARN_IF_UNDOCUMENTED   = YES
-
-# If WARN_IF_DOC_ERROR is set to YES, doxygen will generate warnings for 
-# potential errors in the documentation, such as not documenting some 
-# parameters in a documented function, or documenting parameters that 
-# don't exist or using markup commands wrongly.
-
-WARN_IF_DOC_ERROR      = YES
-
-# The WARN_FORMAT tag determines the format of the warning messages that 
-# doxygen can produce. The string should contain the $file, $line, and $text 
-# tags, which will be replaced by the file and line number from which the 
-# warning originated and the warning text.
-
-WARN_FORMAT            = "$file:$line: $text"
-
-# The WARN_LOGFILE tag can be used to specify a file to which warning 
-# and error messages should be written. If left blank the output is written 
-# to stderr.
-
-WARN_LOGFILE           = 
-
-#---------------------------------------------------------------------------
-# configuration options related to the input files
-#---------------------------------------------------------------------------
-
-# The INPUT tag can be used to specify the files and/or directories that contain 
-# documented source files. You may enter file names like "myfile.cpp" or 
-# directories like "/usr/src/myproject". Separate the files or directories 
-# with spaces.
-
-INPUT                  = @srcdir@/.. \
-                         @srcdir@/../input \
-                         @srcdir@/../config
-
-# If the value of the INPUT tag contains directories, you can use the 
-# FILE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp 
-# and *.h) to filter out the source-files in the directories. If left 
-# blank the following patterns are tested: 
-# *.c *.cc *.cxx *.cpp *.c++ *.java *.ii *.ixx *.ipp *.i++ *.inl *.h *.hh *.hxx *.hpp 
-# *.h++ *.idl *.odl *.cs *.php *.php3 *.inc
-
-FILE_PATTERNS          = 
-
-# The RECURSIVE tag can be used to turn specify whether or not subdirectories 
-# should be searched for input files as well. Possible values are YES and NO. 
-# If left blank NO is used.
-
-RECURSIVE              = NO
-
-# The EXCLUDE tag can be used to specify files and/or directories that should 
-# excluded from the INPUT source files. This way you can easily exclude a 
-# subdirectory from a directory tree whose root is specified with the INPUT tag.
-
-EXCLUDE                = @srcdir@/../config/parser.c \
-                         @srcdir@/../config/parser.h \
-                         @srcdir@/../config/scanner.c
-
-# The EXCLUDE_SYMLINKS tag can be used select whether or not files or directories 
-# that are symbolic links (a Unix filesystem feature) are excluded from the input.
-
-EXCLUDE_SYMLINKS       = YES
-
-# If the value of the INPUT tag contains directories, you can use the 
-# EXCLUDE_PATTERNS tag to specify one or more wildcard patterns to exclude 
-# certain files from those directories.
-
-EXCLUDE_PATTERNS       = atKeynames.h \
-                         Canvas*.*
-
-# The EXAMPLE_PATH tag can be used to specify one or more files or 
-# directories that contain example code fragments that are included (see 
-# the \include command).
-
-EXAMPLE_PATH           = 
-
-# If the value of the EXAMPLE_PATH tag contains directories, you can use the 
-# EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp 
-# and *.h) to filter out the source-files in the directories. If left 
-# blank all files are included.
-
-EXAMPLE_PATTERNS       = 
-
-# If the EXAMPLE_RECURSIVE tag is set to YES then subdirectories will be 
-# searched for input files to be used with the \include or \dontinclude 
-# commands irrespective of the value of the RECURSIVE tag. 
-# Possible values are YES and NO. If left blank NO is used.
-
-EXAMPLE_RECURSIVE      = NO
-
-# The IMAGE_PATH tag can be used to specify one or more files or 
-# directories that contain image that are included in the documentation (see 
-# the \image command).
-
-IMAGE_PATH             = 
-
-# The INPUT_FILTER tag can be used to specify a program that doxygen should 
-# invoke to filter for each input file. Doxygen will invoke the filter program 
-# by executing (via popen()) the command <filter> <input-file>, where <filter> 
-# is the value of the INPUT_FILTER tag, and <input-file> is the name of an 
-# input file. Doxygen will then use the output that the filter program writes 
-# to standard output.
-
-INPUT_FILTER           = 
-
-# If the FILTER_SOURCE_FILES tag is set to YES, the input filter (if set using 
-# INPUT_FILTER) will be used to filter the input files when producing source 
-# files to browse (i.e. when SOURCE_BROWSER is set to YES).
-
-FILTER_SOURCE_FILES    = NO
-
-#---------------------------------------------------------------------------
-# configuration options related to source browsing
-#---------------------------------------------------------------------------
-
-# If the SOURCE_BROWSER tag is set to YES then a list of source files will 
-# be generated. Documented entities will be cross-referenced with these sources.
-
-SOURCE_BROWSER         = NO
-
-# Setting the INLINE_SOURCES tag to YES will include the body 
-# of functions and classes directly in the documentation.
-
-INLINE_SOURCES         = NO
-
-# Setting the STRIP_CODE_COMMENTS tag to YES (the default) will instruct 
-# doxygen to hide any special comment blocks from generated source code 
-# fragments. Normal C and C++ comments will always remain visible.
-
-STRIP_CODE_COMMENTS    = YES
-
-# If the REFERENCED_BY_RELATION tag is set to YES (the default) 
-# then for each documented function all documented 
-# functions referencing it will be listed.
-
-REFERENCED_BY_RELATION = YES
-
-# If the REFERENCES_RELATION tag is set to YES (the default) 
-# then for each documented function all documented entities 
-# called/used by that function will be listed.
-
-REFERENCES_RELATION    = YES
-
-# If the VERBATIM_HEADERS tag is set to YES (the default) then Doxygen 
-# will generate a verbatim copy of the header file for each class for 
-# which an include is specified. Set to NO to disable this.
-
-VERBATIM_HEADERS       = YES
-
-#---------------------------------------------------------------------------
-# configuration options related to the alphabetical class index
-#---------------------------------------------------------------------------
-
-# If the ALPHABETICAL_INDEX tag is set to YES, an alphabetical index 
-# of all compounds will be generated. Enable this if the project 
-# contains a lot of classes, structs, unions or interfaces.
-
-ALPHABETICAL_INDEX     = YES
-
-# If the alphabetical index is enabled (see ALPHABETICAL_INDEX) then 
-# the COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns 
-# in which this list will be split (can be a number in the range [1..20])
-
-COLS_IN_ALPHA_INDEX    = 5
-
-# In case all classes in a project start with a common prefix, all 
-# classes will be put under the same header in the alphabetical index. 
-# The IGNORE_PREFIX tag can be used to specify one or more prefixes that 
-# should be ignored while generating the index headers.
-
-IGNORE_PREFIX          = 
-
-#---------------------------------------------------------------------------
-# configuration options related to the HTML output
-#---------------------------------------------------------------------------
-
-# If the GENERATE_HTML tag is set to YES (the default) Doxygen will 
-# generate HTML output.
-
-GENERATE_HTML          = YES
-
-# The HTML_OUTPUT tag is used to specify where the HTML docs will be put. 
-# If a relative path is entered the value of OUTPUT_DIRECTORY will be 
-# put in front of it. If left blank `html' will be used as the default path.
-
-HTML_OUTPUT            = html
-
-# The HTML_FILE_EXTENSION tag can be used to specify the file extension for 
-# each generated HTML page (for example: .htm,.php,.asp). If it is left blank 
-# doxygen will generate files with .html extension.
-
-HTML_FILE_EXTENSION    = .html
-
-# The HTML_HEADER tag can be used to specify a personal HTML header for 
-# each generated HTML page. If it is left blank doxygen will generate a 
-# standard header.
-
-HTML_HEADER            = @srcdir@/doxygen.head
-
-# The HTML_FOOTER tag can be used to specify a personal HTML footer for 
-# each generated HTML page. If it is left blank doxygen will generate a 
-# standard footer.
-
-HTML_FOOTER            = @srcdir@/doxygen.foot
-
-# The HTML_STYLESHEET tag can be used to specify a user-defined cascading 
-# style sheet that is used by each HTML page. It can be used to 
-# fine-tune the look of the HTML output. If the tag is left blank doxygen 
-# will generate a default style sheet
-
-HTML_STYLESHEET        = @srcdir@/doxygen.css
-
-# If the HTML_ALIGN_MEMBERS tag is set to YES, the members of classes, 
-# files or namespaces will be aligned in HTML using tables. If set to 
-# NO a bullet list will be used.
-
-HTML_ALIGN_MEMBERS     = YES
-
-# If the GENERATE_HTMLHELP tag is set to YES, additional index files 
-# will be generated that can be used as input for tools like the 
-# Microsoft HTML help workshop to generate a compressed HTML help file (.chm) 
-# of the generated HTML documentation.
-
-GENERATE_HTMLHELP      = NO
-
-# If the GENERATE_HTMLHELP tag is set to YES, the CHM_FILE tag can 
-# be used to specify the file name of the resulting .chm file. You 
-# can add a path in front of the file if the result should not be 
-# written to the html output dir.
-
-CHM_FILE               = 
-
-# If the GENERATE_HTMLHELP tag is set to YES, the HHC_LOCATION tag can 
-# be used to specify the location (absolute path including file name) of 
-# the HTML help compiler (hhc.exe). If non-empty doxygen will try to run 
-# the HTML help compiler on the generated index.hhp.
-
-HHC_LOCATION           = 
-
-# If the GENERATE_HTMLHELP tag is set to YES, the GENERATE_CHI flag 
-# controls if a separate .chi index file is generated (YES) or that 
-# it should be included in the master .chm file (NO).
-
-GENERATE_CHI           = NO
-
-# If the GENERATE_HTMLHELP tag is set to YES, the BINARY_TOC flag 
-# controls whether a binary table of contents is generated (YES) or a 
-# normal table of contents (NO) in the .chm file.
-
-BINARY_TOC             = NO
-
-# The TOC_EXPAND flag can be set to YES to add extra items for group members 
-# to the contents of the HTML help documentation and to the tree view.
-
-TOC_EXPAND             = NO
-
-# The DISABLE_INDEX tag can be used to turn on/off the condensed index at 
-# top of each HTML page. The value NO (the default) enables the index and 
-# the value YES disables it.
-
-DISABLE_INDEX          = NO
-
-# This tag can be used to set the number of enum values (range [1..20]) 
-# that doxygen will group on one line in the generated HTML documentation.
-
-ENUM_VALUES_PER_LINE   = 4
-
-# If the GENERATE_TREEVIEW tag is set to YES, a side panel will be
-# generated containing a tree-like index structure (just like the one that 
-# is generated for HTML Help). For this to work a browser that supports 
-# JavaScript, DHTML, CSS and frames is required (for instance Mozilla 1.0+, 
-# Netscape 6.0+, Internet explorer 5.0+, or Konqueror). Windows users are 
-# probably better off using the HTML help feature.
-
-GENERATE_TREEVIEW      = YES
-
-# If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be 
-# used to set the initial width (in pixels) of the frame in which the tree 
-# is shown.
-
-TREEVIEW_WIDTH         = 250
-
-#---------------------------------------------------------------------------
-# configuration options related to the LaTeX output
-#---------------------------------------------------------------------------
-
-# If the GENERATE_LATEX tag is set to YES (the default) Doxygen will 
-# generate Latex output.
-
-GENERATE_LATEX         = NO
-
-# The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. 
-# If a relative path is entered the value of OUTPUT_DIRECTORY will be 
-# put in front of it. If left blank `latex' will be used as the default path.
-
-LATEX_OUTPUT           = latex
-
-# The LATEX_CMD_NAME tag can be used to specify the LaTeX command name to be 
-# invoked. If left blank `latex' will be used as the default command name.
-
-LATEX_CMD_NAME         = latex
-
-# The MAKEINDEX_CMD_NAME tag can be used to specify the command name to 
-# generate index for LaTeX. If left blank `makeindex' will be used as the 
-# default command name.
-
-MAKEINDEX_CMD_NAME     = makeindex
-
-# If the COMPACT_LATEX tag is set to YES Doxygen generates more compact 
-# LaTeX documents. This may be useful for small projects and may help to 
-# save some trees in general.
-
-COMPACT_LATEX          = NO
-
-# The PAPER_TYPE tag can be used to set the paper type that is used 
-# by the printer. Possible values are: a4, a4wide, letter, legal and 
-# executive. If left blank a4wide will be used.
-
-PAPER_TYPE             = a4wide
-
-# The EXTRA_PACKAGES tag can be to specify one or more names of LaTeX 
-# packages that should be included in the LaTeX output.
-
-EXTRA_PACKAGES         = 
-
-# The LATEX_HEADER tag can be used to specify a personal LaTeX header for 
-# the generated latex document. The header should contain everything until 
-# the first chapter. If it is left blank doxygen will generate a 
-# standard header. Notice: only use this tag if you know what you are doing!
-
-LATEX_HEADER           = 
-
-# If the PDF_HYPERLINKS tag is set to YES, the LaTeX that is generated 
-# is prepared for conversion to pdf (using ps2pdf). The pdf file will 
-# contain links (just like the HTML output) instead of page references 
-# This makes the output suitable for online browsing using a pdf viewer.
-
-PDF_HYPERLINKS         = NO
-
-# If the USE_PDFLATEX tag is set to YES, pdflatex will be used instead of 
-# plain latex in the generated Makefile. Set this option to YES to get a 
-# higher quality PDF documentation.
-
-USE_PDFLATEX           = NO
-
-# If the LATEX_BATCHMODE tag is set to YES, doxygen will add the \\batchmode. 
-# command to the generated LaTeX files. This will instruct LaTeX to keep 
-# running if errors occur, instead of asking the user for help. 
-# This option is also used when generating formulas in HTML.
-
-LATEX_BATCHMODE        = NO
-
-# If LATEX_HIDE_INDICES is set to YES then doxygen will not 
-# include the index chapters (such as File Index, Compound Index, etc.) 
-# in the output.
-
-LATEX_HIDE_INDICES     = NO
-
-#---------------------------------------------------------------------------
-# configuration options related to the RTF output
-#---------------------------------------------------------------------------
-
-# If the GENERATE_RTF tag is set to YES Doxygen will generate RTF output 
-# The RTF output is optimised for Word 97 and may not look very pretty with 
-# other RTF readers or editors.
-
-GENERATE_RTF           = NO
-
-# The RTF_OUTPUT tag is used to specify where the RTF docs will be put. 
-# If a relative path is entered the value of OUTPUT_DIRECTORY will be 
-# put in front of it. If left blank `rtf' will be used as the default path.
-
-RTF_OUTPUT             = rtf
-
-# If the COMPACT_RTF tag is set to YES Doxygen generates more compact 
-# RTF documents. This may be useful for small projects and may help to 
-# save some trees in general.
-
-COMPACT_RTF            = NO
-
-# If the RTF_HYPERLINKS tag is set to YES, the RTF that is generated 
-# will contain hyperlink fields. The RTF file will 
-# contain links (just like the HTML output) instead of page references. 
-# This makes the output suitable for online browsing using WORD or other 
-# programs which support those fields. 
-# Note: wordpad (write) and others do not support links.
-
-RTF_HYPERLINKS         = NO
-
-# Load stylesheet definitions from file. Syntax is similar to doxygen's 
-# config file, i.e. a series of assigments. You only have to provide 
-# replacements, missing definitions are set to their default value.
-
-RTF_STYLESHEET_FILE    = 
-
-# Set optional variables used in the generation of an rtf document. 
-# Syntax is similar to doxygen's config file.
-
-RTF_EXTENSIONS_FILE    = 
-
-#---------------------------------------------------------------------------
-# configuration options related to the man page output
-#---------------------------------------------------------------------------
-
-# If the GENERATE_MAN tag is set to YES (the default) Doxygen will 
-# generate man pages
-
-GENERATE_MAN           = NO
-
-# The MAN_OUTPUT tag is used to specify where the man pages will be put. 
-# If a relative path is entered the value of OUTPUT_DIRECTORY will be 
-# put in front of it. If left blank `man' will be used as the default path.
-
-MAN_OUTPUT             = man
-
-# The MAN_EXTENSION tag determines the extension that is added to 
-# the generated man pages (default is the subroutine's section .3)
-
-MAN_EXTENSION          = .3
-
-# If the MAN_LINKS tag is set to YES and Doxygen generates man output, 
-# then it will generate one additional man file for each entity 
-# documented in the real man page(s). These additional files 
-# only source the real man page, but without them the man command 
-# would be unable to find the correct page. The default is NO.
-
-MAN_LINKS              = NO
-
-#---------------------------------------------------------------------------
-# configuration options related to the XML output
-#---------------------------------------------------------------------------
-
-# If the GENERATE_XML tag is set to YES Doxygen will 
-# generate an XML file that captures the structure of 
-# the code including all documentation. Note that this 
-# feature is still experimental and incomplete at the 
-# moment.
-
-GENERATE_XML           = NO
-
-# The XML_OUTPUT tag is used to specify where the XML pages will be put. 
-# If a relative path is entered the value of OUTPUT_DIRECTORY will be 
-# put in front of it. If left blank `xml' will be used as the default path.
-
-XML_OUTPUT             = xml
-
-# The XML_SCHEMA tag can be used to specify an XML schema, 
-# which can be used by a validating XML parser to check the 
-# syntax of the XML files.
-
-XML_SCHEMA             = 
-
-# The XML_DTD tag can be used to specify an XML DTD, 
-# which can be used by a validating XML parser to check the 
-# syntax of the XML files.
-
-XML_DTD                = 
-
-#---------------------------------------------------------------------------
-# configuration options for the AutoGen Definitions output
-#---------------------------------------------------------------------------
-
-# If the GENERATE_AUTOGEN_DEF tag is set to YES Doxygen will 
-# generate an AutoGen Definitions (see autogen.sf.net) file 
-# that captures the structure of the code including all 
-# documentation. Note that this feature is still experimental 
-# and incomplete at the moment.
-
-GENERATE_AUTOGEN_DEF   = NO
-
-#---------------------------------------------------------------------------
-# configuration options related to the Perl module output
-#---------------------------------------------------------------------------
-
-# If the GENERATE_PERLMOD tag is set to YES Doxygen will 
-# generate a Perl module file that captures the structure of 
-# the code including all documentation. Note that this 
-# feature is still experimental and incomplete at the 
-# moment.
-
-GENERATE_PERLMOD       = NO
-
-# If the PERLMOD_LATEX tag is set to YES Doxygen will generate 
-# the necessary Makefile rules, Perl scripts and LaTeX code to be able 
-# to generate PDF and DVI output from the Perl module output.
-
-PERLMOD_LATEX          = NO
-
-# If the PERLMOD_PRETTY tag is set to YES the Perl module output will be 
-# nicely formatted so it can be parsed by a human reader.  This is useful 
-# if you want to understand what is going on.  On the other hand, if this 
-# tag is set to NO the size of the Perl module output will be much smaller 
-# and Perl will parse it just the same.
-
-PERLMOD_PRETTY         = YES
-
-# The names of the make variables in the generated doxyrules.make file 
-# are prefixed with the string contained in PERLMOD_MAKEVAR_PREFIX. 
-# This is useful so different doxyrules.make files included by the same 
-# Makefile don't overwrite each other's variables.
-
-PERLMOD_MAKEVAR_PREFIX = 
-
-#---------------------------------------------------------------------------
-# Configuration options related to the preprocessor   
-#---------------------------------------------------------------------------
-
-# If the ENABLE_PREPROCESSING tag is set to YES (the default) Doxygen will 
-# evaluate all C-preprocessor directives found in the sources and include 
-# files.
-
-ENABLE_PREPROCESSING   = YES
-
-# If the MACRO_EXPANSION tag is set to YES Doxygen will expand all macro 
-# names in the source code. If set to NO (the default) only conditional 
-# compilation will be performed. Macro expansion can be done in a controlled 
-# way by setting EXPAND_ONLY_PREDEF to YES.
-
-MACRO_EXPANSION        = NO
-
-# If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES 
-# then the macro expansion is limited to the macros specified with the 
-# PREDEFINED and EXPAND_AS_PREDEFINED tags.
-
-EXPAND_ONLY_PREDEF     = NO
-
-# If the SEARCH_INCLUDES tag is set to YES (the default) the includes files 
-# in the INCLUDE_PATH (see below) will be search if a #include is found.
-
-SEARCH_INCLUDES        = YES
-
-# The INCLUDE_PATH tag can be used to specify one or more directories that 
-# contain include files that are not input files but should be processed by 
-# the preprocessor.
-
-INCLUDE_PATH           = 
-
-# You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard 
-# patterns (like *.h and *.hpp) to filter out the header-files in the 
-# directories. If left blank, the patterns specified with FILE_PATTERNS will 
-# be used.
-
-INCLUDE_FILE_PATTERNS  = 
-
-# The PREDEFINED tag can be used to specify one or more macro names that 
-# are defined before the preprocessor is started (similar to the -D option of 
-# gcc). The argument of the tag is a list of macros of the form: name 
-# or name=definition (no spaces). If the definition and the = are 
-# omitted =1 is assumed.
-
-PREDEFINED             = SHAPE \
-                         RENDER \
-                         XKB \
-                         XINPUT
-
-# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then 
-# this tag can be used to specify a list of macro names that should be expanded. 
-# The macro definition that is found in the sources will be used. 
-# Use the PREDEFINED tag if you want to use a different macro definition.
-
-EXPAND_AS_DEFINED      = 
-
-# If the SKIP_FUNCTION_MACROS tag is set to YES (the default) then 
-# doxygen's preprocessor will remove all function-like macros that are alone 
-# on a line, have an all uppercase name, and do not end with a semicolon. Such 
-# function macros are typically used for boiler-plate code, and will confuse the 
-# parser if not removed.
-
-SKIP_FUNCTION_MACROS   = YES
-
-#---------------------------------------------------------------------------
-# Configuration::addtions related to external references   
-#---------------------------------------------------------------------------
-
-# The TAGFILES option can be used to specify one or more tagfiles. 
-# Optionally an initial location of the external documentation 
-# can be added for each tagfile. The format of a tag file without 
-# this location is as follows: 
-#   TAGFILES = file1 file2 ... 
-# Adding location for the tag files is done as follows: 
-#   TAGFILES = file1=loc1 "file2 = loc2" ... 
-# where "loc1" and "loc2" can be relative or absolute paths or 
-# URLs. If a location is present for each tag, the installdox tool 
-# does not have to be run to correct the links.
-# Note that each tag file must have a unique name
-# (where the name does NOT include the path)
-# If a tag file is not located in the directory in which doxygen 
-# is run, you must also specify the path to the tagfile here.
-
-TAGFILES               = 
-
-# When a file name is specified after GENERATE_TAGFILE, doxygen will create 
-# a tag file that is based on the input files it reads.
-
-GENERATE_TAGFILE       = 
-
-# If the ALLEXTERNALS tag is set to YES all external classes will be listed 
-# in the class index. If set to NO only the inherited external classes 
-# will be listed.
-
-ALLEXTERNALS           = NO
-
-# If the EXTERNAL_GROUPS tag is set to YES all external groups will be listed 
-# in the modules index. If set to NO, only the current project's groups will 
-# be listed.
-
-EXTERNAL_GROUPS        = YES
-
-# The PERL_PATH should be the absolute path and name of the perl script 
-# interpreter (i.e. the result of `which perl').
-
-PERL_PATH              = /usr/bin/perl
-
-#---------------------------------------------------------------------------
-# Configuration options related to the dot tool   
-#---------------------------------------------------------------------------
-
-# If the CLASS_DIAGRAMS tag is set to YES (the default) Doxygen will 
-# generate a inheritance diagram (in HTML, RTF and LaTeX) for classes with base or 
-# super classes. Setting the tag to NO turns the diagrams off. Note that this 
-# option is superceded by the HAVE_DOT option below. This is only a fallback. It is 
-# recommended to install and use dot, since it yields more powerful graphs.
-
-CLASS_DIAGRAMS         = YES
-
-# If set to YES, the inheritance and collaboration graphs will hide 
-# inheritance and usage relations if the target is undocumented 
-# or is not a class.
-
-HIDE_UNDOC_RELATIONS   = YES
-
-# If you set the HAVE_DOT tag to YES then doxygen will assume the dot tool is 
-# available from the path. This tool is part of Graphviz, a graph visualization 
-# toolkit from AT&T and Lucent Bell Labs. The other options in this section 
-# have no effect if this option is set to NO (the default)
-
-HAVE_DOT               = NO
-
-# If the CLASS_GRAPH and HAVE_DOT tags are set to YES then doxygen 
-# will generate a graph for each documented class showing the direct and 
-# indirect inheritance relations. Setting this tag to YES will force the 
-# the CLASS_DIAGRAMS tag to NO.
-
-CLASS_GRAPH            = YES
-
-# If the COLLABORATION_GRAPH and HAVE_DOT tags are set to YES then doxygen 
-# will generate a graph for each documented class showing the direct and 
-# indirect implementation dependencies (inheritance, containment, and 
-# class references variables) of the class with other documented classes.
-
-COLLABORATION_GRAPH    = YES
-
-# If the UML_LOOK tag is set to YES doxygen will generate inheritance and 
-# collaboration diagrams in a style similiar to the OMG's Unified Modeling 
-# Language.
-
-UML_LOOK               = NO
-
-# If set to YES, the inheritance and collaboration graphs will show the 
-# relations between templates and their instances.
-
-TEMPLATE_RELATIONS     = YES
-
-# If the ENABLE_PREPROCESSING, SEARCH_INCLUDES, INCLUDE_GRAPH, and HAVE_DOT 
-# tags are set to YES then doxygen will generate a graph for each documented 
-# file showing the direct and indirect include dependencies of the file with 
-# other documented files.
-
-INCLUDE_GRAPH          = YES
-
-# If the ENABLE_PREPROCESSING, SEARCH_INCLUDES, INCLUDED_BY_GRAPH, and 
-# HAVE_DOT tags are set to YES then doxygen will generate a graph for each 
-# documented header file showing the documented files that directly or 
-# indirectly include this file.
-
-INCLUDED_BY_GRAPH      = YES
-
-# If the CALL_GRAPH and HAVE_DOT tags are set to YES then doxygen will 
-# generate a call dependency graph for every global function or class method. 
-# Note that enabling this option will significantly increase the time of a run. 
-# So in most cases it will be better to enable call graphs for selected 
-# functions only using the \callgraph command.
-
-CALL_GRAPH             = NO
-
-# If the GRAPHICAL_HIERARCHY and HAVE_DOT tags are set to YES then doxygen 
-# will graphical hierarchy of all classes instead of a textual one.
-
-GRAPHICAL_HIERARCHY    = YES
-
-# The DOT_IMAGE_FORMAT tag can be used to set the image format of the images 
-# generated by dot. Possible values are png, jpg, or gif
-# If left blank png will be used.
-
-DOT_IMAGE_FORMAT       = gif
-
-# The tag DOT_PATH can be used to specify the path where the dot tool can be 
-# found. If left blank, it is assumed the dot tool can be found on the path.
-
-DOT_PATH               = 
-
-# The DOTFILE_DIRS tag can be used to specify one or more directories that 
-# contain dot files that are included in the documentation (see the 
-# \dotfile command).
-
-DOTFILE_DIRS           = 
-
-# The MAX_DOT_GRAPH_DEPTH tag can be used to set the maximum depth of the 
-# graphs generated by dot. A depth value of 3 means that only nodes reachable 
-# from the root by following a path via at most 3 edges will be shown. Nodes that 
-# lay further from the root node will be omitted. Note that setting this option to 
-# 1 or 2 may greatly reduce the computation time needed for large code bases. Also 
-# note that a graph may be further truncated if the graph's image dimensions are 
-# not sufficient to fit the graph (see MAX_DOT_GRAPH_WIDTH and MAX_DOT_GRAPH_HEIGHT). 
-# If 0 is used for the depth value (the default), the graph is not depth-constrained.
-
-MAX_DOT_GRAPH_DEPTH    = 0
-
-# If the GENERATE_LEGEND tag is set to YES (the default) Doxygen will 
-# generate a legend page explaining the meaning of the various boxes and 
-# arrows in the dot generated graphs.
-
-GENERATE_LEGEND        = YES
-
-# If the DOT_CLEANUP tag is set to YES (the default) Doxygen will 
-# remove the intermediate dot files that are used to generate 
-# the various graphs.
-
-DOT_CLEANUP            = YES
-
-#---------------------------------------------------------------------------
-# Configuration::addtions related to the search engine   
-#---------------------------------------------------------------------------
-
-# The SEARCHENGINE tag specifies whether or not a search engine should be 
-# used. If set to NO the values of all tags below this one will be ignored.
-
-SEARCHENGINE           = NO
diff --git a/xorg-server/hw/dmx/doc/doxygen.css b/xorg-server/hw/dmx/doc/doxygen.css
deleted file mode 100644
index 841f709a7..000000000
--- a/xorg-server/hw/dmx/doc/doxygen.css
+++ /dev/null
@@ -1,49 +0,0 @@
-H1 { text-align: center; }
-CAPTION { font-weight: bold }
-A.qindex {}
-A.qindexRef {}
-A.el { text-decoration: none; font-weight: bold }
-A.elRef { font-weight: bold }
-A.code { text-decoration: none; font-weight: normal; color: #4444ee }
-A.codeRef { font-weight: normal; color: #4444ee }
-A:hover { text-decoration: none; background-color: #f2f2ff }
-DL.el { margin-left: -1cm }
-DIV.fragment { width: 100%; border: none; background-color: #eeeeee }
-DIV.ah { background-color: black; font-weight: bold; color: #ffffff; margin-bottom: 3px; margin-top: 3px }
-TD.md { background-color: #f2f2ff; font-weight: bold; }
-TD.mdname1 { background-color: #f2f2ff; font-weight: bold; color: #602020; }
-TD.mdname { background-color: #f2f2ff; font-weight: bold; color: #602020; width: 600px; }
-DIV.groupHeader { margin-left: 16px; margin-top: 12px; margin-bottom: 6px; font-weight: bold }
-DIV.groupText { margin-left: 16px; font-style: italic; font-size: smaller }
-BODY { background: white }
-TD.indexkey { 
-   background-color: #eeeeff; 
-   font-weight: bold; 
-   padding-right  : 10px; 
-   padding-top    : 2px; 
-   padding-left   : 10px; 
-   padding-bottom : 2px; 
-   margin-left    : 0px; 
-   margin-right   : 0px; 
-   margin-top     : 2px; 
-   margin-bottom  : 2px  
-}
-TD.indexvalue { 
-   background-color: #eeeeff; 
-   font-style: italic; 
-   padding-right  : 10px; 
-   padding-top    : 2px; 
-   padding-left   : 10px; 
-   padding-bottom : 2px; 
-   margin-left    : 0px; 
-   margin-right   : 0px; 
-   margin-top     : 2px; 
-   margin-bottom  : 2px  
-}
-FONT.keyword       { color: #008000 }
-FONT.keywordtype   { color: #604020 }
-FONT.keywordflow   { color: #e08000 }
-FONT.comment       { color: #800000 }
-FONT.preprocessor  { color: #806020 }
-FONT.stringliteral { color: #002080 }
-FONT.charliteral   { color: #008080 }
diff --git a/xorg-server/hw/dmx/doc/doxygen.foot b/xorg-server/hw/dmx/doc/doxygen.foot
deleted file mode 100644
index 3aca11763..000000000
--- a/xorg-server/hw/dmx/doc/doxygen.foot
+++ /dev/null
@@ -1,12 +0,0 @@
-    <hr>
-    <address>
-      <small>
-        Generated June 29, 2004 for <a
-        href="http://dmx.sourceforge.net">Distributed Multihead X</a> by
-        <a href="http://www.doxygen.org/index.html">doxygen</a>
-        1.3.4.
-      </small>
-    </addres>
-    </hr>
-  </body>
-</html>
diff --git a/xorg-server/hw/dmx/doc/doxygen.head b/xorg-server/hw/dmx/doc/doxygen.head
deleted file mode 100644
index 89bda8fda..000000000
--- a/xorg-server/hw/dmx/doc/doxygen.head
+++ /dev/null
@@ -1,8 +0,0 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
-<html>
-  <head>
-    <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
-    <title>File Index</title>
-    <link href="doxygen.css" rel="stylesheet" type="text/css">
-  </head>
-  <body>
diff --git a/xorg-server/hw/xfree86/doc/sgml/Makefile.am b/xorg-server/hw/dmx/doxygen/Makefile.am
index e6661c544..fe159df5c 100644
--- a/xorg-server/hw/xfree86/doc/sgml/Makefile.am
+++ b/xorg-server/hw/dmx/doxygen/Makefile.am
@@ -1,27 +1,36 @@
-#  Copyright 2005 Red Hat, Inc.

-#

-#  Permission to use, copy, modify, distribute, and sell this software

-#  and its documentation for any purpose is hereby granted without

-#  fee, provided that the above copyright notice appear in all copies

-#  and that both that copyright notice and this permission notice

-#  appear in supporting documentation, and that the name of Red Hat

-#  not be used in advertising or publicity pertaining to distribution

-#  of the software without specific, written prior permission.  Red

-#  Hat makes no representations about the suitability of this software

-#  for any purpose.  It is provided "as is" without express or implied

-#  warranty.

-#

-#  RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

-#  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN

-#  NO EVENT SHALL RED HAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR

-#  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS

-#  OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,

-#  NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

-#  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

-

-doc_sources = DESIGN.xml

-

-# Developer's documentation is not installed

-if ENABLE_DEVEL_DOCS

-include $(top_srcdir)/doc/xml/xmlrules-noinst.in

-endif

+#  Copyright 2005 Red Hat, Inc.
+#
+#  Permission to use, copy, modify, distribute, and sell this software
+#  and its documentation for any purpose is hereby granted without
+#  fee, provided that the above copyright notice appear in all copies
+#  and that both that copyright notice and this permission notice
+#  appear in supporting documentation, and that the name of Red Hat
+#  not be used in advertising or publicity pertaining to distribution
+#  of the software without specific, written prior permission.  Red
+#  Hat makes no representations about the suitability of this software
+#  for any purpose.  It is provided "as is" without express or implied
+#  warranty.
+#
+#  RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+#  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
+#  NO EVENT SHALL RED HAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+#  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+#  OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+#  NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+#  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+if ENABLE_DEVEL_DOCS
+if HAVE_DOXYGEN
+
+# Developers documentation is not installed
+noinst_DATA = html/index.html
+dist_noinst_DATA = doxygen.conf.in footer.html
+
+html/index.html:
+	$(AM_V_GEN)$(DOXYGEN) doxygen.conf
+
+clean-local:
+	$(AM_V_at)rm -fr html/
+
+endif HAVE_DOXYGEN
+endif ENABLE_DEVEL_DOCS
diff --git a/xorg-server/hw/dmx/doxygen/doxygen.conf.in b/xorg-server/hw/dmx/doxygen/doxygen.conf.in
new file mode 100644
index 000000000..3dbb27ec0
--- /dev/null
+++ b/xorg-server/hw/dmx/doxygen/doxygen.conf.in
@@ -0,0 +1,1559 @@
+# Doxyfile 1.6.2
+
+# This file describes the settings to be used by the documentation system
+# doxygen (www.doxygen.org) for a project
+#
+# All text after a hash (#) is considered a comment and will be ignored
+# The format is:
+#       TAG = value [value, ...]
+# For lists items can also be appended using:
+#       TAG += value [value, ...]
+# Values that contain spaces should be placed between quotes (" ")
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
+
+# This tag specifies the encoding used for all characters in the config file
+# that follow. The default is UTF-8 which is also the encoding used for all
+# text before the first occurrence of this tag. Doxygen uses libiconv (or the
+# iconv built into libc) for the transcoding. See
+# http://www.gnu.org/software/libiconv for the list of possible encodings.
+
+DOXYFILE_ENCODING      = UTF-8
+
+# The PROJECT_NAME tag is a single word (or a sequence of words surrounded
+# by quotes) that should identify the project.
+
+PROJECT_NAME           = "Distributed Multihead X"
+
+# The PROJECT_NUMBER tag can be used to enter a project or revision number.
+# This could be handy for archiving the generated documentation or
+# if some version control system is used.
+
+PROJECT_NUMBER         = "@PACKAGE_VERSION@"
+
+# The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
+# base path where the generated documentation will be put.
+# If a relative path is entered, it will be relative to the location
+# where doxygen was started. If left blank the current directory will be used.
+
+OUTPUT_DIRECTORY       =
+
+# If the CREATE_SUBDIRS tag is set to YES, then doxygen will create
+# 4096 sub-directories (in 2 levels) under the output directory of each output
+# format and will distribute the generated files over these directories.
+# Enabling this option can be useful when feeding doxygen a huge amount of
+# source files, where putting all generated files in the same directory would
+# otherwise cause performance problems for the file system.
+
+CREATE_SUBDIRS         = NO
+
+# The OUTPUT_LANGUAGE tag is used to specify the language in which all
+# documentation generated by doxygen is written. Doxygen will use this
+# information to generate all constant output in the proper language.
+# The default language is English, other supported languages are:
+# Afrikaans, Arabic, Brazilian, Catalan, Chinese, Chinese-Traditional,
+# Croatian, Czech, Danish, Dutch, Esperanto, Farsi, Finnish, French, German,
+# Greek, Hungarian, Italian, Japanese, Japanese-en (Japanese with English
+# messages), Korean, Korean-en, Lithuanian, Norwegian, Macedonian, Persian,
+# Polish, Portuguese, Romanian, Russian, Serbian, Serbian-Cyrilic, Slovak,
+# Slovene, Spanish, Swedish, Ukrainian, and Vietnamese.
+
+OUTPUT_LANGUAGE        = English
+
+# If the BRIEF_MEMBER_DESC tag is set to YES (the default) Doxygen will
+# include brief member descriptions after the members that are listed in
+# the file and class documentation (similar to JavaDoc).
+# Set to NO to disable this.
+
+BRIEF_MEMBER_DESC      = YES
+
+# If the REPEAT_BRIEF tag is set to YES (the default) Doxygen will prepend
+# the brief description of a member or function before the detailed description.
+# Note: if both HIDE_UNDOC_MEMBERS and BRIEF_MEMBER_DESC are set to NO, the
+# brief descriptions will be completely suppressed.
+
+REPEAT_BRIEF           = YES
+
+# This tag implements a quasi-intelligent brief description abbreviator
+# that is used to form the text in various listings. Each string
+# in this list, if found as the leading text of the brief description, will be
+# stripped from the text and the result after processing the whole list, is
+# used as the annotated text. Otherwise, the brief description is used as-is.
+# If left blank, the following values are used ("$name" is automatically
+# replaced with the name of the entity): "The $name class" "The $name widget"
+# "The $name file" "is" "provides" "specifies" "contains"
+# "represents" "a" "an" "the"
+
+ABBREVIATE_BRIEF       =
+
+# If the ALWAYS_DETAILED_SEC and REPEAT_BRIEF tags are both set to YES then
+# Doxygen will generate a detailed section even if there is only a brief
+# description.
+
+ALWAYS_DETAILED_SEC    = YES
+
+# If the INLINE_INHERITED_MEMB tag is set to YES, doxygen will show all
+# inherited members of a class in the documentation of that class as if those
+# members were ordinary class members. Constructors, destructors and assignment
+# operators of the base classes will not be shown.
+
+INLINE_INHERITED_MEMB  = NO
+
+# If the FULL_PATH_NAMES tag is set to YES then Doxygen will prepend the full
+# path before files name in the file list and in the header files. If set
+# to NO the shortest path that makes the file name unique will be used.
+
+FULL_PATH_NAMES        = NO
+
+# If the FULL_PATH_NAMES tag is set to YES then the STRIP_FROM_PATH tag
+# can be used to strip a user-defined part of the path. Stripping is
+# only done if one of the specified strings matches the left-hand part of
+# the path. The tag can be used to show relative paths in the file list.
+# If left blank the directory from which doxygen is run is used as the
+# path to strip.
+
+STRIP_FROM_PATH        =
+
+# The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of
+# the path mentioned in the documentation of a class, which tells
+# the reader which header file to include in order to use a class.
+# If left blank only the name of the header file containing the class
+# definition is used. Otherwise one should specify the include paths that
+# are normally passed to the compiler using the -I flag.
+
+STRIP_FROM_INC_PATH    =
+
+# If the SHORT_NAMES tag is set to YES, doxygen will generate much shorter
+# (but less readable) file names. This can be useful is your file systems
+# doesn't support long names like on DOS, Mac, or CD-ROM.
+
+SHORT_NAMES            = NO
+
+# If the JAVADOC_AUTOBRIEF tag is set to YES then Doxygen
+# will interpret the first line (until the first dot) of a JavaDoc-style
+# comment as the brief description. If set to NO, the JavaDoc
+# comments will behave just like regular Qt-style comments
+# (thus requiring an explicit @brief command for a brief description.)
+
+JAVADOC_AUTOBRIEF      = NO
+
+# If the QT_AUTOBRIEF tag is set to YES then Doxygen will
+# interpret the first line (until the first dot) of a Qt-style
+# comment as the brief description. If set to NO, the comments
+# will behave just like regular Qt-style comments (thus requiring
+# an explicit \brief command for a brief description.)
+
+QT_AUTOBRIEF           = NO
+
+# The MULTILINE_CPP_IS_BRIEF tag can be set to YES to make Doxygen
+# treat a multi-line C++ special comment block (i.e. a block of //! or ///
+# comments) as a brief description. This used to be the default behaviour.
+# The new default is to treat a multi-line C++ comment block as a detailed
+# description. Set this tag to YES if you prefer the old behaviour instead.
+
+MULTILINE_CPP_IS_BRIEF = NO
+
+# If the INHERIT_DOCS tag is set to YES (the default) then an undocumented
+# member inherits the documentation from any documented member that it
+# re-implements.
+
+INHERIT_DOCS           = YES
+
+# If the SEPARATE_MEMBER_PAGES tag is set to YES, then doxygen will produce
+# a new page for each member. If set to NO, the documentation of a member will
+# be part of the file/class/namespace that contains it.
+
+SEPARATE_MEMBER_PAGES  = NO
+
+# The TAB_SIZE tag can be used to set the number of spaces in a tab.
+# Doxygen uses this value to replace tabs by spaces in code fragments.
+
+TAB_SIZE               = 8
+
+# This tag can be used to specify a number of aliases that acts
+# as commands in the documentation. An alias has the form "name=value".
+# For example adding "sideeffect=\par Side Effects:\n" will allow you to
+# put the command \sideeffect (or @sideeffect) in the documentation, which
+# will result in a user-defined paragraph with heading "Side Effects:".
+# You can put \n's in the value part of an alias to insert newlines.
+
+ALIASES                =
+
+# Set the OPTIMIZE_OUTPUT_FOR_C tag to YES if your project consists of C
+# sources only. Doxygen will then generate output that is more tailored for C.
+# For instance, some of the names that are used will be different. The list
+# of all members will be omitted, etc.
+
+OPTIMIZE_OUTPUT_FOR_C  = YES
+
+# Set the OPTIMIZE_OUTPUT_JAVA tag to YES if your project consists of Java
+# sources only. Doxygen will then generate output that is more tailored for
+# Java. For instance, namespaces will be presented as packages, qualified
+# scopes will look different, etc.
+
+OPTIMIZE_OUTPUT_JAVA   = NO
+
+# Set the OPTIMIZE_FOR_FORTRAN tag to YES if your project consists of Fortran
+# sources only. Doxygen will then generate output that is more tailored for
+# Fortran.
+
+OPTIMIZE_FOR_FORTRAN   = NO
+
+# Set the OPTIMIZE_OUTPUT_VHDL tag to YES if your project consists of VHDL
+# sources. Doxygen will then generate output that is tailored for
+# VHDL.
+
+OPTIMIZE_OUTPUT_VHDL   = NO
+
+# Doxygen selects the parser to use depending on the extension of the files it parses.
+# With this tag you can assign which parser to use for a given extension.
+# Doxygen has a built-in mapping, but you can override or extend it using this tag.
+# The format is ext=language, where ext is a file extension, and language is one of
+# the parsers supported by doxygen: IDL, Java, Javascript, C#, C, C++, D, PHP,
+# Objective-C, Python, Fortran, VHDL, C, C++. For instance to make doxygen treat
+# .inc files as Fortran files (default is PHP), and .f files as C (default is Fortran),
+# use: inc=Fortran f=C. Note that for custom extensions you also need to set FILE_PATTERNS otherwise the files are not read by doxygen.
+
+EXTENSION_MAPPING      =
+
+# If you use STL classes (i.e. std::string, std::vector, etc.) but do not want
+# to include (a tag file for) the STL sources as input, then you should
+# set this tag to YES in order to let doxygen match functions declarations and
+# definitions whose arguments contain STL classes (e.g. func(std::string); v.s.
+# func(std::string) {}). This also make the inheritance and collaboration
+# diagrams that involve STL classes more complete and accurate.
+
+BUILTIN_STL_SUPPORT    = NO
+
+# If you use Microsoft's C++/CLI language, you should set this option to YES to
+# enable parsing support.
+
+CPP_CLI_SUPPORT        = NO
+
+# Set the SIP_SUPPORT tag to YES if your project consists of sip sources only.
+# Doxygen will parse them like normal C++ but will assume all classes use public
+# instead of private inheritance when no explicit protection keyword is present.
+
+SIP_SUPPORT            = NO
+
+# For Microsoft's IDL there are propget and propput attributes to indicate getter
+# and setter methods for a property. Setting this option to YES (the default)
+# will make doxygen to replace the get and set methods by a property in the
+# documentation. This will only work if the methods are indeed getting or
+# setting a simple type. If this is not the case, or you want to show the
+# methods anyway, you should set this option to NO.
+
+IDL_PROPERTY_SUPPORT   = YES
+
+# If member grouping is used in the documentation and the DISTRIBUTE_GROUP_DOC
+# tag is set to YES, then doxygen will reuse the documentation of the first
+# member in the group (if any) for the other members of the group. By default
+# all members of a group must be documented explicitly.
+
+DISTRIBUTE_GROUP_DOC   = NO
+
+# Set the SUBGROUPING tag to YES (the default) to allow class member groups of
+# the same type (for instance a group of public functions) to be put as a
+# subgroup of that type (e.g. under the Public Functions section). Set it to
+# NO to prevent subgrouping. Alternatively, this can be done per class using
+# the \nosubgrouping command.
+
+SUBGROUPING            = YES
+
+# When TYPEDEF_HIDES_STRUCT is enabled, a typedef of a struct, union, or enum
+# is documented as struct, union, or enum with the name of the typedef. So
+# typedef struct TypeS {} TypeT, will appear in the documentation as a struct
+# with name TypeT. When disabled the typedef will appear as a member of a file,
+# namespace, or class. And the struct will be named TypeS. This can typically
+# be useful for C code in case the coding convention dictates that all compound
+# types are typedef'ed and only the typedef is referenced, never the tag name.
+
+TYPEDEF_HIDES_STRUCT   = NO
+
+# The SYMBOL_CACHE_SIZE determines the size of the internal cache use to
+# determine which symbols to keep in memory and which to flush to disk.
+# When the cache is full, less often used symbols will be written to disk.
+# For small to medium size projects (<1000 input files) the default value is
+# probably good enough. For larger projects a too small cache size can cause
+# doxygen to be busy swapping symbols to and from disk most of the time
+# causing a significant performance penality.
+# If the system has enough physical memory increasing the cache will improve the
+# performance by keeping more symbols in memory. Note that the value works on
+# a logarithmic scale so increasing the size by one will rougly double the
+# memory usage. The cache size is given by this formula:
+# 2^(16+SYMBOL_CACHE_SIZE). The valid range is 0..9, the default is 0,
+# corresponding to a cache size of 2^16 = 65536 symbols
+
+SYMBOL_CACHE_SIZE      = 0
+
+#---------------------------------------------------------------------------
+# Build related configuration options
+#---------------------------------------------------------------------------
+
+# If the EXTRACT_ALL tag is set to YES doxygen will assume all entities in
+# documentation are documented, even if no documentation was available.
+# Private class members and static file members will be hidden unless
+# the EXTRACT_PRIVATE and EXTRACT_STATIC tags are set to YES
+
+EXTRACT_ALL            = YES
+
+# If the EXTRACT_PRIVATE tag is set to YES all private members of a class
+# will be included in the documentation.
+
+EXTRACT_PRIVATE        = NO
+
+# If the EXTRACT_STATIC tag is set to YES all static members of a file
+# will be included in the documentation.
+
+EXTRACT_STATIC         = YES
+
+# If the EXTRACT_LOCAL_CLASSES tag is set to YES classes (and structs)
+# defined locally in source files will be included in the documentation.
+# If set to NO only classes defined in header files are included.
+
+EXTRACT_LOCAL_CLASSES  = YES
+
+# This flag is only useful for Objective-C code. When set to YES local
+# methods, which are defined in the implementation section but not in
+# the interface are included in the documentation.
+# If set to NO (the default) only methods in the interface are included.
+
+EXTRACT_LOCAL_METHODS  = NO
+
+# If this flag is set to YES, the members of anonymous namespaces will be
+# extracted and appear in the documentation as a namespace called
+# 'anonymous_namespace{file}', where file will be replaced with the base
+# name of the file that contains the anonymous namespace. By default
+# anonymous namespace are hidden.
+
+EXTRACT_ANON_NSPACES   = NO
+
+# If the HIDE_UNDOC_MEMBERS tag is set to YES, Doxygen will hide all
+# undocumented members of documented classes, files or namespaces.
+# If set to NO (the default) these members will be included in the
+# various overviews, but no documentation section is generated.
+# This option has no effect if EXTRACT_ALL is enabled.
+
+HIDE_UNDOC_MEMBERS     = YES
+
+# If the HIDE_UNDOC_CLASSES tag is set to YES, Doxygen will hide all
+# undocumented classes that are normally visible in the class hierarchy.
+# If set to NO (the default) these classes will be included in the various
+# overviews. This option has no effect if EXTRACT_ALL is enabled.
+
+HIDE_UNDOC_CLASSES     = NO
+
+# If the HIDE_FRIEND_COMPOUNDS tag is set to YES, Doxygen will hide all
+# friend (class|struct|union) declarations.
+# If set to NO (the default) these declarations will be included in the
+# documentation.
+
+HIDE_FRIEND_COMPOUNDS  = NO
+
+# If the HIDE_IN_BODY_DOCS tag is set to YES, Doxygen will hide any
+# documentation blocks found inside the body of a function.
+# If set to NO (the default) these blocks will be appended to the
+# function's detailed documentation block.
+
+HIDE_IN_BODY_DOCS      = NO
+
+# The INTERNAL_DOCS tag determines if documentation
+# that is typed after a \internal command is included. If the tag is set
+# to NO (the default) then the documentation will be excluded.
+# Set it to YES to include the internal documentation.
+
+INTERNAL_DOCS          = NO
+
+# If the CASE_SENSE_NAMES tag is set to NO then Doxygen will only generate
+# file names in lower-case letters. If set to YES upper-case letters are also
+# allowed. This is useful if you have classes or files whose names only differ
+# in case and if your file system supports case sensitive file names. Windows
+# and Mac users are advised to set this option to NO.
+
+CASE_SENSE_NAMES       = YES
+
+# If the HIDE_SCOPE_NAMES tag is set to NO (the default) then Doxygen
+# will show members with their full class and namespace scopes in the
+# documentation. If set to YES the scope will be hidden.
+
+HIDE_SCOPE_NAMES       = NO
+
+# If the SHOW_INCLUDE_FILES tag is set to YES (the default) then Doxygen
+# will put a list of the files that are included by a file in the documentation
+# of that file.
+
+SHOW_INCLUDE_FILES     = YES
+
+# If the FORCE_LOCAL_INCLUDES tag is set to YES then Doxygen
+# will list include files with double quotes in the documentation
+# rather than with sharp brackets.
+
+FORCE_LOCAL_INCLUDES   = NO
+
+# If the INLINE_INFO tag is set to YES (the default) then a tag [inline]
+# is inserted in the documentation for inline members.
+
+INLINE_INFO            = YES
+
+# If the SORT_MEMBER_DOCS tag is set to YES (the default) then doxygen
+# will sort the (detailed) documentation of file and class members
+# alphabetically by member name. If set to NO the members will appear in
+# declaration order.
+
+SORT_MEMBER_DOCS       = YES
+
+# If the SORT_BRIEF_DOCS tag is set to YES then doxygen will sort the
+# brief documentation of file, namespace and class members alphabetically
+# by member name. If set to NO (the default) the members will appear in
+# declaration order.
+
+SORT_BRIEF_DOCS        = NO
+
+# If the SORT_MEMBERS_CTORS_1ST tag is set to YES then doxygen will sort the (brief and detailed) documentation of class members so that constructors and destructors are listed first. If set to NO (the default) the constructors will appear in the respective orders defined by SORT_MEMBER_DOCS and SORT_BRIEF_DOCS. This tag will be ignored for brief docs if SORT_BRIEF_DOCS is set to NO and ignored for detailed docs if SORT_MEMBER_DOCS is set to NO.
+
+SORT_MEMBERS_CTORS_1ST = NO
+
+# If the SORT_GROUP_NAMES tag is set to YES then doxygen will sort the
+# hierarchy of group names into alphabetical order. If set to NO (the default)
+# the group names will appear in their defined order.
+
+SORT_GROUP_NAMES       = NO
+
+# If the SORT_BY_SCOPE_NAME tag is set to YES, the class list will be
+# sorted by fully-qualified names, including namespaces. If set to
+# NO (the default), the class list will be sorted only by class name,
+# not including the namespace part.
+# Note: This option is not very useful if HIDE_SCOPE_NAMES is set to YES.
+# Note: This option applies only to the class list, not to the
+# alphabetical list.
+
+SORT_BY_SCOPE_NAME     = NO
+
+# The GENERATE_TODOLIST tag can be used to enable (YES) or
+# disable (NO) the todo list. This list is created by putting \todo
+# commands in the documentation.
+
+GENERATE_TODOLIST      = YES
+
+# The GENERATE_TESTLIST tag can be used to enable (YES) or
+# disable (NO) the test list. This list is created by putting \test
+# commands in the documentation.
+
+GENERATE_TESTLIST      = YES
+
+# The GENERATE_BUGLIST tag can be used to enable (YES) or
+# disable (NO) the bug list. This list is created by putting \bug
+# commands in the documentation.
+
+GENERATE_BUGLIST       = YES
+
+# The GENERATE_DEPRECATEDLIST tag can be used to enable (YES) or
+# disable (NO) the deprecated list. This list is created by putting
+# \deprecated commands in the documentation.
+
+GENERATE_DEPRECATEDLIST= YES
+
+# The ENABLED_SECTIONS tag can be used to enable conditional
+# documentation sections, marked by \if sectionname ... \endif.
+
+ENABLED_SECTIONS       =
+
+# The MAX_INITIALIZER_LINES tag determines the maximum number of lines
+# the initial value of a variable or define consists of for it to appear in
+# the documentation. If the initializer consists of more lines than specified
+# here it will be hidden. Use a value of 0 to hide initializers completely.
+# The appearance of the initializer of individual variables and defines in the
+# documentation can be controlled using \showinitializer or \hideinitializer
+# command in the documentation regardless of this setting.
+
+MAX_INITIALIZER_LINES  = 30
+
+# Set the SHOW_USED_FILES tag to NO to disable the list of files generated
+# at the bottom of the documentation of classes and structs. If set to YES the
+# list will mention the files that were used to generate the documentation.
+
+SHOW_USED_FILES        = YES
+
+# If the sources in your project are distributed over multiple directories
+# then setting the SHOW_DIRECTORIES tag to YES will show the directory hierarchy
+# in the documentation. The default is NO.
+
+SHOW_DIRECTORIES       = NO
+
+# Set the SHOW_FILES tag to NO to disable the generation of the Files page.
+# This will remove the Files entry from the Quick Index and from the
+# Folder Tree View (if specified). The default is YES.
+
+SHOW_FILES             = YES
+
+# Set the SHOW_NAMESPACES tag to NO to disable the generation of the
+# Namespaces page.
+# This will remove the Namespaces entry from the Quick Index
+# and from the Folder Tree View (if specified). The default is YES.
+
+SHOW_NAMESPACES        = YES
+
+# The FILE_VERSION_FILTER tag can be used to specify a program or script that
+# doxygen should invoke to get the current version for each file (typically from
+# the version control system). Doxygen will invoke the program by executing (via
+# popen()) the command <command> <input-file>, where <command> is the value of
+# the FILE_VERSION_FILTER tag, and <input-file> is the name of an input file
+# provided by doxygen. Whatever the program writes to standard output
+# is used as the file version. See the manual for examples.
+
+FILE_VERSION_FILTER    =
+
+# The LAYOUT_FILE tag can be used to specify a layout file which will be parsed by
+# doxygen. The layout file controls the global structure of the generated output files
+# in an output format independent way. The create the layout file that represents
+# doxygen's defaults, run doxygen with the -l option. You can optionally specify a
+# file name after the option, if omitted DoxygenLayout.xml will be used as the name
+# of the layout file.
+
+LAYOUT_FILE            =
+
+#---------------------------------------------------------------------------
+# configuration options related to warning and progress messages
+#---------------------------------------------------------------------------
+
+# The QUIET tag can be used to turn on/off the messages that are generated
+# by doxygen. Possible values are YES and NO. If left blank NO is used.
+
+QUIET                  = YES
+
+# The WARNINGS tag can be used to turn on/off the warning messages that are
+# generated by doxygen. Possible values are YES and NO. If left blank
+# NO is used.
+
+WARNINGS               = YES
+
+# If WARN_IF_UNDOCUMENTED is set to YES, then doxygen will generate warnings
+# for undocumented members. If EXTRACT_ALL is set to YES then this flag will
+# automatically be disabled.
+
+WARN_IF_UNDOCUMENTED   = YES
+
+# If WARN_IF_DOC_ERROR is set to YES, doxygen will generate warnings for
+# potential errors in the documentation, such as not documenting some
+# parameters in a documented function, or documenting parameters that
+# don't exist or using markup commands wrongly.
+
+WARN_IF_DOC_ERROR      = YES
+
+# This WARN_NO_PARAMDOC option can be abled to get warnings for
+# functions that are documented, but have no documentation for their parameters
+# or return value. If set to NO (the default) doxygen will only warn about
+# wrong or incomplete parameter documentation, but not about the absence of
+# documentation.
+
+WARN_NO_PARAMDOC       = NO
+
+# The WARN_FORMAT tag determines the format of the warning messages that
+# doxygen can produce. The string should contain the $file, $line, and $text
+# tags, which will be replaced by the file and line number from which the
+# warning originated and the warning text. Optionally the format may contain
+# $version, which will be replaced by the version of the file (if it could
+# be obtained via FILE_VERSION_FILTER)
+
+WARN_FORMAT            = "$file:$line: $text"
+
+# The WARN_LOGFILE tag can be used to specify a file to which warning
+# and error messages should be written. If left blank the output is written
+# to stderr.
+
+WARN_LOGFILE           =
+
+#---------------------------------------------------------------------------
+# configuration options related to the input files
+#---------------------------------------------------------------------------
+
+# The INPUT tag can be used to specify the files and/or directories that contain
+# documented source files. You may enter file names like "myfile.cpp" or
+# directories like "/usr/src/myproject". Separate the files or directories
+# with spaces.
+
+INPUT                  = @srcdir@/.. \
+                         @srcdir@/../input \
+                         @srcdir@/../config
+
+# This tag can be used to specify the character encoding of the source files
+# that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is
+# also the default input encoding. Doxygen uses libiconv (or the iconv built
+# into libc) for the transcoding. See http://www.gnu.org/software/libiconv for
+# the list of possible encodings.
+
+INPUT_ENCODING         = UTF-8
+
+# If the value of the INPUT tag contains directories, you can use the
+# FILE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp
+# and *.h) to filter out the source-files in the directories. If left
+# blank the following patterns are tested:
+# *.c *.cc *.cxx *.cpp *.c++ *.java *.ii *.ixx *.ipp *.i++ *.inl *.h *.hh *.hxx
+# *.hpp *.h++ *.idl *.odl *.cs *.php *.php3 *.inc *.m *.mm *.py *.f90
+
+FILE_PATTERNS          =
+
+# The RECURSIVE tag can be used to turn specify whether or not subdirectories
+# should be searched for input files as well. Possible values are YES and NO.
+# If left blank NO is used.
+
+RECURSIVE              = NO
+
+# The EXCLUDE tag can be used to specify files and/or directories that should
+# excluded from the INPUT source files. This way you can easily exclude a
+# subdirectory from a directory tree whose root is specified with the INPUT tag.
+
+EXCLUDE                = @srcdir@/../config/parser.c \
+                         @srcdir@/../config/parser.h \
+                         @srcdir@/../config/scanner.c
+
+# The EXCLUDE_SYMLINKS tag can be used select whether or not files or
+# directories that are symbolic links (a Unix filesystem feature) are excluded
+# from the input.
+
+EXCLUDE_SYMLINKS       = YES
+
+# If the value of the INPUT tag contains directories, you can use the
+# EXCLUDE_PATTERNS tag to specify one or more wildcard patterns to exclude
+# certain files from those directories. Note that the wildcards are matched
+# against the file with absolute path, so to exclude all test directories
+# for example use the pattern */test/*
+
+EXCLUDE_PATTERNS       = atKeynames.h \
+                         Canvas*.*
+
+# The EXCLUDE_SYMBOLS tag can be used to specify one or more symbol names
+# (namespaces, classes, functions, etc.) that should be excluded from the
+# output. The symbol name can be a fully qualified name, a word, or if the
+# wildcard * is used, a substring. Examples: ANamespace, AClass,
+# AClass::ANamespace, ANamespace::*Test
+
+EXCLUDE_SYMBOLS        =
+
+# The EXAMPLE_PATH tag can be used to specify one or more files or
+# directories that contain example code fragments that are included (see
+# the \include command).
+
+EXAMPLE_PATH           =
+
+# If the value of the EXAMPLE_PATH tag contains directories, you can use the
+# EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp
+# and *.h) to filter out the source-files in the directories. If left
+# blank all files are included.
+
+EXAMPLE_PATTERNS       =
+
+# If the EXAMPLE_RECURSIVE tag is set to YES then subdirectories will be
+# searched for input files to be used with the \include or \dontinclude
+# commands irrespective of the value of the RECURSIVE tag.
+# Possible values are YES and NO. If left blank NO is used.
+
+EXAMPLE_RECURSIVE      = NO
+
+# The IMAGE_PATH tag can be used to specify one or more files or
+# directories that contain image that are included in the documentation (see
+# the \image command).
+
+IMAGE_PATH             =
+
+# The INPUT_FILTER tag can be used to specify a program that doxygen should
+# invoke to filter for each input file. Doxygen will invoke the filter program
+# by executing (via popen()) the command <filter> <input-file>, where <filter>
+# is the value of the INPUT_FILTER tag, and <input-file> is the name of an
+# input file. Doxygen will then use the output that the filter program writes
+# to standard output.
+# If FILTER_PATTERNS is specified, this tag will be
+# ignored.
+
+INPUT_FILTER           =
+
+# The FILTER_PATTERNS tag can be used to specify filters on a per file pattern
+# basis.
+# Doxygen will compare the file name with each pattern and apply the
+# filter if there is a match.
+# The filters are a list of the form:
+# pattern=filter (like *.cpp=my_cpp_filter). See INPUT_FILTER for further
+# info on how filters are used. If FILTER_PATTERNS is empty, INPUT_FILTER
+# is applied to all files.
+
+FILTER_PATTERNS        =
+
+# If the FILTER_SOURCE_FILES tag is set to YES, the input filter (if set using
+# INPUT_FILTER) will be used to filter the input files when producing source
+# files to browse (i.e. when SOURCE_BROWSER is set to YES).
+
+FILTER_SOURCE_FILES    = NO
+
+#---------------------------------------------------------------------------
+# configuration options related to source browsing
+#---------------------------------------------------------------------------
+
+# If the SOURCE_BROWSER tag is set to YES then a list of source files will
+# be generated. Documented entities will be cross-referenced with these sources.
+# Note: To get rid of all source code in the generated output, make sure also
+# VERBATIM_HEADERS is set to NO.
+
+SOURCE_BROWSER         = NO
+
+# Setting the INLINE_SOURCES tag to YES will include the body
+# of functions and classes directly in the documentation.
+
+INLINE_SOURCES         = NO
+
+# Setting the STRIP_CODE_COMMENTS tag to YES (the default) will instruct
+# doxygen to hide any special comment blocks from generated source code
+# fragments. Normal C and C++ comments will always remain visible.
+
+STRIP_CODE_COMMENTS    = YES
+
+# If the REFERENCED_BY_RELATION tag is set to YES
+# then for each documented function all documented
+# functions referencing it will be listed.
+
+REFERENCED_BY_RELATION = YES
+
+# If the REFERENCES_RELATION tag is set to YES
+# then for each documented function all documented entities
+# called/used by that function will be listed.
+
+REFERENCES_RELATION    = YES
+
+# If the REFERENCES_LINK_SOURCE tag is set to YES (the default)
+# and SOURCE_BROWSER tag is set to YES, then the hyperlinks from
+# functions in REFERENCES_RELATION and REFERENCED_BY_RELATION lists will
+# link to the source code.
+# Otherwise they will link to the documentation.
+
+REFERENCES_LINK_SOURCE = YES
+
+# If the USE_HTAGS tag is set to YES then the references to source code
+# will point to the HTML generated by the htags(1) tool instead of doxygen
+# built-in source browser. The htags tool is part of GNU's global source
+# tagging system (see http://www.gnu.org/software/global/global.html). You
+# will need version 4.8.6 or higher.
+
+USE_HTAGS              = NO
+
+# If the VERBATIM_HEADERS tag is set to YES (the default) then Doxygen
+# will generate a verbatim copy of the header file for each class for
+# which an include is specified. Set to NO to disable this.
+
+VERBATIM_HEADERS       = YES
+
+#---------------------------------------------------------------------------
+# configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
+
+# If the ALPHABETICAL_INDEX tag is set to YES, an alphabetical index
+# of all compounds will be generated. Enable this if the project
+# contains a lot of classes, structs, unions or interfaces.
+
+ALPHABETICAL_INDEX     = YES
+
+# If the alphabetical index is enabled (see ALPHABETICAL_INDEX) then
+# the COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns
+# in which this list will be split (can be a number in the range [1..20])
+
+COLS_IN_ALPHA_INDEX    = 5
+
+# In case all classes in a project start with a common prefix, all
+# classes will be put under the same header in the alphabetical index.
+# The IGNORE_PREFIX tag can be used to specify one or more prefixes that
+# should be ignored while generating the index headers.
+
+IGNORE_PREFIX          =
+
+#---------------------------------------------------------------------------
+# configuration options related to the HTML output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_HTML tag is set to YES (the default) Doxygen will
+# generate HTML output.
+
+GENERATE_HTML          = YES
+
+# The HTML_OUTPUT tag is used to specify where the HTML docs will be put.
+# If a relative path is entered the value of OUTPUT_DIRECTORY will be
+# put in front of it. If left blank `html' will be used as the default path.
+
+HTML_OUTPUT            = html
+
+# The HTML_FILE_EXTENSION tag can be used to specify the file extension for
+# each generated HTML page (for example: .htm,.php,.asp). If it is left blank
+# doxygen will generate files with .html extension.
+
+HTML_FILE_EXTENSION    = .html
+
+# The HTML_HEADER tag can be used to specify a personal HTML header for
+# each generated HTML page. If it is left blank doxygen will generate a
+# standard header.
+
+HTML_HEADER            =
+
+# The HTML_FOOTER tag can be used to specify a personal HTML footer for
+# each generated HTML page. If it is left blank doxygen will generate a
+# standard footer.
+
+HTML_FOOTER            = @srcdir@/footer.html
+
+# The HTML_STYLESHEET tag can be used to specify a user-defined cascading
+# style sheet that is used by each HTML page. It can be used to
+# fine-tune the look of the HTML output. If the tag is left blank doxygen
+# will generate a default style sheet. Note that doxygen will try to copy
+# the style sheet file to the HTML output directory, so don't put your own
+# stylesheet in the HTML output directory as well, or it will be erased!
+
+HTML_STYLESHEET        =
+
+# If the HTML_TIMESTAMP tag is set to YES then the footer of each generated HTML
+# page will contain the date and time when the page was generated. Setting
+# this to NO can help when comparing the output of multiple runs.
+
+HTML_TIMESTAMP         = NO
+
+# If the HTML_ALIGN_MEMBERS tag is set to YES, the members of classes,
+# files or namespaces will be aligned in HTML using tables. If set to
+# NO a bullet list will be used.
+
+HTML_ALIGN_MEMBERS     = YES
+
+# If the HTML_DYNAMIC_SECTIONS tag is set to YES then the generated HTML
+# documentation will contain sections that can be hidden and shown after the
+# page has loaded. For this to work a browser that supports
+# JavaScript and DHTML is required (for instance Mozilla 1.0+, Firefox
+# Netscape 6.0+, Internet explorer 5.0+, Konqueror, or Safari).
+
+HTML_DYNAMIC_SECTIONS  = NO
+
+# If the GENERATE_DOCSET tag is set to YES, additional index files
+# will be generated that can be used as input for Apple's Xcode 3
+# integrated development environment, introduced with OSX 10.5 (Leopard).
+# To create a documentation set, doxygen will generate a Makefile in the
+# HTML output directory. Running make will produce the docset in that
+# directory and running "make install" will install the docset in
+# ~/Library/Developer/Shared/Documentation/DocSets so that Xcode will find
+# it at startup.
+# See http://developer.apple.com/tools/creatingdocsetswithdoxygen.html for more information.
+
+GENERATE_DOCSET        = NO
+
+# When GENERATE_DOCSET tag is set to YES, this tag determines the name of the
+# feed. A documentation feed provides an umbrella under which multiple
+# documentation sets from a single provider (such as a company or product suite)
+# can be grouped.
+
+DOCSET_FEEDNAME        = "Doxygen generated docs"
+
+# When GENERATE_DOCSET tag is set to YES, this tag specifies a string that
+# should uniquely identify the documentation set bundle. This should be a
+# reverse domain-name style string, e.g. com.mycompany.MyDocSet. Doxygen
+# will append .docset to the name.
+
+DOCSET_BUNDLE_ID       = org.doxygen.Project
+
+# If the GENERATE_HTMLHELP tag is set to YES, additional index files
+# will be generated that can be used as input for tools like the
+# Microsoft HTML help workshop to generate a compiled HTML help file (.chm)
+# of the generated HTML documentation.
+
+GENERATE_HTMLHELP      = NO
+
+# If the GENERATE_HTMLHELP tag is set to YES, the CHM_FILE tag can
+# be used to specify the file name of the resulting .chm file. You
+# can add a path in front of the file if the result should not be
+# written to the html output directory.
+
+CHM_FILE               =
+
+# If the GENERATE_HTMLHELP tag is set to YES, the HHC_LOCATION tag can
+# be used to specify the location (absolute path including file name) of
+# the HTML help compiler (hhc.exe). If non-empty doxygen will try to run
+# the HTML help compiler on the generated index.hhp.
+
+HHC_LOCATION           =
+
+# If the GENERATE_HTMLHELP tag is set to YES, the GENERATE_CHI flag
+# controls if a separate .chi index file is generated (YES) or that
+# it should be included in the master .chm file (NO).
+
+GENERATE_CHI           = NO
+
+# If the GENERATE_HTMLHELP tag is set to YES, the CHM_INDEX_ENCODING
+# is used to encode HtmlHelp index (hhk), content (hhc) and project file
+# content.
+
+CHM_INDEX_ENCODING     =
+
+# If the GENERATE_HTMLHELP tag is set to YES, the BINARY_TOC flag
+# controls whether a binary table of contents is generated (YES) or a
+# normal table of contents (NO) in the .chm file.
+
+BINARY_TOC             = NO
+
+# The TOC_EXPAND flag can be set to YES to add extra items for group members
+# to the contents of the HTML help documentation and to the tree view.
+
+TOC_EXPAND             = NO
+
+# If the GENERATE_QHP tag is set to YES and both QHP_NAMESPACE and QHP_VIRTUAL_FOLDER
+# are set, an additional index file will be generated that can be used as input for
+# Qt's qhelpgenerator to generate a Qt Compressed Help (.qch) of the generated
+# HTML documentation.
+
+GENERATE_QHP           = NO
+
+# If the QHG_LOCATION tag is specified, the QCH_FILE tag can
+# be used to specify the file name of the resulting .qch file.
+# The path specified is relative to the HTML output folder.
+
+QCH_FILE               =
+
+# The QHP_NAMESPACE tag specifies the namespace to use when generating
+# Qt Help Project output. For more information please see
+# http://doc.trolltech.com/qthelpproject.html#namespace
+
+QHP_NAMESPACE          = org.doxygen.Project
+
+# The QHP_VIRTUAL_FOLDER tag specifies the namespace to use when generating
+# Qt Help Project output. For more information please see
+# http://doc.trolltech.com/qthelpproject.html#virtual-folders
+
+QHP_VIRTUAL_FOLDER     = doc
+
+# If QHP_CUST_FILTER_NAME is set, it specifies the name of a custom filter to add.
+# For more information please see
+# http://doc.trolltech.com/qthelpproject.html#custom-filters
+
+QHP_CUST_FILTER_NAME   =
+
+# The QHP_CUST_FILT_ATTRS tag specifies the list of the attributes of the custom filter to add.For more information please see
+# <a href="http://doc.trolltech.com/qthelpproject.html#custom-filters">Qt Help Project / Custom Filters</a>.
+
+QHP_CUST_FILTER_ATTRS  =
+
+# The QHP_SECT_FILTER_ATTRS tag specifies the list of the attributes this project's
+# filter section matches.
+# <a href="http://doc.trolltech.com/qthelpproject.html#filter-attributes">Qt Help Project / Filter Attributes</a>.
+
+QHP_SECT_FILTER_ATTRS  =
+
+# If the GENERATE_QHP tag is set to YES, the QHG_LOCATION tag can
+# be used to specify the location of Qt's qhelpgenerator.
+# If non-empty doxygen will try to run qhelpgenerator on the generated
+# .qhp file.
+
+QHG_LOCATION           =
+
+# If the GENERATE_ECLIPSEHELP tag is set to YES, additional index files
+#  will be generated, which together with the HTML files, form an Eclipse help
+#  plugin. To install this plugin and make it available under the help contents
+# menu in Eclipse, the contents of the directory containing the HTML and XML
+# files needs to be copied into the plugins directory of eclipse. The name of
+# the directory within the plugins directory should be the same as
+# the ECLIPSE_DOC_ID value. After copying Eclipse needs to be restarted before the help appears.
+
+GENERATE_ECLIPSEHELP   = NO
+
+# A unique identifier for the eclipse help plugin. When installing the plugin
+# the directory name containing the HTML and XML files should also have
+# this name.
+
+ECLIPSE_DOC_ID         = org.doxygen.Project
+
+# The DISABLE_INDEX tag can be used to turn on/off the condensed index at
+# top of each HTML page. The value NO (the default) enables the index and
+# the value YES disables it.
+
+DISABLE_INDEX          = NO
+
+# This tag can be used to set the number of enum values (range [1..20])
+# that doxygen will group on one line in the generated HTML documentation.
+
+ENUM_VALUES_PER_LINE   = 4
+
+# The GENERATE_TREEVIEW tag is used to specify whether a tree-like index
+# structure should be generated to display hierarchical information.
+# If the tag value is set to YES, a side panel will be generated
+# containing a tree-like index structure (just like the one that
+# is generated for HTML Help). For this to work a browser that supports
+# JavaScript, DHTML, CSS and frames is required (i.e. any modern browser).
+# Windows users are probably better off using the HTML help feature.
+
+GENERATE_TREEVIEW      = YES
+
+# By enabling USE_INLINE_TREES, doxygen will generate the Groups, Directories,
+# and Class Hierarchy pages using a tree view instead of an ordered list.
+
+USE_INLINE_TREES       = NO
+
+# If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be
+# used to set the initial width (in pixels) of the frame in which the tree
+# is shown.
+
+TREEVIEW_WIDTH         = 250
+
+# Use this tag to change the font size of Latex formulas included
+# as images in the HTML documentation. The default is 10. Note that
+# when you change the font size after a successful doxygen run you need
+# to manually remove any form_*.png images from the HTML output directory
+# to force them to be regenerated.
+
+FORMULA_FONTSIZE       = 10
+
+# When the SEARCHENGINE tag is enabled doxygen will generate a search box for the HTML output. The underlying search engine uses javascript
+# and DHTML and should work on any modern browser. Note that when using HTML help (GENERATE_HTMLHELP), Qt help (GENERATE_QHP), or docsets (GENERATE_DOCSET) there is already a search function so this one should
+# typically be disabled. For large projects the javascript based search engine
+# can be slow, then enabling SERVER_BASED_SEARCH may provide a better solution.
+
+SEARCHENGINE           = NO
+
+# When the SERVER_BASED_SEARCH tag is enabled the search engine will be implemented using a PHP enabled web server instead of at the web client using Javascript. Doxygen will generate the search PHP script and index
+# file to put on the web server. The advantage of the server based approach is that it scales better to large projects and allows full text search. The disadvances is that it is more difficult to setup
+# and does not have live searching capabilities.
+
+SERVER_BASED_SEARCH    = NO
+
+#---------------------------------------------------------------------------
+# configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_LATEX tag is set to YES (the default) Doxygen will
+# generate Latex output.
+
+GENERATE_LATEX         = NO
+
+# The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put.
+# If a relative path is entered the value of OUTPUT_DIRECTORY will be
+# put in front of it. If left blank `latex' will be used as the default path.
+
+LATEX_OUTPUT           = latex
+
+# The LATEX_CMD_NAME tag can be used to specify the LaTeX command name to be
+# invoked. If left blank `latex' will be used as the default command name.
+# Note that when enabling USE_PDFLATEX this option is only used for
+# generating bitmaps for formulas in the HTML output, but not in the
+# Makefile that is written to the output directory.
+
+LATEX_CMD_NAME         = latex
+
+# The MAKEINDEX_CMD_NAME tag can be used to specify the command name to
+# generate index for LaTeX. If left blank `makeindex' will be used as the
+# default command name.
+
+MAKEINDEX_CMD_NAME     = makeindex
+
+# If the COMPACT_LATEX tag is set to YES Doxygen generates more compact
+# LaTeX documents. This may be useful for small projects and may help to
+# save some trees in general.
+
+COMPACT_LATEX          = NO
+
+# The PAPER_TYPE tag can be used to set the paper type that is used
+# by the printer. Possible values are: a4, a4wide, letter, legal and
+# executive. If left blank a4wide will be used.
+
+PAPER_TYPE             = a4wide
+
+# The EXTRA_PACKAGES tag can be to specify one or more names of LaTeX
+# packages that should be included in the LaTeX output.
+
+EXTRA_PACKAGES         =
+
+# The LATEX_HEADER tag can be used to specify a personal LaTeX header for
+# the generated latex document. The header should contain everything until
+# the first chapter. If it is left blank doxygen will generate a
+# standard header. Notice: only use this tag if you know what you are doing!
+
+LATEX_HEADER           =
+
+# If the PDF_HYPERLINKS tag is set to YES, the LaTeX that is generated
+# is prepared for conversion to pdf (using ps2pdf). The pdf file will
+# contain links (just like the HTML output) instead of page references
+# This makes the output suitable for online browsing using a pdf viewer.
+
+PDF_HYPERLINKS         = NO
+
+# If the USE_PDFLATEX tag is set to YES, pdflatex will be used instead of
+# plain latex in the generated Makefile. Set this option to YES to get a
+# higher quality PDF documentation.
+
+USE_PDFLATEX           = NO
+
+# If the LATEX_BATCHMODE tag is set to YES, doxygen will add the \\batchmode.
+# command to the generated LaTeX files. This will instruct LaTeX to keep
+# running if errors occur, instead of asking the user for help.
+# This option is also used when generating formulas in HTML.
+
+LATEX_BATCHMODE        = NO
+
+# If LATEX_HIDE_INDICES is set to YES then doxygen will not
+# include the index chapters (such as File Index, Compound Index, etc.)
+# in the output.
+
+LATEX_HIDE_INDICES     = NO
+
+# If LATEX_SOURCE_CODE is set to YES then doxygen will include source code with syntax highlighting in the LaTeX output. Note that which sources are shown also depends on other settings such as SOURCE_BROWSER.
+
+LATEX_SOURCE_CODE      = NO
+
+#---------------------------------------------------------------------------
+# configuration options related to the RTF output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_RTF tag is set to YES Doxygen will generate RTF output
+# The RTF output is optimized for Word 97 and may not look very pretty with
+# other RTF readers or editors.
+
+GENERATE_RTF           = NO
+
+# The RTF_OUTPUT tag is used to specify where the RTF docs will be put.
+# If a relative path is entered the value of OUTPUT_DIRECTORY will be
+# put in front of it. If left blank `rtf' will be used as the default path.
+
+RTF_OUTPUT             = rtf
+
+# If the COMPACT_RTF tag is set to YES Doxygen generates more compact
+# RTF documents. This may be useful for small projects and may help to
+# save some trees in general.
+
+COMPACT_RTF            = NO
+
+# If the RTF_HYPERLINKS tag is set to YES, the RTF that is generated
+# will contain hyperlink fields. The RTF file will
+# contain links (just like the HTML output) instead of page references.
+# This makes the output suitable for online browsing using WORD or other
+# programs which support those fields.
+# Note: wordpad (write) and others do not support links.
+
+RTF_HYPERLINKS         = NO
+
+# Load stylesheet definitions from file. Syntax is similar to doxygen's
+# config file, i.e. a series of assignments. You only have to provide
+# replacements, missing definitions are set to their default value.
+
+RTF_STYLESHEET_FILE    =
+
+# Set optional variables used in the generation of an rtf document.
+# Syntax is similar to doxygen's config file.
+
+RTF_EXTENSIONS_FILE    =
+
+#---------------------------------------------------------------------------
+# configuration options related to the man page output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_MAN tag is set to YES (the default) Doxygen will
+# generate man pages
+
+GENERATE_MAN           = NO
+
+# The MAN_OUTPUT tag is used to specify where the man pages will be put.
+# If a relative path is entered the value of OUTPUT_DIRECTORY will be
+# put in front of it. If left blank `man' will be used as the default path.
+
+MAN_OUTPUT             = man
+
+# The MAN_EXTENSION tag determines the extension that is added to
+# the generated man pages (default is the subroutine's section .3)
+
+MAN_EXTENSION          = .3
+
+# If the MAN_LINKS tag is set to YES and Doxygen generates man output,
+# then it will generate one additional man file for each entity
+# documented in the real man page(s). These additional files
+# only source the real man page, but without them the man command
+# would be unable to find the correct page. The default is NO.
+
+MAN_LINKS              = NO
+
+#---------------------------------------------------------------------------
+# configuration options related to the XML output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_XML tag is set to YES Doxygen will
+# generate an XML file that captures the structure of
+# the code including all documentation.
+
+GENERATE_XML           = NO
+
+# The XML_OUTPUT tag is used to specify where the XML pages will be put.
+# If a relative path is entered the value of OUTPUT_DIRECTORY will be
+# put in front of it. If left blank `xml' will be used as the default path.
+
+XML_OUTPUT             = xml
+
+# The XML_SCHEMA tag can be used to specify an XML schema,
+# which can be used by a validating XML parser to check the
+# syntax of the XML files.
+
+XML_SCHEMA             =
+
+# The XML_DTD tag can be used to specify an XML DTD,
+# which can be used by a validating XML parser to check the
+# syntax of the XML files.
+
+XML_DTD                =
+
+# If the XML_PROGRAMLISTING tag is set to YES Doxygen will
+# dump the program listings (including syntax highlighting
+# and cross-referencing information) to the XML output. Note that
+# enabling this will significantly increase the size of the XML output.
+
+XML_PROGRAMLISTING     = YES
+
+#---------------------------------------------------------------------------
+# configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_AUTOGEN_DEF tag is set to YES Doxygen will
+# generate an AutoGen Definitions (see autogen.sf.net) file
+# that captures the structure of the code including all
+# documentation. Note that this feature is still experimental
+# and incomplete at the moment.
+
+GENERATE_AUTOGEN_DEF   = NO
+
+#---------------------------------------------------------------------------
+# configuration options related to the Perl module output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_PERLMOD tag is set to YES Doxygen will
+# generate a Perl module file that captures the structure of
+# the code including all documentation. Note that this
+# feature is still experimental and incomplete at the
+# moment.
+
+GENERATE_PERLMOD       = NO
+
+# If the PERLMOD_LATEX tag is set to YES Doxygen will generate
+# the necessary Makefile rules, Perl scripts and LaTeX code to be able
+# to generate PDF and DVI output from the Perl module output.
+
+PERLMOD_LATEX          = NO
+
+# If the PERLMOD_PRETTY tag is set to YES the Perl module output will be
+# nicely formatted so it can be parsed by a human reader.
+# This is useful
+# if you want to understand what is going on.
+# On the other hand, if this
+# tag is set to NO the size of the Perl module output will be much smaller
+# and Perl will parse it just the same.
+
+PERLMOD_PRETTY         = YES
+
+# The names of the make variables in the generated doxyrules.make file
+# are prefixed with the string contained in PERLMOD_MAKEVAR_PREFIX.
+# This is useful so different doxyrules.make files included by the same
+# Makefile don't overwrite each other's variables.
+
+PERLMOD_MAKEVAR_PREFIX =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor
+#---------------------------------------------------------------------------
+
+# If the ENABLE_PREPROCESSING tag is set to YES (the default) Doxygen will
+# evaluate all C-preprocessor directives found in the sources and include
+# files.
+
+ENABLE_PREPROCESSING   = YES
+
+# If the MACRO_EXPANSION tag is set to YES Doxygen will expand all macro
+# names in the source code. If set to NO (the default) only conditional
+# compilation will be performed. Macro expansion can be done in a controlled
+# way by setting EXPAND_ONLY_PREDEF to YES.
+
+MACRO_EXPANSION        = NO
+
+# If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES
+# then the macro expansion is limited to the macros specified with the
+# PREDEFINED and EXPAND_AS_DEFINED tags.
+
+EXPAND_ONLY_PREDEF     = NO
+
+# If the SEARCH_INCLUDES tag is set to YES (the default) the includes files
+# in the INCLUDE_PATH (see below) will be search if a #include is found.
+
+SEARCH_INCLUDES        = YES
+
+# The INCLUDE_PATH tag can be used to specify one or more directories that
+# contain include files that are not input files but should be processed by
+# the preprocessor.
+
+INCLUDE_PATH           =
+
+# You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard
+# patterns (like *.h and *.hpp) to filter out the header-files in the
+# directories. If left blank, the patterns specified with FILE_PATTERNS will
+# be used.
+
+INCLUDE_FILE_PATTERNS  =
+
+# The PREDEFINED tag can be used to specify one or more macro names that
+# are defined before the preprocessor is started (similar to the -D option of
+# gcc). The argument of the tag is a list of macros of the form: name
+# or name=definition (no spaces). If the definition and the = are
+# omitted =1 is assumed. To prevent a macro definition from being
+# undefined via #undef or recursively expanded use the := operator
+# instead of the = operator.
+
+PREDEFINED             = SHAPE \
+                         RENDER \
+                         XKB \
+                         XINPUT
+
+# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then
+# this tag can be used to specify a list of macro names that should be expanded.
+# The macro definition that is found in the sources will be used.
+# Use the PREDEFINED tag if you want to use a different macro definition.
+
+EXPAND_AS_DEFINED      =
+
+# If the SKIP_FUNCTION_MACROS tag is set to YES (the default) then
+# doxygen's preprocessor will remove all function-like macros that are alone
+# on a line, have an all uppercase name, and do not end with a semicolon. Such
+# function macros are typically used for boiler-plate code, and will confuse
+# the parser if not removed.
+
+SKIP_FUNCTION_MACROS   = YES
+
+#---------------------------------------------------------------------------
+# Configuration::additions related to external references
+#---------------------------------------------------------------------------
+
+# The TAGFILES option can be used to specify one or more tagfiles.
+# Optionally an initial location of the external documentation
+# can be added for each tagfile. The format of a tag file without
+# this location is as follows:
+#
+# TAGFILES = file1 file2 ...
+# Adding location for the tag files is done as follows:
+#
+# TAGFILES = file1=loc1 "file2 = loc2" ...
+# where "loc1" and "loc2" can be relative or absolute paths or
+# URLs. If a location is present for each tag, the installdox tool
+# does not have to be run to correct the links.
+# Note that each tag file must have a unique name
+# (where the name does NOT include the path)
+# If a tag file is not located in the directory in which doxygen
+# is run, you must also specify the path to the tagfile here.
+
+TAGFILES               =
+
+# When a file name is specified after GENERATE_TAGFILE, doxygen will create
+# a tag file that is based on the input files it reads.
+
+GENERATE_TAGFILE       =
+
+# If the ALLEXTERNALS tag is set to YES all external classes will be listed
+# in the class index. If set to NO only the inherited external classes
+# will be listed.
+
+ALLEXTERNALS           = NO
+
+# If the EXTERNAL_GROUPS tag is set to YES all external groups will be listed
+# in the modules index. If set to NO, only the current project's groups will
+# be listed.
+
+EXTERNAL_GROUPS        = YES
+
+# The PERL_PATH should be the absolute path and name of the perl script
+# interpreter (i.e. the result of `which perl').
+
+PERL_PATH              = /usr/bin/perl
+
+#---------------------------------------------------------------------------
+# Configuration options related to the dot tool
+#---------------------------------------------------------------------------
+
+# If the CLASS_DIAGRAMS tag is set to YES (the default) Doxygen will
+# generate a inheritance diagram (in HTML, RTF and LaTeX) for classes with base
+# or super classes. Setting the tag to NO turns the diagrams off. Note that
+# this option is superseded by the HAVE_DOT option below. This is only a
+# fallback. It is recommended to install and use dot, since it yields more
+# powerful graphs.
+
+CLASS_DIAGRAMS         = YES
+
+# You can define message sequence charts within doxygen comments using the \msc
+# command. Doxygen will then run the mscgen tool (see
+# http://www.mcternan.me.uk/mscgen/) to produce the chart and insert it in the
+# documentation. The MSCGEN_PATH tag allows you to specify the directory where
+# the mscgen tool resides. If left empty the tool is assumed to be found in the
+# default search path.
+
+MSCGEN_PATH            =
+
+# If set to YES, the inheritance and collaboration graphs will hide
+# inheritance and usage relations if the target is undocumented
+# or is not a class.
+
+HIDE_UNDOC_RELATIONS   = YES
+
+# If you set the HAVE_DOT tag to YES then doxygen will assume the dot tool is
+# available from the path. This tool is part of Graphviz, a graph visualization
+# toolkit from AT&T and Lucent Bell Labs. The other options in this section
+# have no effect if this option is set to NO (the default)
+
+HAVE_DOT               = NO
+
+# By default doxygen will write a font called FreeSans.ttf to the output
+# directory and reference it in all dot files that doxygen generates. This
+# font does not include all possible unicode characters however, so when you need
+# these (or just want a differently looking font) you can specify the font name
+# using DOT_FONTNAME. You need need to make sure dot is able to find the font,
+# which can be done by putting it in a standard location or by setting the
+# DOTFONTPATH environment variable or by setting DOT_FONTPATH to the directory
+# containing the font.
+
+DOT_FONTNAME           = FreeSans
+
+# The DOT_FONTSIZE tag can be used to set the size of the font of dot graphs.
+# The default size is 10pt.
+
+DOT_FONTSIZE           = 10
+
+# By default doxygen will tell dot to use the output directory to look for the
+# FreeSans.ttf font (which doxygen will put there itself). If you specify a
+# different font using DOT_FONTNAME you can set the path where dot
+# can find it using this tag.
+
+DOT_FONTPATH           =
+
+# If the CLASS_GRAPH and HAVE_DOT tags are set to YES then doxygen
+# will generate a graph for each documented class showing the direct and
+# indirect inheritance relations. Setting this tag to YES will force the
+# the CLASS_DIAGRAMS tag to NO.
+
+CLASS_GRAPH            = YES
+
+# If the COLLABORATION_GRAPH and HAVE_DOT tags are set to YES then doxygen
+# will generate a graph for each documented class showing the direct and
+# indirect implementation dependencies (inheritance, containment, and
+# class references variables) of the class with other documented classes.
+
+COLLABORATION_GRAPH    = YES
+
+# If the GROUP_GRAPHS and HAVE_DOT tags are set to YES then doxygen
+# will generate a graph for groups, showing the direct groups dependencies
+
+GROUP_GRAPHS           = YES
+
+# If the UML_LOOK tag is set to YES doxygen will generate inheritance and
+# collaboration diagrams in a style similar to the OMG's Unified Modeling
+# Language.
+
+UML_LOOK               = NO
+
+# If set to YES, the inheritance and collaboration graphs will show the
+# relations between templates and their instances.
+
+TEMPLATE_RELATIONS     = YES
+
+# If the ENABLE_PREPROCESSING, SEARCH_INCLUDES, INCLUDE_GRAPH, and HAVE_DOT
+# tags are set to YES then doxygen will generate a graph for each documented
+# file showing the direct and indirect include dependencies of the file with
+# other documented files.
+
+INCLUDE_GRAPH          = YES
+
+# If the ENABLE_PREPROCESSING, SEARCH_INCLUDES, INCLUDED_BY_GRAPH, and
+# HAVE_DOT tags are set to YES then doxygen will generate a graph for each
+# documented header file showing the documented files that directly or
+# indirectly include this file.
+
+INCLUDED_BY_GRAPH      = YES
+
+# If the CALL_GRAPH and HAVE_DOT options are set to YES then
+# doxygen will generate a call dependency graph for every global function
+# or class method. Note that enabling this option will significantly increase
+# the time of a run. So in most cases it will be better to enable call graphs
+# for selected functions only using the \callgraph command.
+
+CALL_GRAPH             = NO
+
+# If the CALLER_GRAPH and HAVE_DOT tags are set to YES then
+# doxygen will generate a caller dependency graph for every global function
+# or class method. Note that enabling this option will significantly increase
+# the time of a run. So in most cases it will be better to enable caller
+# graphs for selected functions only using the \callergraph command.
+
+CALLER_GRAPH           = NO
+
+# If the GRAPHICAL_HIERARCHY and HAVE_DOT tags are set to YES then doxygen
+# will graphical hierarchy of all classes instead of a textual one.
+
+GRAPHICAL_HIERARCHY    = YES
+
+# If the DIRECTORY_GRAPH, SHOW_DIRECTORIES and HAVE_DOT tags are set to YES
+# then doxygen will show the dependencies a directory has on other directories
+# in a graphical way. The dependency relations are determined by the #include
+# relations between the files in the directories.
+
+DIRECTORY_GRAPH        = YES
+
+# The DOT_IMAGE_FORMAT tag can be used to set the image format of the images
+# generated by dot. Possible values are png, jpg, or gif
+# If left blank png will be used.
+
+DOT_IMAGE_FORMAT       = gif
+
+# The tag DOT_PATH can be used to specify the path where the dot tool can be
+# found. If left blank, it is assumed the dot tool can be found in the path.
+
+DOT_PATH               =
+
+# The DOTFILE_DIRS tag can be used to specify one or more directories that
+# contain dot files that are included in the documentation (see the
+# \dotfile command).
+
+DOTFILE_DIRS           =
+
+# The DOT_GRAPH_MAX_NODES tag can be used to set the maximum number of
+# nodes that will be shown in the graph. If the number of nodes in a graph
+# becomes larger than this value, doxygen will truncate the graph, which is
+# visualized by representing a node as a red box. Note that doxygen if the
+# number of direct children of the root node in a graph is already larger than
+# DOT_GRAPH_MAX_NODES then the graph will not be shown at all. Also note
+# that the size of a graph can be further restricted by MAX_DOT_GRAPH_DEPTH.
+
+DOT_GRAPH_MAX_NODES    = 50
+
+# The MAX_DOT_GRAPH_DEPTH tag can be used to set the maximum depth of the
+# graphs generated by dot. A depth value of 3 means that only nodes reachable
+# from the root by following a path via at most 3 edges will be shown. Nodes
+# that lay further from the root node will be omitted. Note that setting this
+# option to 1 or 2 may greatly reduce the computation time needed for large
+# code bases. Also note that the size of a graph can be further restricted by
+# DOT_GRAPH_MAX_NODES. Using a depth of 0 means no depth restriction.
+
+MAX_DOT_GRAPH_DEPTH    = 0
+
+# Set the DOT_TRANSPARENT tag to YES to generate images with a transparent
+# background. This is disabled by default, because dot on Windows does not
+# seem to support this out of the box. Warning: Depending on the platform used,
+# enabling this option may lead to badly anti-aliased labels on the edges of
+# a graph (i.e. they become hard to read).
+
+DOT_TRANSPARENT        = NO
+
+# Set the DOT_MULTI_TARGETS tag to YES allow dot to generate multiple output
+# files in one run (i.e. multiple -o and -T options on the command line). This
+# makes dot run faster, but since only newer versions of dot (>1.8.10)
+# support this, this feature is disabled by default.
+
+DOT_MULTI_TARGETS      = YES
+
+# If the GENERATE_LEGEND tag is set to YES (the default) Doxygen will
+# generate a legend page explaining the meaning of the various boxes and
+# arrows in the dot generated graphs.
+
+GENERATE_LEGEND        = YES
+
+# If the DOT_CLEANUP tag is set to YES (the default) Doxygen will
+# remove the intermediate dot files that are used to generate
+# the various graphs.
+
+DOT_CLEANUP            = YES
diff --git a/xorg-server/hw/dmx/doxygen/footer.html b/xorg-server/hw/dmx/doxygen/footer.html
new file mode 100644
index 000000000..f80dc8269
--- /dev/null
+++ b/xorg-server/hw/dmx/doxygen/footer.html
@@ -0,0 +1,4 @@
+<hr size="1"/><address style="text-align: right;"><small>
+Generated on $datetime for $projectname by&nbsp;<a href="http://www.doxygen.org/index.html"><img class="footer" src="doxygen.png" alt="doxygen"/></a> $doxygenversion</small></address>
+</body>
+</html>
diff --git a/xorg-server/hw/dmx/input/dmxevents.c b/xorg-server/hw/dmx/input/dmxevents.c
index 15d80f5bb..41bc4bf2d 100644
--- a/xorg-server/hw/dmx/input/dmxevents.c
+++ b/xorg-server/hw/dmx/input/dmxevents.c
@@ -176,19 +176,15 @@ static void enqueueMotion(DevicePtr pDev, int x, int y)
 {
     GETDMXLOCALFROMPDEV;
     DeviceIntPtr p = dmxLocal->pDevice;
-    int i, nevents, valuators[3];
-    EventListPtr events;
+    int valuators[3];
     int detail = 0;  /* XXX should this be mask of pressed buttons? */
     ValuatorMask mask;
     valuators[0] = x;
     valuators[1] = y;
 
     valuator_mask_set_range(&mask, 0, 2, valuators);
-    GetEventList(&events);
-    nevents = GetPointerEvents(events, p, MotionNotify, detail,
-                               POINTER_ABSOLUTE | POINTER_SCREEN, &mask);
-    for (i = 0; i < nevents; i++)
-       mieqEnqueue(p, (InternalEvent*)(events + i)->event);
+    QueuePointerEvents(p, MotionNotify, detail,
+                       POINTER_ABSOLUTE | POINTER_SCREEN, &mask);
     return;
 }
 
@@ -291,10 +287,7 @@ static void dmxExtMotion(DMXLocalInputInfoPtr dmxLocal,
     deviceValuator         *xv     = (deviceValuator *)xev+1;
     int                    thisX   = 0;
     int                    thisY   = 0;
-    int                    i;
     int                    count;
-    EventListPtr           events;
-    int                    nevents;
     ValuatorMask           mask;
 
     memset(xE, 0, sizeof(xE));
@@ -348,6 +341,7 @@ static void dmxExtMotion(DMXLocalInputInfoPtr dmxLocal,
             }
             count              = 2;
     } else {
+        int i;
         for (i = 0, count = 0; i < axesCount; i += 6) {
             xev->time          = GetTimeInMillis();
             xev->type          = DeviceMotionNotify;
@@ -375,11 +369,8 @@ static void dmxExtMotion(DMXLocalInputInfoPtr dmxLocal,
     if (block)
         dmxSigioBlock();
     valuator_mask_set_range(&mask, firstAxis, axesCount, v);
-    GetEventList(&events);
-    nevents = GetPointerEvents(events, pDevice, MotionNotify, 0,
-                               POINTER_ABSOLUTE, &mask);
-    for (i = 0; i < nevents; i++)
-        mieqEnqueue(pDevice, (InternalEvent*)(events + i)->event);
+    QueuePointerEvents(pDevice, MotionNotify, 0,
+                       POINTER_ABSOLUTE, &mask);
 
     if (block)
         dmxSigioUnblock();
@@ -394,8 +385,6 @@ static int dmxTranslateAndEnqueueExtEvent(DMXLocalInputInfoPtr dmxLocal,
     XDeviceMotionEvent     *me     = (XDeviceMotionEvent *)e;
     DeviceIntPtr           pDevice = dmxLocal->pDevice;
     int                    valuators[MAX_VALUATORS];
-    EventListPtr           events;
-    int                    nevents, i;
     ValuatorMask           mask;
 
     if (!e)
@@ -452,12 +441,7 @@ static int dmxTranslateAndEnqueueExtEvent(DMXLocalInputInfoPtr dmxLocal,
         valuator_mask_set_range(&mask, ke->first_axis, ke->axes_count, valuators);
         if (block)
             dmxSigioBlock();
-        GetEventList(&events);
-        nevents = GetKeyboardEvents(events, pDevice, event,
-                                    ke->keycode, &mask);
-        for (i = 0; i < nevents; i++)
-            mieqEnqueue(pDevice, (InternalEvent*)(events + i)->event);
-
+        QueueKeyboardEvents(pDevice, event, ke->keycode, &mask);
         if (block)
             dmxSigioUnblock();
         break;
@@ -467,12 +451,8 @@ static int dmxTranslateAndEnqueueExtEvent(DMXLocalInputInfoPtr dmxLocal,
         valuator_mask_set_range(&mask, ke->first_axis, ke->axes_count, valuators);
         if (block)
             dmxSigioBlock();
-        GetEventList(&events);
-        nevents = GetPointerEvents(events, pDevice, event, ke->keycode,
-                                   POINTER_ABSOLUTE, &mask);
-        for (i = 0; i < nevents; i++)
-            mieqEnqueue(pDevice, (InternalEvent*)(events + i)->event);
-
+        QueuePointerEvents(pDevice, event, ke->keycode,
+                           POINTER_ABSOLUTE, &mask);
         if (block)
             dmxSigioUnblock();
         break;
@@ -482,11 +462,7 @@ static int dmxTranslateAndEnqueueExtEvent(DMXLocalInputInfoPtr dmxLocal,
         valuator_mask_set_range(&mask, ke->first_axis, ke->axes_count, valuators);
         if (block)
             dmxSigioBlock();
-        GetEventList(&events);
-        nevents = GetProximityEvents(events, pDevice, event, &mask);
-        for (i = 0; i < nevents; i++)
-            mieqEnqueue(pDevice, (InternalEvent*)(events + i)->event);
-
+        QueueProximityEvents(pDevice, event, &mask);
         if (block)
             dmxSigioUnblock();
         break;
@@ -667,8 +643,7 @@ void dmxEnqueue(DevicePtr pDev, int type, int detail, KeySym keySym,
     GETDMXINPUTFROMPDEV;
     xEvent xE;
     DeviceIntPtr p = dmxLocal->pDevice;
-    int i, nevents, valuators[3];
-    EventListPtr events;
+    int valuators[3];
     ValuatorMask mask;
 
     DMXDBG2("dmxEnqueue: Enqueuing type=%d detail=0x%0x\n", type, detail);
@@ -683,34 +658,25 @@ void dmxEnqueue(DevicePtr pDev, int type, int detail, KeySym keySym,
         if (dmxLocal->sendsCore && dmxLocal != dmxLocalCoreKeyboard)
             xE.u.u.detail = dmxFixup(pDev, detail, keySym);
 
-        GetEventList(&events);
         /*ErrorF("KEY %d  sym %d\n", detail, (int) keySym);*/
-        nevents = GetKeyboardEvents(events, p, type, detail, NULL);
-        for (i = 0; i < nevents; i++)
-            mieqEnqueue(p, (InternalEvent*)(events + i)->event);
+        QueueKeyboardEvents(p, type, detail, NULL);
         return;
 
     case ButtonPress:
     case ButtonRelease:
         detail = dmxGetButtonMapping(dmxLocal, detail);
         valuator_mask_zero(&mask);
-        GetEventList(&events);
-        nevents = GetPointerEvents(events, p, type, detail,
-                                   POINTER_ABSOLUTE | POINTER_SCREEN, &mask);
-        for (i = 0; i < nevents; i++)
-            mieqEnqueue(p, (InternalEvent*)(events + i)->event);
+        QueuePointerEvents(p, type, detail,
+                           POINTER_ABSOLUTE | POINTER_SCREEN, &mask);
         return;
 
     case MotionNotify:
-        GetEventList(&events);
         valuators[0] = e->xmotion.x;
         valuators[1] = e->xmotion.y;
         valuators[2] = e->xmotion.state; /* FIXME: WTF?? */
         valuator_mask_set_range(&mask, 0, 3, valuators);
-        nevents = GetPointerEvents(events, p, type, detail, 
-                                   POINTER_ABSOLUTE | POINTER_SCREEN, &mask);
-        for (i = 0; i < nevents; i++)
-            mieqEnqueue(p, (InternalEvent*)(events + i)->event);
+        QueuePointerEvents(p, type, detail,
+                           POINTER_ABSOLUTE | POINTER_SCREEN, &mask);
         return;
 
     case EnterNotify:
diff --git a/xorg-server/hw/kdrive/src/kinput.c b/xorg-server/hw/kdrive/src/kinput.c
index f21475fb6..cdf55d7f9 100644
--- a/xorg-server/hw/kdrive/src/kinput.c
+++ b/xorg-server/hw/kdrive/src/kinput.c
@@ -66,8 +66,6 @@ static struct KdConfigDevice *kdConfigPointers    = NULL;
 static KdKeyboardDriver *kdKeyboardDrivers = NULL;
 static KdPointerDriver  *kdPointerDrivers  = NULL;
 
-static EventListPtr     kdEvents = NULL;
-
 static Bool		kdInputEnabled;
 static Bool		kdOffScreen;
 static unsigned long	kdOffScreenTime;
@@ -1793,7 +1791,7 @@ void
 KdReleaseAllKeys (void)
 {
 #if 0
-    int	key, nEvents, i;
+    int	key;
     KdKeyboardInfo *ki;
 
     KdBlockSigio ();
@@ -1803,10 +1801,7 @@ KdReleaseAllKeys (void)
              key++) {
             if (key_is_down(ki->dixdev, key, KEY_POSTED | KEY_PROCESSED)) {
                 KdHandleKeyboardEvent(ki, KeyRelease, key);
-                GetEventList(&kdEvents);
-                nEvents = GetKeyboardEvents(kdEvents, ki->dixdev, KeyRelease, key, NULL);
-                for (i = 0; i < nEvents; i++)
-                    KdQueueEvent (ki->dixdev, (kdEvents + i)->event);
+                QueueGetKeyboardEvents(ki->dixdev, KeyRelease, key, NULL);
             }
         }
     }
@@ -1842,7 +1837,7 @@ KdEnqueueKeyboardEvent(KdKeyboardInfo   *ki,
     unsigned char key_code;
     KeyClassPtr	keyc = NULL;
     KeybdCtrl *ctrl = NULL;
-    int type, nEvents, i;
+    int type;
 
     if (!ki || !ki->dixdev || !ki->dixdev->kbdfeed || !ki->dixdev->key)
 	return;
@@ -1862,11 +1857,7 @@ KdEnqueueKeyboardEvent(KdKeyboardInfo   *ki,
 	else
 	    type = KeyPress;
 
-        GetEventList(&kdEvents);
-
-        nEvents = GetKeyboardEvents(kdEvents, ki->dixdev, type, key_code, NULL);
-        for (i = 0; i < nEvents; i++)
-            KdQueueEvent(ki->dixdev, (InternalEvent *)((kdEvents + i)->event));
+        QueueKeyboardEvents(ki->dixdev, type, key_code, NULL);
     }
     else {
         ErrorF("driver %s wanted to post scancode %d outside of [%d, %d]!\n",
@@ -1965,7 +1956,6 @@ void
 _KdEnqueuePointerEvent (KdPointerInfo *pi, int type, int x, int y, int z,
                         int b, int absrel, Bool force)
 {
-    int nEvents = 0, i = 0;
     int valuators[3] = { x, y, z };
     ValuatorMask mask;
 
@@ -1975,10 +1965,7 @@ _KdEnqueuePointerEvent (KdPointerInfo *pi, int type, int x, int y, int z,
 
     valuator_mask_set_range(&mask, 0, 3, valuators);
 
-    GetEventList(&kdEvents);
-    nEvents = GetPointerEvents(kdEvents, pi->dixdev, type, b, absrel, &mask);
-    for (i = 0; i < nEvents; i++)
-        KdQueueEvent(pi->dixdev, (InternalEvent *)((kdEvents + i)->event));
+    QueuePointerEvents(pi->dixdev, type, b, absrel, &mask);
 }
 
 void
diff --git a/xorg-server/hw/xfree86/Makefile.am b/xorg-server/hw/xfree86/Makefile.am
index 94ef966e2..f1a759a27 100644
--- a/xorg-server/hw/xfree86/Makefile.am
+++ b/xorg-server/hw/xfree86/Makefile.am
@@ -1,118 +1,118 @@
-

-if DRI

-DRI_SUBDIR = dri

-endif

-

-if DRI2

-DRI2_SUBDIR = dri2

-endif

-

-if XF86UTILS

-XF86UTILS_SUBDIR = utils

-endif

-

-if XAA

-XAA_SUBDIR = xaa

-endif

-

-if VGAHW

-VGAHW_SUBDIR = vgahw

-endif

-

-if VBE

-VBE_SUBDIR = vbe

-endif

-

-if INT10MODULE

-INT10_SUBDIR = int10

-endif

-

-SUBDIRS = common ddc i2c x86emu $(INT10_SUBDIR) fbdevhw os-support parser \

-	  ramdac shadowfb $(VBE_SUBDIR) $(VGAHW_SUBDIR) $(XAA_SUBDIR) \

-	  loader dixmods exa modes \

-	  $(DRI_SUBDIR) $(DRI2_SUBDIR) $(XF86UTILS_SUBDIR) doc man

-

-DIST_SUBDIRS = common ddc i2c x86emu int10 fbdevhw os-support \

-               parser ramdac shadowfb vbe vgahw xaa \

-               loader dixmods dri dri2 exa modes \

-	       utils doc man

-

-bin_PROGRAMS = Xorg

-Xorg_SOURCES = xorg.c

-

-AM_CFLAGS = $(DIX_CFLAGS) @XORG_CFLAGS@

-INCLUDES = @XORG_INCS@ 

-

-noinst_LTLIBRARIES = libxorg.la

-libxorg_la_SOURCES = libxorg.c

-libxorg_la_LIBADD = \

-            $(XSERVER_LIBS) \

-            loader/libloader.la \

-            os-support/libxorgos.la \

-            common/libcommon.la \

-            parser/libxf86config_internal.la \

-            dixmods/libdixmods.la \

-            modes/libxf86modes.la \

-            ramdac/libramdac.la \

-            ddc/libddc.la \

-            i2c/libi2c.la \

-            dixmods/libxorgxkb.la \

-            $(top_builddir)/mi/libmi.la \

-            $(top_builddir)/os/libos.la \

-            @XORG_LIBS@

-

-libxorg_la_DEPENDENCIES = $(libxorg_la_LIBADD)

-

-libxorg.c xorg.c:

-	touch $@

-

-DISTCLEANFILES = libxorg.c xorg.c

-

-Xorg_DEPENDENCIES = libxorg.la

-Xorg_LDADD = $(MAIN_LIB) libxorg.la $(XORG_SYS_LIBS) $(XSERVER_SYS_LIBS)

-

-Xorg_LDFLAGS = $(LD_EXPORT_SYMBOLS_FLAG)

-

-BUILT_SOURCES = xorg.conf.example

-DISTCLEANFILES += xorg.conf.example

-EXTRA_DIST = xorgconf.cpp

-

-if SPECIAL_DTRACE_OBJECTS

-# Re-add dtrace object code that gets lost when building static libraries

-Xorg_LDADD += $(XSERVER_LIBS)

-endif

-

-if SOLARIS_ASM_INLINE

-# Needs to be built before any files are compiled when using Sun compilers

-# so in*/out* inline definitions are properly processed.

-

-BUILT_SOURCES += os-support/solaris/solaris-@SOLARIS_INOUT_ARCH@.il

-

-os-support/solaris/solaris-@SOLARIS_INOUT_ARCH@.il:

-	cd os-support/solaris ; \

-	 $(MAKE) $(AM_MAKEFLAGS) solaris-@SOLARIS_INOUT_ARCH@.il

-endif

-

-# do not use $(mkdir_p) if you want automake 1.7 to work

-install-data-local:

-	mkdir -p $(DESTDIR)$(logdir)

-

-

-install-exec-local: install-binPROGRAMS

-	(cd $(DESTDIR)$(bindir) && rm -f X && ln -s Xorg X)

-if INSTALL_SETUID

-	chown root $(DESTDIR)$(bindir)/Xorg

-	chmod u+s $(DESTDIR)$(bindir)/Xorg

-endif

-

-# Use variables from XORG_MANPAGE_SECTIONS and X Server configuration

-# Do not include manpages.am as values are not appropriate for rc files

-CONF_SUBSTS =	-e 's|__filemansuffix__|$(FILE_MAN_SUFFIX)|g' \

-		-e 's|MODULEPATH|$(DEFAULT_MODULE_PATH)|g' \

-		-e 's|DEFAULTFONTPATH|$(COMPILEDDEFAULTFONTPATH)|g'

-

-xorg.conf.example: xorgconf.cpp

-	$(AM_V_GEN)$(SED) $(CONF_SUBSTS) < $< > $@

-

-relink:

-	$(AM_V_at)rm -f Xorg && $(MAKE) Xorg

+
+if DRI
+DRI_SUBDIR = dri
+endif
+
+if DRI2
+DRI2_SUBDIR = dri2
+endif
+
+if XF86UTILS
+XF86UTILS_SUBDIR = utils
+endif
+
+if XAA
+XAA_SUBDIR = xaa
+endif
+
+if VGAHW
+VGAHW_SUBDIR = vgahw
+endif
+
+if VBE
+VBE_SUBDIR = vbe
+endif
+
+if INT10MODULE
+INT10_SUBDIR = int10
+endif
+
+SUBDIRS = common ddc i2c x86emu $(INT10_SUBDIR) fbdevhw os-support parser \
+	  ramdac shadowfb $(VBE_SUBDIR) $(VGAHW_SUBDIR) $(XAA_SUBDIR) \
+	  loader dixmods exa modes \
+	  $(DRI_SUBDIR) $(DRI2_SUBDIR) $(XF86UTILS_SUBDIR) doc man
+
+DIST_SUBDIRS = common ddc i2c x86emu int10 fbdevhw os-support \
+               parser ramdac shadowfb vbe vgahw xaa \
+               loader dixmods dri dri2 exa modes \
+	       utils doc man
+
+bin_PROGRAMS = Xorg
+Xorg_SOURCES = xorg.c
+
+AM_CFLAGS = $(DIX_CFLAGS) @XORG_CFLAGS@
+INCLUDES = @XORG_INCS@ 
+
+noinst_LTLIBRARIES = libxorg.la
+libxorg_la_SOURCES = libxorg.c
+libxorg_la_LIBADD = \
+            $(XSERVER_LIBS) \
+            loader/libloader.la \
+            os-support/libxorgos.la \
+            common/libcommon.la \
+            parser/libxf86config_internal.la \
+            dixmods/libdixmods.la \
+            modes/libxf86modes.la \
+            ramdac/libramdac.la \
+            ddc/libddc.la \
+            i2c/libi2c.la \
+            dixmods/libxorgxkb.la \
+            $(top_builddir)/mi/libmi.la \
+            $(top_builddir)/os/libos.la \
+            @XORG_LIBS@
+
+libxorg_la_DEPENDENCIES = $(libxorg_la_LIBADD)
+
+libxorg.c xorg.c:
+	touch $@
+
+DISTCLEANFILES = libxorg.c xorg.c
+
+Xorg_DEPENDENCIES = libxorg.la
+Xorg_LDADD = $(MAIN_LIB) libxorg.la $(XORG_SYS_LIBS) $(XSERVER_SYS_LIBS)
+
+Xorg_LDFLAGS = $(LD_EXPORT_SYMBOLS_FLAG)
+
+BUILT_SOURCES = xorg.conf.example
+DISTCLEANFILES += xorg.conf.example
+EXTRA_DIST = xorgconf.cpp
+
+if SPECIAL_DTRACE_OBJECTS
+# Re-add dtrace object code that gets lost when building static libraries
+Xorg_LDADD += $(XSERVER_LIBS)
+endif
+
+if SOLARIS_ASM_INLINE
+# Needs to be built before any files are compiled when using Sun compilers
+# so in*/out* inline definitions are properly processed.
+
+BUILT_SOURCES += os-support/solaris/solaris-@SOLARIS_INOUT_ARCH@.il
+
+os-support/solaris/solaris-@SOLARIS_INOUT_ARCH@.il:
+	cd os-support/solaris ; \
+	 $(MAKE) $(AM_MAKEFLAGS) solaris-@SOLARIS_INOUT_ARCH@.il
+endif
+
+# do not use $(mkdir_p) if you want automake 1.7 to work
+install-data-local:
+	mkdir -p $(DESTDIR)$(logdir)
+
+
+install-exec-local: install-binPROGRAMS
+	(cd $(DESTDIR)$(bindir) && rm -f X && ln -s Xorg X)
+if INSTALL_SETUID
+	chown root $(DESTDIR)$(bindir)/Xorg
+	chmod u+s $(DESTDIR)$(bindir)/Xorg
+endif
+
+# Use variables from XORG_MANPAGE_SECTIONS and X Server configuration
+# Do not include manpages.am as values are not appropriate for rc files
+CONF_SUBSTS =	-e 's|__filemansuffix__|$(FILE_MAN_SUFFIX)|g' \
+		-e 's|MODULEPATH|$(DEFAULT_MODULE_PATH)|g' \
+		-e 's|DEFAULTFONTPATH|$(COMPILEDDEFAULTFONTPATH)|g'
+
+xorg.conf.example: xorgconf.cpp
+	$(AM_V_GEN)$(SED) $(CONF_SUBSTS) < $(srcdir)/xorgconf.cpp > $@
+
+relink:
+	$(AM_V_at)rm -f Xorg && $(MAKE) Xorg
diff --git a/xorg-server/hw/xfree86/common/xf86Events.c b/xorg-server/hw/xfree86/common/xf86Events.c
index 3006ad183..c4a4db9be 100644
--- a/xorg-server/hw/xfree86/common/xf86Events.c
+++ b/xorg-server/hw/xfree86/common/xf86Events.c
@@ -376,7 +376,7 @@ static void
 xf86ReleaseKeys(DeviceIntPtr pDev)
 {
     KeyClassPtr keyc;
-    int i, j, nevents, sigstate;
+    int i, sigstate;
 
     if (!pDev || !pDev->key)
         return;
@@ -399,9 +399,7 @@ xf86ReleaseKeys(DeviceIntPtr pDev)
          i++) {
         if (key_is_down(pDev, i, KEY_POSTED)) {
             sigstate = xf86BlockSIGIO ();
-            nevents = GetKeyboardEvents(xf86Events, pDev, KeyRelease, i, NULL);
-            for (j = 0; j < nevents; j++)
-                mieqEnqueue(pDev, (InternalEvent*)(xf86Events + j)->event);
+            QueueKeyboardEvents(pDev, KeyRelease, i, NULL);
             xf86UnblockSIGIO(sigstate);
         }
     }
diff --git a/xorg-server/hw/xfree86/common/xf86Init.c b/xorg-server/hw/xfree86/common/xf86Init.c
index 0b36163c0..53f763aaf 100644
--- a/xorg-server/hw/xfree86/common/xf86Init.c
+++ b/xorg-server/hw/xfree86/common/xf86Init.c
@@ -806,8 +806,6 @@ InitInput(int argc, char **argv)
 
     mieqInit();
 
-    GetEventList(&xf86Events);
-
     /* Initialize all configured input devices */
     for (pDev = xf86ConfigLayout.inputs; pDev && *pDev; pDev++) {
         /* Replace obsolete keyboard driver with kbd */
diff --git a/xorg-server/hw/xfree86/common/xf86Priv.h b/xorg-server/hw/xfree86/common/xf86Priv.h
index 7137a5363..5d91ab367 100644
--- a/xorg-server/hw/xfree86/common/xf86Priv.h
+++ b/xorg-server/hw/xfree86/common/xf86Priv.h
@@ -148,9 +148,6 @@ extern _X_EXPORT int xf86SetVerbosity(int verb);
 extern _X_EXPORT int xf86SetLogVerbosity(int verb);
 extern _X_EXPORT Bool xf86CallDriverProbe( struct _DriverRec * drv, Bool detect_only );
 
-/* xf86Xinput.c */
-extern _X_EXPORT EventList *xf86Events;
-
 #endif /* _NO_XF86_PROTOTYPES */
 
 
diff --git a/xorg-server/hw/xfree86/common/xf86Xinput.c b/xorg-server/hw/xfree86/common/xf86Xinput.c
index ef4542c5f..e7e1ce1f0 100644
--- a/xorg-server/hw/xfree86/common/xf86Xinput.c
+++ b/xorg-server/hw/xfree86/common/xf86Xinput.c
@@ -99,8 +99,6 @@
 		return;								\
 	}
 
-EventListPtr xf86Events = NULL;
-
 static int
 xf86InputDevicePostInit(DeviceIntPtr dev);
 
@@ -329,8 +327,8 @@ xf86ActivateDevice(InputInfoPtr pInfo)
     dev->config_info = xf86SetStrOption(pInfo->options, "config_info", NULL);
 
     if (serverGeneration == 1)
-        xf86Msg(X_INFO, "XINPUT: Adding extended input device \"%s\" (type: %s)\n",
-                pInfo->name, pInfo->type_name);
+        xf86Msg(X_INFO, "XINPUT: Adding extended input device \"%s\" (type: %s, id %d)\n",
+                pInfo->name, pInfo->type_name, dev->id);
 
     return dev;
 }
@@ -1012,7 +1010,6 @@ xf86PostMotionEventM(DeviceIntPtr	device,
                      int		is_absolute,
                      const ValuatorMask	*mask)
 {
-    int i = 0, nevents = 0;
     int flags = 0;
 
     if (valuator_mask_num_valuators(mask) > 0)
@@ -1050,11 +1047,7 @@ xf86PostMotionEventM(DeviceIntPtr	device,
         }
 #endif
 
-    nevents = GetPointerEvents(xf86Events, device, MotionNotify, 0, flags, mask);
-
-    for (i = 0; i < nevents; i++) {
-        mieqEnqueue(device, (InternalEvent*)((xf86Events + i)->event));
-    }
+    QueuePointerEvents(device, MotionNotify, 0, flags, mask);
 }
 
 void
@@ -1099,13 +1092,7 @@ xf86PostProximityEventM(DeviceIntPtr	device,
                         int		is_in,
                         const ValuatorMask *mask)
 {
-    int i, nevents;
-
-    nevents = GetProximityEvents(xf86Events, device,
-                                 is_in ? ProximityIn : ProximityOut, mask);
-    for (i = 0; i < nevents; i++)
-        mieqEnqueue(device, (InternalEvent*)((xf86Events + i)->event));
-
+    QueueProximityEvents(device, is_in ? ProximityIn : ProximityOut, mask);
 }
 
 void
@@ -1157,7 +1144,6 @@ xf86PostButtonEventM(DeviceIntPtr	device,
                      int		is_down,
                      const ValuatorMask	*mask)
 {
-    int i = 0, nevents = 0;
     int flags = 0;
 
     if (valuator_mask_num_valuators(mask) > 0)
@@ -1177,13 +1163,9 @@ xf86PostButtonEventM(DeviceIntPtr	device,
     }
 #endif
 
-    nevents = GetPointerEvents(xf86Events, device,
-                               is_down ? ButtonPress : ButtonRelease, button,
-                               flags, mask);
-
-    for (i = 0; i < nevents; i++)
-        mieqEnqueue(device, (InternalEvent*)((xf86Events + i)->event));
-
+    QueuePointerEvents(device,
+                       is_down ? ButtonPress : ButtonRelease, button,
+                       flags, mask);
 }
 
 void
@@ -1235,8 +1217,6 @@ xf86PostKeyEventM(DeviceIntPtr	device,
                   int		is_absolute,
                   const ValuatorMask *mask)
 {
-    int i = 0, nevents = 0;
-
 #if XFreeXDGA
     DeviceIntPtr pointer;
 
@@ -1250,12 +1230,9 @@ xf86PostKeyEventM(DeviceIntPtr	device,
     }
 #endif
 
-    nevents = GetKeyboardEvents(xf86Events, device,
-                                is_down ? KeyPress : KeyRelease,
-                                key_code, mask);
-
-    for (i = 0; i < nevents; i++)
-        mieqEnqueue(device, (InternalEvent*)((xf86Events + i)->event));
+    QueueKeyboardEvents(device,
+                        is_down ? KeyPress : KeyRelease,
+                        key_code, mask);
 }
 
 void
diff --git a/xorg-server/hw/xfree86/doc/Makefile.am b/xorg-server/hw/xfree86/doc/Makefile.am
index acb8937f0..1c3620abb 100644
--- a/xorg-server/hw/xfree86/doc/Makefile.am
+++ b/xorg-server/hw/xfree86/doc/Makefile.am
@@ -1,4 +1,18 @@
-SUBDIRS = devel sgml

-

-EXTRA_DIST = \

-	README.modes

+
+if ENABLE_DEVEL_DOCS
+if HAVE_XMLTO
+
+# Main DocBook/XML files (DOCTYPE book)
+docbook = ddxDesign.xml
+
+# Generate DocBook/XML output formats with or without stylesheets
+include $(top_srcdir)/devbook.am
+
+endif HAVE_XMLTO
+endif ENABLE_DEVEL_DOCS
+
+EXTRA_DIST =		\
+	Registry	\
+	exa-driver.txt	\
+	README.DRIcomp	\
+	README.modes
diff --git a/xorg-server/hw/xfree86/doc/devel/README.DRIcomp b/xorg-server/hw/xfree86/doc/README.DRIcomp
index 89f40a759..89f40a759 100644
--- a/xorg-server/hw/xfree86/doc/devel/README.DRIcomp
+++ b/xorg-server/hw/xfree86/doc/README.DRIcomp
diff --git a/xorg-server/hw/xfree86/doc/devel/Registry b/xorg-server/hw/xfree86/doc/Registry
index 89a5f10fa..89a5f10fa 100644
--- a/xorg-server/hw/xfree86/doc/devel/Registry
+++ b/xorg-server/hw/xfree86/doc/Registry
diff --git a/xorg-server/hw/xfree86/doc/sgml/DESIGN.xml b/xorg-server/hw/xfree86/doc/ddxDesign.xml
index 13e582877..02909602c 100644
--- a/xorg-server/hw/xfree86/doc/sgml/DESIGN.xml
+++ b/xorg-server/hw/xfree86/doc/ddxDesign.xml
@@ -1,9394 +1,9394 @@
-<?xml version="1.0" encoding="ISO-8859-1"?>

-<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"

- "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [

- <!ENTITY % defs SYSTEM "/xserver/doc/xml/xserver.ent"> %defs;

- <!-- config file keyword markup -->

- <!-- specific config file keywords -->

- <!ENTITY k.device "<emphasis>Device</emphasis>">

- <!ENTITY k.monitor "<emphasis>Monitor</emphasis>">

- <!ENTITY k.display "<emphasis>Display</emphasis>">

- <!ENTITY k.inputdevice "<emphasis>InputDevice</emphasis>">

- <!ENTITY k.screen "<emphasis>Screen</emphasis>">

- <!ENTITY k.serverlayout "<emphasis>ServerLayout</emphasis>">

- <!ENTITY k.driver "<emphasis>Driver</emphasis>">

- <!ENTITY k.module "<emphasis>Module</emphasis>">

- <!ENTITY k.identifier "<emphasis>Identifier</emphasis>">

- <!ENTITY k.serverflags "<emphasis>ServerFlags</emphasis>">

-] >

-

-<article>

-  <articleinfo>

-

-    <title>XFree86 DDX Design (Xorg server version &xserver.version;)</title>

-

-    <authorgroup>

-      <corpauthor><ulink url="http://www.xfree86.org/">

-	The XFree86 Project, Inc.</ulink></corpauthor>

-      <corpauthor><ulink url="http://www.x.org/">

-	The X.Org Foundation, Inc.</ulink></corpauthor>

-

-      <othercredit>

-	<firstname>Jim</firstname><surname>Gettys</surname>

-	<contrib>Updates for X11R6.7</contrib>

-      </othercredit>

-    </authorgroup>

-

-    <pubdate>&xserver.reldate;</pubdate>

-    <releaseinfo>Xorg server version &xserver.version;</releaseinfo>

-

-  </articleinfo>

-

-  <note><para>

-This document describes software undergoing continual evolution, and

-the interfaces described here are subject to change without notice.

-This document is intended to cover the interfaces as found in the

-xorg-server-&xserver.version; release, but is probably not completely

-in sync with the code base.

-    </para></note>

-

-

-  <sect1>

-    <title>Preface</title>

-

-    <para>

-This document was originally the design spec for the DDX layer of the

-XFree86 4.0 X server.  The X.Org Foundation adopted the XFree86 4.4rc2

-version of that server as the basis of the Xorg server project, and has

-evolved the XFree86 DDX layer greatly since forking.   This document thus

-covers only the current implementation of the XFree86 DDX as found in the

-Xorg server &xserver.version; release, and no longer matches the XFree86

-server itself.

-      </para>

-

-    <para>

-The XFree86 Project's broad design principles for XFree86 4.0 were:

-      <itemizedlist>

-	<listitem><para>keep it reasonable

-	    <itemizedlist>

-	      <listitem><para>We cannot rewrite the complete server

-		</para></listitem>

-	      <listitem><para>We don't want to re-invent the wheel

-		</para></listitem>

-	    </itemizedlist></para></listitem>

-	<listitem><para>keep it modular

-	    <itemizedlist>

-	      <listitem><para>As many things as possible should go into modules

-		</para></listitem>

-	      <listitem><para>The basic loader binary should be minimal

-		</para></listitem>

-	      <listitem><para>A clean design with well defined layering is

-		  important</para></listitem>

-	      <listitem><para>DDX specific global variables are a nono

-		</para></listitem>

-	      <listitem><para>The structure should be flexible enough to allow

-		  future extensions</para></listitem>

-	      <listitem><para>The structure should minimize duplication of

-		  common code</para></listitem>

-	    </itemizedlist></para></listitem>

-	<listitem><para>keep important features in mind

-	    <itemizedlist>

-	      <listitem><para>multiple screens, including multiple instances

-		  of drivers</para></listitem>

-	      <listitem><para>mixing different color depths and visuals on

-		  different and ideally even on the same screen

-		</para></listitem>

-	      <listitem><para>better control of the PCI device used

-		</para></listitem>

-	      <listitem><para>better config file parser</para></listitem>

-	      <listitem><para>get rid of all VGA compatibility assumptions

-		</para></listitem>

-	    </itemizedlist></para></listitem>

-      </itemizedlist>

-    </para>

-

-    <para>

-While the XFree86 project had a goal of avoiding changes to the DIX

-layer unless they found major deficiencies there, to avoid divergence from

-the X.Org sample implementation they were integrating changes from, the

-X.Org developers now maintain both sides, and make changes where they are

-most appropriate.   This document concentrates on the XFree86 DDX layer used

-in the Xorg server itself (the code found in <filename>hw/xfree86</filename>

-in the source tree), and developers will also want to refer to the

-<filename>Xserver-spec</filename> documentation that covers the DIX layer

-routines common to all the X servers in the sample implementation.

-    </para>

-  </sect1>

-

-  <sect1>

-    <title>The xorg.conf File</title>

-

-    <para>

-The xorg.conf file format is based on the XF86Config format from XFree86 4.4,

-which is in turn similar to the old XFree86 3.x XF86Config format, with the

-following changes:

-    </para>

-

-    <sect2>

-      <title>&k.device; section</title>

-

-      <para>

-    The &k.device; sections are similar to what they used to be, and

-    describe hardware-specific information for a single video card.

-    &k.device;

-    Some new keywords are added:

-

-

-	<variablelist>

-	  <varlistentry><term>Driver "drivername"</term>

-	    <listitem><para>

-        Specifies the name of the driver to be used for the card.  This

-        is mandatory.

-	      </para></listitem></varlistentry>

-	  <varlistentry><term>BusID "busslot"</term>

-	    <listitem><para>

-        Specifies uniquely the location of the card on the bus.  The

-        purpose is to identify particular cards in a multi-headed

-        configuration.  The format of the argument is intentionally

-        vague, and may be architecture dependent.  For a PCI bus, it

-        is something like "bus:slot:func".

-	      </para></listitem></varlistentry>

-	</variablelist>

-      </para>

-

-      <para>

-    A &k.device; section is considered <quote>active</quote> if there is a reference

-    to it in an active &k.screen; section.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>&k.screen; section</title>

-

-      <para>

-    The &k.screen; sections are similar to what they used to be.  They

-    no longer have a &k.driver; keyword, but an &k.identifier; keyword

-    is added.  (The &k.driver; keyword may be accepted in place of the

-    &k.identifier; keyword for compatibility purposes.)  The identifier

-    can be used to identify which screen is to be active when multiple

-    &k.screen; sections are present.  It is possible to specify the active

-    screen from the command line.  A default is chosen in the absence

-    of one being specified.  A &k.screen; section is considered <quote>active</quote>

-    if there is a reference to it either from the command line, or from

-    an active &k.serverlayout; section.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>&k.inputdevice; section</title>

-

-      <para>

-    The &k.inputdevice; section is a new section that describes

-    configuration information for input devices.  It replaces the old

-    <emphasis>Keyboard</emphasis>, <emphasis>Pointer</emphasis> and <emphasis>XInput</emphasis>

-    sections.  Like the &k.device; section, it has two mandatory keywords:

-    &k.identifier; and &k.driver;.  For compatibility purposes the old

-    <emphasis>Keyboard</emphasis> and <emphasis>Pointer</emphasis> sections are

-    converted by the parser into &k.inputdevice; sections as follows:

-

-	<variablelist>

-	  <varlistentry><term><emphasis>Keyboard</emphasis></term>

-	    <listitem><literallayout>

-             &k.identifier; "Implicit Core Keyboard"

-             &k.driver; "keyboard"

-	      </literallayout></listitem></varlistentry>

-	  <varlistentry><term><emphasis>Pointer</emphasis></term>

-	    <listitem><literallayout>

-             &k.identifier; "Implicit Core Pointer"

-             &k.driver; "mouse"

-	      </literallayout></listitem></varlistentry>

-	</variablelist>

-      </para>

-

-      <para>

-    An &k.inputdevice; section is considered active if there is a

-    reference to it in an active &k.serverlayout; section.  An

-    &k.inputdevice; section may also be referenced implicitly if there

-    is no &k.serverlayout; section, if the <option>-screen</option> command

-    line options is used, or if the &k.serverlayout; section doesn't

-    reference any &k.inputdevice; sections.  In this case, the first

-    sections with drivers "keyboard" and "mouse" are used as the core

-    keyboard and pointer respectively.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>&k.serverlayout; section</title>

-

-      <para>

-    The &k.serverlayout; section is a new section that is used to identify

-    which &k.screen; sections are to be used in a multi-headed configuration,

-    and the relative layout of those screens.  It also identifies which

-    &k.inputdevice; sections are to be used.  Each &k.serverlayout; section

-    has an identifier, a list of &k.screen; section identifiers, and a list of

-    &k.inputdevice; section identifiers.  &k.serverflags; options may also be

-    included in a &k.serverlayout; section, making it possible to override

-    the global values in the &k.serverflags; section.

-      </para>

-

-      <para>

-    A &k.serverlayout; section can be made active by being referenced on

-    the command line.  In the absence of this, a default will be chosen

-    (the first one found).  The screen names may optionally be followed

-    by a number specifying the preferred screen number, and optionally

-    by information specifying the physical positioning of the screen,

-    either in absolute terms or relative to another screen (or screens).

-    When no screen number is specified, they are numbered according to

-    the order in which they are listed.  The old (now obsolete) method

-    of providing the positioning information is to give the names of

-    the four adjacent screens.  The order of these is top, bottom, left,

-    right.  Here is an example of a &k.serverlayout; section for two

-    screens using the old method, with the second located to the right

-    of the first:

-

-	<programlisting>

-      Section "ServerLayout"

-        Identifier "Main Layout"

-        Screen     0 "Screen 1" ""  ""  ""  "Screen 2"

-        Screen     1 "Screen 2"

-        Screen     "Screen 3"

-      EndSection

-	</programlisting>

-      </para>

-

-      <para>

-    The preferred way of specifying the layout is to explicitly specify

-    the screen's location in absolute terms or relative to another

-    screen.

-      </para>

-

-      <para>

-    In the absolute case, the upper left corner's coordinates are given

-    after the <emphasis>Absolute</emphasis> keyword.  If the coordinates are

-    omitted, a value of <code>(0,0)</code> is assumed.  An example

-    of absolute positioning follows:

-

-	<programlisting>

-      Section "ServerLayout"

-        Identifier "Main Layout"

-        Screen     0 "Screen 1" Absolute 0 0

-        Screen     1 "Screen 2" Absolute 1024 0

-        Screen     "Screen 3" Absolute 2048 0

-      EndSection

-	</programlisting>

-      </para>

-

-      <para>

-    In the relative case, the position is specified by either using one of

-    the following keywords followed by the name of the reference screen:

-

-	<simplelist type='vert' columns='1'>

-	  <member><emphasis>RightOf</emphasis></member>

-	  <member><emphasis>LeftOf</emphasis></member>

-	  <member><emphasis>Above</emphasis></member>

-	  <member><emphasis>Below</emphasis></member>

-	  <member><emphasis>Relative</emphasis></member>

-	</simplelist>

-      </para>

-

-      <para>

-    When the <emphasis>Relative</emphasis> keyword is used, the reference screen

-    name is followed by the coordinates of the new screen's origin

-    relative to reference screen.  The following example shows how to use

-    some of the relative positioning options.

-

-	<programlisting>

-      Section "ServerLayout"

-        Identifier "Main Layout"

-        Screen     0 "Screen 1"

-        Screen     1 "Screen 2" RightOf "Screen 1"

-        Screen     "Screen 3" Relative "Screen 1" 2048 0

-      EndSection

-	</programlisting>

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>Options</title>

-

-      <para>

-    Options are used more extensively.  They may appear in most sections

-    now.  Options related to drivers can be present in the &k.screen;,

-    &k.device; and &k.monitor; sections and the &k.display; subsections.

-    The order of precedence is &k.display;, &k.screen;, &k.monitor;,

-    &k.device;.  Options have been extended to allow an optional value

-    to be specified in addition to the option name.  For more details

-    about options, see the <link linkend="options">Options</link> section

-    for details.

-      </para>

-    </sect2>

-  </sect1>

-

-  <sect1>

-    <title>Driver Interface</title>

-

-    <para>

-The driver interface consists of a minimal set of entry points that are

-required based on the external events that the driver must react to.

-No non-essential structure is imposed on the way they are used beyond

-that.  This is a significant difference compared with the old design.

-    </para>

-

-    <para>

-The entry points for drawing operations are already taken care of by

-the framebuffer code (including, XAA).  Extensions and enhancements to

-framebuffer code are outside the scope of this document.

-    </para>

-

-    <para>

-This approach to the driver interface provides good flexibility, but does

-increase the complexity of drivers.  To help address this, the XFree86

-common layer provides a set of <quote>helper</quote> functions to take care of things

-that most drivers need.  These helpers help minimise the amount of code

-duplication between drivers.  The use of helper functions by drivers is

-however optional, though encouraged.  The basic philosophy behind the

-helper functions is that they should be useful to many drivers, that

-they should balance this against the complexity of their interface.  It

-is inevitable that some drivers may find some helpers unsuitable and

-need to provide their own code.

-    </para>

-

-    <para>

-Events that a driver needs to react to are:

-

-      <variablelist>

-	<varlistentry><term>ScreenInit</term>

-

-	  <listitem><para>

-     An initialisation function is called from the DIX layer for each

-     screen at the start of each server generation.

-	    </para></listitem></varlistentry>

-

-	<varlistentry><term>Enter VT</term>

-

-	  <listitem><para>

-     The server takes control of the console.

-	    </para></listitem></varlistentry>

-

-	<varlistentry><term>Leave VT</term>

-

-	  <listitem><para>

-     The server releases control of the console.

-	    </para></listitem></varlistentry>

-

-	<varlistentry><term>Mode Switch</term>

-

-	  <listitem><para>

-     Change video mode.

-	    </para></listitem></varlistentry>

-

-	<varlistentry><term>ViewPort change</term>

-

-	  <listitem><para>

-     Change the origin of the physical view port.

-	    </para></listitem></varlistentry>

-

-	<varlistentry><term>ScreenSaver state change</term>

-

-	  <listitem><para>

-     Screen saver activation/deactivation.

-	    </para></listitem></varlistentry>

-

-	<varlistentry><term>CloseScreen</term>

-

-	  <listitem><para>

-     A close screen function is called from the DIX layer for each screen

-     at the end of each server generation.

-	    </para></listitem></varlistentry>

-      </variablelist>

-    </para>

-

-

-    <para>

-In addition to these events, the following functions are required by

-the XFree86 common layer:

-

-      <variablelist>

-	<varlistentry><term>Identify</term>

-

-	  <listitem><para>

-     Print a driver identifying message.

-	    </para></listitem></varlistentry>

-

-	<varlistentry><term>Probe</term>

-

-	  <listitem><para>

-     This is how a driver identifies if there is any hardware present that

-     it knows how to drive.

-	    </para></listitem></varlistentry>

-

-	<varlistentry><term>PreInit</term>

-

-	  <listitem><para>

-     Process information from the xorg.conf file, determine the

-     full characteristics of the hardware, and determine if a valid

-     configuration is present.

-	    </para></listitem></varlistentry>

-      </variablelist>

-    </para>

-

-    <para>

-The VidMode extension also requires:

-

-      <variablelist>

-	<varlistentry><term>ValidMode</term>

-

-	  <listitem><para>

-     Identify if a new mode is usable with the current configuration.

-     The PreInit function (and/or helpers it calls) may also make use

-     of the ValidMode function or something similar.

-	    </para></listitem></varlistentry>

-      </variablelist>

-    </para>

-

-

-    <para>

-Other extensions may require other entry points.  The drivers will

-inform the common layer of these in such cases.

-    </para>

-  </sect1>

-

-  <sect1>

-    <title>Resource Access Control Introduction</title>

-

-    <para>

-Graphics devices are accessed through ranges in I/O or memory space.

-While most modern graphics devices allow relocation of such ranges many

-of them still require the use of well established interfaces such as

-VGA memory and IO ranges or 8514/A IO ranges.  With modern buses (like

-PCI) it is possible for multiple video devices to share access to these

-resources.  The RAC (Resource Access Control) subsystem provides a

-mechanism for this.

-    </para>

-

-    <sect2>

-      <title>Terms and Definitions</title>

-

-      <sect3>

-	<title>Bus</title>

-

-	<para>

-    <quote>Bus</quote> is ambiguous as it is used for different things: it may refer

-    to physical incompatible extension connectors in a computer system.

-    The RAC system knows two such systems: The ISA bus and the PCI bus.

-    (On the software level EISA, MCA and VL buses are currently treated

-    like ISA buses).  <quote>Bus</quote> may also refer to logically different

-    entities on a single bus system which are connected via bridges.  A

-    PCI system may have several distinct PCI buses connecting each other

-    by PCI-PCI bridges or to the host CPU by HOST-PCI bridges.

-	</para>

-

-	<para>

-    Systems that host more than one bus system link these together using

-    bridges.  Bridges are a concern to RAC as they might block or pass

-    specific resources.  PCI-PCI bridges may be set up to pass VGA

-    resources to the secondary bus.  PCI-ISA buses pass any resources not

-    decoded on the primary PCI bus to the ISA bus.  This way VGA resources

-    (although exclusive on the ISA bus) can be shared by ISA and PCI

-    cards.  Currently HOST-PCI bridges are not yet handled by RAC as they

-    require specific drivers.

-	</para>

-      </sect3>

-

-      <sect3>

-	<title>Entity</title>

-

-	<para>

-    The smallest independently addressable unit on a system bus is

-    referred to as an entity.  So far we know ISA and PCI entities.  PCI

-    entities can be located on the PCI bus by an unique ID consisting of

-    the bus, card and function number.

-	</para>

-      </sect3>

-

-      <sect3>

-	<title>Resource</title>

-

-	<para>

-    <quote>Resource</quote> refers to a range of memory or I/O addresses an entity

-    can decode.

-	</para>

-

-	<para>

-    If a device is capable of disabling this decoding the resource is

-    called sharable.  For PCI devices a generic method is provided to

-    control resource decoding.  Other devices will have to provide a

-    device specific function to control decoding.

-	</para>

-

-	<para>

-    If the entity is capable of decoding this range at a different

-    location this resource is considered relocatable.

-	</para>

-

-	<para>

-    Resources which start at a specific address and occupy a single

-    continuous range are called block resources.

-	</para>

-

-	<para>

-    Alternatively resource addresses can be decoded in a way that they

-    satisfy the conditions:

-	  <programlisting>

-                    address &amp; mask == base

-	  </programlisting>

-    and

-	  <programlisting>

-                       base &amp; mask == base

-	  </programlisting>

-    Resources addressed in such a way are called sparse resources.

-	</para>

-

-      </sect3>

-

-      <sect3>

-	<title>Server States</title>

-

-	<para>

-    The resource access control system knows two server states: the

-    SETUP and the OPERATING state.  The SETUP state is entered whenever

-    a mode change takes place or the server exits or does VT switching.

-    During this state all entity resources are under resource access

-    control.  During OPERATING state only those entities are controlled

-    which actually have shared resources that conflict with others.

-	</para>

-      </sect3>

-    </sect2>

-  </sect1>

-

-  <sect1>

-    <title>Control Flow in the Server and Mandatory Driver Functions</title>

-

-    <para>

-At the start of each server generation, <function>main()</function>

-(<filename>dix/main.c</filename>) calls the DDX function

-<function>InitOutput()</function>.  This is the first place that the DDX gets

-control.  <function>InitOutput()</function> is expected to fill in the global

-<structname>screenInfo</structname> struct, and one

-<structfield>screenInfo.screen[]</structfield> entry for each screen present.

-Here is what <function>InitOutput()</function> does:

-    </para>

-

-    <sect2>

-      <title>Parse the xorg.conf file</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    The xorg.conf file is read in full, and the resulting information

-    stored in data structures.  None of the parsed information is

-    processed at this point.  The parser data structures are opaque to

-    the video drivers and to most of the common layer code.

-      </para>

-

-      <para>

-    The entire file is parsed first to remove any section ordering

-    requirements.

-      </para>

-    </sect2>

-

-

-    <sect2>

-      <title>Initial processing of parsed information and command line options

-      </title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    The initial processing is to determine paths like the

-    <emphasis>ModulePath</emphasis>, etc, and to determine which &k.serverlayout;,

-    &k.screen; and &k.device; sections are active.

-      </para>

-    </sect2>

-

-

-    <sect2>

-      <title>Enable port I/O access</title>

-

-      <para>

-    Port I/O access is controlled from the XFree86 common layer, and is

-    <quote>all or nothing</quote>.  It is enabled prior to calling driver probes, at

-    the start of subsequent server generations, and when VT switching

-    back to the Xserver.  It is disabled at the end of server generations,

-    and when VT switching away from the Xserver.

-      </para>

-

-      <para>

-    The implementation details of this may vary on different platforms.

-      </para>

-    </sect2>

-

-

-    <sect2>

-      <title>General bus probe</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    In the case of ix86 machines, this will be a general PCI probe.

-    The full information obtained here will be available to the drivers.

-    This information persists for the life of the Xserver.  In the PCI

-    case, the PCI information for all video cards found is available by

-    calling <function>xf86GetPciVideoInfo()</function>.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    pciVideoPtr *xf86GetPciVideoInfo(void);

-	  </programlisting>

-	  <blockquote><para>

-	returns a pointer to a list of pointers to

-	<structname>pciVideoRec</structname> entries, of which there is one for

-	each detected PCI video card.  The list is terminated with a

-	<constant>NULL</constant> pointer.  If no PCI video cards were

-	detected, the return value is <constant>NULL</constant>.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-      <para>

-    After the bus probe, the resource broker is initialised.

-      </para>

-    </sect2>

-

-

-    <sect2>

-      <title>Load initial set of modules</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    The core server contains a list of mandatory modules.  These are loaded

-    first.  Currently the only module on this list is the bitmap font module.

-      </para>

-

-      <para>

-    The next set of modules loaded are those specified explicitly in the

-    &k.module; section of the config file.

-      </para>

-

-      <para>

-    The final set of initial modules are the driver modules referenced

-    by the active &k.device; and &k.inputdevice; sections in the config

-    file.  Each of these modules is loaded exactly once.

-      </para>

-    </sect2>

-

-

-    <sect2>

-      <title>Register Video and Input Drivers</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    When a driver module is loaded, the loader calls its

-    <function>Setup</function> function.  For video drivers, this function

-    calls <function>xf86AddDriver()</function> to register the driver's

-    <structname>DriverRec</structname>, which contains a small set of essential

-    details and driver entry points required during the early phase of

-    <function>InitOutput()</function>.  <function>xf86AddDriver()</function>

-    adds it to the global <varname>xf86DriverList[]</varname> array.

-      </para>

-

-      <para>

-    The <structname>DriverRec</structname> contains the driver canonical name,

-    the <function>Identify()</function>,

-    <function>Probe()</function> and <function>AvailableOptions()</function>

-    function entry points as well as a pointer

-    to the driver's module (as returned from the loader when the driver

-    was loaded) and a reference count which keeps track of how many

-    screens are using the driver.  The entry driver entry points are

-    those required prior to the driver allocating and filling in its

-    <structname>ScrnInfoRec</structname>.

-      </para>

-

-      <para>

-    For a static server, the <varname>xf86DriverList[]</varname> array is

-    initialised at build time, and the loading of modules is not done.

-      </para>

-

-      <para>

-    A similar procedure is used for input drivers.  The input driver's

-    <function>Setup</function> function calls

-    <function>xf86AddInputDriver()</function> to register the driver's

-    <structname>InputDriverRec</structname>, which contains a small set of

-    essential details and driver entry points required during the early

-    phase of <function>InitInput()</function>.

-    <function>xf86AddInputDriver()</function> adds it to the global

-    <varname>xf86InputDriverList[]</varname> array.  For a static server,

-    the <varname>xf86InputDriverList[]</varname> array is initialised at

-    build time.

-      </para>

-

-      <para>

-    Both the <varname>xf86DriverList[]</varname> and

-    <varname>xf86InputDriverList[]</varname> arrays have been initialised

-    by the end of this stage.

-      </para>

-

-      <para>

-    Once all the drivers are registered, their

-    <function>ChipIdentify()</function> functions are called.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    void ChipIdentify(int flags);

-	  </programlisting>

-	  <blockquote><para>

-      This is expected to print a message indicating the driver name,

-      a short summary of what it supports, and a list of the chipset

-      names that it supports.  It may use the xf86PrintChipsets() helper

-      to do this.

-	    </para></blockquote>

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86PrintChipsets(const char *drvname, const char *drvmsg,

-                           SymTabPtr chips);

-	  </programlisting>

-	  <blockquote><para>

-      This function provides an easy way for a driver's ChipIdentify

-      function to format the identification message.

-	    </para></blockquote>

-	</para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Initialise Access Control</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    The Resource Access Control (RAC) subsystem is initialised before

-    calling any driver functions that may access hardware.  All generic

-    bus information is probed and saved (for restoration later).  All

-    (shared resource) video devices are disabled at the generic bus

-    level, and a probe is done to find the <quote>primary</quote> video device.  These

-    devices remain disabled for the next step.

-      </para>

-    </sect2>

-

-

-    <sect2 id="probe">

-      <title>Video Driver Probe</title>

-

-      <para>

-    This is done at the start of the first server generation only.  The

-    <function>ChipProbe()</function> function of each registered video driver

-    is called.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool ChipProbe(DriverPtr drv, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      The purpose of this is to identify all instances of hardware

-      supported by the driver.  The flags value is currently either 0,

-      <constant>PROBE_DEFAULT</constant> or <constant>PROBE_DETECT</constant>.

-      <constant>PROBE_DETECT</constant> is used if "-configure" or "-probe"

-      command line arguments are given and indicates to the

-      <function>Probe()</function> function that it should not configure the

-      bus entities and that no xorg.conf information is available.

-	    </para>

-

-	  <para>

-      The probe must find the active device sections that match the

-      driver by calling <function>xf86MatchDevice()</function>.  The number

-      of matches found limits the maximum number of instances for this

-      driver.  If no matches are found, the function should return

-      <constant>FALSE</constant> immediately.

-	  </para>

-

-	<para>

-      Devices that cannot be identified by using device-independent

-      methods should be probed at this stage (keeping in mind that access

-      to all resources that can be disabled in a device-independent way

-      are disabled during this phase).  The probe must be a minimal

-      probe.  It should just determine if there is a card present that

-      the driver can drive.  It should use the least intrusive probe

-      methods possible.  It must not do anything that is not essential,

-      like probing for other details such as the amount of memory

-      installed, etc.  It is recommended that the

-      <function>xf86MatchPciInstances()</function> helper function be used

-      for identifying matching PCI devices, and similarly the

-      <function>xf86MatchIsaInstances()</function> for ISA (non-PCI) devices

-      (see the <link linkend="rac">RAC</link> section).  These helpers also

-      checks and claims the appropriate entity.  When not using the

-      helper, that should be done with <function>xf86CheckPciSlot()</function>

-      and <function>xf86ClaimPciSlot()</function> for PCI devices and

-      <function>xf86ClaimIsaSlot()</function> for ISA devices (see the

-      <link linkend="rac">RAC</link> section).

-	</para>

-

-	<para>

-      The probe must register all non-relocatable resources at this

-      stage.  If a resource conflict is found between exclusive resources

-      the driver will fail immediately.  This is usually best done with

-      the <function>xf86ConfigPciEntity()</function> helper function

-      for PCI and <function>xf86ConfigIsaEntity()</function> for ISA

-      (see the <link linkend="rac">RAC</link> section).  It is possible to

-      register some entity specific functions with those helpers.  When

-      not using the helpers, the <function>xf86AddEntityToScreen()</function>

-      <function>xf86ClaimFixedResources()</function> and

-      <function>xf86SetEntityFuncs()</function> should be used instead (see

-      the <link linkend="rac">RAC</link> section).

-	</para>

-

-	<para>

-      If a chipset is specified in an active device section which the

-      driver considers relevant (ie it has no driver specified, or the

-      driver specified matches the driver doing the probe), the Probe

-      must return <constant>FALSE</constant> if the chipset doesn't match

-      one supported by the driver.

-	</para>

-

-	<para>

-      If there are no active device sections that the driver considers

-      relevant, it must return <constant>FALSE</constant>.

-	</para>

-

-	<para>

-      Allocate a <structname>ScrnInfoRec</structname> for each active instance of the

-      hardware found, and fill in the basic information, including the

-      other driver entry points.   This is best done with the

-      <function>xf86ConfigIsaEntity()</function> helper function for ISA

-      instances or <function>xf86ConfigPciEntity()</function> for PCI instances.

-      These functions allocate a <structname>ScrnInfoRec</structname> for active

-      entities. Optionally <function>xf86AllocateScreen()</function>

-      function may also be used to allocate the <structname>ScrnInfoRec</structname>.

-      Any of these functions take care of initialising fields to defined

-      <quote>unused</quote> values.

-	</para>

-

-	<para>

-      Claim the entities for each instance of the hardware found.  This

-      prevents other drivers from claiming the same hardware.

-	</para>

-

-	<para>

-      Must leave hardware in the same state it found it in, and must not

-      do any hardware initialisation.

-	</para>

-

-	<para>

-      All detection can be overridden via the config file, and that

-      parsed information is available to the driver at this stage.

-	</para>

-

-	<para>

-      Returns <constant>TRUE</constant> if one or more instances are found,

-      and <constant>FALSE</constant> otherwise.

-	</para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    int xf86MatchDevice(const char *drivername,

-                        GDevPtr **driversectlist)

-	  </programlisting>

-	  <blockquote><para>

-      This function takes the name of the driver and returns via

-      <parameter>driversectlist</parameter> a list of device sections that

-      match the driver name.  The function return value is the number

-      of matches found.  If a fatal error is encountered the return

-      value is <literal>-1</literal>.

-	    </para>

-

-	    <para>

-      The caller should use <function>xfree()</function> to free

-      <parameter>*driversectlist</parameter> when it is no longer needed.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    ScrnInfoPtr xf86AllocateScreen(DriverPtr drv, int flags)

-	  </programlisting>

-	  <blockquote><para>

-      This function allocates a new <structname>ScrnInfoRec</structname> in the

-      <varname>xf86Screens[]</varname> array.  This function is normally

-      called by the video driver <function>ChipProbe()</function> functions.

-      The return value is a pointer to the newly allocated

-      <structname>ScrnInfoRec</structname>.  The <structfield>scrnIndex</structfield>,

-      <structfield>origIndex</structfield>, <structfield>module</structfield> and

-      <structfield>drv</structfield> fields are initialised.  The reference count

-      in <parameter>drv</parameter> is incremented.  The storage for any

-      currently allocated <quote>privates</quote> pointers is also allocated and

-      the <structfield>privates</structfield> field initialised (the privates data

-      is of course not allocated or initialised).  This function never

-      returns on failure.  If the allocation fails, the server exits

-      with a fatal error.  The flags value is not currently used, and

-      should be set to zero.

-	    </para></blockquote>

-	</para></blockquote>

-

-      <para>

-    At the completion of this, a list of <structname>ScrnInfoRecs</structname>

-    have been allocated in the <varname>xf86Screens[]</varname> array, and

-    the associated entities and fixed resources have been claimed.  The

-    following <structname>ScrnInfoRec</structname> fields must be initialised at

-    this point:

-

-	<literallayout>

-          driverVersion

-          driverName

-          scrnIndex(*)

-          origIndex(*)

-          drv(*)

-          module(*)

-          name

-          Probe

-          PreInit

-          ScreenInit

-          EnterVT

-          LeaveVT

-          numEntities

-          entityList

-          access

-	</literallayout>

-

-    <literal>(*)</literal> These are initialised when the <structname>ScrnInfoRec</structname>

-    is allocated, and not explicitly by the driver.

-      </para>

-

-      <para>

-    The following <structname>ScrnInfoRec</structname> fields must be initialised

-    if the driver is going to use them:

-

-	<literallayout>

-          SwitchMode

-          AdjustFrame

-          FreeScreen

-          ValidMode

-	</literallayout>

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>Matching Screens</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    After the Probe phase is finished, there will be some number of

-    <structname>ScrnInfoRec</structname>s.  These are then matched with the active

-    &k.screen; sections in the xorg.conf, and those not having an active

-    &k.screen; section are deleted.  If the number of remaining screens

-    is 0, <function>InitOutput()</function> sets

-    <structfield>screenInfo.numScreens</structfield> to <constant>0</constant> and

-    returns.

-      </para>

-

-      <para>

-    At this point the following fields of the <structname>ScrnInfoRec</structname>s

-    must be initialised:

-

-	<literallayout>

-          confScreen

-	</literallayout>

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Allocate non-conflicting resources</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    Before calling the drivers again, the resource information collected

-    from the Probe phase is processed.  This includes checking the extent

-    of PCI resources for the probed devices, and resolving any conflicts

-    in the relocatable PCI resources.  It also reports conflicts, checks

-    bus routing issues, and anything else that is needed to enable the

-    entities for the next phase.

-      </para>

-

-      <para>

-    If any drivers registered an <function>EntityInit()</function> function

-    during the Probe phase, then they are called here.

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Sort the Screens and pre-check Monitor Information</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    The list of screens is sorted to match the ordering requested in the

-    config file.

-      </para>

-

-      <para>

-    The list of modes for each active monitor is checked against the

-    monitor's parameters.  Invalid modes are pruned.

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>PreInit</title>

-

-      <para>

-    This is done at the start of the first server generation only.

-      </para>

-

-      <para>

-    For each <structname>ScrnInfoRec</structname>, enable access to the screens entities and call

-    the <function>ChipPreInit()</function> function.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool ChipPreInit(ScrnInfoRec screen, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      The purpose of this function is to find out all the information

-      required to determine if the configuration is usable, and to

-      initialise those parts of the <structname>ScrnInfoRec</structname> that

-      can be set once at the beginning of the first server generation.

-	    </para>

-

-	    <para>

-      The number of entities registered for the screen should be checked

-      against the expected number (most drivers expect only one).  The

-      entity information for each of them should be retrieved (with

-      <function>xf86GetEntityInfo()</function>) and checked for the correct

-      bus type and that none of the sharable resources registered during

-      the Probe phase was rejected.

-	    </para>

-

-	    <para>

-      Access to resources for the entities that can be controlled in a

-      device-independent way are enabled before this function is called.

-      If the driver needs to access any resources that it has disabled

-      in an <function>EntityInit()</function> function that it registered,

-      then it may enable them here providing that it disables them before

-      this function returns.

-	    </para>

-

-	    <para>

-      This includes probing for video memory, clocks, ramdac, and all

-      other HW info that is needed.  It includes determining the

-      depth/bpp/visual and related info.  It includes validating and

-      determining the set of video modes that will be used (and anything

-      that is required to determine that).

-	    </para>

-

-	    <para>

-      This information should be determined in the least intrusive way

-      possible.  The state of the HW must remain unchanged by this

-      function.  Although video memory (including MMIO) may be mapped

-      within this function, it must be unmapped before returning.  Driver

-      specific information should be stored in a structure hooked into

-      the <structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield>

-      field.  Any other modules which require persistent data (ie data

-      that persists across server generations) should be initialised in

-      this function, and they should allocate a <quote>privates</quote> index to

-      hook their data into by calling

-      <function>xf86AllocateScrnInfoPrivateIndex()</function>.  The <quote>privates</quote>

-      data is persistent.

-	    </para>

-

-	    <para>

-      Helper functions for some of these things are provided at the

-      XFree86 common level, and the driver can choose to make use of

-      them.

-	    </para>

-

-	    <para>

-      All additional resources that the screen needs must be registered

-      here.  This should be done with

-      <function>xf86RegisterResources()</function>.  If some of the fixed

-      resources registered in the Probe phase are not needed or not

-      decoded by the hardware when in the OPERATING server state, their

-      status should be updated with

-      <function>xf86SetOperatingState()</function>.

-	    </para>

-

-	    <para>

-      Modules may be loaded at any point in this function, and all

-      modules that the driver will need must be loaded before the end

-      of this function.  Either the  <function>xf86LoadSubModule()</function>

-      or the <function>xf86LoadDrvSubModule()</function> function should be

-      used to load modules depending on whether a

-      <structname>ScrnInfoRec</structname> has been set up. A driver may unload

-      a module within this function if it was only needed temporarily,

-      and the <function>xf86UnloadSubModule()</function> function should be used

-      to do that.  Otherwise there is no need to explicitly unload modules

-      because the loader takes care of module dependencies and will

-      unload submodules automatically if/when the driver module is

-      unloaded.

-	    </para>

-

-	    <para>

-      The bulk of the <structname>ScrnInfoRec</structname> fields should be filled

-      out in this function.

-	    </para>

-

-	    <para>

-      <function>ChipPreInit()</function> returns <constant>FALSE</constant> when

-      the configuration is unusable in some way (unsupported depth, no

-      valid modes, not enough video memory, etc), and <constant>TRUE</constant>

-      if it is usable.

-	    </para>

-

-	    <para>

-      It is expected that if the <function>ChipPreInit()</function> function

-      returns <constant>TRUE</constant>, then the only reasons that subsequent

-      stages in the driver might fail are lack or resources (like xalloc

-      failures).  All other possible reasons for failure should be

-      determined by the <function>ChipPreInit()</function> function.

-	    </para></blockquote>

-	</para></blockquote>

-

-      <para>

-    The <structname>ScrnInfoRec</structname>s for screens where the <function>ChipPreInit()</function> fails are removed.

-    If none remain, <function>InitOutput()</function> sets <structfield>screenInfo.numScreens</structfield> to <constant>0</constant> and returns.

-      </para>

-

-      <para>

-    At this point, further fields of the <structname>ScrnInfoRec</structname>s would normally be

-    filled in.  Most are not strictly mandatory, but many are required

-    by other layers and/or helper functions that the driver may choose

-    to use.  The documentation for those layers and helper functions

-    indicates which they require.

-      </para>

-

-      <para>

-    The following fields of the <structname>ScrnInfoRec</structname>s should be filled in if the

-    driver is going to use them:

-

-	<literallayout>

-          monitor

-          display

-          depth

-          pixmapBPP

-          bitsPerPixel

-          weight                (&gt;8bpp only)

-          mask                  (&gt;8bpp only)

-          offset                (&gt;8bpp only)

-          rgbBits               (8bpp only)

-          gamma

-          defaultVisual

-          maxHValue

-          maxVValue

-          virtualX

-          virtualY

-          displayWidth

-          frameX0

-          frameY0

-          frameX1

-          frameY1

-          zoomLocked

-          modePool

-          modes

-          currentMode

-          progClock             (TRUE if clock is programmable)

-          chipset

-          ramdac

-          clockchip

-          numClocks             (if not programmable)

-          clock[]               (if not programmable)

-          videoRam

-          biosBase

-          memBase

-          memClk

-          driverPrivate

-          chipID

-          chipRev

-	</literallayout>

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    pointer xf86LoadSubModule(ScrnInfoPtr pScrn, const char *name);

-      and

-    pointer xf86LoadDrvSubModule(DriverPtr drv, const char *name);

-	  </programlisting>

-	  <blockquote><para>

-      Load a module that a driver depends on.  This function loads the

-      module <parameter>name</parameter> as a sub module of the driver.  The

-      return value is a handle identifying the new module.  If the load

-      fails, the return value will be <constant>NULL</constant>.  If a driver

-      needs to explicitly unload a module it has loaded in this way,

-      the return value must be saved and passed to

-      <function>xf86UnloadSubModule()</function> when unloading.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86UnloadSubModule(pointer module);

-	  </programlisting>

-	  <blockquote><para>

-      Unloads the module referenced by <parameter>module</parameter>.

-      <parameter>module</parameter> should be a pointer returned previously

-      by <function>xf86LoadSubModule()</function> or

-      <function>xf86LoadDrvSubModule()</function> .

-

-	    </para></blockquote>

-	</para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Cleaning up Unused Drivers</title>

-

-      <para>

-    At this point it is known which screens will be in use, and which

-    drivers are being used.  Unreferenced drivers (and modules they

-    may have loaded) are unloaded here.

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Consistency Checks</title>

-

-      <para>

-    The parameters that must be global to the server, like pixmap formats,

-    bitmap bit order, bitmap scanline unit and image byte order are

-    compared for each of the screens.  If a mismatch is found, the server

-    exits with an appropriate message.

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Check if Resource Control is Needed</title>

-

-      <para>

-    Determine if resource access control is needed.  This is the case

-    if more than one screen is used.  If necessary the RAC wrapper module

-    is loaded.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>AddScreen (ScreenInit)</title>

-

-      <para>

-    At this point, the valid screens are known.

-    <function>AddScreen()</function> is called for each of them, passing

-    <function>ChipScreenInit()</function> as the argument.

-    <function>AddScreen()</function> is a DIX function that allocates a new

-    <structfield>screenInfo.screen[]</structfield> entry (aka

-    <varname>pScreen</varname>), and does some basic initialisation of it.

-    It then calls the <function>ChipScreenInit()</function> function, with

-    <parameter>pScreen</parameter> as one of its arguments.  If

-    <function>ChipScreenInit()</function> returns <constant>FALSE</constant>,

-    <function>AddScreen()</function> returns <constant>-1</constant>.  Otherwise

-    it returns the index of the screen.  <function>AddScreen()</function>

-    should only fail because of programming errors or failure to allocate

-    resources (like memory).  All configuration problems should be

-    detected BEFORE this point.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool ChipScreenInit(int index, ScreenPtr pScreen,

-                        int argc, char **argv);

-	  </programlisting>

-	  <blockquote><para>

-      This is called at the start of each server generation.

-	    </para>

-

-	    <para>

-      Fill in all of <parameter>pScreen</parameter>, possibly doing some of

-      this by calling ScreenInit functions from other layers like mi,

-      framebuffers (cfb, etc), and extensions.

-	    </para>

-

-	    <para>

-      Decide which operations need to be placed under resource access

-      control.  The classes of operations are the frame buffer operations

-      (<constant>RAC_FB</constant>), the pointer operations

-      (<constant>RAC_CURSOR</constant>), the viewport change operations

-      (<constant>RAC_VIEWPORT</constant>) and the colormap operations

-      (<constant>RAC_COLORMAP</constant>).  Any operation that requires

-      resources which might be disabled during OPERATING state should

-      be set to use RAC.  This can be specified separately for memory

-      and IO resources (the <structfield>racMemFlags</structfield> and

-      <structfield>racIoFlags</structfield> fields of the <structname>ScrnInfoRec</structname>

-      respectively).

-	    </para>

-

-	    <para>

-      Map any video memory or other memory regions.

-	    </para>

-

-	    <para>

-      Save the video card state.  Enough state must be saved so that

-      the original state can later be restored.

-	    </para>

-

-	    <para>

-      Initialise the initial video mode.  The <structname>ScrnInfoRec</structname>'s

-      <structfield>vtSema</structfield> field should be set to <constant>TRUE</constant>

-      just prior to changing the video hardware's state.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-

-      <para>

-    The <function>ChipScreenInit()</function> function (or functions from other

-    layers that it calls) should allocate entries in the

-    <structname>ScreenRec</structname>'s <structfield>devPrivates</structfield> area by

-    calling <function>AllocateScreenPrivateIndex()</function> if it needs

-    per-generation storage.  Since the <structname>ScreenRec</structname>'s

-    <structfield>devPrivates</structfield> information is cleared for each server

-    generation, this is the correct place to initialise it.

-      </para>

-

-      <para>

-    After <function>AddScreen()</function> has successfully returned, the

-    following <structname>ScrnInfoRec</structname> fields are initialised:

-

-	<literallayout>

-          pScreen

-          racMemFlags

-          racIoFlags

-	</literallayout>

-      </para>

-

-      <para>

-    The <function>ChipScreenInit()</function> function should initialise the

-    <structfield>CloseScreen</structfield> and <structfield>SaveScreen</structfield> fields

-    of <parameter>pScreen</parameter>.  The old value of

-    <structfield>pScreen-&gt;CloseScreen</structfield> should be saved as part of

-    the driver's per-screen private data, allowing it to be called from

-    <function>ChipCloseScreen()</function>.  This means that the existing

-    <function>CloseScreen()</function> function is wrapped.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>Finalising RAC Initialisation</title>

-

-      <para>

-    After all the <function>ChipScreenInit()</function> functions have been

-    called, each screen has registered its RAC requirements.  This

-    information is used to determine which shared resources are requested

-    by more than one driver and set the access functions accordingly.

-    This is done following these rules:

-

-	<orderedlist>

-	  <listitem><para>

-	The sharable resources registered by each entity are compared.

-	If a resource is registered by more than one entity the entity

-	will be marked to indicate that it needs to share this resources

-	type (IO or MEM).

-	    </para></listitem>

-

-	  <listitem><para>

-        A resource marked <quote>disabled</quote> during OPERATING state will be

-        ignored entirely.

-	    </para></listitem>

-

-	  <listitem><para>

-	A resource marked <quote>unused</quote> will only conflict with an overlapping

-	resource of an other entity if the second is actually in use

-	during OPERATING state.

-	    </para></listitem>

-

-	  <listitem><para>

-	If an <quote>unused</quote> resource was found to conflict but the entity

-	does not use any other resource of this type the entire resource

-	type will be disabled for that entity.

-	    </para></listitem>

-	</orderedlist>

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Finishing InitOutput()</title>

-

-      <para>

-    At this point <function>InitOutput()</function> is finished, and all the

-    screens have been setup in their initial video mode.

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Mode Switching</title>

-

-      <para>

-    When a SwitchMode event is received, <function>ChipSwitchMode()</function>

-    is called (when it exists):

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool ChipSwitchMode(int index, DisplayModePtr mode, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      Initialises the new mode for the screen identified by

-      <parameter>index;</parameter>.  The viewport may need to be adjusted

-      also.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-    </sect2>

-

-    <sect2>

-      <title>Changing Viewport</title>

-

-      <para>

-    When a Change Viewport event is received,

-    <function>ChipAdjustFrame()</function> is called (when it exists):

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    void ChipAdjustFrame(int index, int x, int y, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      Changes the viewport for the screen identified by

-      <parameter>index;</parameter>.

-	    </para>

-

-	    <para>

-      It should be noted that many chipsets impose restrictions on where the

-      viewport may be placed in the virtual resolution, either for alignment

-      reasons, or to prevent the start of the viewport from being positioned

-      within a pixel (as can happen in a 24bpp mode).  After calculating the

-      value the chipset's panning registers need to be set to for non-DGA

-      modes, this function should recalculate the ScrnInfoRec's

-      <structfield>frameX0</structfield>, <structfield>frameY0</structfield>, <structfield>frameX1</structfield>

-      and <structfield>frameY1</structfield> fields to correspond to that value.  If

-      this is not done, switching to another mode might cause the position

-      of a hardware cursor to change.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-    </sect2>

-

-    <sect2>

-      <title>VT Switching</title>

-

-      <para>

-    When a VT switch event is received, <function>xf86VTSwitch()</function>

-    is called.  <function>xf86VTSwitch()</function> does the following:

-

-	<variablelist>

-	  <varlistentry><term>On ENTER:</term>

-	    <listitem>

-	      <itemizedlist>

-		<listitem><para>

-		    enable port I/O access

-		  </para></listitem>

-

-		<listitem><para>

-		    save and initialise the bus/resource state

-		  </para></listitem>

-

-		<listitem><para>

-		    enter the SETUP server state

-		  </para></listitem>

-

-		<listitem><para>

-		    calls <function>ChipEnterVT()</function> for each screen

-		  </para></listitem>

-

-		<listitem><para>

-		    enter the OPERATING server state

-		  </para></listitem>

-

-		<listitem><para>

-		    validate GCs

-		  </para></listitem>

-

-		<listitem><para>

-		    Restore fb from saved pixmap for each screen

-		  </para></listitem>

-

-		<listitem><para>

-		    Enable all input devices

-		  </para></listitem>

-	      </itemizedlist>

-	    </listitem>

-	  </varlistentry>

-	  <varlistentry>

-	    <term>On LEAVE:</term>

-	    <listitem>

-	      <itemizedlist>

-		<listitem><para>

-		    Save fb to pixmap for each screen

-		  </para></listitem>

-

-		<listitem><para>

-		    validate GCs

-		  </para></listitem>

-

-		<listitem><para>

-		    enter the SETUP server state

-		  </para></listitem>

-

-		<listitem><para>

-		    calls <function>ChipLeaveVT()</function> for each screen

-		  </para></listitem>

-

-		<listitem><para>

-		    disable all input devices

-		  </para></listitem>

-

-		<listitem><para>

-		    restore bus/resource state

-		  </para></listitem>

-

-		<listitem><para>

-		    disables port I/O access

-		  </para></listitem>

-	      </itemizedlist>

-	    </listitem>

-	  </varlistentry>

-	</variablelist>

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool ChipEnterVT(int index, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      This function should initialise the current video mode and

-      initialise the viewport, turn on the HW cursor if appropriate,

-      etc.

-	    </para>

-

-	    <para>

-      Should it re-save the video state before initialising the video

-      mode?

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void ChipLeaveVT(int index, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      This function should restore the saved video state.  If

-      appropriate it should also turn off the HW cursor, and invalidate

-      any pixmap/font caches.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <para>

-    Optionally, <function>ChipLeaveVT()</function> may also unmap memory

-    regions.  If so, <function>ChipEnterVT()</function> will need to remap

-    them.  Additionally, if an aperture used to access video memory is

-    unmapped and remapped in this fashion, <function>ChipEnterVT()</function>

-    will also need to notify the framebuffer layers of the aperture's new

-    location in virtual memory.  This is done with a call to the screen's

-    <function>ModifyPixmapHeader()</function> function, as follows

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    (*pScreen-&gt;ModifyPixmapHeader)(pScrn-&gt;ppix,

-                                   -1, -1, -1, -1, -1, NewApertureAddress);

-	  </programlisting>

-	  <blockquote><para>

-        where the <structfield>ppix</structfield> field in a ScrnInfoRec

-        points to the pixmap used by the screen's

-        <function>SaveRestoreImage()</function> function to hold the screen's

-        contents while switched out.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <para>

-    Other layers may wrap the <function>ChipEnterVT()</function> and

-    <function>ChipLeaveVT()</function> functions if they need to take some

-    action when these events are received.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>End of server generation</title>

-

-      <para>

-    At the end of each server generation, the DIX layer calls

-    <function>ChipCloseScreen()</function> for each screen:

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool ChipCloseScreen(int index, ScreenPtr pScreen);

-	  </programlisting>

-	  <blockquote><para>

-      This function should restore the saved video state and unmap the

-      memory regions.

-	    </para>

-

-	    <para>

-      It should also free per-screen data structures allocated by the

-      driver.  Note that the persistent data held in the

-      <structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield> field

-      should not be freed here because it is needed by subsequent server

-      generations.

-	    </para>

-

-	    <para>

-      The <structname>ScrnInfoRec</structname>'s <structfield>vtSema</structfield> field

-      should be set to <constant>FALSE</constant> once the video HW state

-      has been restored.

-	    </para>

-

-	    <para>

-      Before freeing the per-screen driver data the saved

-      <structfield>CloseScreen</structfield> value should be restored to

-      <structfield>pScreen-&gt;CloseScreen</structfield>, and that function should

-      be called after freeing the data.

-

-	    </para></blockquote>

-	</para></blockquote>

-    </sect2>

-  </sect1>

-

-  <sect1>

-    <title>Optional Driver Functions</title>

-

-    <para>

-The functions outlined here can be called from the XFree86 common layer,

-but their presence is optional.

-    </para>

-

-    <sect2>

-      <title>Mode Validation</title>

-

-      <para>

-    When a mode validation helper supplied by the XFree86-common layer is

-    being used, it can be useful to provide a function to check for hw

-    specific mode constraints:

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    ModeStatus ChipValidMode(int index, DisplayModePtr mode,

-                             Bool verbose, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      Check the passed mode for hw-specific constraints, and return the

-      appropriate status value.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-      <para>

-This function may also modify the effective timings and clock of the passed

-mode.  These have been stored in the mode's <structfield>Crtc*</structfield> and

-<structfield>SynthClock</structfield> elements, and have already been adjusted for

-interlacing, doublescanning, multiscanning and clock multipliers and dividers.

-The function should not modify any other mode field, unless it wants to modify

-the mode timings reported to the user by <function>xf86PrintModes()</function>.

-      </para>

-

-      <para>

-The function is called once for every mode in the xorg.conf Monitor section

-assigned to the screen, with <parameter>flags</parameter> set to

-<constant>MODECHECK_INITIAL</constant>.  It is subsequently called for every mode

-in the xorg.conf Display subsection assigned to the screen, with

-<parameter>flags</parameter> set to <constant>MODECHECK_FINAL</constant>.  In the second

-case, the mode will have successfully passed all other tests.  In addition,

-the <structname>ScrnInfoRec</structname>'s <structfield>virtualX</structfield>,

-<structfield>virtualY</structfield> and <structfield>displayWidth</structfield> fields will have been

-set as if the mode to be validated were to be the last mode accepted.

-      </para>

-

-      <para>

-In effect, calls with MODECHECK_INITIAL are intended for checks that do not

-depend on any mode other than the one being validated, while calls with

-MODECHECK_FINAL are intended for checks that may involve more than one mode.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>Free screen data</title>

-

-      <para>

-    When a screen is deleted prior to the completion of the ScreenInit

-    phase the <function>ChipFreeScreen()</function> function is called when defined.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    void ChipFreeScreen(int scrnindex, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      Free any driver-allocated data that may have been allocated up to

-      and including an unsuccessful <function>ChipScreenInit()</function>

-      call.  This would predominantly be data allocated by

-      <function>ChipPreInit()</function> that persists across server

-      generations.  It would include the <structfield>driverPrivate</structfield>,

-      and any <quote>privates</quote> entries that modules may have allocated.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-    </sect2>

-</sect1>

-

-  <sect1>

-    <title>Recommended driver functions</title>

-

-    <para>

-The functions outlined here are for internal use by the driver only.

-They are entirely optional, and are never accessed directly from higher

-layers.  The sample function declarations shown here are just examples.

-The interface (if any) used is up to the driver.

-    </para>

-

-    <sect2>

-      <title>Save</title>

-

-      <para>

-    Save the video state.  This could be called from <function>ChipScreenInit()</function> and

-    (possibly) <function>ChipEnterVT()</function>.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    void ChipSave(ScrnInfoPtr pScrn);

-	  </programlisting>

-	  <blockquote><para>

-      Saves the current state.  This will only be saving pre-server

-      states or states before returning to the server.  There is only

-      one current saved state per screen and it is stored in private

-      storage in the screen.

-

-	    </para></blockquote>

-	</para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Restore</title>

-

-      <para>

-    Restore the original video state.  This could be called from the

-    <function>ChipLeaveVT()</function> and <function>ChipCloseScreen()</function>

-    functions.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    void ChipRestore(ScrnInfoPtr pScrn);

-	  </programlisting>

-	  <blockquote><para>

-      Restores the saved state from the private storage.  Usually only

-      used for restoring text modes.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-    </sect2>

-

-    <sect2>

-      <title>Initialise Mode</title>

-

-      <para>

-    Initialise a video mode.  This could be called from the

-    <function>ChipScreenInit()</function>, <function>ChipSwitchMode()</function>

-    and <function>ChipEnterVT()</function> functions.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool ChipModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode);

-	  </programlisting>

-	  <blockquote><para>

-      Programs the hardware for the given video mode.

-

-	    </para></blockquote>

-	</para></blockquote>

-

-    </sect2>

-  </sect1>

-

-  <sect1>

-    <title>Data and Data Structures</title>

-

-    <sect2>

-      <title>Command line data</title>

-

-      <para>

-Command line options are typically global, and are stored in global

-variables.  These variables are read-only and are available to drivers

-via a function call interface.  Most of these command line values are

-processed via helper functions to ensure that they are treated consistently

-by all drivers.  The other means of access is provided for cases where

-the supplied helper functions might not be appropriate.

-      </para>

-

-      <para>

-Some of them are:

-

-	<literallayout>

-    xf86Verbose               verbosity level

-    xf86Bpp                   -bpp from the command line

-    xf86Depth                 -depth from the command line

-    xf86Weight                -weight from the command line

-    xf86Gamma                 -{r,g,b,}gamma from the command line

-    xf86FlipPixels            -flippixels from the command line

-    xf86ProbeOnly             -probeonly from the command line

-    defaultColorVisualClass   -cc from the command line

-	</literallayout>

-      </para>

-

-      <para>

-If we ever do allow for screen-specific command line options, we may

-need to rethink this.

-      </para>

-

-      <para>

-These can be accessed in a read-only manner by drivers with the following

-functions:

-      </para>

-

-     <blockquote><para>

-	  <programlisting>

-    int xf86GetVerbosity();

-	  </programlisting>

-	  <blockquote><para>

-      Returns the value of <varname>xf86Verbose</varname>.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-     <blockquote><para>

-	  <programlisting>

-    int xf86GetDepth();

-	  </programlisting>

-	  <blockquote><para>

-      Returns the <option>-depth</option> command line setting.  If not

-      set on the command line, <constant>-1</constant> is returned.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-     <blockquote><para>

-	  <programlisting>

-    rgb xf86GetWeight();

-	  </programlisting>

-	  <blockquote><para>

-      Returns the <option>-weight</option> command line setting.  If not

-      set on the command line, <literal remap="tt">{0, 0, 0}</literal> is returned.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Gamma xf86GetGamma();

-	  </programlisting>

-	  <blockquote><para>

-      Returns the <option>-gamma</option> or <option>-rgamma</option>,

-      <option>-ggamma</option>, <option>-bgamma</option> command line settings.

-      If not set on the command line, <literal remap="tt">{0.0, 0.0, 0.0}</literal>

-      is returned.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86GetFlipPixels();

-	  </programlisting>

-	  <blockquote><para>

-      Returns <constant>TRUE</constant> if <option>-flippixels</option> is

-      present on the command line, and <constant>FALSE</constant> otherwise.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    const char *xf86GetServerName();

-	  </programlisting>

-	  <blockquote><para>

-      Returns the name of the X server from the command line.

-	    </para></blockquote>

-

-	</para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Data handling</title>

-

-      <para>

-Config file data contains parts that are global, and parts that are

-Screen specific.  All of it is parsed into data structures that neither

-the drivers or most other parts of the server need to know about.

-      </para>

-

-      <para>

-The global data is typically not required by drivers, and as such, most

-of it is stored in the private <structname>xf86InfoRec</structname>.

-      </para>

-

-      <para>

-The screen-specific data collected from the config file is stored in

-screen, device, display, monitor-specific data structures that are separate

-from the <varname>ScrnInfoRecs</varname>, with the appropriate elements/fields

-hooked into the <varname>ScrnInfoRecs</varname> as required.  The screen

-config data is held in <structname>confScreenRec</structname>, device data in

-the <structname>GDevRec</structname>, monitor data in the <structname>MonRec</structname>,

-and display data in the <structname>DispRec</structname>.

-      </para>

-

-      <para>

-The XFree86 common layer's screen specific data (the actual data in use

-for each screen) is held in the <varname>ScrnInfoRecs</varname>.  As has

-been outlined above, the <varname>ScrnInfoRecs</varname> are allocated at probe

-time, and it is the responsibility of the Drivers' <function>Probe()</function>

-and <function>PreInit()</function> functions to finish filling them in based

-on both data provided on the command line and data provided from the

-Config file.  The precedence for this is:

-

-	<blockquote><para>

-    command line  -&gt;  config file  -&gt;  probed/default data

-	</para></blockquote>

-      </para>

-

-      <para>

-For most things in this category there are helper functions that the

-drivers can use to ensure that the above precedence is consistently

-used.

-      </para>

-

-      <para>

-As well as containing screen-specific data that the XFree86 common layer

-(including essential parts of the server infrastructure as well as helper

-functions) needs to access, it also contains some data that drivers use

-internally.  When considering whether to add a new field to the

-<structname>ScrnInfoRec</structname>, consider the balance between the convenience

-of things that lots of drivers need and the size/obscurity of the

-<structname>ScrnInfoRec</structname>.

-      </para>

-

-      <para>

-Per-screen driver specific data that cannot be accommodated with the

-static <structname>ScrnInfoRec</structname> fields is held in a driver-defined

-data structure, a pointer to which is assigned to the

-<structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield> field.  This

-is per-screen data that persists across server generations (as does the

-bulk of the static <structname>ScrnInfoRec</structname> data).  It would typically

-also include the video card's saved state.

-      </para>

-

-      <para>

-Per-screen data for other modules that the driver uses (for example,

-the XAA module) that is reset for each server generation is hooked into

-the <structname>ScrnInfoRec</structname> through it's <structfield>privates</structfield>

-field.

-      </para>

-

-      <para>

-Once it has stabilised, the data structures and variables accessible to

-video drivers will be documented here.  In the meantime, those things

-defined in the <filename>xf86.h</filename> and <filename>xf86str.h</filename>

-files are visible to video drivers.  Things defined in

-<filename>xf86Priv.h</filename> and <filename>xf86Privstr.h</filename> are NOT

-intended to be visible to video drivers, and it is an error for a driver

-to include those files.

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Accessing global data</title>

-

-      <para>

-Some other global state information that the drivers may access via

-functions is as follows:

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86ServerIsExiting();

-	  </programlisting>

-	  <blockquote><para>

-      Returns <constant>TRUE</constant> if the server is at the end of a

-      generation and is in the process of exiting, and

-      <constant>FALSE</constant> otherwise.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86ServerIsResetting();

-	  </programlisting>

-	  <blockquote><para>

-      Returns <constant>TRUE</constant> if the server is at the end of a

-      generation and is in the process of resetting, and

-      <constant>FALSE</constant> otherwise.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86ServerIsInitialising();

-	  </programlisting>

-	  <blockquote><para>

-      Returns <constant>TRUE</constant> if the server is at the beginning of

-      a generation and is in the process of initialising, and

-      <constant>FALSE</constant> otherwise.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86ServerIsOnlyProbing();

-	  </programlisting>

-	  <blockquote><para>

-      Returns <constant>TRUE</constant> if the -probeonly command line flag

-      was specified, and <constant>FALSE</constant> otherwise.

-	    </para></blockquote>

-

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86CaughtSignal();

-	  </programlisting>

-	  <blockquote><para>

-      Returns <constant>TRUE</constant> if the server has caught a signal,

-      and <constant>FALSE</constant> otherwise.

-	    </para></blockquote>

-

-	</para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Allocating private data</title>

-

-      <para>

-A driver and any module it uses may allocate per-screen private storage

-in either the <structname>ScreenRec</structname> (DIX level) or

-<structname>ScrnInfoRec</structname> (XFree86 common layer level).

-<structname>ScreenRec</structname> storage persists only for a single server

-generation, and <structname>ScrnInfoRec</structname> storage persists across

-generations for the lifetime of the server.

-      </para>

-

-      <para>

-The <structname>ScreenRec</structname> <structfield>devPrivates</structfield> data must be

-reallocated/initialised at the start of each new generation.  This is

-normally done from the <function>ChipScreenInit()</function> function, and

-Init functions for other modules that it calls.  Data allocated in this

-way should be freed by the driver's <function>ChipCloseScreen()</function>

-functions, and Close functions for other modules that it calls.  A new

-<structfield>devPrivates</structfield> entry is allocated by calling the

-<function>AllocateScreenPrivateIndex()</function> function.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    int AllocateScreenPrivateIndex();

-	  </programlisting>

-	  <blockquote><para>

-      This function allocates a new element in the

-      <structfield>devPrivates</structfield> field of all currently existing

-      <literal remap="tt">ScreenRecs</literal>.  The return value is the index of this

-      new element in the <structfield>devPrivates</structfield> array.  The

-      <structfield>devPrivates</structfield> field is of type

-      <structname>DevUnion</structname>:

-

-	      <programlisting>

-        typedef union _DevUnion {

-            pointer             ptr;

-            long                val;

-            unsigned long       uval;

-            pointer             (*fptr)(void);

-        } DevUnion;

-	      </programlisting>

-

-      which allows the element to be used for any of the above types.

-      It is commonly used as a pointer to data that the caller allocates

-      after the new index has been allocated.

-	    </para>

-

-	    <para>

-      This function will return <constant>-1</constant> when there is an

-      error allocating the new index.

-	    </para>

-

-	  </blockquote>

-	</para></blockquote>

-

-      <para>

-The <structname>ScrnInfoRec</structname> <structfield>privates</structfield> data persists

-for the life of the server, so only needs to be allocated once.  This

-should be done from the <function>ChipPreInit()</function> function, and Init

-functions for other modules that it calls.  Data allocated in this way

-should be freed by the driver's <function>ChipFreeScreen()</function> functions,

-and Free functions for other modules that it calls.  A new

-<structfield>privates</structfield> entry is allocated by calling the

-<function>xf86AllocateScrnInfoPrivateIndex()</function> function.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    int xf86AllocateScrnInfoPrivateIndex();

-	  </programlisting>

-	  <blockquote><para>

-      This function allocates a new element in the <structfield>privates</structfield>

-      field of all currently existing <varname>ScrnInfoRecs</varname>.

-      The return value is the index of this new element in the

-      <structfield>privates</structfield> array.  The <structfield>privates</structfield>

-      field is of type <structfield>DevUnion</structfield>:

-

-	      <programlisting>

-        typedef union _DevUnion {

-            pointer             ptr;

-            long                val;

-            unsigned long       uval;

-            pointer             (*fptr)(void);

-        } DevUnion;

-	      </programlisting>

-

-      which allows the element to be used for any of the above types.

-      It is commonly used as a pointer to data that the caller allocates

-      after the new index has been allocated.

-	    </para>

-

-	    <para>

-      This function will not return when there is an error allocating

-      the new index.  When there is an error it will cause the server

-      to exit with a fatal error.  The similar function for allocation

-      privates in the <structname>ScreenRec</structname>

-      (<function>AllocateScreenPrivateIndex()</function>) differs in this

-      respect by returning <constant>-1</constant> when the allocation fails.

-	    </para>

-

-	  </blockquote>

-	</para></blockquote>

-    </sect2>

-  </sect1>

-

-  <sect1 id="rac">

-    <title>Keeping Track of Bus Resources</title>

-

-    <sect2>

-      <title>Theory of Operation</title>

-

-      <para>

-The XFree86 common layer has knowledge of generic access control mechanisms

-for devices on certain bus systems (currently the PCI bus) as well as

-of methods to enable or disable access to the buses itself.  Furthermore

-it can access information on resources decoded by these devices and if

-necessary modify it.

-      </para>

-

-      <para>

-When first starting the Xserver collects all this information, saves it

-for restoration, checks it for consistency, and if necessary, corrects

-it.  Finally it disables all resources on a generic level prior to

-calling any driver function.

-      </para>

-

-      <para>

-When the <function>Probe()</function> function of each driver is called the

-device sections are matched against the devices found in the system.

-The driver may probe devices at this stage that cannot be identified by

-using device independent methods.  Access to all resources that can be

-controlled in a device independent way is disabled.  The

-<function>Probe()</function> function should register all non-relocatable

-resources at this stage.  If a resource conflict is found between

-exclusive resources the driver will fail immediately.  Optionally the

-driver might specify an <function>EntityInit()</function>,

-<function>EntityLeave()</function> and <function>EntityEnter()</function> function.

-      </para>

-

-      <para>

-<function>EntityInit()</function> can be used to disable any shared resources

-that are not controlled by the generic access control functions.  It is

-called prior to the PreInit phase regardless if an entity is active or

-not.  When calling the <function>EntityInit()</function>,

-<function>EntityEnter()</function> and <function>EntityLeave()</function> functions

-the common level will disable access to all other entities on a generic

-level.  Since the common level has no knowledge of device specific

-methods to disable access to resources it cannot be guaranteed that

-certain resources are not decoded by any other entity until the

-<function>EntityInit()</function> or <function>EntityEnter()</function> phase is

-finished.  Device drivers should therefore register all those resources

-which they are going to disable.  If these resources are never to be

-used by any driver function they may be flagged <constant>ResInit</constant>

-so that they can be removed from the resource list after processing all

-<function>EntityInit()</function> functions.  <function>EntityEnter()</function>

-should disable decoding of all resources which are not registered as

-exclusive and which are not handled by the generic access control in

-the common level.  The difference to <function>EntityInit()</function> is

-that the latter one is only called once during lifetime of the server.

-It can therefore be used to set up variables prior to disabling resources.

-<function>EntityLeave()</function> should restore the original state when

-exiting the server or switching to a different VT.  It also needs to

-disable device specific access functions if they need to be disabled on

-server exit or VT switch.  The default state is to enable them before

-giving up the VT.

-      </para>

-

-      <para>

-In <function>PreInit()</function> phase each driver should check if any

-sharable resources it has registered during <function>Probe()</function> has

-been denied and take appropriate action which could simply be to fail.

-If it needs to access resources it has disabled during

-<function>EntitySetup()</function> it can do so provided it has registered

-these and will disable them before returning from

-<function>PreInit()</function>.  This also applies to all other driver

-functions.  Several functions are provided to request resource ranges,

-register these, correct PCI config space and add replacements for the

-generic access functions.  Resources may be marked <quote>disabled</quote> or

-<quote>unused</quote> during OPERATING stage.  Although these steps could also be

-performed in <function>ScreenInit()</function>, this is not desirable.

-      </para>

-

-      <para>

-Following <function>PreInit()</function> phase the common level determines

-if resource access control is needed.  This is the case if more than

-one screen is used.  If necessary the RAC wrapper module is loaded.  In

-<function>ScreenInit()</function> the drivers can decide which operations

-need to be placed under RAC.  Available are the frame buffer operations,

-the pointer operations and the colormap operations.  Any operation that

-requires resources which might be disabled during OPERATING state should

-be set to use RAC.  This can be specified separately for memory and IO

-resources.

-      </para>

-

-      <para>

-When <function>ScreenInit()</function> phase is done the common level will

-determine which shared resources are requested by more than one driver

-and set the access functions accordingly.  This is done following these

-rules:

-

-	<orderedlist>

-	  <listitem><para>

-   The sharable resources registered by each entity are compared.  If

-   a resource is registered by more than one entity the entity will be

-   marked to need to share this resources type (<constant>IO</constant> or

-   <constant>MEM</constant>).

-	    </para></listitem>

-

-	  <listitem><para>

-   A resource marked <quote>disabled</quote> during OPERATING state will be ignored

-   entirely.

-	    </para></listitem>

-

-	  <listitem><para>

-   A resource marked <quote>unused</quote> will only conflicts with an overlapping

-   resource of an other entity if the second is actually in use during

-   OPERATING state.

-	    </para></listitem>

-

-	  <listitem><para>

-   If an <quote>unused</quote> resource was found to conflict however the entity

-   does not use any other resource of this type the entire resource type

-   will be disabled for that entity.

-	    </para></listitem>

-	</orderedlist>

-      </para>

-

-      <para>

-The driver has the choice among different ways to control access to

-certain resources:

-

-	<orderedlist>

-	  <listitem><para>

-   It can rely on the generic access functions.  This is probably the

-   most common case.  Here the driver only needs to register any resource

-   it is going to use.

-	    </para></listitem>

-

-	  <listitem><para>

-   It can replace the generic access functions by driver specific

-   ones.  This will mostly be used in cases where no generic access

-   functions are available.  In this case the driver has to make sure

-   these resources are disabled when entering the <function>PreInit()</function>

-   stage.  Since the replacement functions are registered in

-   <function>PreInit()</function> the driver will have to enable these

-   resources itself if it needs to access them during this state.  The

-   driver can specify if the replacement functions can control memory

-   and/or I/O resources separately.

-	    </para></listitem>

-

-	  <listitem><para>

-   The driver can enable resources itself when it needs them.  Each

-   driver function enabling them needs to disable them before it will

-   return.  This should be used if a resource which can be controlled

-   in a device dependent way is only required during SETUP state.  This

-   way it can be marked <quote>unused</quote> during OPERATING state.

-	    </para></listitem>

-	</orderedlist>

-      </para>

-

-      <para>

-A resource which is decoded during OPERATING state however never accessed

-by the driver should be marked unused.

-      </para>

-

-      <para>

-Since access switching latencies are an issue during Xserver operation,

-the common level attempts to minimize the number of entities that need

-to be placed under RAC control.  When a wrapped operation is called,

-the <function>EnableAccess()</function> function is called before control is

-passed on.  <function>EnableAccess()</function> checks if a screen is under

-access control.  If not it just establishes bus routing and returns.

-If the screen needs to be under access control,

-<function>EnableAccess()</function> determines which resource types

-(<literal remap="tt">MEM</literal>, <literal remap="tt">IO</literal>) are required.  Then it tests

-if this access is already established.  If so it simply returns.  If

-not it disables the currently established access, fixes bus routing and

-enables access to all entities registered for this screen.

-      </para>

-

-      <para>

-Whenever a mode switch or a VT-switch is performed the common level will

-return to SETUP state.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>Resource Types</title>

-

-      <para>

-Resource have certain properties.  When registering resources each range

-is accompanied by a flag consisting of the ORed flags of the different

-properties the resource has.  Each resource range may be classified

-according to

-

-	<itemizedlist>

-	  <listitem><para>

-       its physical properties i.e., if it addresses

-       memory (<constant>ResMem</constant>)  or

-       I/O space (<constant>ResIo</constant>),

-	    </para></listitem>

-	  <listitem><para>

-       if it addresses a

-       block (<constant>ResBlock</constant>) or

-       sparse (<constant>ResSparse</constant>)

-       range,

-	    </para></listitem>

-	  <listitem><para>

-       its access properties.

-	    </para></listitem>

-	</itemizedlist>

-      </para>

-

-      <para>

-There are two known access properties:

-

-	<itemizedlist>

-	  <listitem><para>

-  <constant>ResExclusive</constant>

-    for resources which may not be shared with any other device and

-	    </para></listitem>

-	  <listitem><para>

-  <constant>ResShared</constant>

-    for resources which can be disabled and therefore can be shared.

-	    </para></listitem>

-	</itemizedlist>

-      </para>

-

-      <para>

-If it is necessary to test a resource against any type a generic access

-type <constant>ResAny</constant> is provided.  If this is set the resource

-will conflict with any resource of a different entity intersecting its

-range.  Further it can be specified that a resource is decoded however

-never used during any stage (<constant>ResUnused</constant>) or during

-OPERATING state (<constant>ResUnusedOpr</constant>).  A resource only visible

-during the init functions (ie.  <function>EntityInit()</function>,

-<function>EntityEnter()</function> and <function>EntityLeave()</function> should

-be registered with the flag <constant>ResInit</constant>.  A resource that

-might conflict with background resource ranges may be flagged with

-<constant>ResBios</constant>.  This might be useful when registering resources

-ranges that were assigned by the system Bios.

-      </para>

-

-      <para>

-Several predefined resource lists are available for VGA and 8514/A

-resources in <filename>common/xf86Resources.h</filename>.

-      </para>

-    </sect2>

-

-    <sect2 id="avail">

-      <title>Available Functions</title>

-

-      <para>

-The functions provided for resource management are listed in their order

-of use in the driver.

-      </para>

-

-      <sect3>

-	<title>Probe Phase</title>

-

-	<para>

-In this phase each driver detects those resources it is able to drive,

-creates an entity record for each of them, registers non-relocatable

-resources and allocates screens and adds the resources to screens.

-	</para>

-

-	<para>

-Two helper functions are provided for matching device sections in the

-xorg.conf file to the devices:

-	</para>

-

-	<blockquote><para>

-	    <programlisting>

-    int xf86MatchPciInstances(const char *driverName, int vendorID,

-                              SymTabPtr chipsets, PciChipsets *PCIchipsets,

-                              GDevPtr *devList, int numDevs, DriverPtr drvp,

-                              int **foundEntities);

-	    </programlisting>

-	    <blockquote><para>

-      This function finds matches between PCI cards that a driver supports

-      and config file device sections.  It is intended for use in the

-      <function>ChipProbe()</function> function of drivers for PCI cards.

-      Only probed PCI devices with a vendor ID matching

-      <parameter>vendorID</parameter> are considered.  <parameter>devList</parameter>

-      and <parameter>numDevs</parameter> are typically those found from

-      calling <function>xf86MatchDevice()</function>, and represent the active

-      config file device sections relevant to the driver.

-      <parameter>PCIchipsets</parameter> is a table that provides a mapping

-      between the PCI device IDs, the driver's internal chipset tokens

-      and a list of fixed resources.

-	      </para>

-

-	      <para>

-      When a device section doesn't have a <emphasis>BusID</emphasis> entry it

-      can only match the primary video device.  Secondary devices are

-      only matched with device sections that have a matching

-      <emphasis>BusID</emphasis> entry.

-	      </para>

-

-	      <para>

-      Once the preliminary matches have been found, a final match is

-      confirmed by checking if the chipset override, ChipID override or

-      probed PCI chipset type match one of those given in the

-      <parameter>chipsets</parameter> and <parameter>PCIchipsets</parameter> lists.

-      The <parameter>PCIchipsets</parameter> list includes a list of the PCI

-      device IDs supported by the driver.  The list should be terminated

-      with an entry with PCI ID <constant>-1</constant>".  The

-      <parameter>chipsets</parameter> list is a table mapping the driver's

-      internal chipset tokens to names, and should be terminated with

-      a <constant>NULL</constant> entry.  Only those entries with a

-      corresponding entry in the <parameter>PCIchipsets</parameter> list are

-      considered.  The order of precedence is: config file chipset,

-      config file ChipID, probed PCI device ID.

-	      </para>

-

-	      <para>

-      In cases where a driver handles PCI chipsets with more than one

-      vendor ID, it may set <parameter>vendorID</parameter> to

-      <constant>0</constant>, and OR each devID in the list with (the

-      vendor&nbsp;ID&nbsp;&lt;&lt;&nbsp;16).

-	      </para>

-

-	      <para>

-      Entity index numbers for confirmed matches are returned as an

-      array via <parameter>foundEntities</parameter>.  The PCI information,

-      chipset token and device section for each match are found in the

-      <structname>EntityInfoRec</structname> referenced by the indices.

-	      </para>

-

-	      <para>

-      The function return value is the number of confirmed matches.  A

-      return value of <constant>-1</constant> indicates an internal error.

-      The returned <parameter>foundEntities</parameter> array should be freed

-      by the driver with <function>xfree()</function> when it is no longer

-      needed in cases where the return value is greater than zero.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    int xf86MatchIsaInstances(const char *driverName,

-                              SymTabPtr chipsets, IsaChipsets *ISAchipsets,

-                              DriverPtr drvp, FindIsaDevProc FindIsaDevice,

-                              GDevPtr *devList, int numDevs,

-                              int **foundEntities);

-	    </programlisting>

-	    <blockquote><para>

-      This function finds matches between ISA cards that a driver supports

-      and config file device sections.  It is intended for use in the

-      <function>ChipProbe()</function> function of drivers for ISA cards.

-      <parameter>devList</parameter> and <parameter>numDevs</parameter> are

-      typically those found from calling <function>xf86MatchDevice()</function>,

-      and represent the active config file device sections relevant to

-      the driver.  <parameter>ISAchipsets</parameter> is a table that provides

-      a mapping between the driver's internal chipset tokens and the

-      resource classes.  <parameter>FindIsaDevice</parameter> is a

-      driver-provided function that probes the hardware and returns the

-      chipset token corresponding to what was detected, and

-      <constant>-1</constant> if nothing was detected.

-	      </para>

-

-	      <para>

-      If the config file device section contains a chipset entry, then

-      it is checked against the <parameter>chipsets</parameter> list.  When

-      no chipset entry is present, the <parameter>FindIsaDevice</parameter>

-      function is called instead.

-	      </para>

-

-	      <para>

-      Entity index numbers for confirmed matches are returned as an

-      array via <parameter>foundEntities</parameter>.  The chipset token and

-      device section for each match are found in the

-      <structname>EntityInfoRec</structname> referenced by the indices.

-	      </para>

-

-	      <para>

-      The function return value is the number of confirmed matches.  A

-      return value of <constant>-1</constant> indicates an internal error.

-      The returned <parameter>foundEntities</parameter> array should be freed

-      by the driver with <function>xfree()</function> when it is no longer

-      needed in cases where the return value is greater than zero.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<para>

-These two helper functions make use of several core functions that are

-available at the driver level:

-	</para>

-

-	<blockquote><para>

-	    <programlisting>

-    Bool xf86ParsePciBusString(const char *busID, int *bus,

-                               int *device, int *func);

-	    </programlisting>

-	    <blockquote><para>

-      Takes a <parameter>BusID</parameter> string, and if it is in the correct

-      format, returns the PCI <parameter>bus</parameter>, <parameter>device</parameter>,

-      <parameter>func</parameter> values that it indicates.  The format of the

-      string is expected to be "PCI:bus:device:func" where each of <quote>bus</quote>,

-      <quote>device</quote> and <quote>func</quote> are decimal integers.  The ":func" part may

-      be omitted, and the func value assumed to be zero, but this isn't

-      encouraged.  The "PCI" prefix may also be omitted.  The prefix

-      "AGP" is currently equivalent to the "PCI" prefix.  If the string

-      isn't a valid PCI BusID, the return value is <constant>FALSE</constant>.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    Bool xf86ComparePciBusString(const char *busID, int bus,

-                                 int device, int func);

-	    </programlisting>

-	    <blockquote><para>

-      Compares a <parameter>BusID</parameter> string with PCI <parameter>bus</parameter>,

-      <parameter>device</parameter>, <parameter>func</parameter> values.  If they

-      match <constant>TRUE</constant> is returned, and <constant>FALSE</constant>

-      if they don't.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    Bool xf86ParseIsaBusString(const char *busID);

-	    </programlisting>

-	    <blockquote><para>

-      Compares a <parameter>BusID</parameter> string with the ISA bus ID string

-      ("ISA" or "ISA:").  If they match <constant>TRUE</constant> is returned,

-      and <constant>FALSE</constant> if they don't.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    Bool xf86CheckPciSlot(int bus, int device, int func);

-	    </programlisting>

-	    <blockquote><para>

-      Checks if the PCI slot <literal remap="tt">bus:device:func</literal> has been

-      claimed.  If so, it returns <constant>FALSE</constant>, and otherwise

-      <constant>TRUE</constant>.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    int xf86ClaimPciSlot(int bus, int device, int func, DriverPtr drvp,

-                         int chipset, GDevPtr dev, Bool active);

-	    </programlisting>

-	    <blockquote><para>

-      This function is used to claim a PCI slot, allocate the associated

-      entity record and initialise their data structures.  The return

-      value is the index of the newly allocated entity record, or

-      <constant>-1</constant> if the claim fails.  This function should always

-      succeed if <function>xf86CheckPciSlot()</function> returned

-      <constant>TRUE</constant> for the same PCI slot.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    Bool xf86IsPrimaryPci(void);

-	    </programlisting>

-	    <blockquote><para>

-      This function returns <constant>TRUE</constant> if the primary card is

-      a PCI device, and <constant>FALSE</constant> otherwise.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    int xf86ClaimIsaSlot(DriverPtr drvp, int chipset,

-                         GDevPtr dev, Bool active);

-	    </programlisting>

-	    <blockquote><para>

-      This allocates an entity record entity and initialise the data

-      structures.  The return value is the index of the newly allocated

-      entity record.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    Bool xf86IsPrimaryIsa(void);

-	    </programlisting>

-	    <blockquote><para>

-      This function returns <constant>TRUE</constant> if the primary card is

-      an ISA (non-PCI) device, and <constant>FALSE</constant> otherwise.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<para>

-Two helper functions are provided to aid configuring entities:

-	</para>

-

-	<blockquote><para>

-	    <programlisting>

-    ScrnInfoPtr xf86ConfigPciEntity(ScrnInfoPtr pScrn,

-                                    int scrnFlag, int entityIndex,

-                                    PciChipsets *p_chip,

-                                    resList res, EntityProc init,

-                                    EntityProc enter, EntityProc leave,

-                                    pointer private);

-

-    ScrnInfoPtr xf86ConfigIsaEntity(ScrnInfoPtr pScrn,

-                                    int scrnFlag, int entityIndex,

-                                    IsaChipsets *i_chip,

-                                    resList res, EntityProc init,

-                                    EntityProc enter, EntityProc leave,

-                                    pointer private);

-	    </programlisting>

-	    <blockquote><para>

-      These functions are used to register the non-relocatable resources

-      for an entity, and the optional entity-specific <parameter>Init</parameter>, <parameter>Enter</parameter> and

-      <parameter>Leave</parameter> functions.  Usually the list of fixed resources is obtained

-      from the Isa/PciChipsets lists.  However an additional list of

-      resources may be passed.  Generally this is not required.

-      For active entities a <structname>ScrnInfoRec</structname> is allocated

-      if the <parameter>pScrn</parameter> argument is <constant>NULL</constant>.

-The

-      return value is <constant>TRUE</constant> when successful.  The init, enter, leave

-      functions are defined as follows:

-

-		<blockquote><para>

-		    <programlisting>

-        typedef void (*EntityProc)(int entityIndex,

-                                   pointer private);

-		    </programlisting>

-		  </para></blockquote>

-

-      They are passed the entity index and a pointer to a private scratch

-      area.  This can be set up during <function>Probe()</function> and

-      its address can be passed to

-      <function>xf86ConfigIsaEntity()</function> and

-      <function>xf86ConfigPciEntity()</function> as the last argument.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<para>

-These two helper functions make use of several core functions that are

-available at the driver level:

-

-	  <blockquote><para>

-	      <programlisting>

-    void xf86ClaimFixedResources(resList list, int entityIndex);

-	      </programlisting>

-	      <blockquote><para>

-      This function registers the non-relocatable resources which cannot

-      be disabled and which therefore would cause the server to fail

-      immediately if they were found to conflict.  It also records

-      non-relocatable but sharable resources for processing after the

-      <function>Probe()</function> phase.

-		</para>

-

-	      </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    Bool xf86SetEntityFuncs(int entityIndex, EntityProc init,

-                            EntityProc enter, EntityProc leave, pointer);

-	      </programlisting>

-	      <blockquote><para>

-      This function registers with an entity the <parameter>init</parameter>,

-      <parameter>enter</parameter>, <parameter>leave</parameter> functions along

-      with the pointer to their private area.

-		</para>

-

-	    </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    void xf86AddEntityToScreen(ScrnInfoPtr pScrn, int entityIndex);

-	      </programlisting>

-	      <blockquote><para>

-      This function associates the entity referenced by

-      <parameter>entityIndex</parameter> with the screen.

-		</para>

-

-	      </blockquote></para></blockquote>

-	</para>

-      </sect3>

-

-      <sect3>

-	<title>PreInit Phase</title>

-

-	<para>

-During this phase the remaining resources should be registered.

-<function>PreInit()</function> should call <function>xf86GetEntityInfo()</function>

-to obtain a pointer to an <structname>EntityInfoRec</structname> for each entity

-it is able to drive and check if any resource are listed in its

-<structfield>resources</structfield> field.  If resources registered in the Probe

-phase have been rejected in the post-Probe phase

-(<structfield>resources</structfield> is non-<constant>NULL</constant>), then the driver should

-decide if it can continue without using these or if it should fail.

-	</para>

-

-	<blockquote><para>

-	    <programlisting>

-    EntityInfoPtr xf86GetEntityInfo(int entityIndex);

-	    </programlisting>

-	    <blockquote><para>

-      This function returns a pointer to the <structname>EntityInfoRec</structname>

-      referenced by <parameter>entityIndex</parameter>.  The returned

-      <structname>EntityInfoRec</structname> should be freed with

-      <function>xfree()</function> when no longer needed.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<para>

-Several functions are provided to simplify resource registration:

-	  <blockquote><para>

-	      <programlisting>

-    Bool xf86IsEntityPrimary(int entityIndex);

-	      </programlisting>

-	      <blockquote><para>

-      This function returns <constant>TRUE</constant> if the entity referenced

-      by <parameter>entityIndex</parameter> is the primary display device (i.e.,

-      the one initialised at boot time and used in text mode).

-		</para>

-

-	      </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    Bool xf86IsScreenPrimary(int scrnIndex);

-	      </programlisting>

-	      <blockquote><para>

-      This function returns <constant>TRUE</constant> if the primary entity

-      is registered with the screen referenced by

-      <parameter>scrnIndex</parameter>.

-		</para>

-

-	      </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    pciVideoPtr xf86GetPciInfoForEntity(int entityIndex);

-	      </programlisting>

-	      <blockquote><para>

-      This function returns a pointer to the <structname>pciVideoRec</structname>

-      for the specified entity.  If the entity is not a PCI device,

-      <constant>NULL</constant> is returned.

-		</para>

-

-	      </blockquote></para></blockquote>

-	</para>

-

-	<para>

-The primary function for registration of resources is:

-	  <blockquote><para>

-	      <programlisting>

-    resPtr xf86RegisterResources(int entityIndex, resList list,

-                                 int access);

-	      </programlisting>

-	      <blockquote><para>

-      This function tries to register the resources in

-      <parameter>list</parameter>.  If list is <constant>NULL</constant> it tries

-      to determine the resources automatically.  This only works for

-      entities that provide a generic way to read out the resource ranges

-      they decode.  So far this is only the case for PCI devices.  By

-      default the PCI resources are registered as shared

-      (<constant>ResShared</constant>) if the driver wants to set a different

-      access type it can do so by specifying the access flags in the

-      third argument.  A value of <constant>0</constant> means to use the

-      default settings.  If for any reason the resource broker is not

-      able to register some of the requested resources the function will

-      return a pointer to a list of the failed ones.  In this case the

-      driver may be able to move the resource to different locations.

-      In case of PCI bus entities this is done by passing the list of

-      failed resources to <function>xf86ReallocatePciResources()</function>.

-      When the registration succeeds, the return value is

-      <constant>NULL</constant>.

-		</para>

-

-	      </blockquote></para></blockquote>

-	  </para>

-

-	<blockquote><para>

-	    <programlisting>

-    resPtr xf86ReallocatePciResources(int entityIndex, resPtr pRes);

-	    </programlisting>

-	    <blockquote><para>

-      This function takes a list of PCI resources that need to be

-      reallocated and returns <constant>NULL</constant> when all relocations are

-      successful.

-      <function>xf86RegisterResources()</function> should be called again to

-      register the relocated resources with the broker.

-      If the reallocation fails, a list of the resources that could not be

-      relocated is returned.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-<para>

-Two functions are provided to obtain a resource range of a given type:

-	  <blockquote><para>

-	      <programlisting>

-    resRange xf86GetBlock(long type, memType size,

-                          memType window_start, memType window_end,

-                          memType align_mask, resPtr avoid);

-	      </programlisting>

-	      <blockquote><para>

-      This function tries to find a block range of size

-      <parameter>size</parameter> and type <parameter>type</parameter> in a window

-      bound by <parameter>window_start</parameter> and <parameter>window_end</parameter>

-      with the alignment specified in <parameter>align_mask</parameter>.

-      Optionally a list of resource ranges which should be avoided within

-      the window can be supplied.  On failure a zero-length range of

-      type <constant>ResEnd</constant> will be returned.

-		</para>

-	      </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    resRange xf86GetSparse(long type, memType fixed_bits,

-                           memType decode_mask, memType address_mask,

-                           resPtr avoid);

-	      </programlisting>

-	      <blockquote><para>

-      This function is like the previous one, but attempts to find a

-      sparse range instead of a block range.  Here three values have to

-      be specified: the <parameter>address_mask</parameter> which marks all

-      bits of the mask part of the address, the <parameter>decode_mask</parameter>

-      which masks out the bits which are hardcoded and are therefore

-      not available for relocation and the values of the fixed bits.

-      The function tries to find a base that satisfies the given condition.

-      If the function fails it will return a zero range of type

-      <constant>ResEnd</constant>.  Optionally it might be passed a list of

-      resource ranges to avoid.

-		</para>

-

-	      </blockquote></para></blockquote>

-	</para>

-

-	<para>

-Some PCI devices are broken in the sense that they return invalid size

-information for a certain resource.  In this case the driver can supply

-the correct size and make sure that the resource range allocated for

-the card is large enough to hold the address range decoded by the card.

-The function <function>xf86FixPciResource()</function> can be used to do this:

-	  <blockquote><para>

-	      <programlisting>

-    Bool xf86FixPciResource(int entityIndex, unsigned int prt,

-                            CARD32 alignment, long type);

-	      </programlisting>

-	      <blockquote><para>

-      This function fixes a PCI resource allocation.  The

-      <parameter>prt</parameter> parameter contains the number of the PCI base

-      register that needs to be fixed (<constant>0-5</constant>, and

-      <constant>6</constant> for the BIOS base register).  The size is

-      specified by the alignment.  Since PCI resources need to span an

-      integral range of size <literal remap="tt">2&circ;n</literal>, the alignm      ent also

-      specifies the number of addresses that will be decoded.  If the

-      driver specifies a type mask it can override the default type for

-      PCI resources which is <constant>ResShared</constant>.  The resource

-      broker needs to know that to find a matching resource range.  This

-      function should be called before calling

-      <function>xf86RegisterResources()</function>.  The return value is

-      <constant>TRUE</constant> when the function succeeds.

-		</para>

-

-	      </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    Bool xf86CheckPciMemBase(pciVideoPtr pPci, memType base);

-	      </programlisting>

-	      <blockquote><para>

-      This function checks that the memory base address specified matches

-      one of the PCI base address register values for the given PCI

-      device.  This is mostly used to check that an externally provided

-      base address (e.g., from a config file) matches an actual value

-      allocated to a device.

-		</para>

-

-	      </blockquote></para></blockquote>

-	</para>

-

-	<para>

-The driver may replace the generic access control functions for an entity.

-This is done with the <function>xf86SetAccessFuncs()</function>:

-	  <blockquote><para>

-	      <programlisting>

-    void xf86SetAccessFuncs(EntityInfoPtr pEnt,

-                            xf86SetAccessFuncPtr funcs,

-                            xf86SetAccessFuncPtr oldFuncs);

-	      </programlisting>

-     with:

-	      <programlisting>

-      typedef struct {

-          xf86AccessPtr mem;

-          xf86AccessPtr io;

-          xf86AccessPtr io_mem;

-      } xf86SetAccessFuncRec, *xf86SetAccessFuncPtr;

-	      </programlisting>

-	      <blockquote><para>

-      The driver can pass three functions: one for I/O access, one for

-      memory access and one for combined memory and I/O access.  If the

-      memory access and combined access functions are identical the

-      common level assumes that the memory access cannot be controlled

-      independently of I/O access, if the I/O access function and the

-      combined access functions are the same it is assumed that I/O can

-      not be controlled independently.  If memory and I/O have to be

-      controlled together all three values should be the same.  If a

-      non <constant>NULL</constant> value is passed as third argument it is

-      interpreted as an address where to store the old access record.

-      If the third argument is <constant>NULL</constant> it will be assumed

-      that the generic access should be enabled before replacing the

-      access functions.  Otherwise it will be disabled.  The driver may

-      enable them itself using the returned values.  It should do this

-      from its replacement access functions as the generic access may

-      be disabled by the common level on certain occasions.  If replacement

-      functions are specified they must control all resources of the

-      specific type registered for the entity.

-		</para>

-

-	      </blockquote></para></blockquote>

-	</para>

-

-	<para>

-To find out if a specific resource range conflicts with another

-resource the <function>xf86ChkConflict()</function> function may be used:

-	  <blockquote><para>

-	      <programlisting>

-    memType xf86ChkConflict(resRange *rgp, int entityIndex);

-	      </programlisting>

-	      <blockquote><para>

-      This function checks if the resource range <parameter>rgp</parameter> of

-      for the specified entity conflicts with with another resource.

-      If a conflict is found, the address of the start of the conflict

-      is returned.  The return value is zero when there is no conflict.

-		</para>

-

-	      </blockquote></para></blockquote>

-	</para>

-

-	<para>

-The OPERATING state properties of previously registered fixed resources

-can be set with the <function>xf86SetOperatingState()</function> function:

-	  <blockquote><para>

-	      <programlisting>

-    resPtr xf86SetOperatingState(resList list, int entityIndex,

-                                 int mask);

-	      </programlisting>

-	      <blockquote><para>

-      This function is used to set the status of a resource during

-      OPERATING state.  <parameter>list</parameter> holds a list to which

-      <parameter>mask</parameter> is to be applied.  The parameter

-      <parameter>mask</parameter> may have the value <constant>ResUnusedOpr</constant>

-      and <constant>ResDisableOpr</constant>.  The first one should be used

-      if a resource isn't used by the driver during OPERATING state

-      although it is decoded by the device, while the latter one indicates

-      that the resource is not decoded during OPERATING state.  Note

-      that the resource ranges have to match those specified during

-      registration.  If a range has been specified starting at

-      <literal remap="tt">A</literal> and ending at <literal remap="tt">B</literal> and suppose

-      <literal remap="tt">C</literal> us a value satisfying

-      <literal remap="tt">A&nbsp;&lt;&nbsp;C&nbsp;&lt;&nbsp;B</literal> one may not

-      specify the resource range <literal remap="tt">(A,B)</literal> by splitting it

-      into two ranges <literal remap="tt">(A,C)</literal> and <literal remap="tt">(C,B)</literal>.

-		</para>

-

-	      </blockquote></para></blockquote>

-	</para>

-

-	<para>

-The following two functions are provided for special cases:

-	  <blockquote><para>

-	      <programlisting>

-    void xf86RemoveEntityFromScreen(ScrnInfoPtr pScrn, int entityIndex);

-	      </programlisting>

-	      <blockquote><para>

-      This function may be used to remove an entity from a screen.  This

-      only makes sense if a screen has more than one entity assigned or

-      the screen is to be deleted.  No test is made if the screen has

-      any entities left.

-		</para>

-

-	      </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    void xf86DeallocateResourcesForEntity(int entityIndex, long type);

-	      </programlisting>

-	      <blockquote><para>

-      This function deallocates all resources of a given type registered

-      for a certain entity from the resource broker list.

-		</para>

-

-	      </blockquote></para></blockquote>

-	</para>

-

-      </sect3>

-

-      <sect3>

-	<title>ScreenInit Phase</title>

-

-	<para>

-All that is required in this phase is to setup the RAC flags.  Note that

-it is also permissible to set these flags up in the PreInit phase.  The

-RAC flags are held in the <structfield>racIoFlags</structfield> and <structfield>racMemFlags</structfield> fields of the

-<structname>ScrnInfoRec</structname> for each screen.  They specify which graphics operations

-might require the use of shared resources.  This can be specified

-separately for memory and I/O resources.  The available flags are defined

-in <filename>rac/xf86RAC.h</filename>.  They are:

-

-	  <variablelist>

-	    <varlistentry><term><constant>RAC_FB</constant></term>

-	      <listitem><para>

-	for framebuffer operations (including hw acceleration)

-		</para></listitem></varlistentry>

-	    <varlistentry><term><constant>RAC_CURSOR</constant></term>

-	      <listitem><para>

-	for Cursor operations

-        (??? I'm not sure if we need this for SW cursor it depends

-         on which level the sw cursor is drawn)

-		</para></listitem></varlistentry>

-	    <varlistentry><term><constant>RAC_COLORMAP</constant></term>

-	      <listitem><para>

-	for colormap operations

-		</para></listitem></varlistentry>

-	    <varlistentry><term><constant>RAC_VIEWPORT</constant></term>

-	      <listitem><para>

-	for the call to <function>ChipAdjustFrame()</function>

-		</para></listitem></varlistentry>

-	    </variablelist>

-

-

-The flags are ORed together.

-	</para>

-      </sect3>

-    </sect2>

-  </sect1>

-

-  <sect1 id="options">

-    <title>Config file <quote>Option</quote> entries</title>

-

-    <para>

-Option entries are permitted in most sections and subsections of the

-config file.  There are two forms of option entries:

-

-      <variablelist>

-	<varlistentry><term>Option "option-name"</term>

-	  <listitem><para>

-	A boolean option.

-	    </para></listitem></varlistentry>

-	<varlistentry><term>Option "option-name" "option-value"</term>

-	  <listitem><para>

-	An option with an arbitrary value.

-	    </para></listitem></varlistentry>

-      </variablelist>

-    </para>

-

-    <para>

-The option entries are handled by the parser, and a list of the parsed

-options is included with each of the appropriate data structures that

-the drivers have access to.  The data structures used to hold the option

-information are opaque to the driver, and a driver must not access the

-option data directly.  Instead, the common layer provides a set of

-functions that may be used to access, check and manipulate the option

-data.

-    </para>

-

-    <para>

-First, the low level option handling functions.  In most cases drivers

-would not need to use these directly.

-    </para>

-

-    <blockquote><para>

-	<programlisting>

-    pointer xf86FindOption(pointer options, const char *name);

-	</programlisting>

-	<blockquote><para>

-      Takes a list of options and an option name, and returns a handle

-      for the first option entry in the list matching the name.  Returns

-      <constant>NULL</constant> if no match is found.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    char *xf86FindOptionValue(pointer options, const char *name);

-	</programlisting>

-	<blockquote><para>

-      Takes a list of options and an option name, and returns the value

-      associated with the first option entry in the list matching the

-      name.  If the matching option has no value, an empty string

-      (<constant>""</constant>) is returned.  Returns <constant>NULL</constant>

-      if no match is found.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    void xf86MarkOptionUsed(pointer option);

-	</programlisting>

-	<blockquote><para>

-      Takes a handle for an option, and marks that option as used.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    void xf86MarkOptionUsedByName(pointer options, const char *name);

-	</programlisting>

-	<blockquote><para>

-      Takes a list of options and an option name and marks the first

-      option entry in the list matching the name as used.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <para>

-Next, the higher level functions that most drivers would use.

-    </para>

-    <blockquote><para>

-	<programlisting>

-    void xf86CollectOptions(ScrnInfoPtr pScrn, pointer extraOpts);

-	</programlisting>

-	<blockquote><para>

-      Collect the options from each of the config file sections used by

-      the screen (<parameter>pScrn</parameter>) and return the merged list as

-      <structfield>pScrn-&gt;options</structfield>.  This function requires that

-      <structfield>pScrn-&gt;confScreen</structfield>, <structfield>pScrn-&gt;display</structfield>,

-      <structfield>pScrn-&gt;monitor</structfield>,

-      <structfield>pScrn-&gt;numEntities</structfield>, and

-      <structfield>pScrn-&gt;entityList</structfield> are initialised.

-      <parameter>extraOpts</parameter> may optionally be set to an additional

-      list of options to be combined with the others.  The order of

-      precedence for options is <parameter>extraOpts</parameter>, display,

-      confScreen, monitor, device.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    void xf86ProcessOptions(int scrnIndex, pointer options,

-                            OptionInfoPtr optinfo);

-	</programlisting>

-	<blockquote><para>

-      Processes a list of options according to the information in the

-      array of <structname>OptionInfoRecs</structname> (<parameter>optinfo</parameter>).

-      The resulting information is stored in the <structfield>value</structfield>

-      fields of the appropriate <parameter>optinfo</parameter> entries.  The

-      <structfield>found</structfield> fields are set to <constant>TRUE</constant>

-      when an option with a value of the correct type if found, and

-      <constant>FALSE</constant> otherwise.  The <structfield>type</structfield> field

-      is used to determine the expected value type for each option.

-      Each option in the list of options for which there is a name match

-      (but not necessarily a value type match) is marked as used.

-      Warning messages are printed when option values don't match the

-      types specified in the optinfo data.

-	  </para>

-

-	  <para>

-      NOTE: If this function is called before a driver's screen number

-      is known (e.g., from the <function>ChipProbe()</function> function) a

-      <parameter>scrnIndex</parameter> value of <constant>-1</constant> should be

-      used.

-	  </para>

-

-	  <para>

-      NOTE 2: Given that this function stores into the

-      <literal remap="tt">OptionInfoRecs</literal> pointed to by <parameter>optinfo</parameter>,

-      the caller should ensure the <literal remap="tt">OptionInfoRecs</literal> are

-      (re-)initialised before the call, especially if the caller expects

-      to use the predefined option values as defaults.

-	  </para>

-

-	  <para>

-      The <structname>OptionInfoRec</structname> is defined as follows:

-

-	    <programlisting>

-      typedef struct {

-          double freq;

-          int units;

-      } OptFrequency;

-

-      typedef union {

-          unsigned long       num;

-          char *              str;

-          double              realnum;

-          Bool                bool;

-          OptFrequency        freq;

-      } ValueUnion;

-

-      typedef enum {

-          OPTV_NONE = 0,

-          OPTV_INTEGER,

-          OPTV_STRING,  /* a non-empty string */

-          OPTV_ANYSTR,  /* Any string, including an empty one */

-          OPTV_REAL,

-          OPTV_BOOLEAN,

-          OPTV_PERCENT,

-          OPTV_FREQ

-      } OptionValueType;

-

-      typedef enum {

-          OPTUNITS_HZ = 1,

-          OPTUNITS_KHZ,

-          OPTUNITS_MHZ

-      } OptFreqUnits;

-

-      typedef struct {

-          int                 token;

-          const char*         name;

-          OptionValueType     type;

-          ValueUnion          value;

-          Bool                found;

-      } OptionInfoRec, *OptionInfoPtr;

-	    </programlisting>

-	  </para>

-	  <para>

-      <constant>OPTV_FREQ</constant> can be used for options values that are

-      frequencies.  These values are a floating point number with an

-      optional unit name appended.  The unit name can be one of "Hz",

-      "kHz", "k", "MHz", "M".  The multiplier associated with the unit

-      is stored in <structfield>freq.units</structfield>, and the scaled frequency

-      is stored in <structfield>freq.freq</structfield>.  When no unit is specified,

-      <structfield>freq.units</structfield> is set to <constant>0</constant>, and

-      <structfield>freq.freq</structfield> is unscaled.

-	  </para>

-

-	  <para>

-      <constant>OPTV_PERCENT</constant> can be used for option values that are

-      specified in percent (e.g. "20%"). These values are a floating point

-      number with a percent sign appended. If the percent sign is missing,

-      the parser will fail to match the value.

-	  </para>

-

-	  <para>

-      Typical usage is to setup an array of

-      <structname>OptionInfoRec</structname>s with all fields initialised.

-      The <structfield>value</structfield> and <structfield>found</structfield> fields get

-      set by <function>xf86ProcessOptions()</function>.  For cases where the

-      value parsing is more complex, the driver should specify

-      <constant>OPTV_STRING</constant>, and parse the string itself.  An

-      example of using this option handling is included in the

-      <link linkend="sample">Sample Driver</link> section.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    void xf86ShowUnusedOptions(int scrnIndex, pointer options);

-	</programlisting>

-	<blockquote><para>

-      Prints out warning messages for each option in the list of options

-      that isn't marked as used.  This is intended to show options that

-      the driver hasn't recognised.  It would normally be called near

-      the end of the <function>ChipScreenInit()</function> function, but only

-      when <code>serverGeneration&nbsp;==&nbsp;1</code>

-	  </para>

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    OptionInfoPtr xf86TokenToOptinfo(const OptionInfoRec *table,

-                                     int token);

-	</programlisting>

-	<blockquote><para>

-      Returns a pointer to the <structname>OptionInfoRec</structname> in

-      <parameter>table</parameter> with a token field matching

-      <parameter>token</parameter>.  Returns <constant>NULL</constant> if no match

-      is found.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    Bool xf86IsOptionSet(const OptionInfoRec *table, int token);

-	</programlisting>

-	<blockquote><para>

-      Returns the <literal remap="tt">found</literal> field of the

-      <structname>OptionInfoRec</structname> in <parameter>table</parameter> with a

-      <structfield>token</structfield> field matching <parameter>token</parameter>.  This

-      can be used for options of all types.  Note that for options of

-      type <constant>OPTV_BOOLEAN</constant>, it isn't sufficient to check

-      this to determine the value of the option.  Returns

-      <constant>FALSE</constant> if no match is found.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    char *xf86GetOptValString(const OptionInfoRec *table, int token);

-	</programlisting>

-	<blockquote><para>

-      Returns the <structfield>value.str</structfield> field of the

-      <structname>OptionInfoRec</structname> in <parameter>table</parameter> with a

-      token field matching <parameter>token</parameter>.  Returns

-      <constant>NULL</constant> if no match is found.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    Bool xf86GetOptValInteger(const OptionInfoRec *table, int token,

-

-                                int *value);

-	      </programlisting>

-	      <blockquote><para>

-      Returns via <parameter>*value</parameter> the <structfield>value.num</structfield>

-      field of the <structname>OptionInfoRec</structname> in <parameter>table</parameter>

-      with a <structfield>token</structfield> field matching <parameter>token</parameter>.

-      <parameter>*value</parameter> is only changed when a match is found so

-      it can be safely initialised with a default prior to calling this

-      function.  The function return value is as for

-      <function>xf86IsOptionSet()</function>.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    Bool xf86GetOptValULong(const OptionInfoRec *table, int token,

-                            unsigned long *value);

-	</programlisting>

-	<blockquote><para>

-      Like <function>xf86GetOptValInteger()</function>, except the value is

-      treated as an <type>unsigned long</type>.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    Bool xf86GetOptValReal(const OptionInfoRec *table, int token,

-                           double *value);

-	</programlisting>

-	<blockquote><para>

-      Like <function>xf86GetOptValInteger()</function>, except that

-      <structfield>value.realnum</structfield> is used.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    Bool xf86GetOptValFreq(const OptionInfoRec *table, int token,

-                           OptFreqUnits expectedUnits, double *value);

-	</programlisting>

-	<blockquote><para>

-      Like <function>xf86GetOptValInteger()</function>, except that the

-      <structfield>value.freq</structfield> data is returned.  The frequency value

-      is scaled to the units indicated by <parameter>expectedUnits</parameter>.

-      The scaling is exact when the units were specified explicitly in

-      the option's value.  Otherwise, the <parameter>expectedUnits</parameter>

-      field is used as a hint when doing the scaling.  In this case,

-      values larger than <constant>1000</constant> are assumed to have be

-      specified in the next smallest units.  For example, if the Option

-      value is "10000" and expectedUnits is <constant>OPTUNITS_MHZ</constant>,

-      the value returned is <constant>10</constant>.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-      <programlisting>

-    Bool xf86GetOptValBool(const OptionInfoRec *table, int token, Bool *value);

-      </programlisting>

-	<blockquote><para>

-      This function is used to check boolean options

-      (<constant>OPTV_BOOLEAN</constant>).  If the function return value is

-      <constant>FALSE</constant>, it means the option wasn't set.  Otherwise

-      <parameter>*value</parameter> is set to the boolean value indicated by

-      the option's value.  No option <parameter>value</parameter> is interpreted

-      as <constant>TRUE</constant>.  Option values meaning <constant>TRUE</constant>

-      are "1", "yes", "on", "true", and option values meaning

-      <constant>FALSE</constant> are "0", "no", "off", "false".  Option names

-      both with the "no" prefix in their names, and with that prefix

-      removed are also checked and handled in the obvious way.

-      <parameter>*value</parameter> is not changed when the option isn't present.

-      It should normally be set to a default value before calling this

-      function.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    Bool xf86ReturnOptValBool(const OptionInfoRec *table, int token, Bool def);

-	</programlisting>

-	<blockquote><para>

-      This function is used to check boolean options

-      (<constant>OPTV_BOOLEAN</constant>).  If the option is set, its value

-      is returned.  If the options is not set, the default value specified

-      by <parameter>def</parameter> is returned.  The option interpretation is

-      the same as for <function>xf86GetOptValBool()</function>.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-    <blockquote><para>

-	<programlisting>

-    int xf86NameCmp(const char *s1, const char *s2);

-	</programlisting>

-	<blockquote><para>

-      This function should be used when comparing strings from the config

-      file with expected values.  It works like <function>strcmp()</function>,

-      but is not case sensitive and space, tab, and <quote><literal>_</literal></quote> characters

-      are ignored in the comparison.  The use of this function isn't

-      restricted to parsing option values.  It may be used anywhere

-      where this functionality required.

-	  </para>

-

-	</blockquote></para></blockquote>

-  </sect1>

-

-  <sect1>

-    <title>Modules, Drivers, Include Files and Interface Issues</title>

-

-    <para>

-NOTE: this section is incomplete.

-    </para>

-

-

-    <sect2>

-      <title>Include files</title>

-

-      <para>

-The following include files are typically required by video drivers:

-

-	<blockquote><para>

-  All drivers should include these:

-	    <literallayout><filename>

-    "xf86.h"

-    "xf86_OSproc.h"

-    "xf86_ansic.h"

-    "xf86Resources.h"

-	    </filename></literallayout>

-  Wherever inb/outb (and related things) are used the following should be

-  included:

-	    <literallayout><filename>

-    "compiler.h"

-	      </filename></literallayout>

-  Note: in drivers, this must be included after <filename>"xf86_ansic.h"</filename>.

-	  </para>

-

-	  <para>

-  Drivers that need to access PCI vendor/device definitions need this:

-	    <literallayout><filename>

-    "xf86PciInfo.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  Drivers that need to access the PCI config space need this:

-	    <literallayout><filename>

-    "xf86Pci.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  Drivers that initialise a SW cursor need this:

-	    <literallayout><filename>

-    "mipointer.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  All drivers implementing backing store need this:

-	    <literallayout><filename>

-    "mibstore.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  All drivers using the mi colourmap code need this:

-	    <literallayout><filename>

-    "micmap.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  If a driver uses the vgahw module, it needs this:

-	    <literallayout><filename>

-    "vgaHW.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  Drivers supporting VGA or Hercules monochrome screens need:

-	    <literallayout><filename>

-    "xf1bpp.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  Drivers supporting VGA or EGC 16-colour screens need:

-	    <literallayout><filename>

-    "xf4bpp.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  Drivers using cfb need:

-	    <programlisting>

-    #define PSZ 8

-    #include "cfb.h"

-    #undef PSZ

-	    </programlisting>

-	  </para>

-

-	  <para>

-  Drivers supporting bpp 16, 24 or 32 with cfb need one or more of:

-	    <literallayout><filename>

-    "cfb16.h"

-    "cfb24.h"

-    "cfb32.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  If a driver uses XAA, it needs these:

-	    <literallayout><filename>

-    "xaa.h"

-    "xaalocal.h"

-	      </filename></literallayout>

-	  </para>

-

-	  <para>

-  If a driver uses the fb manager, it needs this:

-	    <literallayout><filename>

-    "xf86fbman.h"

-	      </filename></literallayout>

-	  </para>

-	</blockquote>

-      </para>

-

-      <para>

-Non-driver modules should include <filename>"xf86_ansic.h"</filename> to get the correct

-wrapping of ANSI C/libc functions.

-      </para>

-

-      <para>

-All modules must NOT include any system include files, or the following:

-

-	<literallayout><filename>

-    "xf86Priv.h"

-    "xf86Privstr.h"

-    "xf86_OSlib.h"

-    "Xos.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-In addition, "xf86_libc.h" must not be included explicitly.  It is

-included implicitly by "xf86_ansic.h".

-      </para>

-

-    </sect2>

-  </sect1>

-

-  <sect1>

-    <title>Offscreen Memory Manager</title>

-

-    <para>

-Management of offscreen video memory may be handled by the XFree86

-framebuffer manager.  Once the offscreen memory manager is running,

-drivers or extensions may allocate, free or resize areas of offscreen

-video memory using the following functions (definitions taken from

-<filename>xf86fbman.h</filename>):

-

-      <programlisting>

-    typedef struct _FBArea {

-        ScreenPtr    pScreen;

-        BoxRec       box;

-        int          granularity;

-        void         (*MoveAreaCallback)(struct _FBArea*, struct _FBArea*)

-        void         (*RemoveAreaCallback)(struct _FBArea*)

-        DevUnion     devPrivate;

-    } FBArea, *FBAreaPtr;

-

-    typedef void (*MoveAreaCallbackProcPtr)(FBAreaPtr from, FBAreaPtr to)

-    typedef void (*RemoveAreaCallbackProcPtr)(FBAreaPtr)

-

-    FBAreaPtr xf86AllocateOffscreenArea (

-        ScreenPtr pScreen,

-        int width, int height,

-        int granularity,

-        MoveAreaCallbackProcPtr MoveAreaCallback,

-        RemoveAreaCallbackProcPtr RemoveAreaCallback,

-        pointer privData

-    )

-

-    void xf86FreeOffscreenArea (FBAreaPtr area)

-

-    Bool xf86ResizeOffscreenArea (

-	FBAreaPtr area

-	int w, int h

-    )

-      </programlisting>

-    </para>

-

-    <para>

-The function:

-      <programlisting>

-    Bool xf86FBManagerRunning(ScreenPtr pScreen);

-      </programlisting>

-

-can be used by an extension to check if the driver has initialized

-the memory manager.  The manager is not available if this returns

-<constant>FALSE</constant> and the functions above will all fail.

-    </para>

-

-

-    <para>

-<function>xf86AllocateOffscreenArea()</function> can be used to request a

-rectangle of dimensions <parameter>width</parameter>&nbsp;&times;&nbsp;<parameter>height</parameter>

-(in pixels) from unused offscreen memory.  <parameter>granularity</parameter>

-specifies that the leftmost edge of the rectangle must lie on some

-multiple of <parameter>granularity</parameter> pixels.  A granularity of zero

-means the same thing as a granularity of one - no alignment preference.

-A <parameter>MoveAreaCallback</parameter> can be provided to notify the requester

-when the offscreen area is moved.  If no <parameter>MoveAreaCallback</parameter>

-is supplied then the area is considered to be immovable.  The

-<parameter>privData</parameter> field will be stored in the manager's internal

-structure for that allocated area and will be returned to the requester

-in the <parameter>FBArea</parameter> passed via the

-<parameter>MoveAreaCallback</parameter>.  An optional

-<parameter>RemoveAreaCallback</parameter> is provided.  If the driver provides

-this it indicates that the area should be allocated with a lower priority.

-Such an area may be removed when a higher priority request (one that

-doesn't have a <parameter>RemoveAreaCallback</parameter>) is made.  When this

-function is called, the driver will have an opportunity to do whatever

-cleanup it needs to do to deal with the loss of the area, but it must

-finish its cleanup before the function exits since the offscreen memory

-manager will free the area immediately after.

-    </para>

-

-    <para>

-<function>xf86AllocateOffscreenArea()</function> returns <constant>NULL</constant>

-if it was unable to allocate the requested area.  When no longer needed,

-areas should be freed with <function>xf86FreeOffscreenArea()</function>.

-    </para>

-

-    <para>

-<function>xf86ResizeOffscreenArea()</function> resizes an existing

-<literal remap="tt">FBArea</literal>.  <function>xf86ResizeOffscreenArea()</function>

-returns <constant>TRUE</constant> if the resize was successful.  If

-<function>xf86ResizeOffscreenArea()</function> returns <constant>FALSE</constant>,

-the original <literal remap="tt">FBArea</literal> is left unmodified.  Resizing an

-area maintains the area's original <literal remap="tt">granularity</literal>,

-<literal remap="tt">devPrivate</literal>, and <literal remap="tt">MoveAreaCallback</literal>.

-<function>xf86ResizeOffscreenArea()</function> has considerably less overhead

-than freeing the old area then reallocating the new size, so it should

-be used whenever possible.

-    </para>

-

-    <para>

-The function:

-      <programlisting>

-    Bool xf86QueryLargestOffscreenArea(

-      ScreenPtr pScreen,

-      int *width, int *height,

-      int granularity,

-      int preferences,

-      int priority

-    );

-	</programlisting>

-

-is provided to query the width and height of the largest single

-<structname>FBArea</structname> allocatable given a particular priority.

-<parameter>preferences</parameter> can be one of the following to indicate

-whether width, height or area should be considered when determining

-which is the largest single <structname>FBArea</structname> available.

-

-      <programlisting>

-  FAVOR_AREA_THEN_WIDTH

-  FAVOR_AREA_THEN_HEIGHT

-  FAVOR_WIDTH_THEN_AREA

-  FAVOR_HEIGHT_THEN_AREA

-      </programlisting>

-    </para>

-

-    <para>

-<parameter>priority</parameter> is one of the following:

-

-      <blockquote>

-	<para>

-  <constant>PRIORITY_LOW</constant>

-	  <blockquote><para>

-     Return the largest block available without stealing anyone else's

-     space.  This corresponds to the priority of allocating a

-     <structname>FBArea</structname> when a <function>RemoveAreaCallback</function>

-     is provided.

-	    </para></blockquote>

-	</para>

-

-	<para>

-   <constant>PRIORITY_NORMAL</constant>

-	  <blockquote><para>

-     Return the largest block available if it is acceptable to steal a

-     lower priority area from someone.  This corresponds to the priority

-     of allocating a <structname>FBArea</structname> without providing a

-     <function>RemoveAreaCallback</function>.

-	    </para></blockquote>

-	</para>

-

-	<para>

-    <constant>PRIORITY_EXTREME</constant>

-	  <blockquote><para>

-     Return the largest block available if all <structname>FBArea</structname>s

-     that aren't locked down were expunged from memory first.  This

-     corresponds to any allocation made directly after a call to

-     <function>xf86PurgeUnlockedOffscreenAreas()</function>.

-	    </para></blockquote>

-	</para>

-

-      </blockquote>

-    </para>

-

-

-    <para>

-The function:

-

-      <programlisting>

-    Bool xf86PurgeUnlockedOffscreenAreas(ScreenPtr pScreen);

-      </programlisting>

-

-is provided as an extreme method to free up offscreen memory.  This

-will remove all removable <structname>FBArea</structname> allocations.

-    </para>

-

-

-    <para>

-Initialization of the XFree86 framebuffer manager is done via

-

-      <programlisting>

-    Bool xf86InitFBManager(ScreenPtr pScreen, BoxPtr FullBox);

-      </programlisting>

-

-<parameter>FullBox</parameter> represents the area of the framebuffer that the

-manager is allowed to manage.  This is typically a box with a width of

-<structfield>pScrn-&gt;displayWidth</structfield> and a height of as many lines as

-can be fit within the total video memory, however, the driver can reserve

-areas at the extremities by passing a smaller area to the manager.

-    </para>

-

-    <para>

-<function>xf86InitFBManager()</function> must be called before XAA is

-initialized since XAA uses the manager for it's pixmap cache.

-    </para>

-

-    <para>

-An alternative function is provided to allow the driver to initialize

-the framebuffer manager with a Region rather than a box.

-

-    <programlisting>

-    Bool xf86InitFBManagerRegion(ScreenPtr pScreen,

-                                 RegionPtr FullRegion);

-    </programlisting>

-

-<function>xf86InitFBManagerRegion()</function>, unlike

-<function>xf86InitFBManager()</function>, does not remove the area used for

-the visible screen so that area should not be included in the region

-passed to the function.  <function>xf86InitFBManagerRegion()</function> is

-useful when non-contiguous areas are available to be managed, and is

-required when multiple framebuffers are stored in video memory (as in

-the case where an overlay of a different depth is stored as a second

-framebuffer in offscreen memory).

-    </para>

-

-  </sect1>

-

-  <sect1 id="cmap">

-    <title>Colormap Handling</title>

-

-    <para>

-A generic colormap handling layer is provided within the XFree86 common

-layer.  This layer takes care of most of the details, and only requires

-a function from the driver that loads the hardware palette when required.

-To use the colormap layer, a driver calls the

-<function>xf86HandleColormaps()</function> function.

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86HandleColormaps(ScreenPtr pScreen, int maxColors,

-                             int sigRGBbits, LoadPaletteFuncPtr loadPalette,

-                             SetOverscanFuncPtr setOverscan,

-                             unsigned int flags);

-	  </programlisting>

-	  <blockquote><para>

-      This function must be called after the default colormap has been

-      initialised.  The <structfield>pScrn-&gt;gamma</structfield> field must also

-      be initialised, preferably by calling <function>xf86SetGamma()</function>.

-      <parameter>maxColors</parameter> is the number of entries in the palette.

-      <parameter>sigRGBbits</parameter> is the size in bits of each color

-      component in the DAC's palette.  <parameter>loadPalette</parameter>

-      is a driver-provided function for loading a colormap into the

-      hardware, and is described below.  <parameter>setOverscan</parameter> is

-      an optional function that may be provided when the overscan color

-      is an index from the standard LUT and when it needs to be adjusted

-      to keep it as close to black as possible.  The

-      <parameter>setOverscan</parameter> function programs the overscan index.

-      It shouldn't normally be used for depths other than 8.

-      <parameter>setOverscan</parameter> should be set to <constant>NULL</constant>

-      when it isn't needed.  <parameter>flags</parameter> may be set to the

-      following (which may be ORed together):

-

-	      <variablelist>

-		<varlistentry>

-		  <term><constant>CMAP_PALETTED_TRUECOLOR</constant></term>

-		  <listitem><para>

-				    the TrueColor visual is paletted and is

-				    just a special case of DirectColor.

-				    This flag is only valid for

-				    <code>bpp&nbsp;&gt;&nbsp;8</code>.

-

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>CMAP_RELOAD_ON_MODE_SWITCH</constant></term>

-		  <listitem><para>

-				    reload the colormap automatically

-                                    after mode switches.  This is useful

-                                    for when the driver is resetting the

-                                    hardware during mode switches and

-                                    corrupting or erasing the hardware

-                                    palette.

-

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>CMAP_LOAD_EVEN_IF_OFFSCREEN</constant></term>

-		  <listitem><para>

-				    reload the colormap even if the screen

-				    is switched out of the server's VC.

-				    The palette is <emphasis>not</emphasis> reloaded when

-				    the screen is switched back in, nor after

-				    mode switches.  This is useful when the

-				    driver needs to keep track of palette

-				    changes.

-

-		    </para></listitem></varlistentry>

-	      </variablelist>

-	    </para>

-

-	    <para>

-      The colormap layer normally reloads the palette after VT enters so it

-      is not necessary for the driver to save and restore the palette

-      when switching VTs.  The driver must, however, still save the

-      initial palette during server start up and restore it during

-      server exit.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoadPalette(ScrnInfoPtr pScrn, int numColors, int *indices,

-                     LOCO *colors, VisualPtr pVisual);

-	  </programlisting>

-	  <blockquote><para>

-      <function>LoadPalette()</function> is a driver-provided function for

-      loading a colormap into hardware.  <parameter>colors</parameter> is the

-      array of RGB values that represent the full colormap.

-      <parameter>indices</parameter> is a list of index values into the colors

-      array.  These indices indicate the entries that need to be updated.

-      <parameter>numColors</parameter> is the number of the indices to be

-      updated.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void SetOverscan(ScrnInfoPtr pScrn, int overscan);

-	  </programlisting>

-	  <blockquote><para>

-      <function>SetOverscan()</function> is a driver-provided function for

-      programming the <parameter>overscan</parameter> index.  As described

-      above, it is normally only appropriate for LUT modes where all

-      colormap entries are available for the display, but where one of

-      them is also used for the overscan (typically 8bpp for VGA compatible

-      LUTs).  It isn't required in cases where the overscan area is

-      never visible.

-	    </para>

-

-	  </blockquote></para>

-      </blockquote></para>

-

-  </sect1>

-

-  <sect1>

-    <title>DPMS Extension</title>

-

-    <para>

-Support code for the DPMS extension is included in the XFree86 common layer.

-This code provides an interface between the main extension code, and a means

-for drivers to initialise DPMS when they support it.  One function is

-available to drivers to do this initialisation, and it is always available,

-even when the DPMS extension is not supported by the core server (in

-which case it returns a failure result).

-    </para>

-

-    <blockquote><para>

-	<programlisting>

-    Bool xf86DPMSInit(ScreenPtr pScreen, DPMSSetProcPtr set, int flags);

-	</programlisting>

-	<blockquote><para>

-      This function registers a driver's DPMS level programming function

-      <parameter>set</parameter>.  It also checks

-      <structfield>pScrn-&gt;options</structfield> for the "dpms" option, and when

-      present marks DPMS as being enabled for that screen.  The

-      <parameter>set</parameter> function is called whenever the DPMS level

-      changes, and is used to program the requested level.

-      <parameter>flags</parameter> is currently not used, and should be

-      <constant>0</constant>.  If the initialisation fails for any reason,

-      including when there is no DPMS support in the core server, the

-      function returns <constant>FALSE</constant>.

-	  </para>

-

-	</blockquote></para></blockquote>

-

-

-    <para>

-Drivers that implement DPMS support must provide the following function,

-that gets called when the DPMS level is changed:

-

-

-      <blockquote><para>

-	  <programlisting>

-    void ChipDPMSSet(ScrnInfoPtr pScrn, int level, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      Program the DPMS level specified by <parameter>level</parameter>.  Valid

-      values of <parameter>level</parameter> are <constant>DPMSModeOn</constant>,

-      <constant>DPMSModeStandby</constant>, <constant>DPMSModeSuspend</constant>,

-      <constant>DPMSModeOff</constant>.  These values are defined in

-      <filename>"extensions/dpms.h"</filename>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </para>

-

-  </sect1>

-

-  <sect1>

-    <title>DGA Extension</title>

-

-    <para>

-Drivers can support the XFree86 Direct Graphics Architecture (DGA) by

-filling out a structure of function pointers and a list of modes and

-passing them to DGAInit.

-    </para>

-

-    <blockquote><para>

-	<programlisting>

-    Bool DGAInit(ScreenPtr pScreen, DGAFunctionPtr funcs,

-                 DGAModePtr modes, int num);

-

-/** The DGAModeRec **/

-

-typedef struct {

-  int num;

-  DisplayModePtr mode;

-  int flags;

-  int imageWidth;

-  int imageHeight;

-  int pixmapWidth;

-  int pixmapHeight;

-  int bytesPerScanline;

-  int byteOrder;

-  int depth;

-  int bitsPerPixel;

-  unsigned long red_mask;

-  unsigned long green_mask;

-  unsigned long blue_mask;

-  int viewportWidth;

-  int viewportHeight;

-  int xViewportStep;

-  int yViewportStep;

-  int maxViewportX;

-  int maxViewportY;

-  int viewportFlags;

-  int offset;

-  unsigned char *address;

-  int reserved1;

-  int reserved2;

-} DGAModeRec, *DGAModePtr;

-	</programlisting>

-

-	<variablelist>

-	  <varlistentry>

-	    <term><structfield>num</structfield></term>

-	    <listitem><para>

-	 Can be ignored.  The DGA DDX will assign these numbers.

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>mode</structfield></term>

-	    <listitem><para>

-	A pointer to the <structname>DisplayModeRec</structname> for this mode.

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>flags</structfield></term>

-	      <listitem><para>

-	The following flags are defined and may be OR'd together:

-

-		  <variablelist>

-		    <varlistentry>

-		      <term><constant>DGA_CONCURRENT_ACCESS</constant></term>

-		      <listitem><para>

-            Indicates that the driver supports concurrent graphics

-            accelerator and linear framebuffer access.

-

-			</para></listitem></varlistentry>

-

-		    <varlistentry>

-		      <term><constant>DGA_FILL_RECT

-			  DGA_BLIT_RECT

-			  DGA_BLIT_RECT_TRANS</constant></term>

-		      <listitem><para>

-	    Indicates that the driver supports the FillRect, BlitRect

-            or BlitTransRect functions in this mode.

-

-			</para></listitem></varlistentry>

-

-		    <varlistentry>

-		      <term><constant>DGA_PIXMAP_AVAILABLE</constant></term>

-		      <listitem><para>

-	    Indicates that Xlib may be used on the framebuffer.

-            This flag will usually be set unless the driver wishes

-            to prohibit this for some reason.

-

-			</para></listitem></varlistentry>

-

-		    <varlistentry>

-		      <term><constant>DGA_INTERLACED

-			  DGA_DOUBLESCAN</constant></term>

-		      <listitem><para>

-            Indicates that these are interlaced or double scan modes.

-

-			</para></listitem></varlistentry>

-		  </variablelist>

-		</para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>imageWidth

-		imageHeight</structfield></term>

-	    <listitem><para>

-		    These are the dimensions of the linear framebuffer

-                     accessible by the client.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>pixmapWidth

-		pixmapHeight</structfield></term>

-	    <listitem><para>

-		     These are the dimensions of the area of the

-                     framebuffer accessible by the graphics accelerator.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>bytesPerScanline</structfield></term>

-	    <listitem><para>

-		      Pitch of the framebuffer in bytes.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>byteOrder</structfield></term>

-	    <listitem><para>

-		     Usually the same as

-		     <structfield>pScrn-&gt;imageByteOrder</structfield>.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>depth</structfield></term>

-	    <listitem><para>

-		     The depth of the framebuffer in this mode.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>bitsPerPixel</structfield></term>

-	    <listitem><para>

-		      The number of bits per pixel in this mode.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>red_mask</structfield></term>

-	    <term><structfield>green_mask</structfield></term>

-	    <term><structfield>blue_mask</structfield></term>

-	    <listitem><para>

-		      The RGB masks for this mode, if applicable.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>viewportWidth</structfield></term>

-	    <term><structfield>viewportHeight</structfield></term>

-	    <listitem><para>

-		      Dimensions of the visible part of the framebuffer.

-		      Usually <structfield>mode-&gt;HDisplay</structfield> and

-		      <structfield>mode-&gt;VDisplay</structfield>.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>xViewportStep

-		yViewportStep</structfield></term>

-	    <listitem><para>

-		     The granularity of x and y viewport positions that

-                     the driver supports in this mode.

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>maxViewportX

-		maxViewportY</structfield></term>

-	    <listitem><para>

-		      The maximum viewport position supported by the

-                       driver in this mode.

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>viewportFlags</structfield></term>

-	    <listitem><para>

-		     The following may be OR'd together:

-

-		<variablelist>

-		  <varlistentry>

-		    <term><constant>DGA_FLIP_IMMEDIATE</constant></term>

-		    <listitem><para>

-		The driver supports immediate viewport changes.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><constant>DGA_FLIP_RETRACE</constant></term>

-

-		    <listitem><para>

-		The driver supports viewport changes at retrace.

-		      </para></listitem></varlistentry>

-		  </variablelist>

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>offset</structfield></term>

-	    <listitem><para>

-	        The offset into the linear framebuffer that corresponds to

-                pixel (0,0) for this mode.

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>address</structfield></term>

-	    <listitem><para>

-                The virtual address of the framebuffer as mapped by the driver.

-                This is needed when DGA_PIXMAP_AVAILABLE is set.

-	      </para></listitem></varlistentry>

-

-	</variablelist>

-

-	<programlisting>

-/** The DGAFunctionRec **/

-

-typedef struct {

-  Bool (*OpenFramebuffer)(

-       ScrnInfoPtr pScrn,

-       char **name,

-       unsigned char **mem,

-       int *size,

-       int *offset,

-       int *extra

-  );

-  void (*CloseFramebuffer)(ScrnInfoPtr pScrn);

-  Bool (*SetMode)(ScrnInfoPtr pScrn, DGAModePtr pMode);

-  void (*SetViewport)(ScrnInfoPtr pScrn, int x, int y, int flags);

-  int  (*GetViewport)(ScrnInfoPtr pScrn);

-  void (*Sync)(ScrnInfoPtr);

-  void (*FillRect)(

-       ScrnInfoPtr pScrn,

-       int x, int y, int w, int h,

-       unsigned long color

-  );

-  void (*BlitRect)(

-       ScrnInfoPtr pScrn,

-       int srcx, int srcy,

-       int w, int h,

-       int dstx, int dsty

-  );

-  void (*BlitTransRect)(

-       ScrnInfoPtr pScrn,

-       int srcx, int srcy,

-       int w, int h,

-       int dstx, int dsty,

-       unsigned long color

-  );

-} DGAFunctionRec, *DGAFunctionPtr;

-	</programlisting>

-

-

-	<blockquote><para>

-	    <programlisting>

-    Bool OpenFramebuffer (pScrn, name, mem, size, offset, extra);

-	    </programlisting>

-	    <blockquote><para>

-      <function>OpenFramebuffer()</function> should pass the client everything

-      it needs to know to be able to open the framebuffer.  These

-      parameters are OS specific and their meanings are to be interpreted

-      by an OS specific client library.

-

-		<variablelist>

-		  <varlistentry>

-		    <term><parameter>name</parameter></term>

-		    <listitem><para>

-	      The name of the device to open or <constant>NULL</constant> if

-	      there is no special device to open.  A <constant>NULL</constant>

-	      name tells the client that it should open whatever device

-	      one would usually open to access physical memory.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><parameter>mem</parameter></term>

-		    <listitem><para>

-	      The physical address of the start of the framebuffer.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><parameter>size</parameter></term>

-		    <listitem><para>

-	      The size of the framebuffer in bytes.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><parameter>offset</parameter></term>

-		    <listitem><para>

-	      Any offset into the device, if applicable.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><parameter>flags</parameter></term>

-		    <listitem><para>

-	      Any additional information that the client may need.

-	      Currently, only the <constant>DGA_NEED_ROOT</constant> flag is

-	      defined.

-		      </para></listitem></varlistentry>

-

-		</variablelist>

-	      </para></blockquote>

-	  </para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    void CloseFramebuffer (pScrn);

-	    </programlisting>

-	    <blockquote><para>

-      <function>CloseFramebuffer()</function> merely informs the driver (if it

-      even cares) that client no longer needs to access the framebuffer

-      directly.  This function is optional.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    Bool SetMode (pScrn, pMode);

-	    </programlisting>

-	    <blockquote><para>

-      <function>SetMode()</function> tells the driver to initialize the mode

-      passed to it.  If <parameter>pMode</parameter> is <constant>NULL</constant>,

-      then the driver should restore the original pre-DGA mode.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    void SetViewport (pScrn, x, y, flags);

-	    </programlisting>

-	    <blockquote><para>

-      <function>SetViewport()</function> tells the driver to make the upper

-      left-hand corner of the visible screen correspond to coordinate

-      <literal remap="tt">(x,y)</literal> on the framebuffer.  <parameter>flags</parameter>

-      currently defined are:

-

-		<variablelist>

-		  <varlistentry>

-		    <term><constant>DGA_FLIP_IMMEDIATE</constant></term>

-		    <listitem><para>

-	    The viewport change should occur immediately.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><constant>DGA_FLIP_RETRACE</constant></term>

-		    <listitem><para>

-	    The viewport change should occur at the

-            vertical retrace, but this function should

-            return sooner if possible.

-			</para></listitem></varlistentry>

-		</variablelist>

-	      </para>

-

-	      <para>

-      The <literal remap="tt">(x,y)</literal> locations will be passed as the client

-      specified them, however, the driver is expected to round these

-      locations down to the next supported location as specified by the

-      <structfield>xViewportStep</structfield> and <structfield>yViewportStep</structfield>

-      for the current mode.

-	      </para>

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    int GetViewport (pScrn);

-	    </programlisting>

-	    <blockquote><para>

-      <function>GetViewport()</function> gets the current page flip status.

-      Set bits in the returned int correspond to viewport change requests

-      still pending.  For instance, set bit zero if the last SetViewport

-      request is still pending, bit one if the one before that is still

-      pending, etc.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    void Sync (pScrn);

-	    </programlisting>

-	    <blockquote><para>

-      This function should ensure that any graphics accelerator operations

-      have finished.  This function should not return until the graphics

-      accelerator is idle.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    void FillRect (pScrn, x, y, w, h, color);

-	    </programlisting>

-	    <blockquote><para>

-      This optional function should fill a rectangle

-      <parameter>w&nbsp;&times;&nbsp;h</parameter> located at

-      <parameter>(x,y)</parameter> in the given color.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    void BlitRect (pScrn, srcx, srcy, w, h, dstx, dsty);

-	    </programlisting>

-	    <blockquote><para>

-      This optional function should copy an area

-      <parameter>w&nbsp;&times;&nbsp;h</parameter> located at

-      <parameter>(srcx,srcy)</parameter> to location <parameter>(dstx,dsty)</parameter>.

-      This function will need to handle copy directions as appropriate.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    void BlitTransRect (pScrn, srcx, srcy, w, h, dstx, dsty, color);

-	    </programlisting>

-	    <blockquote><para>

-      This optional function is the same as BlitRect except that pixels

-      in the source corresponding to the color key <parameter>color</parameter>

-      should be skipped.

-	      </para>

-

-	    </blockquote></para></blockquote>

-    </para></blockquote>

-

-  </sect1>

-

-  <sect1>

-    <title>The XFree86 X Video Extension (Xv) Device Dependent Layer</title>

-

-    <para>

-XFree86 offers the X Video Extension which allows clients to treat video

-as any another primitive and <quote>Put</quote> video into drawables.  By default,

-the extension reports no video adaptors as being available since the

-DDX layer has not been initialized.  The driver can initialize the DDX

-layer by filling out one or more <literal remap="tt">XF86VideoAdaptorRecs</literal>

-as described later in this document and passing a list of

-<literal remap="tt">XF86VideoAdaptorPtr</literal> pointers to the following function:

-

-      <programlisting>

-    Bool xf86XVScreenInit(ScreenPtr pScreen,

-                          XF86VideoAdaptorPtr *adaptPtrs,

-                          int num);

-      </programlisting>

-    </para>

-

-    <para>

-After doing this, the extension will report video adaptors as being

-available, providing the data in their respective

-<literal remap="tt">XF86VideoAdaptorRecs</literal> was valid.

-<function>xf86XVScreenInit()</function> <emphasis>copies</emphasis> data from the structure

-passed to it so the driver may free it after the initialization.  At

-the moment, the DDX only supports rendering into Window drawables.

-Pixmap rendering will be supported after a sufficient survey of suitable

-hardware is completed.

-    </para>

-

-    <para>

-The <structname>XF86VideoAdaptorRec</structname>:

-

-      <programlisting>

-typedef struct {

-	unsigned int type;

-	int flags;

-	char *name;

-	int nEncodings;

-	XF86VideoEncodingPtr pEncodings;

-	int nFormats;

-	XF86VideoFormatPtr pFormats;

-	int nPorts;

-	DevUnion *pPortPrivates;

-	int nAttributes;

-	XF86AttributePtr pAttributes;

-	int nImages;

-	XF86ImagePtr pImages;

-	PutVideoFuncPtr PutVideo;

-	PutStillFuncPtr PutStill;

-	GetVideoFuncPtr GetVideo;

-	GetStillFuncPtr GetStill;

-	StopVideoFuncPtr StopVideo;

-	SetPortAttributeFuncPtr SetPortAttribute;

-	GetPortAttributeFuncPtr GetPortAttribute;

-	QueryBestSizeFuncPtr QueryBestSize;

-	PutImageFuncPtr PutImage;

-	QueryImageAttributesFuncPtr QueryImageAttributes;

-} XF86VideoAdaptorRec, *XF86VideoAdaptorPtr;

-      </programlisting></para>

-

-    <para>

-Each adaptor will have its own XF86VideoAdaptorRec.  The fields are

-as follows:

-

-      <variablelist>

-	<varlistentry>

-	  <term><structfield>type</structfield></term>

-	  <listitem><para>

-	This can be any of the following flags OR'd together.

-

-	      <variablelist>

-		<varlistentry>

-		  <term><constant>XvInputMask</constant>

-		    <constant>XvOutputMask</constant></term>

-		  <listitem><para>

-	    These refer to the target drawable and are similar to a Window's

-	    class. <literal remap="tt">XvInputMask</literal> indicates that the adaptor

-	    can put video into a drawable.  <literal remap="tt">XvOutputMask</literal>

-	    indicates that the adaptor can get video from a drawable.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><constant>XvVideoMask</constant>

-		    <constant>XvStillMask</constant>

-		    <constant>XvImageMask</constant></term>

-		  <listitem><para>

-	    These indicate that the adaptor supports video, still or

-	    image primitives respectively.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><constant>XvWindowMask</constant>

-		    <constant>XvPixmapMask</constant></term>

-		  <listitem><para>

-	    These indicate the types of drawables the adaptor is capable

-	    of rendering into.  At the moment, Pixmap rendering is not

-	    supported and the <constant>XvPixmapMask</constant> flag is ignored.

-		    </para></listitem></varlistentry>

-	      </variablelist>

-

-	    </para></listitem></varlistentry>

-

-	<varlistentry>

-	  <term><structfield>flags</structfield></term>

-	  <listitem><para>

-	Currently, the following flags are defined:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><constant>VIDEO_NO_CLIPPING</constant></term>

-		  <listitem><para>

-	   This indicates that the video adaptor does not support

-	   clipping.  The driver will never receive <quote>Put</quote> requests

-	   where less than the entire area determined by

-	   <parameter>drw_x</parameter>, <parameter>drw_y</parameter>,

-	   <parameter>drw_w</parameter> and <parameter>drw_h</parameter> is visible.

-	   This flag does not apply to <quote>Get</quote> requests.  Hardware

-	   that is incapable of clipping <quote>Gets</quote> may punt or get

-	   the extents of the clipping region passed to it.

-		    </para></listitem>

-

-		</varlistentry>

-

-		<varlistentry>

-		  <term><constant>VIDEO_INVERT_CLIPLIST</constant></term>

-		  <listitem><para>

-	   This indicates that the video driver requires the clip

-	   list to contain the regions which are obscured rather

-	   than the regions which are are visible.

-		    </para></listitem>

-

-		</varlistentry>

-

-		<varlistentry>

-		  <term><constant>VIDEO_OVERLAID_STILLS</constant></term>

-		  <listitem><para>

-	   Implementing PutStill for hardware that does video as an

-	   overlay can be awkward since it's unclear how long to leave

-	   the video up for.  When this flag is set, StopVideo will be

-	   called whenever the destination gets clipped or moved so that

-	   the still can be left up until then.

-		    </para></listitem>

-

-		</varlistentry>

-

-		<varlistentry>

-		  <term><constant>VIDEO_OVERLAID_IMAGES</constant></term>

-		  <listitem><para>

-	   Same as <constant>VIDEO_OVERLAID_STILLS</constant> but for images.

-		    </para></listitem>

-		</varlistentry>

-

-		<varlistentry>

-		  <term><constant>VIDEO_CLIP_TO_VIEWPORT</constant></term>

-		  <listitem><para>

-	    Indicates that the clip region passed to the driver functions

-	    should be clipped to the visible portion of the screen in the

-	    case where the viewport is smaller than the virtual desktop.

-		    </para></listitem></varlistentry>

-

-	      </variablelist>

-	    </para></listitem></varlistentry>

-

-	<varlistentry>

-	  <term><structfield>name</structfield></term>

-	  <listitem><para>

-	The name of the adaptor.

-	    </para></listitem></varlistentry>

-

-

-	<varlistentry>

-	  <term><structfield>nEncodings</structfield>

-	    <structfield>pEncodings</structfield></term>

-	  <listitem><para>

-	The number of encodings the adaptor is capable of and pointer

-	to the <structname>XF86VideoEncodingRec</structname> array.  The

-	<structname>XF86VideoEncodingRec</structname> is described later on.

-	For drivers that only support XvImages there should be an encoding

-	named "XV_IMAGE" and the width and height should specify

-	the maximum size source image supported.

-	  </para></listitem></varlistentry>

-

-

-	<varlistentry>

-	  <term><structfield>nFormats</structfield>

-	      <structfield>pFormats</structfield></term>

-	  <listitem><para>

-	The number of formats the adaptor is capable of and pointer to

-	the <structname>XF86VideoFormatRec</structname> array.  The

-	<structname>XF86VideoFormatRec</structname> is described later on.

-	    </para></listitem></varlistentry>

-

-

-	<varlistentry>

-	  <term><structfield>nPorts</structfield>

-	    <structfield>pPortPrivates</structfield></term>

-	  <listitem><para>

-	The number of ports is the number of separate data streams which

-	the adaptor can handle simultaneously.  If you have more than

-	one port, the adaptor is expected to be able to render into more

-	than one window at a time.  <structfield>pPortPrivates</structfield> is

-	an array of pointers or ints - one for each port.  A port's

-	private data will be passed to the driver any time the port is

-	requested to do something like put the video or stop the video.

-	In the case where there may be many ports, this enables the

-	driver to know which port the request is intended for.  Most

-	commonly, this will contain a pointer to the data structure

-	containing information about the port.  In Xv, all ports on

-	a particular adaptor are expected to be identical in their

-	functionality.

-	    </para></listitem></varlistentry>

-

-

-	<varlistentry>

-	  <term><structfield>nAttributes</structfield>

-	    <structfield>pAttributes</structfield></term>

-	  <listitem><para>

-	The number of attributes recognized by the adaptor and a pointer to

-	the array of <structname>XF86AttributeRecs</structname>.  The

-	<structname>XF86AttributeRec</structname> is described later on.

-	    </para></listitem></varlistentry>

-

-

-	<varlistentry>

-	  <term><structfield>nImages</structfield>

-	    <structfield>pImages</structfield></term>

-	  <listitem><para>

-	The number of <structname>XF86ImageRecs</structname> supported by the adaptor

-	and a pointer to the array of <structname>XF86ImageRecs</structname>. The

-	<structname>XF86ImageRec</structname> is described later on.

-	    </para></listitem></varlistentry>

-

-

-	<varlistentry>

-	  <term><structfield>

-     PutVideo PutStill GetVideo GetStill StopVideo

-     SetPortAttribute GetPortAttribute QueryBestSize PutImage

-     QueryImageAttributes

-	    </structfield></term>

-	  <listitem><para>

-	These functions define the DDX-&gt;driver interface.  In each

-	case, the pointer <parameter>data</parameter> is passed to the driver.

-	This is the port private for that port as described above.  All

-	fields are required except under the following conditions:

-

-	      <orderedlist>

-		<listitem><para>

-	     <structfield>PutVideo</structfield>, <structfield>PutStill</structfield> and

-	     the image routines <structfield>PutImage</structfield> and

-	     <structfield>QueryImageAttributes</structfield> are not required when the

-	     adaptor type does not contain <constant>XvInputMask</constant>.

-		  </para></listitem>

-

-		<listitem><para>

-	     <structfield>GetVideo</structfield> and <structfield>GetStill</structfield>

-	     are not required when the adaptor type does not contain

-	     <constant>XvOutputMask</constant>.

-		  </para></listitem>

-

-		<listitem><para>

-	     <structfield>GetVideo</structfield> and <structfield>PutVideo</structfield>

-	     are not required when the adaptor type does not contain

-	     <constant>XvVideoMask</constant>.

-		  </para></listitem>

-

-		<listitem><para>

-	     <structfield>GetStill</structfield> and <structfield>PutStill</structfield>

-	     are not required when the adaptor type does not contain

-	     <constant>XvStillMask</constant>.

-		  </para></listitem>

-

-		<listitem><para>

-	     <structfield>PutImage</structfield> and <structfield>QueryImageAttributes</structfield>

-	     are not required when the adaptor type does not contain

-	     <constant>XvImageMask</constant>.

-		  </para></listitem>

-

-	      </orderedlist>

-

-	    </para>

-

-	    <para>

-	With the exception of <structfield>QueryImageAttributes</structfield>, these

-	functions should return <constant>Success</constant> if the operation was

-	completed successfully.  They can return <constant>XvBadAlloc</constant>

-	otherwise. <structfield>QueryImageAttributes</structfield> returns the size

-	of the XvImage queried.

-	    </para>

-

-	    <para>

-	If the <constant>VIDEO_NO_CLIPPING</constant>

-	flag is set, the <literal remap="tt">clipBoxes</literal> may be ignored by

-	the driver.  <literal remap="tt">ClipBoxes</literal> is an <literal remap="tt">X-Y</literal>

-	banded region identical to those used throughout the server.

-	The clipBoxes represent the visible portions of the area determined

-	by <literal remap="tt">drw_x</literal>, <literal remap="tt">drw_y</literal>,

-	<literal remap="tt">drw_w</literal> and <literal remap="tt">drw_h</literal> in the Get/Put

-	function.  The boxes are in screen coordinates, are guaranteed

-	not to overlap and an empty region will never be passed.

-	If the driver has specified <constant>VIDEO_INVERT_CLIPLIST</constant>,

-	<literal remap="tt">clipBoxes</literal> will indicate the areas of the primitive

-	which are obscured rather than the areas visible.

-

-	    </para></listitem></varlistentry>

-      </variablelist>

-

-      <blockquote><para>

-	  <programlisting>

-    typedef  int (* PutVideoFuncPtr)( ScrnInfoPtr pScrn,

-                   short vid_x, short vid_y, short drw_x, short drw_y,

-                   short vid_w, short vid_h, short drw_w, short drw_h,

-                   RegionPtr clipBoxes, pointer data );

-	  </programlisting>

-	      <blockquote><para>

-	  This indicates that the driver should take a subsection

-	  <parameter>vid_w</parameter> by <parameter>vid_h</parameter> at location

-	  <parameter>(vid_x,vid_y)</parameter> from the video stream and direct

-	  it into the rectangle <parameter>drw_w</parameter> by <parameter>drw_h</parameter>

-	  at location <parameter>(drw_x,drw_y)</parameter> on the screen, scaling as

-	  necessary.  Due to the large variations in capabilities of

-	  the various hardware expected to be used with this extension,

-	  it is not expected that all hardware will be able to do this

-	  exactly as described.  In that case the driver should just do

-	  <quote>the best it can,</quote> scaling as closely to the target rectangle

-	  as it can without rendering outside of it.  In the worst case,

-	  the driver can opt to just not turn on the video.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    typedef  int (* PutStillFuncPtr)( ScrnInfoPtr pScrn,

-                   short vid_x, short vid_y, short drw_x, short drw_y,

-                   short vid_w, short vid_h, short drw_w, short drw_h,

-                   RegionPtr clipBoxes, pointer data );

-	      </programlisting>

-	      <blockquote><para>

-	  This is same as <structfield>PutVideo</structfield> except that the driver

-	  should place only one frame from the stream on the screen.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    typedef int (* GetVideoFuncPtr)( ScrnInfoPtr pScrn,

-                  short vid_x, short vid_y, short drw_x, short drw_y,

-                  short vid_w, short vid_h, short drw_w, short drw_h,

-                  RegionPtr clipBoxes, pointer data );

-	      </programlisting>

-	      <blockquote><para>

-	  This is same as <structfield>PutVideo</structfield> except that the driver

-	  gets video from the screen and outputs it.  The driver should

-	  do the best it can to get the requested dimensions correct

-	  without reading from an area larger than requested.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    typedef int (* GetStillFuncPtr)( ScrnInfoPtr pScrn,

-                  short vid_x, short vid_y, short drw_x, short drw_y,

-                  short vid_w, short vid_h, short drw_w, short drw_h,

-                  RegionPtr clipBoxes, pointer data );

-	      </programlisting>

-	      <blockquote><para>

-	  This is the same as <literal remap="tt">GetVideo</literal> except that the

-	  driver should place only one frame from the screen into the

-	  output stream.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	      <programlisting>

-    typedef void (* StopVideoFuncPtr)(ScrnInfoPtr pScrn,

-                                      pointer data, Bool cleanup);

-	      </programlisting>

-	      <blockquote><para>

-	  This indicates the driver should stop displaying the video.

-	  This is used to stop both input and output video.  The

-	  <parameter>cleanup</parameter> field indicates that the video is

-	  being stopped because the client requested it to stop or

-	  because the server is exiting the current VT.  In that case

-	  the driver should deallocate any offscreen memory areas (if

-	  there are any) being used to put the video to the screen.  If

-	  <parameter>cleanup</parameter> is not set, the video is being stopped

-	  temporarily due to clipping or moving of the window, etc...

-	  and video will likely be restarted soon so the driver should

-	  not deallocate any offscreen areas associated with that port.

-	      </para>

-

-	    </blockquote></para></blockquote>

-	  <blockquote><para>

-	      <programlisting>

-    typedef int (* SetPortAttributeFuncPtr)(ScrnInfoPtr pScrn,

-                                Atom attribute,INT32 value, pointer data);

-	      </programlisting>

-

-	      <programlisting>

-    typedef int (* GetPortAttributeFuncPtr)(ScrnInfoPtr pScrn,

-                                Atom attribute,INT32 *value, pointer data);

-	      </programlisting>

-	      <blockquote><para>

-	  A port may have particular attributes such as hue,

-	  saturation, brightness or contrast.  Xv clients set and

-	  get these attribute values by sending attribute strings

-	  (Atoms) to the server.  Such requests end up at these

-	  driver functions.  It is recommended that the driver provide

-	  at least the following attributes mentioned in the Xv client

-	  library docs:

-		<literallayout><constant>

-		XV_ENCODING

-		XV_HUE

-		XV_SATURATION

-		XV_BRIGHTNESS

-  		XV_CONTRAST

-		  </constant></literallayout>

-	  but the driver may recognize as many atoms as it wishes.  If

-	  a requested attribute is unknown by the driver it should return

-	  <constant>BadMatch</constant>.  <constant>XV_ENCODING</constant> is the

-	  attribute intended to let the client specify which video

-	  encoding the particular port should be using (see the description

-	  of <structname>XF86VideoEncodingRec</structname> below).  If the

-	  requested encoding is unsupported, the driver should return

-	  <constant>XvBadEncoding</constant>.  If the value lies outside the

-	  advertised range <constant>BadValue</constant> may be returned.

-	  <constant>Success</constant> should be returned otherwise.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	  <blockquote><para>

-	    <programlisting>

-    typedef void (* QueryBestSizeFuncPtr)(ScrnInfoPtr pScrn,

-                   Bool motion, short vid_w, short vid_h,

-                   short drw_w, short drw_h,

-                   unsigned int *p_w, unsigned int *p_h, pointer data);

-	    </programlisting>

-	    <blockquote><para>

-	   <function>QueryBestSize</function> provides the client with a way

-	   to query what the destination dimensions would end up being

-	   if they were to request that an area

-	   <parameter>vid_w</parameter> by <parameter>vid_h</parameter> from the video

-	   stream be scaled to rectangle of

-	   <parameter>drw_w</parameter> by <parameter>drw_h</parameter> on the screen.

-	   Since it is not expected that all hardware will be able to

-	   get the target dimensions exactly, it is important that the

-	   driver provide this function.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    typedef  int (* PutImageFuncPtr)( ScrnInfoPtr pScrn,

-                   short src_x, short src_y, short drw_x, short drw_y,

-                   short src_w, short src_h, short drw_w, short drw_h,

-                   int image, char *buf, short width, short height,

-                   Bool sync, RegionPtr clipBoxes, pointer data );

-	      </programlisting>

-	      <blockquote><para>

-	  This is similar to <structfield>PutStill</structfield> except that the

-	  source of the video is not a port but the data stored in a system

-	  memory buffer at <parameter>buf</parameter>.  The data is in the format

-	  indicated by the <parameter>image</parameter> descriptor and represents a

-	  source of size <parameter>width</parameter> by <parameter>height</parameter>.

-	  If <parameter>sync</parameter> is TRUE the driver should not return

-	  from this function until it is through reading the data

-	  from <parameter>buf</parameter>.  Returning when <parameter>sync</parameter>

-	  is TRUE indicates that it is safe for the data at <parameter>buf</parameter>

-	  to be replaced, freed, or modified.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    typedef  int (* QueryImageAttributesFuncPtr)( ScrnInfoPtr pScrn,

-                                int image, short *width, short *height,

-                                int *pitches, int *offsets);

-	    </programlisting>

-	    <blockquote><para>

-	  This function is called to let the driver specify how data for

-	  a particular <parameter>image</parameter> of size <parameter>width</parameter>

-	  by <parameter>height</parameter> should be stored.  Sometimes only

-	  the size and corrected width and height are needed.  In that

-	  case <parameter>pitches</parameter> and <parameter>offsets</parameter> are

-	  NULL.  The size of the memory required for the image is returned

-	  by this function.  The <parameter>width</parameter> and

-	  <parameter>height</parameter> of the requested image can be altered by

-	  the driver to reflect format limitations (such as component

-	  sampling periods that are larger than one).  If

-	  <parameter>pitches</parameter> and <parameter>offsets</parameter> are not NULL,

-	  these will be arrays with as many elements in them as there

-	  are planes in the <parameter>image</parameter> format.  The driver

-	  should specify the pitch (in bytes) of each scanline in the

-	  particular plane as well as the offset to that plane (in bytes)

-	  from the beginning of the image.

-	      </para>

-

-	  </blockquote></para></blockquote>

-    </para>

-

-    <para>

-The XF86VideoEncodingRec:

-

-      <blockquote><para>

-	  <programlisting>

-typedef struct {

-	int id;

-	char *name;

-	unsigned short width, height;

-	XvRationalRec rate;

-} XF86VideoEncodingRec, *XF86VideoEncodingPtr;

-

-	  </programlisting>

-	  <blockquote><para>

-   The <structname>XF86VideoEncodingRec</structname> specifies what encodings

-   the adaptor can support.  Most of this data is just informational

-   and for the client's benefit, and is what will be reported by

-   <function>XvQueryEncodings</function>.  The <parameter>id</parameter> field is

-   expected to be a unique identifier to allow the client to request a

-   certain encoding via the <constant>XV_ENCODING</constant> attribute string.

-

-	    </para>

-	  </blockquote></para></blockquote>

-    </para>

-

-    <para>

-The XF86VideoFormatRec:

-

-      <blockquote><para>

-	  <programlisting>

-typedef struct {

-	char  depth;

-	short class;

-} XF86VideoFormatRec, *XF86VideoFormatPtr;

-

-	  </programlisting>

-	  <blockquote><para>

-    This specifies what visuals the video is viewable in.

-    <parameter>depth</parameter> is the depth of the visual (not bpp).

-    <parameter>class</parameter> is the visual class such as

-    <constant>TrueColor</constant>, <constant>DirectColor</constant> or

-    <constant>PseudoColor</constant>.  Initialization of an adaptor will fail

-    if none of the visuals on that screen are supported.

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </para>

-

-    <para>

-The XF86AttributeRec:

-

-      <blockquote><para>

-	  <programlisting>

-typedef struct {

-	int   flags;

-	int   min_value;

-	int   max_value;

-	char  *name;

-} XF86AttributeListRec, *XF86AttributeListPtr;

-

-	  </programlisting>

-	  <blockquote><para>

-   Each adaptor may have an array of these advertising the attributes

-   for its ports.  Currently defined flags are <literal remap="tt">XvGettable</literal>

-   and <literal remap="tt">XvSettable</literal> which may be OR'd together indicating that

-   attribute is <quote>gettable</quote> or <quote>settable</quote> by the client.  The

-   <literal remap="tt">min</literal> and <literal remap="tt">max</literal> field specify the valid range

-   for the value.  <literal remap="tt">Name</literal> is a text string describing the

-   attribute by name.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-    </para>

-

-    <para>

-The XF86ImageRec:

-

-	<blockquote><para>

-	    <programlisting>

-typedef struct {

-	int id;

-	int type;

-	int byte_order;

-	char guid[16];

-	int bits_per_pixel;

-	int format;

-	int num_planes;

-

-	/* for RGB formats */

-	int depth;

-	unsigned int red_mask;

-	unsigned int green_mask;

-	unsigned int blue_mask;

-

-	/* for YUV formats */

-	unsigned int y_sample_bits;

-	unsigned int u_sample_bits;

-	unsigned int v_sample_bits;

-	unsigned int horz_y_period;

-	unsigned int horz_u_period;

-	unsigned int horz_v_period;

-	unsigned int vert_y_period;

-	unsigned int vert_u_period;

-	unsigned int vert_v_period;

-	char component_order[32];

-	int scanline_order;

-} XF86ImageRec, *XF86ImagePtr;

-

-	    </programlisting>

-	    <blockquote><para>

-   XF86ImageRec describes how video source data is laid out in memory.

-   The fields are as follows:

-

-		<variablelist>

-		  <varlistentry>

-		    <term><structfield>id</structfield></term>

-		    <listitem><para>

-	This is a unique descriptor for the format.  It is often good to

-        set this value to the FOURCC for the format when applicable.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>type</structfield></term>

-		    <listitem><para>

-	This is <constant>XvRGB</constant> or <constant>XvYUV</constant>.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>byte_order</structfield></term>

-		    <listitem><para>

-	This is <constant>LSBFirst</constant> or <constant>MSBFirst</constant>.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>guid</structfield></term>

-		    <listitem><para>

-	This is the Globally Unique IDentifier for the format.  When

-	not applicable, all characters should be NULL.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>bits_per_pixel</structfield></term>

-		    <listitem><para>

-	The number of bits taken up (but not necessarily used) by each

-	pixel.  Note that for some planar formats which have fractional

-	bits per pixel (such as IF09) this number may be rounded _down_.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>format</structfield></term>

-		    <listitem><para>

-	This is <constant>XvPlanar</constant> or <constant>XvPacked</constant>.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>num_planes</structfield></term>

-		    <listitem><para>

-	The number of planes in planar formats.  This should be set to

-	one for packed formats.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>depth</structfield></term>

-		    <listitem><para>

-	The significant bits per pixel in RGB formats (analgous to the

-	depth of a pixmap format).

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>red_mask</structfield></term>

-		    <term><structfield>green_mask</structfield></term>

-		    <term><structfield>blue_mask</structfield></term>

-		    <listitem><para>

-	The red, green and blue bitmasks for packed RGB formats.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>y_sample_bits</structfield></term>

-		    <term><structfield>u_sample_bits</structfield></term>

-		    <term><structfield>v_sample_bits</structfield></term>

-		    <listitem><para>

-	The y, u and v sample sizes (in bits).

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>horz_y_period</structfield></term>

-		    <term><structfield>horz_u_period</structfield></term>

-		    <term><structfield>horz_v_period</structfield></term>

-		    <listitem><para>

-	The y, u and v sampling periods in the horizontal direction.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>vert_y_period</structfield></term>

-		    <term><structfield>vert_u_period</structfield></term>

-		    <term><structfield>vert_v_period</structfield></term>

-		    <listitem><para>

-	The y, u and v sampling periods in the vertical direction.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>component_order</structfield></term>

-		    <listitem><para>

-	Uppercase ascii characters representing the order that

-	samples are stored within packed formats.  For planar formats

-	this represents the ordering of the planes.  Unused characters

-	in the 32 byte string should be set to NULL.

-		      </para></listitem></varlistentry>

-

-		  <varlistentry>

-		    <term><structfield>scanline_order</structfield></term>

-		    <listitem><para>

-	This is <constant>XvTopToBottom</constant> or <constant>XvBottomToTop</constant>.

-		      </para></listitem></varlistentry>

-

-		  </variablelist>

-	    </para>

-

-	    <para>

-  Since some formats (particular some planar YUV formats) may not

-be completely defined by the parameters above, the guid, when

-available, should provide the most accurate description of the

-format.

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </para>

-  </sect1>

-

-  <sect1>

-    <title>The Loader</title>

-

-    <para>

-This section describes the interfaces to the module loader.  The loader

-interfaces can be divided into two groups: those that are only available to

-the XFree86 common layer, and those that are also available to modules.

-    </para>

-

-    <sect2>

-      <title>Loader Overview</title>

-

-      <para>

-The loader is capable of loading modules in a range of object formats,

-and knowledge of these formats is built in to the loader.  Knowledge of

-new object formats can be added to the loader in a straightforward

-manner.  This makes it possible to provide OS-independent modules (for

-a given CPU architecture type).  In addition to this, the loader can

-load modules via the OS-provided <function>dlopen(3)</function> service where

-available.  Such modules are not platform independent, and the semantics

-of <function>dlopen()</function> on most systems results in significant

-limitations in the use of modules of this type.  Support for

-<function>dlopen()</function> modules in the loader is primarily for

-experimental and development purposes.

-      </para>

-

-      <para>

-Symbols exported by the loader (on behalf of the core X server) to

-modules are determined at compile time.  Only those symbols explicitly

-exported are available to modules.  All external symbols of loaded

-modules are exported to other modules, and to the core X server.  The

-loader can be requested to check for unresolved symbols at any time,

-and the action to be taken for unresolved symbols can be controlled by

-the caller of the loader.  Typically the caller identifies which symbols

-can safely remain unresolved and which cannot.

-      </para>

-

-      <para>

-NOTE:  Now that ISO-C allows pointers to functions and pointers to data to

-have different internal representations, some of the following interfaces

-will need to be revisited.

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>Semi-private Loader Interface</title>

-

-      <para>

-The following is the semi-private loader interface that is available to the

-XFree86 common layer.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoaderInit(void);

-	  </programlisting>

-	  <blockquote><para>

-    The <function>LoaderInit()</function> function initialises the loader,

-    and it must be called once before calling any other loader functions.

-    This function initialises the tables of exported symbols, and anything

-    else that might need to be initialised.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoaderSetPath(const char *path);

-	  </programlisting>

-	  <blockquote><para>

-    The <function>LoaderSetPath()</function> function initialises a default

-    module search path.  This must be called if calls to other functions

-    are to be made without explicitly specifying a module search path.

-    The search path <parameter>path</parameter> must be a string of one or more

-    comma separated absolute paths.  Modules are expected to be located

-    below these paths, possibly in subdirectories of these paths.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    pointer LoadModule(const char *module, const char *path,

-                       const char **subdirlist, const char **patternlist,

-                       pointer options, const XF86ModReqInfo * modreq,

-                       int *errmaj, int *errmin);

-	  </programlisting>

-	  <blockquote><para>

-    The <function>LoadModule()</function> function loads the module called

-    <parameter>module</parameter>.  The return value is a module handle, and

-    may be used in future calls to the loader that require a reference

-    to a loaded module.  The module name <parameter>module</parameter> is

-    normally the module's canonical name, which doesn't contain any

-    directory path information, or any object/library file prefixes of

-    suffixes.  Currently a full pathname and/or filename is also accepted.

-    This might change.  The other parameters are:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><parameter>path</parameter></term>

-		  <listitem><para>

-		  An optional comma-separated list of module search paths.

-		  When <constant>NULL</constant>, the default search path is used.

-		    </para></listitem></varlistentry>

-

-

-		<varlistentry>

-		  <term><parameter>subdirlist</parameter></term>

-		  <listitem><para>

-		  An optional <constant>NULL</constant> terminated list of

-		  subdirectories to search.  When <constant>NULL</constant>,

-		  the default built-in list is used (refer to

-		  <varname>stdSubdirs</varname> in <filename>loadmod.c</filename>).

-		  The default list is also substituted for entries in

-		  <parameter>subdirlist</parameter> with the value

-		  <constant>DEFAULT_LIST</constant>.  This makes is possible

-		  to augment the default list instead of replacing it.

-		  Subdir elements must be relative, and must not contain

-		  <literal remap="tt">".."</literal>.  If any violate this requirement,

-		  the load fails.

-		    </para></listitem></varlistentry>

-

-

-		<varlistentry>

-		  <term><parameter>patternlist</parameter></term>

-		  <listitem><para>

-		  An optional <constant>NULL</constant> terminated list of

-		  POSIX regular expressions used to connect module

-		  filenames with canonical module names.  Each regex

-		  should contain exactly one subexpression that corresponds

-		  to the canonical module name.  When <constant>NULL</constant>,

-		  the default built-in list is used (refer to

-		  <varname>stdPatterns</varname> in

-		  <filename>loadmod.c</filename>).  The default list is also

-		  substituted for entries in <parameter>patternlist</parameter>

-		  with the value <constant>DEFAULT_LIST</constant>.  This

-		  makes it possible to augment the default list instead

-		  of replacing it.

-		    </para></listitem></varlistentry>

-

-

-		<varlistentry>

-		  <term><parameter>options</parameter></term>

-		  <listitem><para>

-		  An optional parameter that is passed to the newly

-		  loaded module's <literal remap="tt">SetupProc</literal> function

-		  (if it has one).  This argument is normally a

-		  <constant>NULL</constant> terminated list of

-		  <structname>Options</structname>, and must be interpreted that

-		  way by modules loaded directly by the XFree86 common

-		  layer.  However, it may be used for application-specific

-		  parameter passing in other situations.

-		    </para>

-

-		    <para>

-		  When loading <quote>external</quote> modules (modules that don't

-		  have the standard entry point, for example a

-		  special shared library) the options parameter can be

-		  set to <constant>EXTERN_MODULE</constant> to tell the

-		  loader not to reject the module when it doesn't find

-		  the standard entry point.

-		    </para></listitem></varlistentry>

-

-

-		<varlistentry>

-		  <term><parameter>modreq</parameter></term>

-		  <listitem><para>

-		  An optional <structname>XF86ModReqInfo*</structname> containing

-		  version/ABI/vendor information to requirements to

-		  check the newly loaded module against.  The main

-		  purpose of this is to allow the loader to verify that

-		  a module of the correct type/version before running

-		  its <function>SetupProc</function> function.

-		      </para>

-

-		    <para>

-		  The <literal remap="tt">XF86ModReqInfo</literal> struct is defined

-		  as follows:

-		      <programlisting>

-typedef struct {

-	CARD8        majorversion;  /* MAJOR_UNSPEC */

-	CARD8        minorversion;  /* MINOR_UNSPEC */

-	CARD16       patchlevel;    /* PATCH_UNSPEC */

-	const char * abiclass;      /* ABI_CLASS_NONE */

-	CARD32       abiversion;    /* ABI_VERS_UNSPEC */

-	const char * moduleclass;   /* MOD_CLASS_NONE */

-} XF86ModReqInfo;

-			</programlisting>

-

-		  The information here is compared against the equivalent

-		  information in the module's

-		  <structname>XF86ModuleVersionInfo</structname> record (which

-		  is described below).  The values in comments above

-		  indicate <quote>don't care</quote> settings for each of the fields.

-		  The comparisons made are as follows:

-

-		      <variablelist>

-			<varlistentry>

-			  <term><structfield>majorversion</structfield></term>

-			  <listitem><para>

-				   Must match the module's majorversion

-				   exactly.

-			    </para></listitem></varlistentry>

-

-			<varlistentry>

-			  <term><structfield>minorversion</structfield></term>

-			  <listitem><para>

-				   The module's minor version must be

-				   no less than this value.  This

-				   comparison is only made if

-				   <structfield>majorversion</structfield> is

-				   specified and matches.

-			    </para></listitem></varlistentry>

-

-			<varlistentry>

-			  <term><structfield>patchlevel</structfield></term>

-			  <listitem><para>

-				   The module's patchlevel must be no

-				   less than this value.  This comparison

-				   is only made if

-				   <structfield>minorversion</structfield> is

-				   specified and matches.

-			    </para></listitem></varlistentry>

-

-			<varlistentry>

-			  <term><structfield>abiclass</structfield></term>

-			  <listitem><para>

-				   String must match the module's abiclass

-				   string.

-			    </para></listitem></varlistentry>

-

-			<varlistentry>

-			  <term><structfield>abiversion</structfield></term>

-			  <listitem><para>

-				   Must be consistent with the module's

-				   abiversion (major equal, minor no

-				   older).

-			    </para></listitem></varlistentry>

-

-			<varlistentry>

-			  <term><structfield>moduleclass</structfield></term>

-			  <listitem><para>

-				   String must match the module's

-				   moduleclass string.

-			    </para></listitem></varlistentry>

-

-		      </variablelist>

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>errmaj</parameter></term>

-		  <listitem><para>

-		  An optional pointer to a variable holding the major

-		  part or the error code.  When provided,

-		  <parameter>*errmaj</parameter> is filled in when

-		  <function>LoadModule()</function> fails.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>errmin</parameter></term>

-		  <listitem><para>

-		  Like <parameter>errmaj</parameter>, but for the minor part

-		  of the error code.

-		    </para></listitem></varlistentry>

-

-	      </variablelist>

-

-	    </para></blockquote>

-	</para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void UnloadModule(pointer mod);

-	  </programlisting>

-	  <blockquote><para>

-    This function unloads the module referred to by the handle mod.

-    All child modules are also unloaded recursively.  This function must

-    not be used to directly unload modules that are child modules (i.e.,

-    those that have been loaded with the <function>LoadSubModule()</function>

-    described below).

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Module Requirements</title>

-

-      <para>

-Modules must provide information about themselves to the loader, and

-may optionally provide entry points for "setup" and "teardown" functions

-(those two functions are referred to here as <function>SetupProc</function>

-and <function>TearDownProc</function>).

-      </para>

-

-      <para>

-The module information is contained in the

-<structname>XF86ModuleVersionInfo</structname> struct, which is defined as follows:

-

-	<programlisting>

-typedef struct {

-    const char * modname;      /* name of module, e.g. "foo" */

-    const char * vendor;       /* vendor specific string */

-    CARD32       _modinfo1_;   /* constant MODINFOSTRING1/2 to find */

-    CARD32       _modinfo2_;   /* infoarea with a binary editor/sign tool */

-    CARD32       xf86version;  /* contains XF86_VERSION_CURRENT */

-    CARD8        majorversion; /* module-specific major version */

-    CARD8        minorversion; /* module-specific minor version */

-    CARD16       patchlevel;   /* module-specific patch level */

-    const char * abiclass;     /* ABI class that the module uses */

-    CARD32       abiversion;   /* ABI version */

-    const char * moduleclass;  /* module class */

-    CARD32       checksum[4];  /* contains a digital signature of the */

-                               /* version info structure */

-} XF86ModuleVersionInfo;

-	</programlisting>

-

-The fields are used as follows:

-

-	<variablelist>

-	  <varlistentry>

-	    <term><structfield>modname</structfield></term>

-	    <listitem><para>

-		The module's name.  This field is currently only for

-		informational purposes, but the loader may be modified

-		in future to require it to match the module's canonical

-                name.

-	      </para></listitem></varlistentry>

-

-

-	  <varlistentry>

-	    <term><structfield>vendor</structfield></term>

-	    <listitem><para>

-		The module vendor.  This field is for informational purposes

-                only.

-	      </para></listitem></varlistentry>

-

-

-	  <varlistentry>

-	    <term><structfield>_modinfo1_</structfield></term>

-	    <listitem><para>

-		This field holds the first part of a signature that can

-                be used to locate this structure in the binary.  It should

-		always be initialised to <constant>MODINFOSTRING1</constant>.

-	      </para></listitem></varlistentry>

-

-

-	  <varlistentry>

-	    <term><structfield>_modinfo2_</structfield></term>

-	    <listitem><para>

-		This field holds the second part of a signature that can

-                be used to locate this structure in the binary.  It should

-		always be initialised to <constant>MODINFOSTRING2</constant>.

-	      </para></listitem></varlistentry>

-

-

-	  <varlistentry>

-	    <term><structfield>xf86version</structfield></term>

-	    <listitem><para>

-		The XFree86 version against which the module was compiled.

-                This is mostly for informational/diagnostic purposes.  It

-		should be initialised to <constant>XF86_VERSION_CURRENT</constant>, which is

-		defined in <filename>xf86Version.h</filename>.

-	      </para></listitem></varlistentry>

-

-

-	  <varlistentry>

-	    <term><structfield>majorversion</structfield></term>

-	    <listitem><para>

-		The module-specific major version.  For modules where this

-		version is used for more than simply informational

-		purposes, the major version should only change (be

-		incremented) when ABI incompatibilities are introduced,

-		or ABI components are removed.

-	      </para></listitem></varlistentry>

-

-

-	  <varlistentry>

-	    <term><structfield>minorversion</structfield></term>

-	    <listitem><para>

-		The module-specific minor version.  For modules where this

-		version is used for more than simply informational

-		purposes, the minor version should only change (be

-		incremented) when ABI additions are made in a backward

-		compatible way.  It should be reset to zero when the major

-                version is increased.

-	      </para></listitem></varlistentry>

-

-

-	  <varlistentry>

-	    <term><structfield>patchlevel</structfield></term>

-	    <listitem><para>

-		The module-specific patch level.  The patch level should

-		increase with new revisions of the module where there

-		are no ABI changes, and it should be reset to zero when

-		the minor version is increased.

-	      </para></listitem></varlistentry>

-

-

-	  <varlistentry>

-	    <term><structfield>abiclass</structfield></term>

-	    <listitem><para>

-		The ABI class that the module requires.  The class is

-                specified as a string for easy extensibility.  It should

-		indicate which (if any) of the X server's built-in ABI

-		classes that the module relies on, or a third-party ABI

-                if appropriate.  Built-in ABI classes currently defined are:

-

-		<variablelist>

-		  <varlistentry>

-		    <term><constant>ABI_CLASS_NONE</constant></term>

-		    <listitem><para>no class

-		      </para></listitem></varlistentry>

-		  <varlistentry>

-		    <term><constant>ABI_CLASS_ANSIC</constant></term>

-		    <listitem><para>only requires the ANSI C interfaces

-		      </para></listitem></varlistentry>

-		  <varlistentry>

-		    <term><constant>ABI_CLASS_VIDEODRV</constant></term>

-		    <listitem><para>requires the video driver ABI

-		      </para></listitem></varlistentry>

-		  <varlistentry>

-		    <term><constant>ABI_CLASS_XINPUT</constant></term>

-		    <listitem><para>requires the XInput driver ABI

-		      </para></listitem></varlistentry>

-		  <varlistentry>

-		    <term><constant>ABI_CLASS_EXTENSION</constant></term>

-		    <listitem><para>requires the extension module ABI

-		      </para></listitem></varlistentry>

-		  <varlistentry>

-		    <term><constant>ABI_CLASS_FONT</constant></term>

-		    <listitem><para>requires the font module ABI

-		      </para></listitem></varlistentry>

-		</variablelist>

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>abiversion</structfield></term>

-	    <listitem><para>

-		The version of abiclass that the module requires.  The

-		version consists of major and minor components.  The

-		major version must match and the minor version must be

-		no newer than that provided by the server or parent

-		module.  Version identifiers for the built-in classes

-		currently defined are:

-

-		<literallayout><constant>

-                   ABI_ANSIC_VERSION

-                   ABI_VIDEODRV_VERSION

-                   ABI_XINPUT_VERSION

-                   ABI_EXTENSION_VERSION

-                   ABI_FONT_VERSION

-		  </constant></literallayout>

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>moduleclass</structfield></term>

-	    <listitem><para>

-		This is similar to the abiclass field, except that it

-		defines the type of module rather than the ABI it

-		requires.  For example, although all video drivers require

-		the video driver ABI, not all modules that require the

-		video driver ABI are video drivers.  This distinction

-		can be made with the moduleclass.  Currently pre-defined

-		module classes are:

-

-		<literallayout><constant>

-                   MOD_CLASS_NONE

-                   MOD_CLASS_VIDEODRV

-                   MOD_CLASS_XINPUT

-                   MOD_CLASS_FONT

-                   MOD_CLASS_EXTENSION

-		  </constant></literallayout>

-

-	      </para></listitem></varlistentry>

-

-	  <varlistentry>

-	    <term><structfield>checksum</structfield></term>

-	    <listitem><para>

-		Not currently used.

-	      </para></listitem></varlistentry>

-

-	</variablelist>

-      </para>

-

-      <para>

-The module version information, and the optional <function>SetupProc</function>

-and <function>TearDownProc</function> entry points are found by the loader

-by locating a data object in the module called "modnameModuleData",

-where "modname" is the canonical name of the module.  Modules must

-contain such a data object, and it must be declared with global scope,

-be compile-time initialised, and is of the following type:

-

-	<programlisting>

-typedef struct {

-    XF86ModuleVersionInfo *     vers;

-    ModuleSetupProc             setup;

-    ModuleTearDownProc          teardown;

-} XF86ModuleData;

-	</programlisting>

-      </para>

-

-      <para>

-The vers parameter must be initialised to a pointer to a correctly

-initialised <structname>XF86ModuleVersionInfo</structname> struct.  The other

-two parameter are optional, and should be initialised to

-<constant>NULL</constant> when not required.  The other parameters are defined

-as

-

-	<blockquote><para>

-	    <programlisting>

-    typedef pointer (*ModuleSetupProc)(pointer, pointer, int *, int *);

-

-    typedef void (*ModuleTearDownProc)(pointer);

-

-    pointer SetupProc(pointer module, pointer options,

-                      int *errmaj, int *errmin);

-	    </programlisting>

-	    <blockquote><para>

-    When defined, this function is called by the loader after successfully

-    loading a module.  module is a handle for the newly loaded module,

-    and maybe used by the <function>SetupProc</function> if it calls other

-    loader functions that require a reference to it.   The remaining

-    arguments are those that were passed to the

-    <function>LoadModule()</function> (or <function>LoadSubModule()</function>),

-    and are described above. When the <function>SetupProc</function> is

-    successful it must return a non-<constant>NULL</constant> value.  The

-    loader checks this, and if it is <constant>NULL</constant> it unloads

-    the module and reports the failure to the caller of

-    <function>LoadModule()</function>.  If the <function>SetupProc</function>

-    does things that need to be undone when the module is unloaded,

-    it should define a <function>TearDownProc</function>, and return a

-    pointer that the <function>TearDownProc</function> can use to undo what

-    has been done.

-	      </para>

-

-	      <para>

-    When a module is loaded multiple times, the <function>SetupProc</function>

-    is called once for each time it is loaded.

-	      </para>

-

-	    </blockquote></para></blockquote>

-

-	<blockquote><para>

-	    <programlisting>

-    void TearDownProc(pointer tearDownData);

-	    </programlisting>

-	    <blockquote><para>

-    When defined, this function is called when the loader unloads a

-    module.  The <parameter>tearDownData</parameter> parameter is the return

-    value of the <function>SetupProc()</function> that was called when the

-    module was loaded.  The purpose of this function is to clean up

-    before the module is unloaded (for example, by freeing allocated

-    resources).

-	      </para>

-

-	    </blockquote></para></blockquote>

-      </para>

-    </sect2>

-

-    <sect2>

-      <title>Public Loader Interface</title>

-

-      <para>

-The following is the Loader interface that is available to any part of

-the server, and may also be used from within modules.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    pointer LoadSubModule(pointer parent, const char *module,

-                          const char **subdirlist, const char **patternlist,

-                          pointer options, const XF86ModReqInfo * modreq,

-                          int *errmaj, int *errmin);

-	  </programlisting>

-	  <blockquote><para>

-    This function is like the <function>LoadModule()</function> function

-    described above, except that the module loaded is registered as a

-    child of the calling module.  The <parameter>parent</parameter> parameter

-    is the calling module's handle.  Modules loaded with this function

-    are automatically unloaded when the parent module is unloaded.  The

-    other difference is that the path parameter may not be specified.

-    The module search path used for modules loaded with this function

-    is the default search path as initialised with

-    <function>LoaderSetPath()</function>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void UnloadSubModule(pointer module);

-	  </programlisting>

-	  <blockquote><para>

-    This function unloads the module with handle <parameter>module</parameter>.

-    If that module itself has children, they are also unloaded.  It is

-    like <function>UnloadModule()</function>, except that it is safe to use

-    for unloading child modules.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    pointer LoaderSymbol(const char *symbol);

-	  </programlisting>

-	<blockquote><para>

-    This function returns the address of the symbol with name

-    <parameter>symbol</parameter>.  This may be used to locate a module entry

-    point with a known name.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    char **LoaderlistDirs(const char **subdirlist,

-                          const char **patternlist);

-	  </programlisting>

-	  <blockquote><para>

-    This function returns a <constant>NULL</constant> terminated list of

-    canonical modules names for modules found in the default module

-    search path.  The <parameter>subdirlist</parameter> and

-    <parameter>patternlist</parameter> parameters are as described above, and

-    can be used to control the locations and names that are searched.

-    If no modules are found, the return value is <constant>NULL</constant>.

-    The returned list should be freed by calling

-    <function>LoaderFreeDirList()</function> when it is no longer needed.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoaderFreeDirList(char **list);

-	  </programlisting>

-	  <blockquote><para>

-    This function frees a module list created by

-    <function>LoaderlistDirs()</function>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoaderReqSymLists(const char **list0, ...);

-	  </programlisting>

-	  <blockquote><para>

-    This function allows the registration of required symbols with the

-    loader.  It is normally used by a caller of

-    <function>LoadSubModule()</function>.  If any symbols registered in this

-    way are found to be unresolved when

-    <function>LoaderCheckUnresolved()</function> is called then

-    <function>LoaderCheckUnresolved()</function> will report a failure.

-    The function takes one or more <constant>NULL</constant> terminated

-    lists of symbols.  The end of the argument list is indicated by a

-    <constant>NULL</constant> argument.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoaderReqSymbols(const char *sym0, ...);

-	  </programlisting>

-	<blockquote><para>

-    This function is like <function>LoaderReqSymLists()</function> except

-    that its arguments are symbols rather than lists of symbols.  This

-    function is more convenient when single functions are to be registered,

-    especially when the single function might depend on runtime factors.

-    The end of the argument list is indicated by a <constant>NULL</constant>

-    argument.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoaderRefSymLists(const char **list0, ...);

-	  </programlisting>

-	  <blockquote><para>

-    This function allows the registration of possibly unresolved symbols

-    with the loader.  When <function>LoaderCheckUnresolved()</function> is

-    run it won't generate warnings for symbols registered in this way

-    unless they were also registered as required symbols.

-    The function takes one or more <constant>NULL</constant> terminated

-    lists of symbols.  The end of the argument list is indicated by a

-    <constant>NULL</constant> argument.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoaderRefSymbols(const char *sym0, ...);

-	  </programlisting>

-	  <blockquote><para>

-    This function is like <function>LoaderRefSymLists()</function> except

-    that its arguments are symbols rather than lists of symbols.  This

-    function is more convenient when single functions are to be registered,

-    especially when the single function might depend on runtime factors.

-    The end of the argument list is indicated by a <constant>NULL</constant>

-    argument.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    int LoaderCheckUnresolved(int delayflag);

-	  </programlisting>

-	  <blockquote><para>

-    This function checks for unresolved symbols.  It generates warnings

-    for unresolved symbols that have not been registered with

-    <function>LoaderRefSymLists()</function>, and maps them to a dummy

-    function.  This behaviour may change in future.  If unresolved

-    symbols are found that have been registered with

-    <function>LoaderReqSymLists()</function> or

-    <function>LoaderReqSymbols()</function> then this function returns a

-    non-zero value.  If none of these symbols are unresolved the return

-    value is zero, indicating success.

-	    </para>

-

-	    <para>

-    The <parameter>delayflag</parameter> parameter should normally be set to

-    <constant>LD_RESOLV_IFDONE</constant>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    LoaderErrorMsg(const char *name, const char *modname,

-                   int errmaj, int errmin);

-	  </programlisting>

-	  <blockquote><para>

-    This function prints an error message that includes the text <quote>Failed

-    to load module</quote>, the module name <parameter>modname</parameter>, a message

-    specific to the <parameter>errmaj</parameter> value, and the value if

-    <parameter>errmin</parameter>.  If <parameter>name</parameter> is

-    non-<constant>NULL</constant>, it is printed as an identifying prefix

-    to the message (followed by a <quote>:</quote>).

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Special Registration Functions</title>

-

-      <para>

-The loader contains some functions for registering some classes of modules.

-These may be moved out of the loader at some point.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoadExtension(ExtensionModule *ext);

-	  </programlisting>

-	  <blockquote><para>

-    This registers the entry points for the extension identified by

-    <parameter>ext</parameter>.  The <structname>ExtensionModule</structname> struct is

-    defined as:

-

-	      <programlisting>

-typedef struct {

-    InitExtension       initFunc;

-    char *              name;

-    Bool                *disablePtr;

-    InitExtension       setupFunc;

-} ExtensionModule;

-	      </programlisting>

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void LoadFont(FontModule *font);

-	  </programlisting>

-	  <blockquote><para>

-    This registers the entry points for the font rasteriser module

-    identified by <parameter>font</parameter>.  The <structname>FontModule</structname>

-    struct is defined as:

-

-	      <programlisting>

- typedef struct {

-    InitFont    initFunc;

-    char *      name;

-    pointer     module;

-} FontModule;

-	      </programlisting>

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-    </sect2>

-

-  </sect1>

-

-  <sect1>

-    <title>Helper Functions</title>

-

-    <para>

-This section describe <quote>helper</quote> functions that video driver

-might find useful.  While video drivers are not required to use any of

-these to be considered <quote>compliant</quote>, the use of appropriate helpers is

-strongly encouraged to improve the consistency of driver behaviour.

-    </para>

-

-    <sect2>

-      <title>Functions for printing messages</title>

-

-      <blockquote><para>

-	  <programlisting>

-    ErrorF(const char *format, ...);

-	  </programlisting>

-	  <blockquote><para>

-      This is the basic function for writing to the error log (typically

-      stderr and/or a log file).  Video drivers should usually avoid

-      using this directly in favour of the more specialised functions

-      described below.  This function is useful for printing messages

-      while debugging a driver.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    FatalError(const char *format, ...);

-	  </programlisting>

-	  <blockquote><para>

-      This prints a message and causes the Xserver to abort.  It should

-      rarely be used within a video driver, as most error conditions

-      should be flagged by the return values of the driver functions.

-      This allows the higher layers to decide how to proceed.  In rare

-      cases, this can be used within a driver if a fatal unexpected

-      condition is found.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    xf86ErrorF(const char *format, ...);

-	  </programlisting>

-	  <blockquote><para>

-      This is like <function>ErrorF()</function>, except that the message is

-      only printed when the Xserver's verbosity level is set to the

-      default (<constant>1</constant>) or higher.  It means that the messages

-      are not printed when the server is started with the

-      <option>-quiet</option> flag.  Typically this function would only be

-      used for continuing messages started with one of the more specialised

-      functions described below.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    xf86ErrorFVerb(int verb, const char *format, ...);

-	  </programlisting>

-	  <blockquote><para>

-      Like <function>xf86ErrorF()</function>, except the minimum verbosity

-      level for which the message is to be printed is given explicitly.

-      Passing a <parameter>verb</parameter> value of zero means the message

-      is always printed.  A value higher than <constant>1</constant> can be

-      used for information would normally not be needed, but which might

-      be useful when diagnosing problems.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-

-      <blockquote><para>

-	  <programlisting>

-    xf86Msg(MessageType type, const char *format, ...);

-	  </programlisting>

-	  <blockquote><para>

-      This is like <function>xf86ErrorF()</function>, except that the message

-      is prefixed with a marker determined by the value of

-      <parameter>type</parameter>.  The marker is used to indicate the type of

-      message (warning, error, probed value, config value, etc).  Note

-      the <varname>xf86Verbose</varname> value is ignored for messages of

-      type <constant>X_ERROR</constant>.

-	    </para>

-

-	    <para>

-      The marker values are:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><constant>X_PROBED</constant></term>

-		  <listitem><para>Value was probed.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_CONFIG</constant></term>

-		  <listitem><para>Value was given in the config file.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_DEFAULT</constant></term>

-		  <listitem><para>Value is a default.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_CMDLINE</constant></term>

-		  <listitem><para>Value was given on the command line.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_NOTICE</constant></term>

-		  <listitem><para>Notice.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_ERROR</constant></term>

-		  <listitem><para>Error message.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_WARNING</constant></term>

-		  <listitem><para>Warning message.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_INFO</constant></term>

-		  <listitem><para>Informational message.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_NONE</constant></term>

-		  <listitem><para>No prefix.

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>X_NOT_IMPLEMENTED</constant></term>

-		  <listitem><para>The message relates to functionality

-		      that is not yetimplemented.

-		    </para></listitem></varlistentry>

-		</variablelist>

-

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    xf86MsgVerb(MessageType type, int verb, const char *format, ...);

-	  </programlisting>

-	  <blockquote><para>

-      Like <function>xf86Msg()</function>, but with the verbosity level given

-      explicitly.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    xf86DrvMsg(int scrnIndex, MessageType type, const char *format, ...);

-	  </programlisting>

-	  <blockquote><para>

-      This is like <function>xf86Msg()</function> except that the driver's

-      name (the <structfield>name</structfield> field of the

-      <structname>ScrnInfoRec</structname>) followed by the

-      <parameter>scrnIndex</parameter> in parentheses is printed following the

-      prefix.  This should be used by video drivers in most cases as it

-      clearly indicates which driver/screen the message is for.  If

-      <parameter>scrnIndex</parameter> is negative, this function behaves

-      exactly like <function>xf86Msg()</function>.

-	    </para>

-

-	    <para>

-      NOTE: This function can only be used after the

-      <structname>ScrnInfoRec</structname> and its <structfield>name</structfield> field

-      have been allocated.  Normally, this means that it can not be

-      used before the END of the <function>ChipProbe()</function> function.

-      Prior to that, use <function>xf86Msg()</function>, providing the

-      driver's name explicitly.  No screen number can be supplied at

-      that point.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    xf86DrvMsgVerb(int scrnIndex, MessageType type, int verb,

-                                const char *format, ...);

-	  </programlisting>

-	  <blockquote><para>

-      Like <function>xf86DrvMsg()</function>, but with the verbosity level

-      given explicitly.

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </sect2>

-

-

-    <sect2>

-      <title>Functions for setting values based on command line and config file</title>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86SetDepthBpp(ScrnInfoPtr scrp, int depth, int bpp,

-

-                                int fbbpp, int depth24flags);

-	  </programlisting>

-	  <blockquote><para>

-      This function sets the <structfield>depth</structfield>, <structfield>pixmapBPP</structfield> and <structfield>bitsPerPixel</structfield> fields

-      of the <structname>ScrnInfoRec</structname>.  It also determines the defaults for display-wide

-      attributes and pixmap formats the screen will support, and finds

-      the Display subsection that matches the depth/bpp.  This function

-      should normally be called very early from the

-      <function>ChipPreInit()</function> function.

-	    </para>

-

-	    <para>

-      It requires that the <structfield>confScreen</structfield> field of the <structname>ScrnInfoRec</structname> be

-      initialised prior to calling it.  This is done by the XFree86

-      common layer prior to calling <function>ChipPreInit()</function>.

-	    </para>

-

-	    <para>

-      The parameters passed are:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><parameter>depth</parameter></term>

-		  <listitem><para>

-		driver's preferred default depth if no other is given.

-                If zero, use the overall server default.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>bpp</parameter></term>

-		  <listitem><para>

-		Same, but for the pixmap bpp.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>fbbpp</parameter></term>

-		  <listitem><para>

-		Same, but for the framebuffer bpp.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>depth24flags</parameter></term>

-		  <listitem><para>

-		Flags that indicate the level of 24/32bpp support

-                and whether conversion between different framebuffer

-                and pixmap formats is supported.  The flags for this

-                argument are defined as follows, and multiple flags

-                may be ORed together:

-

-		      <variablelist>

-			<varlistentry>

-			  <term><constant>NoDepth24Support</constant></term>

-			  <listitem><para>No depth 24 formats supported

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>Support24bppFb</constant></term>

-			  <listitem><para>24bpp framebuffer supported

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>Support32bppFb</constant></term>

-			  <listitem><para>32bpp framebuffer supported

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>SupportConvert24to32</constant></term>

-			  <listitem><para>Can convert 24bpp pixmap to 32bpp fb

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>SupportConvert32to24</constant></term>

-			  <listitem><para>Can convert 32bpp pixmap to 24bpp fb

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>ForceConvert24to32</constant></term>

-			  <listitem><para>Force 24bpp pixmap to 32bpp fb conversion

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>ForceConvert32to24</constant></term>

-			  <listitem><para>Force 32bpp pixmap to 24bpp fb conversion

-			    </para></listitem></varlistentry>

-		      </variablelist>

-		    </para></listitem></varlistentry>

-

-	      </variablelist>

-	    </para>

-

-	    <para>

-      It uses the command line, config file, and default values in the

-      correct order of precedence to determine the depth and bpp values.

-      It is up to the driver to check the results to see that it supports

-      them.  If not the <function>ChipPreInit()</function> function should

-      return <constant>FALSE</constant>.

-	    </para>

-

-	    <para>

-      If only one of depth/bpp is given, the other is set to a reasonable

-      (and consistent) default.

-	    </para>

-

-	    <para>

-      If a driver finds that the initial <parameter>depth24flags</parameter>

-      it uses later results in a fb format that requires more video

-      memory than is available it may call this function a second time

-      with a different <parameter>depth24flags</parameter> setting.

-	    </para>

-

-	    <para>

-      On success, the return value is <constant>TRUE</constant>.  On failure

-      it prints an error message and returns <constant>FALSE</constant>.

-	    </para>

-

-	    <para>

-      The following fields of the <structname>ScrnInfoRec</structname> are

-      initialised by this function:

-

-	      <blockquote><para>

-<structfield>depth</structfield>, <structfield>bitsPerPixel</structfield>,

-<structfield>display</structfield>, <structfield>imageByteOrder</structfield>,

-<structfield>bitmapScanlinePad</structfield>,

-<structfield>bitmapScanlineUnit</structfield>, <structfield>bitmapBitOrder</structfield>,

-<structfield>numFormats</structfield>, <structfield>formats</structfield>,

-<structfield>fbFormat</structfield>.

-		</para></blockquote>

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86PrintDepthBpp(scrnInfoPtr scrp);

-	  </programlisting>

-	  <blockquote><para>

-      This function can be used to print out the depth and bpp settings.

-      It should be called after the final call to

-      <function>xf86SetDepthBpp()</function>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86SetWeight(ScrnInfoPtr scrp, rgb weight, rgb mask);

-	  </programlisting>

-	  <blockquote><para>

-      This function sets the <structfield>weight</structfield>, <structfield>mask</structfield>,

-      <structfield>offset</structfield> and <structfield>rgbBits</structfield> fields of the

-      <structname>ScrnInfoRec</structname>.  It would normally be called fairly

-      early in the <function>ChipPreInit()</function> function for

-      depths&nbsp;&gt;&nbsp;8bpp.

-	    </para>

-

-	    <para>

-      It requires that the <structfield>depth</structfield> and

-      <structfield>display</structfield> fields of the <structname>ScrnInfoRec</structname>

-      be initialised prior to calling it.

-	    </para>

-

-	    <para>

-      The parameters passed are:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><parameter>weight</parameter></term>

-		  <listitem><para>

-		driver's preferred default weight if no other is given.

-                If zero, use the overall server default.

-

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>mask</parameter></term>

-		  <listitem><para>

-		Same, but for mask.

-

-		    </para></listitem></varlistentry>

-	      </variablelist>

-	    </para>

-

-	    <para>

-      It uses the command line, config file, and default values in the

-      correct order of precedence to determine the weight value.  It

-      derives the mask and offset values from the weight and the defaults.

-      It is up to the driver to check the results to see that it supports

-      them.  If not the <function>ChipPreInit()</function> function should

-      return <constant>FALSE</constant>.

-	    </para>

-

-	    <para>

-      On success, this function prints a message showing the weight

-      values selected, and returns <constant>TRUE</constant>.

-	    </para>

-

-	    <para>

-      On failure it prints an error message and returns <constant>FALSE</constant>.

-	    </para>

-

-	    <para>

-      The following fields of the <structname>ScrnInfoRec</structname> are

-      initialised by this function:

-

-	      <blockquote><para>

-		  <structfield>weight</structfield>,

-		  <structfield>mask</structfield>,

-		  <structfield>offset</structfield>.

-		</para></blockquote>

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86SetDefaultVisual(ScrnInfoPtr scrp, int visual);

-	  </programlisting>

-	  <blockquote><para>

-      This function sets the <structfield>defaultVisual</structfield> field of the

-      <structname>ScrnInfoRec</structname>.  It would normally be called fairly

-      early from the <function>ChipPreInit()</function> function.

-	    </para>

-

-	    <para>

-      It requires that the <structfield>depth</structfield> and

-      <structfield>display</structfield> fields of the <structname>ScrnInfoRec</structname>

-      be initialised prior to calling it.

-	    </para>

-

-	    <para>

-      The parameters passed are:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><parameter>visual</parameter></term>

-		  <listitem><para>

-		driver's preferred default visual if no other is given.

-		If <constant>-1</constant>, use the overall server default.

-		    </para></listitem></varlistentry>

-

-	      </variablelist>

-	    </para>

-

-	    <para>

-      It uses the command line, config file, and default values in the

-      correct order of precedence to determine the default visual value.

-      It is up to the driver to check the result to see that it supports

-      it.  If not the <function>ChipPreInit()</function> function should

-      return <constant>FALSE</constant>.

-	    </para>

-

-	    <para>

-      On success, this function prints a message showing the default visual

-      selected, and returns <constant>TRUE</constant>.

-	    </para>

-

-	    <para>

-      On failure it prints an error message and returns <constant>FALSE</constant>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86SetGamma(ScrnInfoPtr scrp, Gamma gamma);

-	  </programlisting>

-	  <blockquote><para>

-      This function sets the <structfield>gamma</structfield> field of the

-      <structname>ScrnInfoRec</structname>.  It would normally be called fairly

-      early from the <function>ChipPreInit()</function> function in cases

-      where the driver supports gamma correction.

-	    </para>

-

-	    <para>

-      It requires that the <structfield>monitor</structfield> field of the

-      <structname>ScrnInfoRec</structname> be initialised prior to calling it.

-	    </para>

-

-	    <para>

-      The parameters passed are:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><parameter>gamma</parameter></term>

-		  <listitem><para>

-		driver's preferred default gamma if no other is given.

-		If zero (<code>&lt; 0.01</code>), use the overall server

-		default.

-		    </para></listitem></varlistentry>

-

-	      </variablelist>

-	    </para>

-

-	    <para>

-      It uses the command line, config file, and default values in the

-      correct order of precedence to determine the gamma value.  It is

-      up to the driver to check the results to see that it supports

-      them.  If not the <function>ChipPreInit()</function> function should

-      return <constant>FALSE</constant>.

-	    </para>

-

-	    <para>

-      On success, this function prints a message showing the gamma

-      value selected, and returns <constant>TRUE</constant>.

-	    </para>

-

-	    <para>

-      On failure it prints an error message and returns <constant>FALSE</constant>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86SetDpi(ScrnInfoPtr pScrn, int x, int y);

-	  </programlisting>

-	  <blockquote><para>

-      This function sets the <structfield>xDpi</structfield> and <structfield>yDpi</structfield>

-      fields of the <structname>ScrnInfoRec</structname>.  The driver can specify

-      preferred defaults by setting <parameter>x</parameter> and <parameter>y</parameter>

-      to non-zero values.  The <option>-dpi</option> command line option

-      overrides all other settings.  Otherwise, if the

-      <emphasis>DisplaySize</emphasis> entry is present in the screen's &k.monitor;

-      config file section, it is used together with the virtual size to

-      calculate the dpi values.  This function should be called after

-      all the mode resolution has been done.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86SetBlackWhitePixels(ScrnInfoPtr pScrn);

-	  </programlisting>

-	  <blockquote><para>

-      This functions sets the <structfield>blackPixel</structfield> and

-      <structfield>whitePixel</structfield> fields of the <structname>ScrnInfoRec</structname>

-      according to whether or not the <option>-flipPixels</option> command

-      line options is present.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    const char *xf86GetVisualName(int visual);

-	  </programlisting>

-	  <blockquote><para>

-      Returns a printable string with the visual name matching the

-      numerical visual class provided.  If the value is outside the

-      range of valid visual classes, <constant>NULL</constant> is returned.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-    </sect2>

-

-    <sect2>

-      <title>Primary Mode functions</title>

-

-      <para>

-The primary mode helper functions are those which would normally be

-used by a driver, unless it has unusual requirements which cannot

-be catered for the by the helpers.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    int xf86ValidateModes(ScrnInfoPtr scrp, DisplayModePtr availModes,

-                          char **modeNames, ClockRangePtr clockRanges,

-                          int *linePitches, int minPitch, int maxPitch,

-                          int pitchInc, int minHeight, int maxHeight,

-                          int virtualX, int virtualY,

-                          unsigned long apertureSize,

-                          LookupModeFlags strategy);

-	  </programlisting>

-	  <blockquote><para>

-      This function basically selects the set of modes to use based on

-      those available and the various constraints.  It also sets some

-      other related parameters.  It is normally called near the end of

-      the <function>ChipPreInit()</function> function.

-	    </para>

-

-	    <para>

-      The parameters passed to the function are:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><parameter>availModes</parameter></term>

-		  <listitem><para>

-		List of modes available for the monitor.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>modeNames</parameter></term>

-		  <listitem><para>

-		List of mode names that the screen is requesting.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>clockRanges</parameter></term>

-		  <listitem><para>

-		A list of clock ranges allowed by the driver.  Each

-		range includes whether interlaced or multiscan modes

-		are supported for that range.  See below for more on

-		<parameter>clockRanges</parameter>.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>linePitches</parameter></term>

-		  <listitem><para>

-		List of line pitches supported by the driver.

-		This is optional and should be <constant>NULL</constant> when

-		not used.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>minPitch</parameter></term>

-		  <listitem><para>

-		Minimum line pitch supported by the driver.  This must

-		be supplied when <parameter>linePitches</parameter> is

-		<constant>NULL</constant>, and is ignored otherwise.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>maxPitch</parameter></term>

-		  <listitem><para>

-		Maximum line pitch supported by the driver.  This is

-		required when <parameter>minPitch</parameter> is required.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>pitchInc</parameter></term>

-		  <listitem><para>

-		Granularity of horizontal pitch values as supported by

-		the chipset.  This is expressed in bits.  This must be

-		supplied.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>minHeight</parameter></term>

-		  <listitem><para>

-		minimum virtual height allowed.  If zero, no limit is

-		imposed.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>maxHeight</parameter></term>

-		  <listitem><para>

-		maximum virtual height allowed.  If zero, no limit is

-		imposed.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>virtualX</parameter></term>

-		  <listitem><para>

-		If greater than zero, this is the virtual width value

-		that will be used.  Otherwise, the virtual width is

-		chosen to be the smallest that can accommodate the modes

-		selected.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>virtualY</parameter></term>

-		  <listitem><para>

-		If greater than zero, this is the virtual height value

-		that will be used.  Otherwise, the virtual height is

-		chosen to be the smallest that can accommodate the modes

-		selected.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>apertureSize</parameter></term>

-		  <listitem><para>

-		The size (in bytes) of the aperture used to access video

-		memory.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><parameter>strategy</parameter></term>

-		  <listitem><para>

-		The strategy to use when choosing from multiple modes

-		with the same name.  The options are:

-

-		      <variablelist>

-			<varlistentry>

-			  <term><constant>LOOKUP_DEFAULT</constant></term>

-			  <listitem><para>???

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>LOOKUP_BEST_REFRESH</constant></term>

-			  <listitem><para>mode with best refresh rate

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>LOOKUP_CLOSEST_CLOCK</constant></term>

-			  <listitem><para>mode with closest matching clock

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>LOOKUP_LIST_ORDER</constant></term>

-			  <listitem><para>first usable mode in list

-			    </para></listitem></varlistentry>

-		      </variablelist>

-

-		The following options can also be combined (OR'ed) with

-		one of the above:

-

-		      <variablelist>

-			<varlistentry>

-			  <term><constant>LOOKUP_CLKDIV2</constant></term>

-			  <listitem><para>Allow halved clocks

-			    </para></listitem></varlistentry>

-			<varlistentry>

-			  <term><constant>LOOKUP_OPTIONAL_TOLERANCES</constant></term>

-			  <listitem><para>

-		      Allow missing horizontal sync and/or vertical refresh

-		      ranges in the xorg.conf Monitor section

-			    </para></listitem></varlistentry>

-		      </variablelist>

-

-		<constant>LOOKUP_OPTIONAL_TOLERANCES</constant> should only be

-		specified when the driver can ensure all modes it generates

-		can sync on, or at least not damage, the monitor or digital

-		flat panel.  Horizontal sync and/or vertical refresh ranges

-		specified by the user will still be honoured (and acted upon).

-

-		    </para></listitem></varlistentry>

-	      </variablelist>

-	    </para>

-

-	    <para>

-      This function requires that the following fields of the

-      <structname>ScrnInfoRec</structname> are initialised prior to calling it:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><structfield>clock[]</structfield></term>

-		  <listitem><para>

-		      List of discrete clocks (when non-programmable)

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>numClocks</structfield></term>

-		  <listitem><para>

-		      Number of discrete clocks (when non-programmable)

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>progClock</structfield></term>

-		  <listitem><para>

-		      Whether the clock is programmable or not

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>monitor</structfield></term>

-		  <listitem><para>

-		      Pointer to the applicable xorg.conf monitor section

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>fdFormat</structfield></term>

-		  <listitem><para>

-		      Format of the screen buffer

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>videoRam</structfield></term>

-		  <listitem><para>

-		      total video memory size (in bytes)

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>maxHValue</structfield></term>

-		  <listitem><para>

-		      Maximum horizontal timing value allowed

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>maxVValue</structfield></term>

-		  <listitem><para>

-		      Maximum vertical timing value allowed

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>xInc</structfield></term>

-		  <listitem><para>

-		      Horizontal timing increment in pixels (defaults to 8)

-		    </para></listitem></varlistentry>

-	      </variablelist>

-	    </para>

-

-	    <para>

-      This function fills in the following <structname>ScrnInfoRec</structname>

-      fields:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><structfield>modePool</structfield></term>

-		  <listitem><para>

-		A subset of the modes available to the monitor which

-                are compatible with the driver.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>modes</structfield></term>

-		  <listitem><para>

-		One mode entry for each of the requested modes, with

-                the status field of each filled in to indicate if

-                the mode has been accepted or not.  This list of

-                modes is a circular list.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>virtualX</structfield></term>

-		  <listitem><para>

-		The resulting virtual width.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>virtualY</structfield></term>

-		  <listitem><para>

-		The resulting virtual height.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>displayWidth</structfield></term>

-		  <listitem><para>

-		The resulting line pitch.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>virtualFrom</structfield></term>

-		  <listitem><para>

-		Where the virtual size was determined from.

-		    </para></listitem></varlistentry>

-

-	      </variablelist>

-	    </para>

-

-	    <para>

-      The first stage of this function checks that the

-      <parameter>virtualX</parameter> and <parameter>virtualY</parameter> values

-      supplied (if greater than zero) are consistent with the line pitch

-      and <parameter>maxHeight</parameter> limitations.  If not, an error

-      message is printed, and the return value is <constant>-1</constant>.

-	    </para>

-

-	    <para>

-      The second stage sets up the mode pool, eliminating immediately

-      any modes that exceed the driver's line pitch limits, and also

-      the virtual width and height limits (if greater than zero).  For

-      each mode removed an informational message is printed at verbosity

-      level <constant>2</constant>.  If the mode pool ends up being empty,

-      a warning message is printed, and the return value is

-      <constant>0</constant>.

-	    </para>

-

-	    <para>

-      The final stage is to lookup each mode name, and fill in the remaining

-      parameters.  If an error condition is encountered, a message is

-      printed, and the return value is <constant>-1</constant>.  Otherwise,

-      the return value is the number of valid modes found

-      (<constant>0</constant> if none are found).

-	    </para>

-

-	    <para>

-      Even if the supplied mode names include duplicates, no two names will

-      ever match the same mode.  Furthermore, if the supplied mode names do not

-      yield a valid mode (including the case where no names are passed at all),

-      the function will continue looking through the mode pool until it finds

-      a mode that survives all checks, or until the mode pool is exhausted.

-	    </para>

-

-	    <para>

-      A message is only printed by this function when a fundamental

-      problem is found.  It is intended that this function may be called

-      more than once if there is more than one set of constraints that

-      the driver can work within.

-	    </para>

-

-	    <para>

-      If this function returns <constant>-1</constant>, the

-      <function>ChipPreInit()</function> function should return

-      <constant>FALSE</constant>.

-	    </para>

-

-	    <para>

-      <parameter>clockRanges</parameter> is a linked list of clock ranges

-      allowed by the driver.  If a mode doesn't fit in any of the defined

-      <parameter>clockRanges</parameter>, it is rejected.  The first

-      <literal remap="tt">clockRange</literal> that matches all requirements is used.

-      This structure needs to be initialized to NULL when allocated.

-	    </para>

-

-	    <para>

-      <parameter>clockRanges</parameter> contains the following fields:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><structfield>minClock</structfield></term>

-		  <term><structfield>maxClock</structfield></term>

-		  <listitem><para>

-		The lower and upper mode clock bounds for which the rest

-		of the <structname>clockRange</structname> parameters apply.

-		Since these are the mode clocks, they are not scaled

-		with the <structfield>ClockMulFactor</structfield> and

-		<structfield>ClockDivFactor</structfield>.  It is up to the driver

-		to adjust these values if they depend on the clock

-		scaling factors.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>clockIndex</structfield></term>

-		  <listitem><para>

-		(not used yet) <constant>-1</constant> for programmable clocks

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>interlaceAllowed</structfield></term>

-		  <listitem><para>

-		<constant>TRUE</constant> if interlacing is allowed for this

-		range

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>doubleScanAllowed</structfield></term>

-		  <listitem><para>

-		<constant>TRUE</constant> if doublescan or multiscan is allowed

-		for this range

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>ClockMulFactor</structfield></term>

-		  <term><structfield>ClockDivFactor</structfield></term>

-		  <listitem><para>

-		Scaling factors that are applied to the mode clocks ONLY

-		before selecting a clock index (when there is no

-		programmable clock) or a <structfield>SynthClock</structfield>

-		value.  This is useful for drivers that support pixel

-		multiplexing or that need to scale the clocks because

-		of hardware restrictions (like sending 24bpp data to an

-		8 bit RAMDAC using a tripled clock).

-		    </para>

-

-		    <para>

-		Note that these parameters describe what must be done

-		to the mode clock to achieve the data transport clock

-		between graphics controller and RAMDAC.  For example

-		for <literal remap="tt">2:1</literal> pixel multiplexing, two pixels

-		are sent to the RAMDAC on each clock.  This allows the

-		RAMDAC clock to be half of the actual pixel clock.

-		Hence, <code>ClockMulFactor=1</code> and

-		<code>ClockDivFactor=2</code>.  This means that the

-		clock used for clock selection (ie, determining the

-		correct clock index from the list of discrete clocks)

-		or for the <structfield>SynthClock</structfield> field in case of

-		a programmable clock is:  (<code>mode-&gt;Clock *

-		ClockMulFactor) / ClockDivFactor</code>.

-		    </para></listitem></varlistentry>

-

-		<varlistentry>

-		  <term><structfield>PrivFlags</structfield></term>

-		  <listitem><para>

-		This field is copied into the

-		<literal remap="tt">mode-&gt;PrivFlags</literal> field when this

-		<literal remap="tt">clockRange</literal> is selected by

-		<function>xf86ValidateModes()</function>.  It allows the

-		driver to find out what clock range was selected, so it

-		knows it needs to set up pixel multiplexing or any other

-		range-dependent feature.  This field is purely

-		driver-defined: it may contain flag bits, an index or

-		anything else (as long as it is an <literal remap="tt">INT</literal>).

-		    </para></listitem></varlistentry>

-	      </variablelist>

-	    </para>

-

-	    <para>

-      Note that the <structfield>mode-&gt;SynthClock</structfield> field is always

-      filled in by <function>xf86ValidateModes()</function>: it will contain

-      the <quote>data transport clock</quote>, which is the clock that will have

-      to be programmed in the chip when it has a programmable clock, or

-      the clock that will be picked from the clocks list when it is not

-      a programmable one.  Thus:

-

-	      <programlisting>

-    mode-&gt;SynthClock = (mode-&gt;Clock * ClockMulFactor) / ClockDivFactor

-	      </programlisting>

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86PruneDriverModes(ScrnInfoPtr scrp);

-	  </programlisting>

-	  <blockquote><para>

-      This function deletes modes in the modes field of the

-      <structname>ScrnInfoRec</structname> that have been marked as invalid.

-      This is normally run after having run

-      <function>xf86ValidateModes()</function> for the last time.  For each

-      mode that is deleted, a warning message is printed out indicating

-      the reason for it being deleted.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86SetCrtcForModes(ScrnInfoPtr scrp, int adjustFlags);

-	  </programlisting>

-	  <blockquote><para>

-      This function fills in the <structname>Crtc*</structname> fields for all

-      the modes in the <structfield>modes</structfield> field of the

-      <structname>ScrnInfoRec</structname>.  The <parameter>adjustFlags</parameter>

-      parameter determines how the vertical CRTC values are scaled for

-      interlaced modes.  They are halved if it is

-      <constant>INTERLACE_HALVE_V</constant>.  The vertical CRTC values are

-      doubled for doublescan modes, and are further multiplied by the

-      <literal remap="tt">VScan</literal> value.

-	    </para>

-

-	    <para>

-      This function is normally called after calling

-      <function>xf86PruneDriverModes()</function>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86PrintModes(ScrnInfoPtr scrp);

-	  </programlisting>

-	  <blockquote><para>

-      This function prints out the virtual size setting, and the line

-      pitch being used.  It also prints out two lines for each mode being

-      used.  The first line includes the mode's pixel clock, horizontal sync

-      rate, refresh rate, and whether it is interlaced, doublescanned and/or

-      multi-scanned.  The second line is the mode's Modeline.

-	    </para>

-

-	    <para>

-      This function is normally called after calling

-      <function>xf86SetCrtcForModes()</function>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-    </sect2>

-

-    <sect2>

-      <title>Secondary Mode functions</title>

-

-      <para>

-The secondary mode helper functions are functions which are normally

-used by the primary mode helper functions, and which are not normally

-called directly by a driver.  If a driver has unusual requirements

-and needs to do its own mode validation, it might be able to make

-use of some of these secondary mode helper functions.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    int xf86GetNearestClock(ScrnInfoPtr scrp, int freq, Bool allowDiv2,

-                            int *divider);

-	  </programlisting>

-	  <blockquote><para>

-      This function returns the index of the closest clock to the

-      frequency <parameter>freq</parameter> given (in kHz).  It assumes that

-      the number of clocks is greater than zero.  It requires that the

-      <structfield>numClocks</structfield> and <structfield>clock</structfield> fields of the

-      <structname>ScrnInfoRec</structname> are initialised.  The

-      <structfield>allowDiv2</structfield> field determines if the clocks can be

-      halved.  The <parameter>*divider</parameter> return value indicates

-      whether clock division is used when determining the clock returned.

-	    </para>

-

-	    <para>

-      This function is only for non-programmable clocks.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    const char *xf86ModeStatusToString(ModeStatus status);

-	  </programlisting>

-	  <blockquote><para>

-      This function converts the <parameter>status</parameter> value to a

-      descriptive printable string.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    ModeStatus xf86LookupMode(ScrnInfoPtr scrp, DisplayModePtr modep,

-                     ClockRangePtr clockRanges, LookupModeFlags strategy);

-	  </programlisting>

-	  <blockquote><para>

-      This function takes a pointer to a mode with the name filled in,

-      and looks for a mode in the <structfield>modePool</structfield> list which

-      matches.  The parameters of the matching mode are filled in to

-      <parameter>*modep</parameter>.  The <parameter>clockRanges</parameter> and

-      <parameter>strategy</parameter> parameters are as for the

-      <function>xf86ValidateModes()</function> function above.

-	    </para>

-

-	    <para>

-      This function requires the <structfield>modePool</structfield>,

-      <structfield>clock[]</structfield>, <structfield>numClocks</structfield> and

-      <structfield>progClock</structfield> fields of the <structname>ScrnInfoRec</structname>

-      to be initialised before being called.

-	    </para>

-

-	    <para>

-      The return value is <constant>MODE_OK</constant> if a mode was found.

-      Otherwise it indicates why a matching mode could not be found.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    ModeStatus xf86InitialCheckModeForDriver(ScrnInfoPtr scrp,

-                                DisplayModePtr mode, ClockRangePtr clockRanges,

-                                LookupModeFlags strategy, int maxPitch,

-                                int virtualX, int virtualY);

-	  </programlisting>

-	  <blockquote><para>

-      This function checks the passed mode against some basic driver

-      constraints.  Apart from the ones passed explicitly, the

-      <structfield>maxHValue</structfield> and <structfield>maxVValue</structfield> fields of

-      the <structname>ScrnInfoRec</structname> are also used.  If the

-      <structfield>ValidMode</structfield> field of the <structname>ScrnInfoRec</structname>

-      is set, that function is also called to check the mode.  Next, the

-      mode is checked against the monitor's constraints.

-	    </para>

-

-	    <para>

-      If the mode is consistent with all constraints, the return value

-      is <constant>MODE_OK</constant>.  Otherwise the return value indicates

-      which constraint wasn't met.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86DeleteMode(DisplayModePtr *modeList, DisplayModePtr mode);

-	  </programlisting>

-	  <blockquote><para>

-      This function deletes the <parameter>mode</parameter> given from the

-      <parameter>modeList</parameter>.  It never prints any messages, so it is

-      up to the caller to print a message if required.

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Functions for handling strings and tokens</title>

-

-      <para>

-    Tables associating strings and numerical tokens combined with the

-    following functions provide a compact way of handling strings from

-    the config file, and for converting tokens into printable strings.

-    The table data structure is:

-

-	<programlisting>

-typedef struct {

-    int                 token;

-    const char *        name;

-} SymTabRec, *SymTabPtr;

-	</programlisting>

-      </para>

-

-      <para>

-    A table is an initialised array of <structname>SymTabRec</structname>.  The

-    tokens must be non-negative integers.  Multiple names may be mapped

-    to a single token.  The table is terminated with an element with a

-    <structfield>token</structfield> value of <constant>-1</constant> and

-    <constant>NULL</constant> for the <structfield>name</structfield>.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    const char *xf86TokenToString(SymTabPtr table, int token);

-	  </programlisting>

-	  <blockquote><para>

-      This function returns the first string in <parameter>table</parameter>

-      that matches <parameter>token</parameter>.  If no match is found,

-      <constant>NULL</constant> is returned (NOTE, older versions of this

-      function would return the string "unknown" when no match is found).

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    int xf86StringToToken(SymTabPtr table, const char *string);

-	  </programlisting>

-	  <blockquote><para>

-      This function returns the first token in <parameter>table</parameter>

-      that matches <parameter>string</parameter>.  The

-      <function>xf86NameCmp()</function> function is used to determine the

-      match.  If no match is found, <constant>-1</constant> is returned.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-    </sect2>

-

-    <sect2>

-      <title>Functions for finding which config file entries to use</title>

-

-      <para>

-    These functions can be used to select the appropriate config file

-    entries that match the detected hardware.  They are described above

-    in the <link linkend="probe">Probe</link> and

-    <link linkend="avail">Available Functions</link> sections.

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Probing discrete clocks on old hardware</title>

-

-      <para>

-    The <function>xf86GetClocks()</function> function may be used to assist

-    in finding the discrete pixel clock values on older hardware.

-      </para>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86GetClocks(ScrnInfoPtr pScrn, int num,

-                       Bool (*ClockFunc)(ScrnInfoPtr, int),

-                       void (*ProtectRegs)(ScrnInfoPtr, Bool),

-                       void (*BlankScreen)(ScrnInfoPtr, Bool),

-                       int vertsyncreg, int maskval, int knownclkindex,

-                       int knownclkvalue);

-	  </programlisting>

-	  <blockquote><para>

-      This function uses a comparative sampling method to measure the

-      discrete pixel clock values.  The number of discrete clocks to

-      measure is given by <parameter>num</parameter>.  <parameter>clockFunc</parameter>

-      is a function that selects the <parameter>n</parameter>'th clock.  It

-      should also save or restore any state affected by programming the

-      clocks when the index passed is <constant>CLK_REG_SAVE</constant> or

-      <constant>CLK_REG_RESTORE</constant>.  <parameter>ProtectRegs</parameter> is

-      a function that does whatever is required to protect the hardware

-      state while selecting a new clock.  <parameter>BlankScreen</parameter>

-      is a function that blanks the screen.  <parameter>vertsyncreg</parameter>

-      and <parameter>maskval</parameter> are the register and bitmask to

-      check for the presence of vertical sync pulses.

-      <parameter>knownclkindex</parameter> and <parameter>knownclkvalue</parameter>

-      are the index and value of a known clock.  These are the known

-      references on which the comparative measurements are based.  The

-      number of clocks probed is set in <structfield>pScrn-&gt;numClocks</structfield>,

-      and the probed clocks are set in the <structfield>pScrn-&gt;clock[]</structfield>

-      array.  All of the clock values are in units of kHz.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void xf86ShowClocks(ScrnInfoPtr scrp, MessageType from);

-	  </programlisting>

-	  <blockquote><para>

-      Print out the pixel clocks <parameter>scrp-&gt;clock[]</parameter>.

-      <parameter>from</parameter> indicates whether the clocks were probed

-      or from the config file.

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </sect2>

-

-    <sect2>

-      <title>Other helper functions</title>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool xf86IsUnblank(int mode);

-	  </programlisting>

-	  <blockquote><para>

-      Returns <constant>TRUE</constant> when the screen saver mode specified

-      by <parameter>mode</parameter> requires the screen be unblanked,

-      and <constant>FALSE</constant> otherwise.  The screen saver modes that

-      require blanking are <constant>SCREEN_SAVER_ON</constant> and

-      <constant>SCREEN_SAVER_CYCLE</constant>, and the screen saver modes that

-      require unblanking are <constant>SCREEN_SAVER_OFF</constant> and

-      <constant>SCREEN_SAVER_FORCER</constant>.  Drivers may call this helper

-      from their <function>SaveScreen()</function> function to interpret the

-      screen saver modes.

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </sect2>

-  </sect1>

-

-  <sect1>

-    <title>The vgahw module</title>

-

-    <para>

-The vgahw modules provides an interface for saving, restoring and

-programming the standard VGA registers, and for handling VGA colourmaps.

-    </para>

-

-    <sect2>

-      <title>Data Structures</title>

-

-      <para>

-    The public data structures used by the vgahw module are

-    <structname>vgaRegRec</structname> and <structname>vgaHWRec</structname>.  They are

-    defined in <filename>vgaHW.h.</filename>

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>General vgahw Functions</title>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool vgaHWGetHWRec(ScrnInfoPtr pScrn);

-	  </programlisting>

-	  <blockquote><para>

-      This function allocates a <structname>vgaHWRec</structname> structure, and

-      hooks it into the <structname>ScrnInfoRec</structname>'s

-      <structfield>privates</structfield>.  Like all information hooked into the

-      <structfield>privates</structfield>, it is persistent, and only needs to be

-      allocated once per screen.  This function should normally be called

-      from the driver's <function>ChipPreInit()</function> function.  The

-      <structname>vgaHWRec</structname> is zero-allocated, and the following

-      fields are explicitly initialised:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><structfield>ModeReg.DAC[]</structfield></term>

-		  <listitem><para>initialised with a default colourmap

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>ModeReg.Attribute[0x11]</structfield></term>

-		  <listitem><para>initialised with the default overscan index

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>ShowOverscan</structfield></term>

-		  <listitem><para>initialised according to the "ShowOverscan" option

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>paletteEnabled</structfield></term>

-		  <listitem><para>initialised to FALSE

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>cmapSaved</structfield></term>

-		  <listitem><para>initialised to FALSE

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><structfield>pScrn</structfield></term>

-		  <listitem><para>initialised to pScrn

-		    </para></listitem></varlistentry>

-	      </variablelist>

-	    </para>

-

-	    <para>

-      In addition to the above, <function>vgaHWSetStdFuncs()</function> is

-      called to initialise the register access function fields with the

-      standard VGA set of functions.

-	    </para>

-

-	    <para>

-      Once allocated, a pointer to the <structname>vgaHWRec</structname> can be

-      obtained from the <literal remap="tt">ScrnInfoPtr</literal> with the

-      <literal remap="tt">VGAHWPTR(pScrn)</literal> macro.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWFreeHWRec(ScrnInfoPtr pScrn);

-	  </programlisting>

-	  <blockquote><para>

-      This function frees a <structname>vgaHWRec</structname> structure.  It

-      should be called from a driver's <function>ChipFreeScreen()</function>

-      function.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool vgaHWSetRegCounts(ScrnInfoPtr pScrn, int numCRTC,

-                          int numSequencer, int numGraphics, int numAttribute);

-	  </programlisting>

-	  <blockquote><para>

-      This function allows the number of CRTC, Sequencer, Graphics and

-      Attribute registers to be changed.  This makes it possible for

-      extended registers to be saved and restored with

-      <function>vgaHWSave()</function> and <function>vgaHWRestore()</function>.

-      This function should be called after a <structname>vgaHWRec</structname>

-      has been allocated with <function>vgaHWGetHWRec()</function>.  The

-      default values are defined in <filename>vgaHW.h</filename> as follows:

-

-	      <programlisting>

-#define VGA_NUM_CRTC 25

-#define VGA_NUM_SEQ   5

-#define VGA_NUM_GFX   9

-#define VGA_NUM_ATTR 21

-	      </programlisting>

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool vgaHWCopyReg(vgaRegPtr dst, vgaRegPtr src);

-	  </programlisting>

-	  <blockquote><para>

-      This function copies the contents of the VGA saved registers in

-      <parameter>src</parameter> to <parameter>dst</parameter>.  Note that it isn't

-      possible to simply do this with <function>memcpy()</function> (or

-      similar).  This function returns <constant>TRUE</constant> unless there

-      is a problem allocating space for the <structfield>CRTC</structfield> and

-      related fields in <parameter>dst</parameter>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWSetStdFuncs(vgaHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      This function initialises the register access function fields of

-      <parameter>hwp</parameter> with the standard VGA set of functions.  This

-      is called by <function>vgaHWGetHWRec()</function>, so there is usually

-      no need to call this explicitly.  The register access functions

-      are described below.  If the registers are shadowed in some other

-      port I/O space (for example a PCI I/O region), these functions

-      can be used to access the shadowed registers if

-      <structfield>hwp-&gt;PIOOffset</structfield> is initialised with

-      <literal remap="tt">offset</literal>, calculated in such a way that when the

-      standard VGA I/O port value is added to it the correct offset into

-      the PIO area results.  This value is initialised to zero in

-      <function>vgaHWGetHWRec()</function>.  (Note: the PIOOffset functionality

-      is present in XFree86 4.1.0 and later.)

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWSetMmioFuncs(vgaHWPtr hwp, CARD8 *base, int offset);

-	  </programlisting>

-	  <blockquote><para>

-      This function initialised the register access function fields of

-      hwp with a generic MMIO set of functions.

-      <structfield>hwp-&gt;MMIOBase</structfield> is initialised with

-      <parameter>base</parameter>, which must be the virtual address that the

-      start of MMIO area is mapped to.  <structfield>hwp-&gt;MMIOOffset</structfield>

-      is initialised with <parameter>offset</parameter>, which must be calculated

-      in such a way that when the standard VGA I/O port value is added

-      to it the correct offset into the MMIO area results.  That means

-      that these functions are only suitable when the VGA I/O ports are

-      made available in a direct mapping to the MMIO space.  If that is

-      not the case, the driver will need to provide its own register

-      access functions.  The register access functions are described

-      below.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool vgaHWMapMem(ScrnInfoPtr pScrn);

-	  </programlisting>

-	  <blockquote><para>

-      This function maps the VGA memory window.  It requires that the

-      <structname>vgaHWRec</structname> be allocated.  If a driver requires

-      non-default <structfield>MapPhys</structfield> or <structfield>MapSize</structfield>

-      settings (the physical location and size of the VGA memory window)

-      then those fields of the <structname>vgaHWRec</structname> must be initialised

-      before calling this function.  Otherwise, this function initialiases

-      the default values of <constant>0xA0000</constant> for

-      <structfield>MapPhys</structfield> and <code>(64&nbsp;*&nbsp;1024)</code> for

-      <structfield>MapSize</structfield>.  This function must be called before

-      attempting to save or restore the VGA state.  If the driver doesn't

-      call it explicitly, the <function>vgaHWSave()</function> and

-      <function>vgaHWRestore()</function> functions may call it if they need

-      to access the VGA memory (in which case they will also call

-      <function>vgaHWUnmapMem()</function> to unmap the VGA memory before

-      exiting).

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWUnmapMem(ScrnInfoPtr pScrn);

-	  </programlisting>

-	  <blockquote><para>

-      This function unmaps the VGA memory window.  It must only be called

-      after the memory has been mapped.  The <structfield>Base</structfield> field

-      of the <structname>vgaHWRec</structname> field is set to <constant>NULL</constant>

-      to indicate that the memory is no longer mapped.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWGetIOBase(vgaHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      This function initialises the <structfield>IOBase</structfield> field of the

-      <structname>vgaHWRec</structname>.  This function must be called before

-      using any other functions that access the video hardware.

-	    </para>

-

-	    <para>

-      A macro <function>VGAHW_GET_IOBASE()</function> is also available in

-      <filename>vgaHW.h</filename> that returns the I/O base, and this may

-      be used when the vgahw module is not loaded (for example, in the

-      <function>ChipProbe()</function> function).

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWUnlock(vgaHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      This function unlocks the VGA <literal remap="tt">CRTC[0-7]</literal> registers,

-      and must be called before attempting to write to those registers.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWLock(vgaHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      This function locks the VGA <literal remap="tt">CRTC[0-7]</literal> registers.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWEnable(vgaHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      This function enables the VGA subsystem.  (Note, this function is

-      present in XFree86 4.1.0 and later.).

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWDisable(vgaHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      This function disables the VGA subsystem.  (Note, this function is

-      present in XFree86 4.1.0 and later.).

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWSave(ScrnInfoPtr pScrn, vgaRegPtr save, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      This function saves the VGA state.  The state is written to the

-      <structname>vgaRegRec</structname> pointed to by <parameter>save</parameter>.

-      <parameter>flags</parameter> is set to one or more of the following flags

-      ORed together:

-

-	      <variablelist>

-		<varlistentry>

-		  <term><constant>VGA_SR_MODE</constant></term>

-		  <listitem><para>the mode setting registers are saved

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>VGA_SR_FONTS</constant></term>

-		  <listitem><para>the text mode font/text data is saved

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>VGA_SR_CMAP</constant></term>

-		  <listitem><para>the colourmap (LUT) is saved

-		    </para></listitem></varlistentry>

-		<varlistentry>

-		  <term><constant>VGA_SR_ALL</constant></term>

-		  <listitem><para>all of the above are saved

-		    </para></listitem></varlistentry>

-	      </variablelist>

-	    </para>

-

-	    <para>

-      The <structname>vgaHWRec</structname> and its <structfield>IOBase</structfield> fields

-      must be initialised before this function is called.  If

-      <constant>VGA_SR_FONTS</constant> is set in <parameter>flags</parameter>, the

-      VGA memory window must be mapped.  If it isn't then

-      <function>vgaHWMapMem()</function> will be called to map it, and

-      <function>vgaHWUnmapMem()</function> will be called to unmap it

-      afterwards.  <function>vgaHWSave()</function> uses the three functions

-      below in the order <function>vgaHWSaveColormap()</function>,

-      <function>vgaHWSaveMode()</function>, <function>vgaHWSaveFonts()</function> to

-      carry out the different save phases.  It is undecided at this

-      stage whether they will remain part of the vgahw module's public

-      interface or not.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWSaveMode(ScrnInfoPtr pScrn, vgaRegPtr save);

-	  </programlisting>

-	  <blockquote><para>

-      This function saves the VGA mode registers.  They are saved to

-      the <structname>vgaRegRec</structname> pointed to by <parameter>save</parameter>.

-      The registers saved are:

-

-	      <literallayout>

-        MiscOut

-        CRTC[0-0x18]

-        Attribute[0-0x14]

-        Graphics[0-8]

-        Sequencer[0-4]

-	      </literallayout>

-	    </para>

-

-	    <para>

-    The number of registers actually saved may be modified by a prior call

-    to <function>vgaHWSetRegCounts()</function>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWSaveFonts(ScrnInfoPtr pScrn, vgaRegPtr save);

-	  </programlisting>

-	  <blockquote><para>

-      This function saves the text mode font and text data held in the

-      video memory.  If called while in a graphics mode, no save is

-      done.  The VGA memory window must be mapped with

-      <function>vgaHWMapMem()</function> before to calling this function.

-	    </para>

-

-	    <para>

-      On some platforms, one or more of the font/text plane saves may be

-      no-ops.  This is the case when the platform's VC driver already

-      takes care of this.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWSaveColormap(ScrnInfoPtr pScrn, vgaRegPtr save);

-	  </programlisting>

-	  <blockquote><para>

-      This function saves the VGA colourmap (LUT).  Before saving it, it

-      attempts to verify that the colourmap is readable.  In rare cases

-      where it isn't readable, a default colourmap is saved instead.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWRestore(ScrnInfoPtr pScrn, vgaRegPtr restore, int flags);

-	  </programlisting>

-	  <blockquote><para>

-      This function programs the VGA state.  The state programmed is

-      that contained in the <structname>vgaRegRec</structname> pointed to by

-      <parameter>restore</parameter>.  <parameter>flags</parameter> is the same

-      as described above for the <function>vgaHWSave()</function> function.

-	    </para>

-

-	    <para>

-      The <structname>vgaHWRec</structname> and its <structfield>IOBase</structfield> fields

-      must be initialised before this function is called.  If

-      <constant>VGA_SR_FONTS</constant> is set in <parameter>flags</parameter>, the

-      VGA memory window must be mapped.  If it isn't then

-      <function>vgaHWMapMem()</function> will be called to map it, and

-      <function>vgaHWUnmapMem()</function> will be called to unmap it

-      afterwards.  <function>vgaHWRestore()</function> uses the three functions

-      below in the order <function>vgaHWRestoreFonts()</function>,

-      <function>vgaHWRestoreMode()</function>,

-      <function>vgaHWRestoreColormap()</function> to carry out the different

-      restore phases.  It is undecided at this stage whether they will

-      remain part of the vgahw module's public interface or not.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWRestoreMode(ScrnInfoPtr pScrn, vgaRegPtr restore);

-	  </programlisting>

-	  <blockquote><para>

-      This function restores the VGA mode registers.  They are restored

-      from the data in the <structname>vgaRegRec</structname> pointed to by

-      <parameter>restore</parameter>.  The registers restored are:

-

-	      <literallayout>

-        MiscOut

-        CRTC[0-0x18]

-        Attribute[0-0x14]

-        Graphics[0-8]

-        Sequencer[0-4]

-	      </literallayout>

-	    </para>

-

-	    <para>

-    The number of registers actually restored may be modified by a prior call

-    to <function>vgaHWSetRegCounts()</function>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWRestoreFonts(ScrnInfoPtr pScrn, vgaRegPtr restore);

-	  </programlisting>

-	  <blockquote><para>

-      This function restores the text mode font and text data to the

-      video memory.  The VGA memory window must be mapped with

-      <function>vgaHWMapMem()</function> before to calling this function.

-	    </para>

-

-	    <para>

-      On some platforms, one or more of the font/text plane restores

-      may be no-ops.  This is the case when the platform's VC driver

-      already takes care of this.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWRestoreColormap(ScrnInfoPtr pScrn, vgaRegPtr restore);

-	  </programlisting>

-	  <blockquote><para>

-      This function restores the VGA colourmap (LUT).

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWInit(ScrnInfoPtr pScrn, DisplayModePtr mode);

-	  </programlisting>

-	  <blockquote><para>

-      This function fills in the <structname>vgaHWRec</structname>'s

-      <structfield>ModeReg</structfield> field with the values appropriate for

-      programming the given video mode.  It requires that the

-      <structname>ScrnInfoRec</structname>'s <structfield>depth</structfield> field is

-      initialised, which determines how the registers are programmed.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWSeqReset(vgaHWPtr hwp, Bool start);

-	  </programlisting>

-	  <blockquote><para>

-      Do a VGA sequencer reset.  If start is <constant>TRUE</constant>, the

-      reset is started.  If start is <constant>FALSE</constant>, the reset

-      is ended.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWProtect(ScrnInfoPtr pScrn, Bool on);

-	  </programlisting>

-	  <blockquote><para>

-      This function protects VGA registers and memory from corruption

-      during loads.  It is typically called with on set to

-      <constant>TRUE</constant> before programming, and with on set to

-      <constant>FALSE</constant> after programming.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    Bool vgaHWSaveScreen(ScreenPtr pScreen, int mode);

-	  </programlisting>

-	  <blockquote><para>

-      This function blanks and unblanks the screen.  It is blanked when

-      <parameter>mode</parameter> is <constant>SCREEN_SAVER_ON</constant> or

-      <constant>SCREEN_SAVER_CYCLE</constant>, and unblanked when

-      <parameter>mode</parameter> is <constant>SCREEN_SAVER_OFF</constant> or

-      <constant>SCREEN_SAVER_FORCER</constant>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void vgaHWBlankScreen(ScrnInfoPtr pScrn, Bool on);

-	  </programlisting>

-	  <blockquote><para>

-      This function blanks and unblanks the screen.  It is blanked when

-      <parameter>on</parameter> is <constant>FALSE</constant>, and unblanked when

-      <parameter>on</parameter> is <constant>TRUE</constant>.  This function is

-      provided for use in cases where the <structname>ScrnInfoRec</structname>

-      can't be derived from the <structname>ScreenRec</structname> (while probing

-      for clocks, for example).

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-    </sect2>

-

-    <sect2>

-      <title>VGA Colormap Functions</title>

-

-      <para>

-    The vgahw module uses the standard colormap support (see the

-    <link linkend="cmap">Colormap Handling</link> section.  This is initialised

-    with the following function:

-

-	<blockquote><para>

-	  <programlisting>

-    Bool vgaHWHandleColormaps(ScreenPtr pScreen);

-	    </programlisting>

-	  </para></blockquote>

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>VGA Register Access Functions</title>

-

-      <para>

-    The vgahw module abstracts access to the standard VGA registers by

-    using a set of functions held in the <structname>vgaHWRec</structname>.  When

-    the <structname>vgaHWRec</structname> is created these function pointers are

-    initialised with the set of standard VGA I/O register access functions.

-    In addition to these, the vgahw module includes a basic set of MMIO

-    register access functions, and the <structname>vgaHWRec</structname> function

-    pointers can be initialised to these by calling the

-    <function>vgaHWSetMmioFuncs()</function> function described above.  Some

-    drivers/platforms may require a different set of functions for VGA

-    access.  The access functions are described here.

-      </para>

-

-

-      <blockquote><para>

-	  <programlisting>

-    void writeCrtc(vgaHWPtr hwp, CARD8 index, CARD8 value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to CRTC register <parameter>index</parameter>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    CARD8 readCrtc(vgaHWPtr hwp, CARD8 index);

-	  </programlisting>

-	  <blockquote><para>

-      Return the value read from CRTC register <parameter>index</parameter>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeGr(vgaHWPtr hwp, CARD8 index, CARD8 value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to Graphics Controller register

-      <parameter>index</parameter>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    CARD8 readGR(vgaHWPtr hwp, CARD8 index);

-	  </programlisting>

-	  <blockquote><para>

-      Return the value read from Graphics Controller register

-      <parameter>index</parameter>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeSeq(vgaHWPtr hwp, CARD8 index, CARD8, value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to Sequencer register

-      <parameter>index</parameter>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    CARD8 readSeq(vgaHWPtr hwp, CARD8 index);

-	  </programlisting>

-	  <blockquote><para>

-      Return the value read from Sequencer register <parameter>index</parameter>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeAttr(vgaHWPtr hwp, CARD8 index, CARD8, value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to Attribute Controller register

-      <parameter>index</parameter>.  When writing out the index value this

-      function should set bit 5 (<constant>0x20</constant>) according to the

-      setting of <structfield>hwp-&gt;paletteEnabled</structfield> in order to

-      preserve the palette access state.  It should be cleared when

-      <structfield>hwp-&gt;paletteEnabled</structfield> is <constant>TRUE</constant>

-      and set when it is <constant>FALSE</constant>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    CARD8 readAttr(vgaHWPtr hwp, CARD8 index);

-	  </programlisting>

-	  <blockquote><para>

-      Return the value read from Attribute Controller register

-      <parameter>index</parameter>.  When writing out the index value this

-      function should set bit 5 (<constant>0x20</constant>) according to the

-      setting of <structfield>hwp-&gt;paletteEnabled</structfield> in order to

-      preserve the palette access state.  It should be cleared when

-      <structfield>hwp-&gt;paletteEnabled</structfield> is <constant>TRUE</constant>

-      and set when it is <constant>FALSE</constant>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeMiscOut(vgaHWPtr hwp, CARD8 value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <quote><parameter>value</parameter></quote> to the Miscellaneous Output register.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    CARD8 readMiscOut(vgwHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      Return the value read from the Miscellaneous Output register.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void enablePalette(vgaHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      Clear the palette address source bit in the Attribute Controller

-      index register and set <literal remap="tt">hwp-&gt;paletteEnabled</literal> to

-      <constant>TRUE</constant>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void disablePalette(vgaHWPtr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      Set the palette address source bit in the Attribute Controller

-      index register and set <literal remap="tt">hwp-&gt;paletteEnabled</literal> to

-      <constant>FALSE</constant>.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeDacMask(vgaHWPtr hwp, CARD8 value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to the DAC Mask register.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    CARD8 readDacMask(vgaHWptr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      Return the value read from the DAC Mask register.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeDacReadAddress(vgaHWPtr hwp, CARD8 value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to the DAC Read Address register.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeDacWriteAddress(vgaHWPtr hwp, CARD8 value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to the DAC Write Address register.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeDacData(vgaHWPtr hwp, CARD8 value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to the DAC Data register.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    CARD8 readDacData(vgaHWptr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      Return the value read from the DAC Data register.

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    CARD8 readEnable(vgaHWptr hwp);

-	  </programlisting>

-	  <blockquote><para>

-      Return the value read from the VGA Enable register.  (Note: This

-      function is present in XFree86 4.1.0 and later.)

-	    </para>

-

-	  </blockquote></para></blockquote>

-

-      <blockquote><para>

-	  <programlisting>

-    void writeEnable(vgaHWPtr hwp, CARD8 value);

-	  </programlisting>

-	  <blockquote><para>

-      Write <parameter>value</parameter> to the VGA Enable register.  (Note: This

-      function is present in XFree86 4.1.0 and later.)

-	    </para>

-

-	  </blockquote></para></blockquote>

-    </sect2>

-  </sect1>

-

-  <sect1 id="sample">

-    <title>Some notes about writing a driver</title>

-

-    <note><para>NOTE: some parts of this are not up to date</para></note>

-

-    <para>

-The following is an outline for writing a basic unaccelerated driver

-for a PCI video card with a linear mapped framebuffer, and which has a

-VGA core.  It is includes some general information that is relevant to

-most drivers (even those which don't fit that basic description).

-    </para>

-

-    <para>

-The information here is based on the initial conversion of the Matrox

-Millennium driver to the <quote>new design</quote>.  For a fleshing out and sample

-implementation of some of the bits outlined here, refer to that driver.

-Note that this is an example only.  The approach used here will not be

-appropriate for all drivers.

-    </para>

-

-    <para>

-Each driver must reserve a unique driver name, and a string that is used

-to prefix all of its externally visible symbols.  This is to avoid name

-space clashes when loading multiple drivers.  The examples here are for

-the <quote>ZZZ</quote> driver, which uses the <quote>ZZZ</quote> or <quote>zzz</quote> prefix for its externally

-visible symbols.

-    </para>

-

-    <sect2>

-      <title>Include files</title>

-

-      <para>

-  All drivers normally include the following headers:

-	<literallayout><filename>

-    "xf86.h"

-    "xf86_OSproc.h"

-    "xf86_ansic.h"

-    "xf86Resources.h"

-	  </filename></literallayout>

-  Wherever inb/outb (and related things) are used the following should be

-  included:

-	<literallayout><filename>

-    "compiler.h"

-	  </filename></literallayout>

-  Note: in drivers, this must be included after <filename>"xf86_ansic.h"</filename>.

-      </para>

-

-      <para>

-  Drivers that need to access PCI vendor/device definitions need this:

-	<literallayout><filename>

-    "xf86PciInfo.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  Drivers that need to access the PCI config space need this:

-	<literallayout><filename>

-    "xf86Pci.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  Drivers using the mi banking wrapper need:

-

-	<literallayout><filename>

-    "mibank.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  Drivers that initialise a SW cursor need this:

-	<literallayout><filename>

-    "mipointer.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  All drivers implementing backing store need this:

-	<literallayout><filename>

-    "mibstore.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  All drivers using the mi colourmap code need this:

-	<literallayout><filename>

-    "micmap.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  If a driver uses the vgahw module, it needs this:

-	<literallayout><filename>

-    "vgaHW.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  Drivers supporting VGA or Hercules monochrome screens need:

-	<literallayout><filename>

-    "xf1bpp.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  Drivers supporting VGA or EGC 16-colour screens need:

-	<literallayout><filename>

-    "xf4bpp.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  Drivers using cfb need:

-	<programlisting>

-    #define PSZ 8

-    #include "cfb.h"

-    #undef PSZ

-	</programlisting>

-      </para>

-

-      <para>

-  Drivers supporting bpp 16, 24 or 32 with cfb need one or more of:

-	<literallayout><filename>

-    "cfb16.h"

-    "cfb24.h"

-    "cfb32.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  The driver's own header file:

-	<literallayout><filename>

-    "zzz.h"

-	  </filename></literallayout>

-      </para>

-

-      <para>

-  Drivers must NOT include the following:

-

-	<literallayout><filename>

-    "xf86Priv.h"

-    "xf86Privstr.h"

-    "xf86_libc.h"

-    "xf86_OSlib.h"

-    "Xos.h"</filename>

-    any OS header

-	</literallayout>

-      </para>

-

-    </sect2>

-

-    <sect2>

-      <title>Data structures and initialisation</title>

-

-      <itemizedlist>

-	<listitem>

-	  <para>The following macros should be defined:

-	    <programlisting>

-#define VERSION &lt;version-as-an-int&gt;

-#define ZZZ_NAME "ZZZ"         /* the name used to prefix messages */

-#define ZZZ_DRIVER_NAME "zzz"  /* the driver name as used in config file */

-#define ZZZ_MAJOR_VERSION &lt;int&gt;

-#define ZZZ_MINOR_VERSION &lt;int&gt;

-#define ZZZ_PATCHLEVEL    &lt;int&gt;

-	    </programlisting>

-	  </para>

-	  <para>

-    NOTE: <constant>ZZZ_DRIVER_NAME</constant> should match the name of the

-    driver module without things like the "lib" prefix, the "_drv" suffix

-    or filename extensions.

-	  </para>

-	</listitem>

-

-	<listitem>

-	  <para>

-    A DriverRec must be defined, which includes the functions required

-    at the pre-probe phase.  The name of this DriverRec must be an

-    upper-case version of ZZZ_DRIVER_NAME (for the purposes of static

-    linking).

-	    <programlisting>

-DriverRec ZZZ = {

-    VERSION,

-    ZZZ_DRIVER_NAME,

-    ZZZIdentify,

-    ZZZProbe,

-    ZZZAvailableOptions,

-    NULL,

-    0

-};

-	    </programlisting>

-	  </para>

-	</listitem>

-

-	<listitem>

-	  <para>Define list of supported chips and their matching ID:

-	    <programlisting>

-static SymTabRec ZZZChipsets[] = {

-    { PCI_CHIP_ZZZ1234, "zzz1234a" },

-    { PCI_CHIP_ZZZ5678, "zzz5678a" },

-    { -1,               NULL }

-};

-	    </programlisting>

-	  </para>

-	  <para>

-    The token field may be any integer value that the driver may use to

-    uniquely identify the supported chipsets.  For drivers that support

-    only PCI devices using the PCI device IDs might be a natural choice,

-    but this isn't mandatory.  For drivers that support both PCI and other

-    devices (like ISA), some other ID should probably used.  When other

-    IDs are used as the tokens it is recommended that the names be

-    defined as an <type>enum</type> type.

-	  </para>

-	</listitem>

-

-	<listitem>

-	  <para>

-    If the driver uses the <function>xf86MatchPciInstances()</function>

-    helper (recommended for drivers that support PCI cards) a list that

-    maps PCI IDs to chip IDs and fixed resources must be defined:

-	    <programlisting>

-static PciChipsets ZZZPciChipsets[] = {

-    { PCI_CHIP_ZZZ1234, PCI_CHIP_ZZZ1234, RES_SHARED_VGA },

-    { PCI_CHIP_ZZZ5678, PCI_CHIP_ZZZ5678, RES_SHARED_VGA },

-    { -1,               -1,               RES_UNDEFINED }

-}

-	    </programlisting>

-	  </para>

-	</listitem>

-

-	<listitem>

-	  <para>

-    Define the <structname>XF86ModuleVersionInfo</structname> struct for the

-    driver.  This is required for the dynamically loaded version:

-	    <programlisting>

-static XF86ModuleVersionInfo zzzVersRec =

-{

-    "zzz",

-    MODULEVENDORSTRING,

-    MODINFOSTRING1,

-    MODINFOSTRING2,

-    XF86_VERSION_CURRENT,

-    ZZZ_MAJOR_VERSION, ZZZ_MINOR_VERSION, ZZZ_PATCHLEVEL,

-    ABI_CLASS_VIDEODRV,

-    ABI_VIDEODRV_VERSION,

-    MOD_CLASS_VIDEODRV,

-    {0,0,0,0}

-};

-	    </programlisting>

-	  </para>

-	</listitem>

-

-	<listitem>

-	  <para>

-    Define a data structure to hold the driver's screen-specific data.

-    This must be used instead of global variables.  This would be defined

-    in the <filename>"zzz.h"</filename> file, something like:

-	    <programlisting>

-typedef struct {

-    type1  field1;

-    type2  field2;

-    int    fooHack;

-    Bool   pciRetry;

-    Bool   noAccel;

-    Bool   hwCursor;

-    CloseScreenProcPtr CloseScreen;

-    OptionInfoPtr Options;

-    ...

-} ZZZRec, *ZZZPtr;

-	    </programlisting>

-	  </para>

-	</listitem>

-

-	<listitem>

-	  <para>

-    Define the list of config file Options that the driver accepts.  For

-    consistency between drivers those in the list of <quote>standard</quote> options

-    should be used where appropriate before inventing new options.

-

-	    <programlisting>

-typedef enum {

-    OPTION_FOO_HACK,

-    OPTION_PCI_RETRY,

-    OPTION_HW_CURSOR,

-    OPTION_NOACCEL

-} ZZZOpts;

-

-static const OptionInfoRec ZZZOptions[] = {

-  { OPTION_FOO_HACK,  "FooHack",   OPTV_INTEGER, {0}, FALSE },

-  { OPTION_PCI_RETRY, "PciRetry",  OPTV_BOOLEAN, {0}, FALSE },

-  { OPTION_HW_CURSOR, "HWcursor",  OPTV_BOOLEAN, {0}, FALSE },

-  { OPTION_NOACCEL,   "NoAccel",   OPTV_BOOLEAN, {0}, FALSE },

-  { -1,               NULL,        OPTV_NONE,    {0}, FALSE }

-};

-	    </programlisting>

-	  </para>

-	</listitem>

-      </itemizedlist>

-    </sect2>

-

-    <sect2>

-      <title>Functions</title>

-

-

-      <sect3>

-	<title>SetupProc</title>

-

-	<para>

-    For dynamically loaded modules, a <varname>ModuleData</varname>

-    variable is required.  It is should be the name of the driver

-    prepended to "ModuleData".  A <function>Setup()</function> function is

-    also required, which calls <function>xf86AddDriver()</function> to add

-    the driver to the main list of drivers.

-	</para>

-

-	<programlisting>

-static MODULESETUPPROTO(zzzSetup);

-

-XF86ModuleData zzzModuleData = { &amp;zzzVersRec, zzzSetup, NULL };

-

-static pointer

-zzzSetup(pointer module, pointer opts, int *errmaj, int *errmin)

-{

-    static Bool setupDone = FALSE;

-

-    /* This module should be loaded only once, but check to be sure. */

-

-    if (!setupDone) {

-        /*

-         * Modules that this driver always requires may be loaded

-         * here  by calling LoadSubModule().

-         */

-

-        setupDone = TRUE;

-        xf86AddDriver(&amp;MGA, module, 0);

-

-        /*

-         * The return value must be non-NULL on success even though

-         * there is no TearDownProc.

-         */

-        return (pointer)1;

-    } else {

-        if (errmaj) *errmaj = LDR_ONCEONLY;

-        return NULL;

-    }

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>GetRec, FreeRec</title>

-

-	<para>

-    A function is usually required to allocate the driver's

-    screen-specific data structure and hook it into the

-    <structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield> field.

-    The <structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield> is

-    initialised to <constant>NULL</constant>, so it is easy to check if the

-    initialisation has already been done.  After allocating it, initialise

-    the fields.  By using <function>xnfcalloc()</function> to do the allocation

-    it is zeroed, and if the allocation fails the server exits.

-	</para>

-

-	<para>

-    NOTE:

-    When allocating structures from inside the driver which are defined

-    on the common level it is important to initialize the structure to

-    zero.

-    Only this guarantees that the server remains source compatible to

-    future changes in common level structures.

-	</para>

-

-	<programlisting>

-static Bool

-ZZZGetRec(ScrnInfoPtr pScrn)

-{

-    if (pScrn-&gt;driverPrivate != NULL)

-        return TRUE;

-    pScrn-&gt;driverPrivate = xnfcalloc(sizeof(ZZZRec), 1);

-    /* Initialise as required */

-    ...

-    return TRUE;

-}

-	</programlisting>

-

-	<para>

-    Define a macro in <filename>"zzz.h"</filename> which gets a pointer to

-    the <structname>ZZZRec</structname> when given <parameter>pScrn</parameter>:

-

-	  <programlisting>

-#define ZZZPTR(p) ((ZZZPtr)((p)-&gt;driverPrivate))

-	  </programlisting>

-	</para>

-

-	<para>

-    Define a function to free the above, setting it to <constant>NULL</constant>

-    once it has been freed:

-

-	  <programlisting>

-static void

-ZZZFreeRec(ScrnInfoPtr pScrn)

-{

-    if (pScrn-&gt;driverPrivate == NULL)

-        return;

-    xfree(pScrn-&gt;driverPrivate);

-    pScrn-&gt;driverPrivate = NULL;

-}

-	  </programlisting>

-	</para>

-      </sect3>

-

-      <sect3>

-	<title>Identify</title>

-

-	<para>

-    Define the <function>Identify()</function> function.  It is run before

-    the Probe, and typically prints out an identifying message, which

-    might include the chipsets it supports.  This function is mandatory:

-

-	  <programlisting>

-static void

-ZZZIdentify(int flags)

-{

-    xf86PrintChipsets(ZZZ_NAME, "driver for ZZZ Tech chipsets",

-                      ZZZChipsets);

-}

-	  </programlisting>

-	</para>

-      </sect3>

-

-      <sect3>

-	<title>Probe</title>

-

-	<para>

-    Define the <function>Probe()</function> function.  The purpose of this

-    is to find all instances of the hardware that the driver supports,

-    and for the ones not already claimed by another driver, claim the

-    slot, and allocate a <structname>ScrnInfoRec</structname>.  This should be

-    a minimal probe, and it should under no circumstances leave the

-    state of the hardware changed.  Because a device is found, don't

-    assume that it will be used.  Don't do any initialisations other

-    than the required <structname>ScrnInfoRec</structname> initialisations.

-    Don't allocate any new data structures.

-	</para>

-

-	<para>

-    This function is mandatory.

-	</para>

-

-	<para>

-    NOTE: The <function>xf86DrvMsg()</function> functions cannot be used from

-    the Probe.

-	</para>

-

-	<programlisting>

-static Bool

-ZZZProbe(DriverPtr drv, int flags)

-{

-    Bool foundScreen = FALSE;

-    int numDevSections, numUsed;

-    GDevPtr *devSections;

-    int *usedChips;

-    int i;

-

-    /*

-     * Find the config file Device sections that match this

-     * driver, and return if there are none.

-     */

-    if ((numDevSections = xf86MatchDevice(ZZZ_DRIVER_NAME,

-                                          &amp;devSections)) &lt;= 0) {

-        return FALSE;

-    }

-

-    /*

-     * Since this is a PCI card, "probing" just amounts to checking

-     * the PCI data that the server has already collected.  If there

-     * is none, return.

-     *

-     * Although the config file is allowed to override things, it

-     * is reasonable to not allow it to override the detection

-     * of no PCI video cards.

-     *

-     * The provided xf86MatchPciInstances() helper takes care of

-     * the details.

-     */

-    /* test if PCI bus present */

-    if (xf86GetPciVideoInfo()) {

-

-        numUsed = xf86MatchPciInstances(ZZZ_NAME, PCI_VENDOR_ZZZ,

-                            ZZZChipsets, ZZZPciChipsets, devSections,

-                            numDevSections, drv, &amp;usedChips);

-

-        for (i = 0; i &lt; numUsed; i++) {

-            ScrnInfoPtr pScrn = NULL;

-            if ((pScrn = xf86ConfigPciEntity(pScrn, flags, usedChips[i],

-                                             ZZZPciChipsets, NULL, NULL,

-                                             NULL, NULL, NULL))) {

-               /* Allocate a ScrnInfoRec */

-               pScrn-&gt;driverVersion = VERSION;

-               pScrn-&gt;driverName    = ZZZ_DRIVER_NAME;

-               pScrn-&gt;name          = ZZZ_NAME;

-               pScrn-&gt;Probe         = ZZZProbe;

-               pScrn-&gt;PreInit       = ZZZPreInit;

-               pScrn-&gt;ScreenInit    = ZZZScreenInit;

-               pScrn-&gt;SwitchMode    = ZZZSwitchMode;

-               pScrn-&gt;AdjustFrame   = ZZZAdjustFrame;

-               pScrn-&gt;EnterVT       = ZZZEnterVT;

-               pScrn-&gt;LeaveVT       = ZZZLeaveVT;

-               pScrn-&gt;FreeScreen    = ZZZFreeScreen;

-               pScrn-&gt;ValidMode     = ZZZValidMode;

-               foundScreen = TRUE;

-               /* add screen to entity */

-           }

-        }

-        xfree(usedChips);

-    }

-

-#ifdef HAS_ISA_DEVS

-    /*

-     * If the driver supports ISA hardware, the following block

-     * can be included too.

-     */

-    numUsed = xf86MatchIsaInstances(ZZZ_NAME, ZZZChipsets,

-                             ZZZIsaChipsets, drv, ZZZFindIsaDevice,

-                             devSections, numDevSections, &amp;usedChips);

-    for (i = 0; i &lt; numUsed; i++) {

-        ScrnInfoPtr pScrn = NULL;

-	if ((pScrn = xf86ConfigIsaEntity(pScrn, flags, usedChips[i],

-					 ZZZIsaChipsets, NULL, NULL, NULL,

-					 NULL, NULL))) {

-            pScrn-&gt;driverVersion = VERSION;

-            pScrn-&gt;driverName    = ZZZ_DRIVER_NAME;

-            pScrn-&gt;name          = ZZZ_NAME;

-            pScrn-&gt;Probe         = ZZZProbe;

-            pScrn-&gt;PreInit       = ZZZPreInit;

-            pScrn-&gt;ScreenInit    = ZZZScreenInit;

-            pScrn-&gt;SwitchMode    = ZZZSwitchMode;

-            pScrn-&gt;AdjustFrame   = ZZZAdjustFrame;

-            pScrn-&gt;EnterVT       = ZZZEnterVT;

-            pScrn-&gt;LeaveVT       = ZZZLeaveVT;

-            pScrn-&gt;FreeScreen    = ZZZFreeScreen;

-            pScrn-&gt;ValidMode     = ZZZValidMode;

-            foundScreen = TRUE;

-        }

-    }

-    xfree(usedChips);

-#endif /* HAS_ISA_DEVS */

-

-    xfree(devSections);

-    return foundScreen;

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>AvailableOptions</title>

-

-	<para>

-    Define the <function>AvailableOptions()</function> function. The purpose

-    of this is to return the available driver options back to the

-    -configure option, so that an xorg.conf file can be built and the

-    user can see which options are available for them to use.

-	</para>

-      </sect3>

-

-      <sect3>

-	<title>PreInit</title>

-

-	<para>

-    Define the <function>PreInit()</function> function.  The purpose of

-    this is to find all the information required to determine if the

-    configuration is usable, and to initialise those parts of the

-    <structname>ScrnInfoRec</structname> that can be set once at the beginning

-    of the first server generation.  The information should be found in

-    the least intrusive way possible.

-	</para>

-

-	<para>

-    This function is mandatory.

-	</para>

-

-	<para>

-    NOTES:

-	  <orderedlist>

-	    <listitem><para>

-	 The <function>PreInit()</function> function is only called once

-	 during the life of the X server (at the start of the first

-	 generation).

-	      </para></listitem>

-

-	    <listitem><para>

-	 Data allocated here must be of the type that persists for

-	 the life of the X server.  This means that data that hooks into

-	 the <structname>ScrnInfoRec</structname>'s <structfield>privates</structfield>

-	 field should be allocated here, but data that hooks into the

-	 <structname>ScreenRec</structname>'s <structfield>devPrivates</structfield> field

-	 should not be allocated here.  The <structfield>driverPrivate</structfield>

-	 field should also be allocated here.

-	      </para></listitem>

-

-	    <listitem><para>

-	 Although the <structname>ScrnInfoRec</structname> has been allocated

-	 before this function is called, the <structname>ScreenRec</structname>

-	 has not been allocated.  That means that things requiring it

-	 cannot be used in this function.

-	      </para></listitem>

-

-	    <listitem><para>

-	 Very little of the <structname>ScrnInfoRec</structname> has been

-	 initialised when this function is called.  It is important to

-	 get the order of doing things right in this function.

-	      </para></listitem>

-

-	  </orderedlist>

-	</para>

-

-	<programlisting>

-static Bool

-ZZZPreInit(ScrnInfoPtr pScrn, int flags)

-{

-    /* Fill in the monitor field */

-    pScrn-&gt;monitor = pScrn-&gt;confScreen-&gt;monitor;

-

-    /*

-     * If using the vgahw module, it will typically be loaded

-     * here by calling xf86LoadSubModule(pScrn, "vgahw");

-     */

-

-    /*

-     * Set the depth/bpp.  Use the globally preferred depth/bpp.  If the

-     * driver has special default depth/bpp requirements, the defaults should

-     * be specified here explicitly.

-     * We support both 24bpp and 32bpp framebuffer layouts.

-     * This sets pScrn-&gt;display also.

-     */

-    if (!xf86SetDepthBpp(pScrn, 0, 0, 0,

-                         Support24bppFb | Support32bppFb)) {

-        return FALSE;

-    } else {

-        if (depth/bpp isn't one we support) {

-            print error message;

-            return FALSE;

-        }

-    }

-    /* Print out the depth/bpp that was set */

-    xf86PrintDepthBpp(pScrn);

-

-    /* Set bits per RGB for 8bpp */

-    if (pScrn-&gt;depth &lt;= 8) {

-        /* Take into account a dac_6_bit option here */

-        pScrn-&gt;rgbBits = 6 or 8;

-    }

-

-    /*

-     * xf86SetWeight() and xf86SetDefaultVisual() must be called

-     * after pScrn-&gt;display is initialised.

-     */

-

-    /* Set weight/mask/offset for depth &gt; 8 */

-    if (pScrn-&gt;depth &gt; 8) {

-        if (!xf86SetWeight(pScrn, defaultWeight, defaultMask)) {

-            return FALSE;

-        } else {

-            if (weight isn't one we support) {

-                print error message;

-                return FALSE;

-            }

-        }

-    }

-

-    /* Set the default visual. */

-    if (!xf86SetDefaultVisual(pScrn, -1)) {

-        return FALSE;

-    } else {

-        if (visual isn't one we support) {

-            print error message;

-            return FALSE;

-        }

-    }

-

-    /* If the driver supports gamma correction, set the gamma. */

-    if (!xf86SetGamma(pScrn, default_gamma)) {

-        return FALSE;

-    }

-

-    /* This driver uses a programmable clock */

-    pScrn-&gt;progClock = TRUE;

-

-    /* Allocate the ZZZRec driverPrivate */

-    if (!ZZZGetRec(pScrn)) {

-        return FALSE;

-    }

-

-    pZzz = ZZZPTR(pScrn);

-

-    /* Collect all of the option flags (fill in pScrn-&gt;options) */

-    xf86CollectOptions(pScrn, NULL);

-

-    /*

-     * Process the options based on the information in ZZZOptions.

-     * The results are written to pZzz-&gt;Options.  If all of the options

-     * processing is done within this function a local variable "options"

-     * can be used instead of pZzz-&gt;Options.

-     */

-    if (!(pZzz-&gt;Options = xalloc(sizeof(ZZZOptions))))

-        return FALSE;

-    (void)memcpy(pZzz-&gt;Options, ZZZOptions, sizeof(ZZZOptions));

-    xf86ProcessOptions(pScrn-&gt;scrnIndex, pScrn-&gt;options, pZzz-&gt;Options);

-

-    /*

-     * Set various fields of ScrnInfoRec and/or ZZZRec based on

-     * the options found.

-     */

-    from = X_DEFAULT;

-    pZzz-&gt;hwCursor = FALSE;

-    if (xf86IsOptionSet(pZzz-&gt;Options, OPTION_HW_CURSOR)) {

-        from = X_CONFIG;

-        pZzz-&gt;hwCursor = TRUE;

-    }

-    xf86DrvMsg(pScrn-&gt;scrnIndex, from, "Using %s cursor\n",

-               pZzz-&gt;hwCursor ? "HW" : "SW");

-    if (xf86IsOptionSet(pZzz-&gt;Options, OPTION_NOACCEL)) {

-        pZzz-&gt;noAccel = TRUE;

-        xf86DrvMsg(pScrn-&gt;scrnIndex, X_CONFIG,

-                   "Acceleration disabled\n");

-    } else {

-        pZzz-&gt;noAccel = FALSE;

-    }

-    if (xf86IsOptionSet(pZzz-&gt;Options, OPTION_PCI_RETRY)) {

-        pZzz-&gt;UsePCIRetry = TRUE;

-        xf86DrvMsg(pScrn-&gt;scrnIndex, X_CONFIG, "PCI retry enabled\n");

-    }

-    pZzz-&gt;fooHack = 0;

-    if (xf86GetOptValInteger(pZzz-&gt;Options, OPTION_FOO_HACK,

-                             &amp;pZzz-&gt;fooHack)) {

-        xf86DrvMsg(pScrn-&gt;scrnIndex, X_CONFIG, "Foo Hack set to %d\n",

-                   pZzz-&gt;fooHack);

-    }

-

-    /*

-     * Find the PCI slot(s) that this screen claimed in the probe.

-     * In this case, exactly one is expected, so complain otherwise.

-     * Note in this case we're not interested in the card types so

-     * that parameter is set to NULL.

-     */

-    if ((i = xf86GetPciInfoForScreen(pScrn-&gt;scrnIndex, &amp;pciList, NULL))

-        != 1) {

-        print error message;

-        ZZZFreeRec(pScrn);

-        if (i &gt; 0)

-            xfree(pciList);

-        return FALSE;

-    }

-    /* Note that pciList should be freed below when no longer needed */

-

-    /*

-     * Determine the chipset, allowing config file chipset and

-     * chipid values to override the probed information.  The config

-     * chipset value has precedence over its chipid value if both

-     * are present.

-     *

-     * It isn't necessary to fill in pScrn-&gt;chipset if the driver

-     * keeps track of the chipset in its ZZZRec.

-     */

-

-    ...

-

-    /*

-     * Determine video memory, fb base address, I/O addresses, etc,

-     * allowing the config file to override probed values.

-     *

-     * Set the appropriate pScrn fields (videoRam is probably the

-     * most important one that other code might require), and

-     * print out the settings.

-     */

-

-    ...

-

-    /* Initialise a clockRanges list. */

-

-    ...

-

-    /* Set any other chipset specific things in the ZZZRec */

-

-    ...

-

-    /* Select valid modes from those available */

-

-    i = xf86ValidateModes(pScrn, pScrn-&gt;monitor-&gt;Modes,

-                          pScrn-&gt;display-&gt;modes, clockRanges,

-                          NULL, minPitch, maxPitch, rounding,

-                          minHeight, maxHeight,

-                          pScrn-&gt;display-&gt;virtualX,

-                          pScrn-&gt;display-&gt;virtualY,

-                          pScrn-&gt;videoRam * 1024,

-                          LOOKUP_BEST_REFRESH);

-    if (i == -1) {

-        ZZZFreeRec(pScrn);

-        return FALSE;

-    }

-

-    /* Prune the modes marked as invalid */

-

-    xf86PruneDriverModes(pScrn);

-

-    /* If no valid modes, return */

-

-    if (i == 0 || pScrn-&gt;modes == NULL) {

-        print error message;

-        ZZZFreeRec(pScrn);

-        return FALSE;

-    }

-

-    /*

-     * Initialise the CRTC fields for the modes.  This driver expects

-     * vertical values to be halved for interlaced modes.

-     */

-    xf86SetCrtcForModes(pScrn, INTERLACE_HALVE_V);

-

-    /* Set the current mode to the first in the list. */

-    pScrn-&gt;currentMode = pScrn-&gt;modes;

-

-    /* Print the list of modes being used. */

-    xf86PrintModes(pScrn);

-

-    /* Set the DPI */

-    xf86SetDpi(pScrn, 0, 0);

-

-    /* Load bpp-specific modules */

-    switch (pScrn-&gt;bitsPerPixel) {

-    case 1:

-        mod = "xf1bpp";

-        break;

-    case 4:

-        mod = "xf4bpp";

-        break;

-    case 8:

-        mod = "cfb";

-        break;

-    case 16:

-        mod = "cfb16";

-        break;

-    case 24:

-        mod = "cfb24";

-        break;

-    case 32:

-        mod = "cfb32";

-        break;

-    }

-    if (mod &amp;&amp; !xf86LoadSubModule(pScrn, mod))

-        ZZZFreeRec(pScrn);

-        return FALSE;

-

-    /* Load XAA if needed */

-    if (!pZzz-&gt;noAccel || pZzz-&gt;hwCursor)

-        if (!xf86LoadSubModule(pScrn, "xaa")) {

-            ZZZFreeRec(pScrn);

-            return FALSE;

-        }

-

-    /* Done */

-    return TRUE;

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>MapMem, UnmapMem</title>

-

-	<para>

-    Define functions to map and unmap the video memory and any other

-    memory apertures required.  These functions are not mandatory, but

-    it is often useful to have such functions.

-	</para>

-

-	<programlisting>

-static Bool

-ZZZMapMem(ScrnInfoPtr pScrn)

-{

-    /* Call xf86MapPciMem() to map each PCI memory area */

-    ...

-    return TRUE or FALSE;

-}

-

-static Bool

-ZZZUnmapMem(ScrnInfoPtr pScrn)

-{

-    /* Call xf86UnMapVidMem() to unmap each memory area */

-    ...

-    return TRUE or FALSE;

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>Save, Restore</title>

-

-	<para>

-    Define functions to save and restore the original video state.  These

-    functions are not mandatory, but are often useful.

-	</para>

-

-	<programlisting>

-static void

-ZZZSave(ScrnInfoPtr pScrn)

-{

-    /*

-     * Save state into per-screen data structures.

-     * If using the vgahw module, vgaHWSave will typically be

-     * called here.

-     */

-    ...

-}

-

-static void

-ZZZRestore(ScrnInfoPtr pScrn)

-{

-    /*

-     * Restore state from per-screen data structures.

-     * If using the vgahw module, vgaHWRestore will typically be

-     * called here.

-     */

-    ...

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>ModeInit</title>

-

-	<para>

-    Define a function to initialise a new video mode.  This function isn't

-    mandatory, but is often useful.

-	</para>

-

-	<programlisting>

-static Bool

-ZZZModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode)

-{

-    /*

-     * Program a video mode.  If using the vgahw module,

-     * vgaHWInit and vgaRestore will typically be called here.

-     * Once up to the point where there can't be a failure

-     * set pScrn-&gt;vtSema to TRUE.

-     */

-    ...

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>ScreenInit</title>

-

-	<para>

-    Define the <function>ScreenInit()</function> function.  This is called

-    at the start of each server generation, and should fill in as much

-    of the <structname>ScreenRec</structname> as possible as well as any other

-    data that is initialised once per generation.  It should initialise

-    the framebuffer layers it is using, and initialise the initial video

-    mode.

-	</para>

-

-	<para>

-    This function is mandatory.

-	</para>

-

-	<para>

-    NOTE: The <structname>ScreenRec</structname> (<parameter>pScreen</parameter>) is

-	  passed to this driver, but it and the

-	  <varname>ScrnInfoRecs</varname> are not yet hooked into each

-	  other.  This means that in this function, and functions it

-	  calls, one cannot be found from the other.

-	</para>

-

-	<programlisting>

-static Bool

-ZZZScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)

-{

-    /* Get the ScrnInfoRec */

-    pScrn = xf86Screens[pScreen-&gt;myNum];

-

-    /*

-     * If using the vgahw module, its data structures and related

-     * things are typically initialised/mapped here.

-     */

-

-    /* Save the current video state */

-    ZZZSave(pScrn);

-

-    /* Initialise the first mode */

-    ZZZModeInit(pScrn, pScrn-&gt;currentMode);

-

-    /* Set the viewport if supported */

-

-    ZZZAdjustFrame(scrnIndex, pScrn-&gt;frameX0, pScrn-&gt;frameY0, 0);

-

-    /*

-     * Setup the screen's visuals, and initialise the framebuffer

-     * code.

-     */

-

-    /* Reset the visual list */

-    miClearVisualTypes();

-

-    /*

-     * Setup the visuals supported.  This driver only supports

-     * TrueColor for bpp &gt; 8, so the default set of visuals isn't

-     * acceptable.  To deal with this, call miSetVisualTypes with

-     * the appropriate visual mask.

-     */

-

-    if (pScrn-&gt;bitsPerPixel &gt; 8) {

-        if (!miSetVisualTypes(pScrn-&gt;depth, TrueColorMask,

-                              pScrn-&gt;rgbBits, pScrn-&gt;defaultVisual))

-            return FALSE;

-    } else {

-        if (!miSetVisualTypes(pScrn-&gt;depth,

-                              miGetDefaultVisualMask(pScrn-&gt;depth),

-                              pScrn-&gt;rgbBits, pScrn-&gt;defaultVisual))

-            return FALSE;

-    }

-

-    /*

-     * Initialise the framebuffer.

-     */

-

-    switch (pScrn-&gt;bitsPerPixel) {

-    case 1:

-        ret = xf1bppScreenInit(pScreen, FbBase,

-                               pScrn-&gt;virtualX, pScrn-&gt;virtualY,

-                               pScrn-&gt;xDpi, pScrn-&gt;yDpi,

-                               pScrn-&gt;displayWidth);

-        break;

-    case 4:

-        ret = xf4bppScreenInit(pScreen, FbBase,

-                               pScrn-&gt;virtualX, pScrn-&gt;virtualY,

-                               pScrn-&gt;xDpi, pScrn-&gt;yDpi,

-                               pScrn-&gt;displayWidth);

-        break;

-    case 8:

-        ret = cfbScreenInit(pScreen, FbBase,

-                            pScrn-&gt;virtualX, pScrn-&gt;virtualY,

-                            pScrn-&gt;xDpi, pScrn-&gt;yDpi,

-                            pScrn-&gt;displayWidth);

-        break;

-    case 16:

-        ret = cfb16ScreenInit(pScreen, FbBase,

-                              pScrn-&gt;virtualX, pScrn-&gt;virtualY,

-                              pScrn-&gt;xDpi, pScrn-&gt;yDpi,

-                              pScrn-&gt;displayWidth);

-        break;

-    case 24:

-        ret = cfb24ScreenInit(pScreen, FbBase,

-                              pScrn-&gt;virtualX, pScrn-&gt;virtualY,

-                              pScrn-&gt;xDpi, pScrn-&gt;yDpi,

-                              pScrn-&gt;displayWidth);

-        break;

-    case 32:

-        ret = cfb32ScreenInit(pScreen, FbBase,

-                              pScrn-&gt;virtualX, pScrn-&gt;virtualY,

-                              pScrn-&gt;xDpi, pScrn-&gt;yDpi,

-                              pScrn-&gt;displayWidth);

-        break;

-    default:

-        print a message about an internal error;

-        ret = FALSE;

-        break;

-    }

-

-    if (!ret)

-        return FALSE;

-

-    /* Override the default mask/offset settings */

-    if (pScrn-&gt;bitsPerPixel &gt; 8) {

-        for (i = 0, visual = pScreen-&gt;visuals;

-             i &lt; pScreen-&gt;numVisuals; i++, visual++) {

-            if ((visual-&gt;class | DynamicClass) == DirectColor) {

-                visual-&gt;offsetRed = pScrn-&gt;offset.red;

-                visual-&gt;offsetGreen = pScrn-&gt;offset.green;

-                visual-&gt;offsetBlue = pScrn-&gt;offset.blue;

-                visual-&gt;redMask = pScrn-&gt;mask.red;

-                visual-&gt;greenMask = pScrn-&gt;mask.green;

-                visual-&gt;blueMask = pScrn-&gt;mask.blue;

-            }

-        }

-    }

-

-    /*

-     * If banking is needed, initialise an miBankInfoRec (defined in

-     * "mibank.h"), and call miInitializeBanking().

-     */

-    if (!miInitializeBanking(pScreen, pScrn-&gt;virtualX, pScrn-&gt;virtualY,

-                                     pScrn-&gt;displayWidth, pBankInfo))

-        return FALSE;

-

-    /*

-     * If backing store is to be supported (as is usually the case),

-     * initialise it.

-     */

-    miInitializeBackingStore(pScreen);

-

-    /*

-     * Set initial black &amp; white colourmap indices.

-     */

-    xf86SetBlackWhitePixels(pScreen);

-

-    /*

-     * Install colourmap functions.  If using the vgahw module,

-     * vgaHandleColormaps would usually be called here.

-     */

-

-    ...

-

-    /*

-     * Initialise cursor functions.  This example is for the mi

-     * software cursor.

-     */

-    miDCInitialize(pScreen, xf86GetPointerScreenFuncs());

-

-    /* Initialise the default colourmap */

-    switch (pScrn-&gt;depth) {

-    case 1:

-        if (!xf1bppCreateDefColormap(pScreen))

-            return FALSE;

-        break;

-    case 4:

-        if (!xf4bppCreateDefColormap(pScreen))

-            return FALSE;

-        break;

-    default:

-        if (!cfbCreateDefColormap(pScreen))

-            return FALSE;

-        break;

-    }

-

-    /*

-     * Wrap the CloseScreen vector and set SaveScreen.

-     */

-    ZZZPTR(pScrn)-&gt;CloseScreen = pScreen-&gt;CloseScreen;

-    pScreen-&gt;CloseScreen = ZZZCloseScreen;

-    pScreen-&gt;SaveScreen = ZZZSaveScreen;

-

-    /* Report any unused options (only for the first generation) */

-    if (serverGeneration == 1) {

-        xf86ShowUnusedOptions(pScrn-&gt;scrnIndex, pScrn-&gt;options);

-    }

-

-    /* Done */

-    return TRUE;

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>SwitchMode</title>

-

-	<para>

-    Define the <function>SwitchMode()</function> function if mode switching

-    is supported by the driver.

-	</para>

-

-	<programlisting>

-static Bool

-ZZZSwitchMode(int scrnIndex, DisplayModePtr mode, int flags)

-{

-    return ZZZModeInit(xf86Screens[scrnIndex], mode);

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>AdjustFrame</title>

-

-	<para>

-    Define the <function>AdjustFrame()</function> function if the driver

-    supports this.

-	</para>

-

-	<programlisting>

-static void

-ZZZAdjustFrame(int scrnIndex, int x, int y, int flags)

-{

-    /* Adjust the viewport */

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>EnterVT, LeaveVT</title>

-

-	<para>

-    Define the <function>EnterVT()</function> and <function>LeaveVT()</function>

-    functions.

-	</para>

-

-	<para>

-    These functions are mandatory.

-	</para>

-

-	<programlisting>

-static Bool

-ZZZEnterVT(int scrnIndex, int flags)

-{

-    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];

-    return ZZZModeInit(pScrn, pScrn-&gt;currentMode);

-}

-

-static void

-ZZZLeaveVT(int scrnIndex, int flags)

-{

-    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];

-    ZZZRestore(pScrn);

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>CloseScreen</title>

-

-	<para>

-    Define the <function>CloseScreen()</function> function:

-	</para>

-

-	<para>

-    This function is mandatory.  Note that it unwraps the previously

-    wrapped <structfield>pScreen-&gt;CloseScreen</structfield>, and finishes by

-    calling it.

-	</para>

-

-	<programlisting>

-static Bool

-ZZZCloseScreen(int scrnIndex, ScreenPtr pScreen)

-{

-    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];

-    if (pScrn-&gt;vtSema) {

-        ZZZRestore(pScrn);

-        ZZZUnmapMem(pScrn);

-    }

-    pScrn-&gt;vtSema = FALSE;

-    pScreen-&gt;CloseScreen = ZZZPTR(pScrn)-&gt;CloseScreen;

-    return (*pScreen-&gt;CloseScreen)(scrnIndex, pScreen);

-}

-	</programlisting>

-      </sect3>

-

-      <sect3>

-	<title>SaveScreen</title>

-

-	<para>

-    Define the <function>SaveScreen()</function> function (the screen

-    blanking function).  When using the vgahw module, this will typically

-    be:

-

-	  <programlisting>

-static Bool

-ZZZSaveScreen(ScreenPtr pScreen, int mode)

-{

-    return vgaHWSaveScreen(pScreen, mode);

-}

-	  </programlisting>

-	</para>

-

-	<para>

-    This function is mandatory.  Before modifying any hardware register

-    directly this function needs to make sure that the Xserver is active

-    by checking if <parameter>pScrn</parameter> is non-NULL and for

-    <literal remap="tt">pScrn-&gt;vtSema == TRUE</literal>.

-	</para>

-      </sect3>

-

-      <sect3>

-	<title>FreeScreen</title>

-

-	<para>

-    Define the <function>FreeScreen()</function> function.  This function

-    is optional.  It should be defined if the <structname>ScrnInfoRec</structname>

-    <structfield>driverPrivate</structfield> field is used so that it can be freed

-    when a screen is deleted by the common layer for reasons possibly

-    beyond the driver's control.  This function is not used in during

-    normal (error free) operation.  The per-generation data is freed by

-    the <function>CloseScreen()</function> function.

-	</para>

-

-	<programlisting>

-static void

-ZZZFreeScreen(int scrnIndex, int flags)

-{

-    /*

-     * If the vgahw module is used vgaHWFreeHWRec() would be called

-     * here.

-     */

-    ZZZFreeRec(xf86Screens[scrnIndex]);

-}

-

-	</programlisting>

-

-      </sect3>

-

-    </sect2>

-

-  </sect1>

-

-</article>

+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+ "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
+ <!ENTITY % defs SYSTEM "/xserver/doc/xml/xserver.ent"> %defs;
+ <!-- config file keyword markup -->
+ <!-- specific config file keywords -->
+ <!ENTITY k.device "<emphasis>Device</emphasis>">
+ <!ENTITY k.monitor "<emphasis>Monitor</emphasis>">
+ <!ENTITY k.display "<emphasis>Display</emphasis>">
+ <!ENTITY k.inputdevice "<emphasis>InputDevice</emphasis>">
+ <!ENTITY k.screen "<emphasis>Screen</emphasis>">
+ <!ENTITY k.serverlayout "<emphasis>ServerLayout</emphasis>">
+ <!ENTITY k.driver "<emphasis>Driver</emphasis>">
+ <!ENTITY k.module "<emphasis>Module</emphasis>">
+ <!ENTITY k.identifier "<emphasis>Identifier</emphasis>">
+ <!ENTITY k.serverflags "<emphasis>ServerFlags</emphasis>">
+] >
+
+<article id="ddxDesign">
+  <articleinfo>
+
+    <title>XFree86 DDX Design (Xorg server version &xserver.version;)</title>
+
+    <authorgroup>
+      <corpauthor><ulink url="http://www.xfree86.org/">
+	The XFree86 Project, Inc.</ulink></corpauthor>
+      <corpauthor><ulink url="http://www.x.org/">
+	The X.Org Foundation, Inc.</ulink></corpauthor>
+
+      <othercredit>
+	<firstname>Jim</firstname><surname>Gettys</surname>
+	<contrib>Updates for X11R6.7</contrib>
+      </othercredit>
+    </authorgroup>
+
+    <pubdate>&xserver.reldate;</pubdate>
+    <releaseinfo>Xorg server version &xserver.version;</releaseinfo>
+
+  </articleinfo>
+
+  <note><para>
+This document describes software undergoing continual evolution, and
+the interfaces described here are subject to change without notice.
+This document is intended to cover the interfaces as found in the
+xorg-server-&xserver.version; release, but is probably not completely
+in sync with the code base.
+    </para></note>
+
+
+  <sect1>
+    <title>Preface</title>
+
+    <para>
+This document was originally the design spec for the DDX layer of the
+XFree86 4.0 X server.  The X.Org Foundation adopted the XFree86 4.4rc2
+version of that server as the basis of the Xorg server project, and has
+evolved the XFree86 DDX layer greatly since forking.   This document thus
+covers only the current implementation of the XFree86 DDX as found in the
+Xorg server &xserver.version; release, and no longer matches the XFree86
+server itself.
+      </para>
+
+    <para>
+The XFree86 Project's broad design principles for XFree86 4.0 were:
+      <itemizedlist>
+	<listitem><para>keep it reasonable
+	    <itemizedlist>
+	      <listitem><para>We cannot rewrite the complete server
+		</para></listitem>
+	      <listitem><para>We don't want to re-invent the wheel
+		</para></listitem>
+	    </itemizedlist></para></listitem>
+	<listitem><para>keep it modular
+	    <itemizedlist>
+	      <listitem><para>As many things as possible should go into modules
+		</para></listitem>
+	      <listitem><para>The basic loader binary should be minimal
+		</para></listitem>
+	      <listitem><para>A clean design with well defined layering is
+		  important</para></listitem>
+	      <listitem><para>DDX specific global variables are a nono
+		</para></listitem>
+	      <listitem><para>The structure should be flexible enough to allow
+		  future extensions</para></listitem>
+	      <listitem><para>The structure should minimize duplication of
+		  common code</para></listitem>
+	    </itemizedlist></para></listitem>
+	<listitem><para>keep important features in mind
+	    <itemizedlist>
+	      <listitem><para>multiple screens, including multiple instances
+		  of drivers</para></listitem>
+	      <listitem><para>mixing different color depths and visuals on
+		  different and ideally even on the same screen
+		</para></listitem>
+	      <listitem><para>better control of the PCI device used
+		</para></listitem>
+	      <listitem><para>better config file parser</para></listitem>
+	      <listitem><para>get rid of all VGA compatibility assumptions
+		</para></listitem>
+	    </itemizedlist></para></listitem>
+      </itemizedlist>
+    </para>
+
+    <para>
+While the XFree86 project had a goal of avoiding changes to the DIX
+layer unless they found major deficiencies there, to avoid divergence from
+the X.Org sample implementation they were integrating changes from, the
+X.Org developers now maintain both sides, and make changes where they are
+most appropriate.   This document concentrates on the XFree86 DDX layer used
+in the Xorg server itself (the code found in <filename>hw/xfree86</filename>
+in the source tree), and developers will also want to refer to the
+<filename>Xserver-spec</filename> documentation that covers the DIX layer
+routines common to all the X servers in the sample implementation.
+    </para>
+  </sect1>
+
+  <sect1>
+    <title>The xorg.conf File</title>
+
+    <para>
+The xorg.conf file format is based on the XF86Config format from XFree86 4.4,
+which is in turn similar to the old XFree86 3.x XF86Config format, with the
+following changes:
+    </para>
+
+    <sect2>
+      <title>&k.device; section</title>
+
+      <para>
+    The &k.device; sections are similar to what they used to be, and
+    describe hardware-specific information for a single video card.
+    &k.device;
+    Some new keywords are added:
+
+
+	<variablelist>
+	  <varlistentry><term>Driver "drivername"</term>
+	    <listitem><para>
+        Specifies the name of the driver to be used for the card.  This
+        is mandatory.
+	      </para></listitem></varlistentry>
+	  <varlistentry><term>BusID "busslot"</term>
+	    <listitem><para>
+        Specifies uniquely the location of the card on the bus.  The
+        purpose is to identify particular cards in a multi-headed
+        configuration.  The format of the argument is intentionally
+        vague, and may be architecture dependent.  For a PCI bus, it
+        is something like "bus:slot:func".
+	      </para></listitem></varlistentry>
+	</variablelist>
+      </para>
+
+      <para>
+    A &k.device; section is considered <quote>active</quote> if there is a reference
+    to it in an active &k.screen; section.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>&k.screen; section</title>
+
+      <para>
+    The &k.screen; sections are similar to what they used to be.  They
+    no longer have a &k.driver; keyword, but an &k.identifier; keyword
+    is added.  (The &k.driver; keyword may be accepted in place of the
+    &k.identifier; keyword for compatibility purposes.)  The identifier
+    can be used to identify which screen is to be active when multiple
+    &k.screen; sections are present.  It is possible to specify the active
+    screen from the command line.  A default is chosen in the absence
+    of one being specified.  A &k.screen; section is considered <quote>active</quote>
+    if there is a reference to it either from the command line, or from
+    an active &k.serverlayout; section.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>&k.inputdevice; section</title>
+
+      <para>
+    The &k.inputdevice; section is a new section that describes
+    configuration information for input devices.  It replaces the old
+    <emphasis>Keyboard</emphasis>, <emphasis>Pointer</emphasis> and <emphasis>XInput</emphasis>
+    sections.  Like the &k.device; section, it has two mandatory keywords:
+    &k.identifier; and &k.driver;.  For compatibility purposes the old
+    <emphasis>Keyboard</emphasis> and <emphasis>Pointer</emphasis> sections are
+    converted by the parser into &k.inputdevice; sections as follows:
+
+	<variablelist>
+	  <varlistentry><term><emphasis>Keyboard</emphasis></term>
+	    <listitem><literallayout>
+             &k.identifier; "Implicit Core Keyboard"
+             &k.driver; "keyboard"
+	      </literallayout></listitem></varlistentry>
+	  <varlistentry><term><emphasis>Pointer</emphasis></term>
+	    <listitem><literallayout>
+             &k.identifier; "Implicit Core Pointer"
+             &k.driver; "mouse"
+	      </literallayout></listitem></varlistentry>
+	</variablelist>
+      </para>
+
+      <para>
+    An &k.inputdevice; section is considered active if there is a
+    reference to it in an active &k.serverlayout; section.  An
+    &k.inputdevice; section may also be referenced implicitly if there
+    is no &k.serverlayout; section, if the <option>-screen</option> command
+    line options is used, or if the &k.serverlayout; section doesn't
+    reference any &k.inputdevice; sections.  In this case, the first
+    sections with drivers "keyboard" and "mouse" are used as the core
+    keyboard and pointer respectively.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>&k.serverlayout; section</title>
+
+      <para>
+    The &k.serverlayout; section is a new section that is used to identify
+    which &k.screen; sections are to be used in a multi-headed configuration,
+    and the relative layout of those screens.  It also identifies which
+    &k.inputdevice; sections are to be used.  Each &k.serverlayout; section
+    has an identifier, a list of &k.screen; section identifiers, and a list of
+    &k.inputdevice; section identifiers.  &k.serverflags; options may also be
+    included in a &k.serverlayout; section, making it possible to override
+    the global values in the &k.serverflags; section.
+      </para>
+
+      <para>
+    A &k.serverlayout; section can be made active by being referenced on
+    the command line.  In the absence of this, a default will be chosen
+    (the first one found).  The screen names may optionally be followed
+    by a number specifying the preferred screen number, and optionally
+    by information specifying the physical positioning of the screen,
+    either in absolute terms or relative to another screen (or screens).
+    When no screen number is specified, they are numbered according to
+    the order in which they are listed.  The old (now obsolete) method
+    of providing the positioning information is to give the names of
+    the four adjacent screens.  The order of these is top, bottom, left,
+    right.  Here is an example of a &k.serverlayout; section for two
+    screens using the old method, with the second located to the right
+    of the first:
+
+	<programlisting>
+      Section "ServerLayout"
+        Identifier "Main Layout"
+        Screen     0 "Screen 1" ""  ""  ""  "Screen 2"
+        Screen     1 "Screen 2"
+        Screen     "Screen 3"
+      EndSection
+	</programlisting>
+      </para>
+
+      <para>
+    The preferred way of specifying the layout is to explicitly specify
+    the screen's location in absolute terms or relative to another
+    screen.
+      </para>
+
+      <para>
+    In the absolute case, the upper left corner's coordinates are given
+    after the <emphasis>Absolute</emphasis> keyword.  If the coordinates are
+    omitted, a value of <code>(0,0)</code> is assumed.  An example
+    of absolute positioning follows:
+
+	<programlisting>
+      Section "ServerLayout"
+        Identifier "Main Layout"
+        Screen     0 "Screen 1" Absolute 0 0
+        Screen     1 "Screen 2" Absolute 1024 0
+        Screen     "Screen 3" Absolute 2048 0
+      EndSection
+	</programlisting>
+      </para>
+
+      <para>
+    In the relative case, the position is specified by either using one of
+    the following keywords followed by the name of the reference screen:
+
+	<simplelist type='vert' columns='1'>
+	  <member><emphasis>RightOf</emphasis></member>
+	  <member><emphasis>LeftOf</emphasis></member>
+	  <member><emphasis>Above</emphasis></member>
+	  <member><emphasis>Below</emphasis></member>
+	  <member><emphasis>Relative</emphasis></member>
+	</simplelist>
+      </para>
+
+      <para>
+    When the <emphasis>Relative</emphasis> keyword is used, the reference screen
+    name is followed by the coordinates of the new screen's origin
+    relative to reference screen.  The following example shows how to use
+    some of the relative positioning options.
+
+	<programlisting>
+      Section "ServerLayout"
+        Identifier "Main Layout"
+        Screen     0 "Screen 1"
+        Screen     1 "Screen 2" RightOf "Screen 1"
+        Screen     "Screen 3" Relative "Screen 1" 2048 0
+      EndSection
+	</programlisting>
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Options</title>
+
+      <para>
+    Options are used more extensively.  They may appear in most sections
+    now.  Options related to drivers can be present in the &k.screen;,
+    &k.device; and &k.monitor; sections and the &k.display; subsections.
+    The order of precedence is &k.display;, &k.screen;, &k.monitor;,
+    &k.device;.  Options have been extended to allow an optional value
+    to be specified in addition to the option name.  For more details
+    about options, see the <link linkend="options">Options</link> section
+    for details.
+      </para>
+    </sect2>
+  </sect1>
+
+  <sect1>
+    <title>Driver Interface</title>
+
+    <para>
+The driver interface consists of a minimal set of entry points that are
+required based on the external events that the driver must react to.
+No non-essential structure is imposed on the way they are used beyond
+that.  This is a significant difference compared with the old design.
+    </para>
+
+    <para>
+The entry points for drawing operations are already taken care of by
+the framebuffer code (including, XAA).  Extensions and enhancements to
+framebuffer code are outside the scope of this document.
+    </para>
+
+    <para>
+This approach to the driver interface provides good flexibility, but does
+increase the complexity of drivers.  To help address this, the XFree86
+common layer provides a set of <quote>helper</quote> functions to take care of things
+that most drivers need.  These helpers help minimise the amount of code
+duplication between drivers.  The use of helper functions by drivers is
+however optional, though encouraged.  The basic philosophy behind the
+helper functions is that they should be useful to many drivers, that
+they should balance this against the complexity of their interface.  It
+is inevitable that some drivers may find some helpers unsuitable and
+need to provide their own code.
+    </para>
+
+    <para>
+Events that a driver needs to react to are:
+
+      <variablelist>
+	<varlistentry><term>ScreenInit</term>
+
+	  <listitem><para>
+     An initialisation function is called from the DIX layer for each
+     screen at the start of each server generation.
+	    </para></listitem></varlistentry>
+
+	<varlistentry><term>Enter VT</term>
+
+	  <listitem><para>
+     The server takes control of the console.
+	    </para></listitem></varlistentry>
+
+	<varlistentry><term>Leave VT</term>
+
+	  <listitem><para>
+     The server releases control of the console.
+	    </para></listitem></varlistentry>
+
+	<varlistentry><term>Mode Switch</term>
+
+	  <listitem><para>
+     Change video mode.
+	    </para></listitem></varlistentry>
+
+	<varlistentry><term>ViewPort change</term>
+
+	  <listitem><para>
+     Change the origin of the physical view port.
+	    </para></listitem></varlistentry>
+
+	<varlistentry><term>ScreenSaver state change</term>
+
+	  <listitem><para>
+     Screen saver activation/deactivation.
+	    </para></listitem></varlistentry>
+
+	<varlistentry><term>CloseScreen</term>
+
+	  <listitem><para>
+     A close screen function is called from the DIX layer for each screen
+     at the end of each server generation.
+	    </para></listitem></varlistentry>
+      </variablelist>
+    </para>
+
+
+    <para>
+In addition to these events, the following functions are required by
+the XFree86 common layer:
+
+      <variablelist>
+	<varlistentry><term>Identify</term>
+
+	  <listitem><para>
+     Print a driver identifying message.
+	    </para></listitem></varlistentry>
+
+	<varlistentry><term>Probe</term>
+
+	  <listitem><para>
+     This is how a driver identifies if there is any hardware present that
+     it knows how to drive.
+	    </para></listitem></varlistentry>
+
+	<varlistentry><term>PreInit</term>
+
+	  <listitem><para>
+     Process information from the xorg.conf file, determine the
+     full characteristics of the hardware, and determine if a valid
+     configuration is present.
+	    </para></listitem></varlistentry>
+      </variablelist>
+    </para>
+
+    <para>
+The VidMode extension also requires:
+
+      <variablelist>
+	<varlistentry><term>ValidMode</term>
+
+	  <listitem><para>
+     Identify if a new mode is usable with the current configuration.
+     The PreInit function (and/or helpers it calls) may also make use
+     of the ValidMode function or something similar.
+	    </para></listitem></varlistentry>
+      </variablelist>
+    </para>
+
+
+    <para>
+Other extensions may require other entry points.  The drivers will
+inform the common layer of these in such cases.
+    </para>
+  </sect1>
+
+  <sect1>
+    <title>Resource Access Control Introduction</title>
+
+    <para>
+Graphics devices are accessed through ranges in I/O or memory space.
+While most modern graphics devices allow relocation of such ranges many
+of them still require the use of well established interfaces such as
+VGA memory and IO ranges or 8514/A IO ranges.  With modern buses (like
+PCI) it is possible for multiple video devices to share access to these
+resources.  The RAC (Resource Access Control) subsystem provides a
+mechanism for this.
+    </para>
+
+    <sect2>
+      <title>Terms and Definitions</title>
+
+      <sect3>
+	<title>Bus</title>
+
+	<para>
+    <quote>Bus</quote> is ambiguous as it is used for different things: it may refer
+    to physical incompatible extension connectors in a computer system.
+    The RAC system knows two such systems: The ISA bus and the PCI bus.
+    (On the software level EISA, MCA and VL buses are currently treated
+    like ISA buses).  <quote>Bus</quote> may also refer to logically different
+    entities on a single bus system which are connected via bridges.  A
+    PCI system may have several distinct PCI buses connecting each other
+    by PCI-PCI bridges or to the host CPU by HOST-PCI bridges.
+	</para>
+
+	<para>
+    Systems that host more than one bus system link these together using
+    bridges.  Bridges are a concern to RAC as they might block or pass
+    specific resources.  PCI-PCI bridges may be set up to pass VGA
+    resources to the secondary bus.  PCI-ISA buses pass any resources not
+    decoded on the primary PCI bus to the ISA bus.  This way VGA resources
+    (although exclusive on the ISA bus) can be shared by ISA and PCI
+    cards.  Currently HOST-PCI bridges are not yet handled by RAC as they
+    require specific drivers.
+	</para>
+      </sect3>
+
+      <sect3>
+	<title>Entity</title>
+
+	<para>
+    The smallest independently addressable unit on a system bus is
+    referred to as an entity.  So far we know ISA and PCI entities.  PCI
+    entities can be located on the PCI bus by an unique ID consisting of
+    the bus, card and function number.
+	</para>
+      </sect3>
+
+      <sect3>
+	<title>Resource</title>
+
+	<para>
+    <quote>Resource</quote> refers to a range of memory or I/O addresses an entity
+    can decode.
+	</para>
+
+	<para>
+    If a device is capable of disabling this decoding the resource is
+    called sharable.  For PCI devices a generic method is provided to
+    control resource decoding.  Other devices will have to provide a
+    device specific function to control decoding.
+	</para>
+
+	<para>
+    If the entity is capable of decoding this range at a different
+    location this resource is considered relocatable.
+	</para>
+
+	<para>
+    Resources which start at a specific address and occupy a single
+    continuous range are called block resources.
+	</para>
+
+	<para>
+    Alternatively resource addresses can be decoded in a way that they
+    satisfy the conditions:
+	  <programlisting>
+                    address &amp; mask == base
+	  </programlisting>
+    and
+	  <programlisting>
+                       base &amp; mask == base
+	  </programlisting>
+    Resources addressed in such a way are called sparse resources.
+	</para>
+
+      </sect3>
+
+      <sect3>
+	<title>Server States</title>
+
+	<para>
+    The resource access control system knows two server states: the
+    SETUP and the OPERATING state.  The SETUP state is entered whenever
+    a mode change takes place or the server exits or does VT switching.
+    During this state all entity resources are under resource access
+    control.  During OPERATING state only those entities are controlled
+    which actually have shared resources that conflict with others.
+	</para>
+      </sect3>
+    </sect2>
+  </sect1>
+
+  <sect1>
+    <title>Control Flow in the Server and Mandatory Driver Functions</title>
+
+    <para>
+At the start of each server generation, <function>main()</function>
+(<filename>dix/main.c</filename>) calls the DDX function
+<function>InitOutput()</function>.  This is the first place that the DDX gets
+control.  <function>InitOutput()</function> is expected to fill in the global
+<structname>screenInfo</structname> struct, and one
+<structfield>screenInfo.screen[]</structfield> entry for each screen present.
+Here is what <function>InitOutput()</function> does:
+    </para>
+
+    <sect2>
+      <title>Parse the xorg.conf file</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    The xorg.conf file is read in full, and the resulting information
+    stored in data structures.  None of the parsed information is
+    processed at this point.  The parser data structures are opaque to
+    the video drivers and to most of the common layer code.
+      </para>
+
+      <para>
+    The entire file is parsed first to remove any section ordering
+    requirements.
+      </para>
+    </sect2>
+
+
+    <sect2>
+      <title>Initial processing of parsed information and command line options
+      </title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    The initial processing is to determine paths like the
+    <emphasis>ModulePath</emphasis>, etc, and to determine which &k.serverlayout;,
+    &k.screen; and &k.device; sections are active.
+      </para>
+    </sect2>
+
+
+    <sect2>
+      <title>Enable port I/O access</title>
+
+      <para>
+    Port I/O access is controlled from the XFree86 common layer, and is
+    <quote>all or nothing</quote>.  It is enabled prior to calling driver probes, at
+    the start of subsequent server generations, and when VT switching
+    back to the Xserver.  It is disabled at the end of server generations,
+    and when VT switching away from the Xserver.
+      </para>
+
+      <para>
+    The implementation details of this may vary on different platforms.
+      </para>
+    </sect2>
+
+
+    <sect2>
+      <title>General bus probe</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    In the case of ix86 machines, this will be a general PCI probe.
+    The full information obtained here will be available to the drivers.
+    This information persists for the life of the Xserver.  In the PCI
+    case, the PCI information for all video cards found is available by
+    calling <function>xf86GetPciVideoInfo()</function>.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    pciVideoPtr *xf86GetPciVideoInfo(void);
+	  </programlisting>
+	  <blockquote><para>
+	returns a pointer to a list of pointers to
+	<structname>pciVideoRec</structname> entries, of which there is one for
+	each detected PCI video card.  The list is terminated with a
+	<constant>NULL</constant> pointer.  If no PCI video cards were
+	detected, the return value is <constant>NULL</constant>.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+      <para>
+    After the bus probe, the resource broker is initialised.
+      </para>
+    </sect2>
+
+
+    <sect2>
+      <title>Load initial set of modules</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    The core server contains a list of mandatory modules.  These are loaded
+    first.  Currently the only module on this list is the bitmap font module.
+      </para>
+
+      <para>
+    The next set of modules loaded are those specified explicitly in the
+    &k.module; section of the config file.
+      </para>
+
+      <para>
+    The final set of initial modules are the driver modules referenced
+    by the active &k.device; and &k.inputdevice; sections in the config
+    file.  Each of these modules is loaded exactly once.
+      </para>
+    </sect2>
+
+
+    <sect2>
+      <title>Register Video and Input Drivers</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    When a driver module is loaded, the loader calls its
+    <function>Setup</function> function.  For video drivers, this function
+    calls <function>xf86AddDriver()</function> to register the driver's
+    <structname>DriverRec</structname>, which contains a small set of essential
+    details and driver entry points required during the early phase of
+    <function>InitOutput()</function>.  <function>xf86AddDriver()</function>
+    adds it to the global <varname>xf86DriverList[]</varname> array.
+      </para>
+
+      <para>
+    The <structname>DriverRec</structname> contains the driver canonical name,
+    the <function>Identify()</function>,
+    <function>Probe()</function> and <function>AvailableOptions()</function>
+    function entry points as well as a pointer
+    to the driver's module (as returned from the loader when the driver
+    was loaded) and a reference count which keeps track of how many
+    screens are using the driver.  The entry driver entry points are
+    those required prior to the driver allocating and filling in its
+    <structname>ScrnInfoRec</structname>.
+      </para>
+
+      <para>
+    For a static server, the <varname>xf86DriverList[]</varname> array is
+    initialised at build time, and the loading of modules is not done.
+      </para>
+
+      <para>
+    A similar procedure is used for input drivers.  The input driver's
+    <function>Setup</function> function calls
+    <function>xf86AddInputDriver()</function> to register the driver's
+    <structname>InputDriverRec</structname>, which contains a small set of
+    essential details and driver entry points required during the early
+    phase of <function>InitInput()</function>.
+    <function>xf86AddInputDriver()</function> adds it to the global
+    <varname>xf86InputDriverList[]</varname> array.  For a static server,
+    the <varname>xf86InputDriverList[]</varname> array is initialised at
+    build time.
+      </para>
+
+      <para>
+    Both the <varname>xf86DriverList[]</varname> and
+    <varname>xf86InputDriverList[]</varname> arrays have been initialised
+    by the end of this stage.
+      </para>
+
+      <para>
+    Once all the drivers are registered, their
+    <function>ChipIdentify()</function> functions are called.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    void ChipIdentify(int flags);
+	  </programlisting>
+	  <blockquote><para>
+      This is expected to print a message indicating the driver name,
+      a short summary of what it supports, and a list of the chipset
+      names that it supports.  It may use the xf86PrintChipsets() helper
+      to do this.
+	    </para></blockquote>
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86PrintChipsets(const char *drvname, const char *drvmsg,
+                           SymTabPtr chips);
+	  </programlisting>
+	  <blockquote><para>
+      This function provides an easy way for a driver's ChipIdentify
+      function to format the identification message.
+	    </para></blockquote>
+	</para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Initialise Access Control</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    The Resource Access Control (RAC) subsystem is initialised before
+    calling any driver functions that may access hardware.  All generic
+    bus information is probed and saved (for restoration later).  All
+    (shared resource) video devices are disabled at the generic bus
+    level, and a probe is done to find the <quote>primary</quote> video device.  These
+    devices remain disabled for the next step.
+      </para>
+    </sect2>
+
+
+    <sect2 id="probe">
+      <title>Video Driver Probe</title>
+
+      <para>
+    This is done at the start of the first server generation only.  The
+    <function>ChipProbe()</function> function of each registered video driver
+    is called.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool ChipProbe(DriverPtr drv, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      The purpose of this is to identify all instances of hardware
+      supported by the driver.  The flags value is currently either 0,
+      <constant>PROBE_DEFAULT</constant> or <constant>PROBE_DETECT</constant>.
+      <constant>PROBE_DETECT</constant> is used if "-configure" or "-probe"
+      command line arguments are given and indicates to the
+      <function>Probe()</function> function that it should not configure the
+      bus entities and that no xorg.conf information is available.
+	    </para>
+
+	  <para>
+      The probe must find the active device sections that match the
+      driver by calling <function>xf86MatchDevice()</function>.  The number
+      of matches found limits the maximum number of instances for this
+      driver.  If no matches are found, the function should return
+      <constant>FALSE</constant> immediately.
+	  </para>
+
+	<para>
+      Devices that cannot be identified by using device-independent
+      methods should be probed at this stage (keeping in mind that access
+      to all resources that can be disabled in a device-independent way
+      are disabled during this phase).  The probe must be a minimal
+      probe.  It should just determine if there is a card present that
+      the driver can drive.  It should use the least intrusive probe
+      methods possible.  It must not do anything that is not essential,
+      like probing for other details such as the amount of memory
+      installed, etc.  It is recommended that the
+      <function>xf86MatchPciInstances()</function> helper function be used
+      for identifying matching PCI devices, and similarly the
+      <function>xf86MatchIsaInstances()</function> for ISA (non-PCI) devices
+      (see the <link linkend="rac">RAC</link> section).  These helpers also
+      checks and claims the appropriate entity.  When not using the
+      helper, that should be done with <function>xf86CheckPciSlot()</function>
+      and <function>xf86ClaimPciSlot()</function> for PCI devices and
+      <function>xf86ClaimIsaSlot()</function> for ISA devices (see the
+      <link linkend="rac">RAC</link> section).
+	</para>
+
+	<para>
+      The probe must register all non-relocatable resources at this
+      stage.  If a resource conflict is found between exclusive resources
+      the driver will fail immediately.  This is usually best done with
+      the <function>xf86ConfigPciEntity()</function> helper function
+      for PCI and <function>xf86ConfigIsaEntity()</function> for ISA
+      (see the <link linkend="rac">RAC</link> section).  It is possible to
+      register some entity specific functions with those helpers.  When
+      not using the helpers, the <function>xf86AddEntityToScreen()</function>
+      <function>xf86ClaimFixedResources()</function> and
+      <function>xf86SetEntityFuncs()</function> should be used instead (see
+      the <link linkend="rac">RAC</link> section).
+	</para>
+
+	<para>
+      If a chipset is specified in an active device section which the
+      driver considers relevant (ie it has no driver specified, or the
+      driver specified matches the driver doing the probe), the Probe
+      must return <constant>FALSE</constant> if the chipset doesn't match
+      one supported by the driver.
+	</para>
+
+	<para>
+      If there are no active device sections that the driver considers
+      relevant, it must return <constant>FALSE</constant>.
+	</para>
+
+	<para>
+      Allocate a <structname>ScrnInfoRec</structname> for each active instance of the
+      hardware found, and fill in the basic information, including the
+      other driver entry points.   This is best done with the
+      <function>xf86ConfigIsaEntity()</function> helper function for ISA
+      instances or <function>xf86ConfigPciEntity()</function> for PCI instances.
+      These functions allocate a <structname>ScrnInfoRec</structname> for active
+      entities. Optionally <function>xf86AllocateScreen()</function>
+      function may also be used to allocate the <structname>ScrnInfoRec</structname>.
+      Any of these functions take care of initialising fields to defined
+      <quote>unused</quote> values.
+	</para>
+
+	<para>
+      Claim the entities for each instance of the hardware found.  This
+      prevents other drivers from claiming the same hardware.
+	</para>
+
+	<para>
+      Must leave hardware in the same state it found it in, and must not
+      do any hardware initialisation.
+	</para>
+
+	<para>
+      All detection can be overridden via the config file, and that
+      parsed information is available to the driver at this stage.
+	</para>
+
+	<para>
+      Returns <constant>TRUE</constant> if one or more instances are found,
+      and <constant>FALSE</constant> otherwise.
+	</para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    int xf86MatchDevice(const char *drivername,
+                        GDevPtr **driversectlist)
+	  </programlisting>
+	  <blockquote><para>
+      This function takes the name of the driver and returns via
+      <parameter>driversectlist</parameter> a list of device sections that
+      match the driver name.  The function return value is the number
+      of matches found.  If a fatal error is encountered the return
+      value is <literal>-1</literal>.
+	    </para>
+
+	    <para>
+      The caller should use <function>xfree()</function> to free
+      <parameter>*driversectlist</parameter> when it is no longer needed.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    ScrnInfoPtr xf86AllocateScreen(DriverPtr drv, int flags)
+	  </programlisting>
+	  <blockquote><para>
+      This function allocates a new <structname>ScrnInfoRec</structname> in the
+      <varname>xf86Screens[]</varname> array.  This function is normally
+      called by the video driver <function>ChipProbe()</function> functions.
+      The return value is a pointer to the newly allocated
+      <structname>ScrnInfoRec</structname>.  The <structfield>scrnIndex</structfield>,
+      <structfield>origIndex</structfield>, <structfield>module</structfield> and
+      <structfield>drv</structfield> fields are initialised.  The reference count
+      in <parameter>drv</parameter> is incremented.  The storage for any
+      currently allocated <quote>privates</quote> pointers is also allocated and
+      the <structfield>privates</structfield> field initialised (the privates data
+      is of course not allocated or initialised).  This function never
+      returns on failure.  If the allocation fails, the server exits
+      with a fatal error.  The flags value is not currently used, and
+      should be set to zero.
+	    </para></blockquote>
+	</para></blockquote>
+
+      <para>
+    At the completion of this, a list of <structname>ScrnInfoRecs</structname>
+    have been allocated in the <varname>xf86Screens[]</varname> array, and
+    the associated entities and fixed resources have been claimed.  The
+    following <structname>ScrnInfoRec</structname> fields must be initialised at
+    this point:
+
+	<literallayout>
+          driverVersion
+          driverName
+          scrnIndex(*)
+          origIndex(*)
+          drv(*)
+          module(*)
+          name
+          Probe
+          PreInit
+          ScreenInit
+          EnterVT
+          LeaveVT
+          numEntities
+          entityList
+          access
+	</literallayout>
+
+    <literal>(*)</literal> These are initialised when the <structname>ScrnInfoRec</structname>
+    is allocated, and not explicitly by the driver.
+      </para>
+
+      <para>
+    The following <structname>ScrnInfoRec</structname> fields must be initialised
+    if the driver is going to use them:
+
+	<literallayout>
+          SwitchMode
+          AdjustFrame
+          FreeScreen
+          ValidMode
+	</literallayout>
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Matching Screens</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    After the Probe phase is finished, there will be some number of
+    <structname>ScrnInfoRec</structname>s.  These are then matched with the active
+    &k.screen; sections in the xorg.conf, and those not having an active
+    &k.screen; section are deleted.  If the number of remaining screens
+    is 0, <function>InitOutput()</function> sets
+    <structfield>screenInfo.numScreens</structfield> to <constant>0</constant> and
+    returns.
+      </para>
+
+      <para>
+    At this point the following fields of the <structname>ScrnInfoRec</structname>s
+    must be initialised:
+
+	<literallayout>
+          confScreen
+	</literallayout>
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Allocate non-conflicting resources</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    Before calling the drivers again, the resource information collected
+    from the Probe phase is processed.  This includes checking the extent
+    of PCI resources for the probed devices, and resolving any conflicts
+    in the relocatable PCI resources.  It also reports conflicts, checks
+    bus routing issues, and anything else that is needed to enable the
+    entities for the next phase.
+      </para>
+
+      <para>
+    If any drivers registered an <function>EntityInit()</function> function
+    during the Probe phase, then they are called here.
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Sort the Screens and pre-check Monitor Information</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    The list of screens is sorted to match the ordering requested in the
+    config file.
+      </para>
+
+      <para>
+    The list of modes for each active monitor is checked against the
+    monitor's parameters.  Invalid modes are pruned.
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>PreInit</title>
+
+      <para>
+    This is done at the start of the first server generation only.
+      </para>
+
+      <para>
+    For each <structname>ScrnInfoRec</structname>, enable access to the screens entities and call
+    the <function>ChipPreInit()</function> function.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool ChipPreInit(ScrnInfoRec screen, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      The purpose of this function is to find out all the information
+      required to determine if the configuration is usable, and to
+      initialise those parts of the <structname>ScrnInfoRec</structname> that
+      can be set once at the beginning of the first server generation.
+	    </para>
+
+	    <para>
+      The number of entities registered for the screen should be checked
+      against the expected number (most drivers expect only one).  The
+      entity information for each of them should be retrieved (with
+      <function>xf86GetEntityInfo()</function>) and checked for the correct
+      bus type and that none of the sharable resources registered during
+      the Probe phase was rejected.
+	    </para>
+
+	    <para>
+      Access to resources for the entities that can be controlled in a
+      device-independent way are enabled before this function is called.
+      If the driver needs to access any resources that it has disabled
+      in an <function>EntityInit()</function> function that it registered,
+      then it may enable them here providing that it disables them before
+      this function returns.
+	    </para>
+
+	    <para>
+      This includes probing for video memory, clocks, ramdac, and all
+      other HW info that is needed.  It includes determining the
+      depth/bpp/visual and related info.  It includes validating and
+      determining the set of video modes that will be used (and anything
+      that is required to determine that).
+	    </para>
+
+	    <para>
+      This information should be determined in the least intrusive way
+      possible.  The state of the HW must remain unchanged by this
+      function.  Although video memory (including MMIO) may be mapped
+      within this function, it must be unmapped before returning.  Driver
+      specific information should be stored in a structure hooked into
+      the <structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield>
+      field.  Any other modules which require persistent data (ie data
+      that persists across server generations) should be initialised in
+      this function, and they should allocate a <quote>privates</quote> index to
+      hook their data into by calling
+      <function>xf86AllocateScrnInfoPrivateIndex()</function>.  The <quote>privates</quote>
+      data is persistent.
+	    </para>
+
+	    <para>
+      Helper functions for some of these things are provided at the
+      XFree86 common level, and the driver can choose to make use of
+      them.
+	    </para>
+
+	    <para>
+      All additional resources that the screen needs must be registered
+      here.  This should be done with
+      <function>xf86RegisterResources()</function>.  If some of the fixed
+      resources registered in the Probe phase are not needed or not
+      decoded by the hardware when in the OPERATING server state, their
+      status should be updated with
+      <function>xf86SetOperatingState()</function>.
+	    </para>
+
+	    <para>
+      Modules may be loaded at any point in this function, and all
+      modules that the driver will need must be loaded before the end
+      of this function.  Either the  <function>xf86LoadSubModule()</function>
+      or the <function>xf86LoadDrvSubModule()</function> function should be
+      used to load modules depending on whether a
+      <structname>ScrnInfoRec</structname> has been set up. A driver may unload
+      a module within this function if it was only needed temporarily,
+      and the <function>xf86UnloadSubModule()</function> function should be used
+      to do that.  Otherwise there is no need to explicitly unload modules
+      because the loader takes care of module dependencies and will
+      unload submodules automatically if/when the driver module is
+      unloaded.
+	    </para>
+
+	    <para>
+      The bulk of the <structname>ScrnInfoRec</structname> fields should be filled
+      out in this function.
+	    </para>
+
+	    <para>
+      <function>ChipPreInit()</function> returns <constant>FALSE</constant> when
+      the configuration is unusable in some way (unsupported depth, no
+      valid modes, not enough video memory, etc), and <constant>TRUE</constant>
+      if it is usable.
+	    </para>
+
+	    <para>
+      It is expected that if the <function>ChipPreInit()</function> function
+      returns <constant>TRUE</constant>, then the only reasons that subsequent
+      stages in the driver might fail are lack or resources (like xalloc
+      failures).  All other possible reasons for failure should be
+      determined by the <function>ChipPreInit()</function> function.
+	    </para></blockquote>
+	</para></blockquote>
+
+      <para>
+    The <structname>ScrnInfoRec</structname>s for screens where the <function>ChipPreInit()</function> fails are removed.
+    If none remain, <function>InitOutput()</function> sets <structfield>screenInfo.numScreens</structfield> to <constant>0</constant> and returns.
+      </para>
+
+      <para>
+    At this point, further fields of the <structname>ScrnInfoRec</structname>s would normally be
+    filled in.  Most are not strictly mandatory, but many are required
+    by other layers and/or helper functions that the driver may choose
+    to use.  The documentation for those layers and helper functions
+    indicates which they require.
+      </para>
+
+      <para>
+    The following fields of the <structname>ScrnInfoRec</structname>s should be filled in if the
+    driver is going to use them:
+
+	<literallayout>
+          monitor
+          display
+          depth
+          pixmapBPP
+          bitsPerPixel
+          weight                (&gt;8bpp only)
+          mask                  (&gt;8bpp only)
+          offset                (&gt;8bpp only)
+          rgbBits               (8bpp only)
+          gamma
+          defaultVisual
+          maxHValue
+          maxVValue
+          virtualX
+          virtualY
+          displayWidth
+          frameX0
+          frameY0
+          frameX1
+          frameY1
+          zoomLocked
+          modePool
+          modes
+          currentMode
+          progClock             (TRUE if clock is programmable)
+          chipset
+          ramdac
+          clockchip
+          numClocks             (if not programmable)
+          clock[]               (if not programmable)
+          videoRam
+          biosBase
+          memBase
+          memClk
+          driverPrivate
+          chipID
+          chipRev
+	</literallayout>
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    pointer xf86LoadSubModule(ScrnInfoPtr pScrn, const char *name);
+      and
+    pointer xf86LoadDrvSubModule(DriverPtr drv, const char *name);
+	  </programlisting>
+	  <blockquote><para>
+      Load a module that a driver depends on.  This function loads the
+      module <parameter>name</parameter> as a sub module of the driver.  The
+      return value is a handle identifying the new module.  If the load
+      fails, the return value will be <constant>NULL</constant>.  If a driver
+      needs to explicitly unload a module it has loaded in this way,
+      the return value must be saved and passed to
+      <function>xf86UnloadSubModule()</function> when unloading.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86UnloadSubModule(pointer module);
+	  </programlisting>
+	  <blockquote><para>
+      Unloads the module referenced by <parameter>module</parameter>.
+      <parameter>module</parameter> should be a pointer returned previously
+      by <function>xf86LoadSubModule()</function> or
+      <function>xf86LoadDrvSubModule()</function> .
+
+	    </para></blockquote>
+	</para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Cleaning up Unused Drivers</title>
+
+      <para>
+    At this point it is known which screens will be in use, and which
+    drivers are being used.  Unreferenced drivers (and modules they
+    may have loaded) are unloaded here.
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Consistency Checks</title>
+
+      <para>
+    The parameters that must be global to the server, like pixmap formats,
+    bitmap bit order, bitmap scanline unit and image byte order are
+    compared for each of the screens.  If a mismatch is found, the server
+    exits with an appropriate message.
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Check if Resource Control is Needed</title>
+
+      <para>
+    Determine if resource access control is needed.  This is the case
+    if more than one screen is used.  If necessary the RAC wrapper module
+    is loaded.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>AddScreen (ScreenInit)</title>
+
+      <para>
+    At this point, the valid screens are known.
+    <function>AddScreen()</function> is called for each of them, passing
+    <function>ChipScreenInit()</function> as the argument.
+    <function>AddScreen()</function> is a DIX function that allocates a new
+    <structfield>screenInfo.screen[]</structfield> entry (aka
+    <varname>pScreen</varname>), and does some basic initialisation of it.
+    It then calls the <function>ChipScreenInit()</function> function, with
+    <parameter>pScreen</parameter> as one of its arguments.  If
+    <function>ChipScreenInit()</function> returns <constant>FALSE</constant>,
+    <function>AddScreen()</function> returns <constant>-1</constant>.  Otherwise
+    it returns the index of the screen.  <function>AddScreen()</function>
+    should only fail because of programming errors or failure to allocate
+    resources (like memory).  All configuration problems should be
+    detected BEFORE this point.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool ChipScreenInit(int index, ScreenPtr pScreen,
+                        int argc, char **argv);
+	  </programlisting>
+	  <blockquote><para>
+      This is called at the start of each server generation.
+	    </para>
+
+	    <para>
+      Fill in all of <parameter>pScreen</parameter>, possibly doing some of
+      this by calling ScreenInit functions from other layers like mi,
+      framebuffers (cfb, etc), and extensions.
+	    </para>
+
+	    <para>
+      Decide which operations need to be placed under resource access
+      control.  The classes of operations are the frame buffer operations
+      (<constant>RAC_FB</constant>), the pointer operations
+      (<constant>RAC_CURSOR</constant>), the viewport change operations
+      (<constant>RAC_VIEWPORT</constant>) and the colormap operations
+      (<constant>RAC_COLORMAP</constant>).  Any operation that requires
+      resources which might be disabled during OPERATING state should
+      be set to use RAC.  This can be specified separately for memory
+      and IO resources (the <structfield>racMemFlags</structfield> and
+      <structfield>racIoFlags</structfield> fields of the <structname>ScrnInfoRec</structname>
+      respectively).
+	    </para>
+
+	    <para>
+      Map any video memory or other memory regions.
+	    </para>
+
+	    <para>
+      Save the video card state.  Enough state must be saved so that
+      the original state can later be restored.
+	    </para>
+
+	    <para>
+      Initialise the initial video mode.  The <structname>ScrnInfoRec</structname>'s
+      <structfield>vtSema</structfield> field should be set to <constant>TRUE</constant>
+      just prior to changing the video hardware's state.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+
+      <para>
+    The <function>ChipScreenInit()</function> function (or functions from other
+    layers that it calls) should allocate entries in the
+    <structname>ScreenRec</structname>'s <structfield>devPrivates</structfield> area by
+    calling <function>AllocateScreenPrivateIndex()</function> if it needs
+    per-generation storage.  Since the <structname>ScreenRec</structname>'s
+    <structfield>devPrivates</structfield> information is cleared for each server
+    generation, this is the correct place to initialise it.
+      </para>
+
+      <para>
+    After <function>AddScreen()</function> has successfully returned, the
+    following <structname>ScrnInfoRec</structname> fields are initialised:
+
+	<literallayout>
+          pScreen
+          racMemFlags
+          racIoFlags
+	</literallayout>
+      </para>
+
+      <para>
+    The <function>ChipScreenInit()</function> function should initialise the
+    <structfield>CloseScreen</structfield> and <structfield>SaveScreen</structfield> fields
+    of <parameter>pScreen</parameter>.  The old value of
+    <structfield>pScreen-&gt;CloseScreen</structfield> should be saved as part of
+    the driver's per-screen private data, allowing it to be called from
+    <function>ChipCloseScreen()</function>.  This means that the existing
+    <function>CloseScreen()</function> function is wrapped.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Finalising RAC Initialisation</title>
+
+      <para>
+    After all the <function>ChipScreenInit()</function> functions have been
+    called, each screen has registered its RAC requirements.  This
+    information is used to determine which shared resources are requested
+    by more than one driver and set the access functions accordingly.
+    This is done following these rules:
+
+	<orderedlist>
+	  <listitem><para>
+	The sharable resources registered by each entity are compared.
+	If a resource is registered by more than one entity the entity
+	will be marked to indicate that it needs to share this resources
+	type (IO or MEM).
+	    </para></listitem>
+
+	  <listitem><para>
+        A resource marked <quote>disabled</quote> during OPERATING state will be
+        ignored entirely.
+	    </para></listitem>
+
+	  <listitem><para>
+	A resource marked <quote>unused</quote> will only conflict with an overlapping
+	resource of an other entity if the second is actually in use
+	during OPERATING state.
+	    </para></listitem>
+
+	  <listitem><para>
+	If an <quote>unused</quote> resource was found to conflict but the entity
+	does not use any other resource of this type the entire resource
+	type will be disabled for that entity.
+	    </para></listitem>
+	</orderedlist>
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Finishing InitOutput()</title>
+
+      <para>
+    At this point <function>InitOutput()</function> is finished, and all the
+    screens have been setup in their initial video mode.
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Mode Switching</title>
+
+      <para>
+    When a SwitchMode event is received, <function>ChipSwitchMode()</function>
+    is called (when it exists):
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool ChipSwitchMode(int index, DisplayModePtr mode, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      Initialises the new mode for the screen identified by
+      <parameter>index;</parameter>.  The viewport may need to be adjusted
+      also.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+    </sect2>
+
+    <sect2>
+      <title>Changing Viewport</title>
+
+      <para>
+    When a Change Viewport event is received,
+    <function>ChipAdjustFrame()</function> is called (when it exists):
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    void ChipAdjustFrame(int index, int x, int y, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      Changes the viewport for the screen identified by
+      <parameter>index;</parameter>.
+	    </para>
+
+	    <para>
+      It should be noted that many chipsets impose restrictions on where the
+      viewport may be placed in the virtual resolution, either for alignment
+      reasons, or to prevent the start of the viewport from being positioned
+      within a pixel (as can happen in a 24bpp mode).  After calculating the
+      value the chipset's panning registers need to be set to for non-DGA
+      modes, this function should recalculate the ScrnInfoRec's
+      <structfield>frameX0</structfield>, <structfield>frameY0</structfield>, <structfield>frameX1</structfield>
+      and <structfield>frameY1</structfield> fields to correspond to that value.  If
+      this is not done, switching to another mode might cause the position
+      of a hardware cursor to change.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+    </sect2>
+
+    <sect2>
+      <title>VT Switching</title>
+
+      <para>
+    When a VT switch event is received, <function>xf86VTSwitch()</function>
+    is called.  <function>xf86VTSwitch()</function> does the following:
+
+	<variablelist>
+	  <varlistentry><term>On ENTER:</term>
+	    <listitem>
+	      <itemizedlist>
+		<listitem><para>
+		    enable port I/O access
+		  </para></listitem>
+
+		<listitem><para>
+		    save and initialise the bus/resource state
+		  </para></listitem>
+
+		<listitem><para>
+		    enter the SETUP server state
+		  </para></listitem>
+
+		<listitem><para>
+		    calls <function>ChipEnterVT()</function> for each screen
+		  </para></listitem>
+
+		<listitem><para>
+		    enter the OPERATING server state
+		  </para></listitem>
+
+		<listitem><para>
+		    validate GCs
+		  </para></listitem>
+
+		<listitem><para>
+		    Restore fb from saved pixmap for each screen
+		  </para></listitem>
+
+		<listitem><para>
+		    Enable all input devices
+		  </para></listitem>
+	      </itemizedlist>
+	    </listitem>
+	  </varlistentry>
+	  <varlistentry>
+	    <term>On LEAVE:</term>
+	    <listitem>
+	      <itemizedlist>
+		<listitem><para>
+		    Save fb to pixmap for each screen
+		  </para></listitem>
+
+		<listitem><para>
+		    validate GCs
+		  </para></listitem>
+
+		<listitem><para>
+		    enter the SETUP server state
+		  </para></listitem>
+
+		<listitem><para>
+		    calls <function>ChipLeaveVT()</function> for each screen
+		  </para></listitem>
+
+		<listitem><para>
+		    disable all input devices
+		  </para></listitem>
+
+		<listitem><para>
+		    restore bus/resource state
+		  </para></listitem>
+
+		<listitem><para>
+		    disables port I/O access
+		  </para></listitem>
+	      </itemizedlist>
+	    </listitem>
+	  </varlistentry>
+	</variablelist>
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool ChipEnterVT(int index, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      This function should initialise the current video mode and
+      initialise the viewport, turn on the HW cursor if appropriate,
+      etc.
+	    </para>
+
+	    <para>
+      Should it re-save the video state before initialising the video
+      mode?
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void ChipLeaveVT(int index, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      This function should restore the saved video state.  If
+      appropriate it should also turn off the HW cursor, and invalidate
+      any pixmap/font caches.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <para>
+    Optionally, <function>ChipLeaveVT()</function> may also unmap memory
+    regions.  If so, <function>ChipEnterVT()</function> will need to remap
+    them.  Additionally, if an aperture used to access video memory is
+    unmapped and remapped in this fashion, <function>ChipEnterVT()</function>
+    will also need to notify the framebuffer layers of the aperture's new
+    location in virtual memory.  This is done with a call to the screen's
+    <function>ModifyPixmapHeader()</function> function, as follows
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    (*pScreen-&gt;ModifyPixmapHeader)(pScrn-&gt;ppix,
+                                   -1, -1, -1, -1, -1, NewApertureAddress);
+	  </programlisting>
+	  <blockquote><para>
+        where the <structfield>ppix</structfield> field in a ScrnInfoRec
+        points to the pixmap used by the screen's
+        <function>SaveRestoreImage()</function> function to hold the screen's
+        contents while switched out.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <para>
+    Other layers may wrap the <function>ChipEnterVT()</function> and
+    <function>ChipLeaveVT()</function> functions if they need to take some
+    action when these events are received.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>End of server generation</title>
+
+      <para>
+    At the end of each server generation, the DIX layer calls
+    <function>ChipCloseScreen()</function> for each screen:
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool ChipCloseScreen(int index, ScreenPtr pScreen);
+	  </programlisting>
+	  <blockquote><para>
+      This function should restore the saved video state and unmap the
+      memory regions.
+	    </para>
+
+	    <para>
+      It should also free per-screen data structures allocated by the
+      driver.  Note that the persistent data held in the
+      <structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield> field
+      should not be freed here because it is needed by subsequent server
+      generations.
+	    </para>
+
+	    <para>
+      The <structname>ScrnInfoRec</structname>'s <structfield>vtSema</structfield> field
+      should be set to <constant>FALSE</constant> once the video HW state
+      has been restored.
+	    </para>
+
+	    <para>
+      Before freeing the per-screen driver data the saved
+      <structfield>CloseScreen</structfield> value should be restored to
+      <structfield>pScreen-&gt;CloseScreen</structfield>, and that function should
+      be called after freeing the data.
+
+	    </para></blockquote>
+	</para></blockquote>
+    </sect2>
+  </sect1>
+
+  <sect1>
+    <title>Optional Driver Functions</title>
+
+    <para>
+The functions outlined here can be called from the XFree86 common layer,
+but their presence is optional.
+    </para>
+
+    <sect2>
+      <title>Mode Validation</title>
+
+      <para>
+    When a mode validation helper supplied by the XFree86-common layer is
+    being used, it can be useful to provide a function to check for hw
+    specific mode constraints:
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    ModeStatus ChipValidMode(int index, DisplayModePtr mode,
+                             Bool verbose, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      Check the passed mode for hw-specific constraints, and return the
+      appropriate status value.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+      <para>
+This function may also modify the effective timings and clock of the passed
+mode.  These have been stored in the mode's <structfield>Crtc*</structfield> and
+<structfield>SynthClock</structfield> elements, and have already been adjusted for
+interlacing, doublescanning, multiscanning and clock multipliers and dividers.
+The function should not modify any other mode field, unless it wants to modify
+the mode timings reported to the user by <function>xf86PrintModes()</function>.
+      </para>
+
+      <para>
+The function is called once for every mode in the xorg.conf Monitor section
+assigned to the screen, with <parameter>flags</parameter> set to
+<constant>MODECHECK_INITIAL</constant>.  It is subsequently called for every mode
+in the xorg.conf Display subsection assigned to the screen, with
+<parameter>flags</parameter> set to <constant>MODECHECK_FINAL</constant>.  In the second
+case, the mode will have successfully passed all other tests.  In addition,
+the <structname>ScrnInfoRec</structname>'s <structfield>virtualX</structfield>,
+<structfield>virtualY</structfield> and <structfield>displayWidth</structfield> fields will have been
+set as if the mode to be validated were to be the last mode accepted.
+      </para>
+
+      <para>
+In effect, calls with MODECHECK_INITIAL are intended for checks that do not
+depend on any mode other than the one being validated, while calls with
+MODECHECK_FINAL are intended for checks that may involve more than one mode.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Free screen data</title>
+
+      <para>
+    When a screen is deleted prior to the completion of the ScreenInit
+    phase the <function>ChipFreeScreen()</function> function is called when defined.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    void ChipFreeScreen(int scrnindex, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      Free any driver-allocated data that may have been allocated up to
+      and including an unsuccessful <function>ChipScreenInit()</function>
+      call.  This would predominantly be data allocated by
+      <function>ChipPreInit()</function> that persists across server
+      generations.  It would include the <structfield>driverPrivate</structfield>,
+      and any <quote>privates</quote> entries that modules may have allocated.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+    </sect2>
+</sect1>
+
+  <sect1>
+    <title>Recommended driver functions</title>
+
+    <para>
+The functions outlined here are for internal use by the driver only.
+They are entirely optional, and are never accessed directly from higher
+layers.  The sample function declarations shown here are just examples.
+The interface (if any) used is up to the driver.
+    </para>
+
+    <sect2>
+      <title>Save</title>
+
+      <para>
+    Save the video state.  This could be called from <function>ChipScreenInit()</function> and
+    (possibly) <function>ChipEnterVT()</function>.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    void ChipSave(ScrnInfoPtr pScrn);
+	  </programlisting>
+	  <blockquote><para>
+      Saves the current state.  This will only be saving pre-server
+      states or states before returning to the server.  There is only
+      one current saved state per screen and it is stored in private
+      storage in the screen.
+
+	    </para></blockquote>
+	</para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Restore</title>
+
+      <para>
+    Restore the original video state.  This could be called from the
+    <function>ChipLeaveVT()</function> and <function>ChipCloseScreen()</function>
+    functions.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    void ChipRestore(ScrnInfoPtr pScrn);
+	  </programlisting>
+	  <blockquote><para>
+      Restores the saved state from the private storage.  Usually only
+      used for restoring text modes.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+    </sect2>
+
+    <sect2>
+      <title>Initialise Mode</title>
+
+      <para>
+    Initialise a video mode.  This could be called from the
+    <function>ChipScreenInit()</function>, <function>ChipSwitchMode()</function>
+    and <function>ChipEnterVT()</function> functions.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool ChipModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode);
+	  </programlisting>
+	  <blockquote><para>
+      Programs the hardware for the given video mode.
+
+	    </para></blockquote>
+	</para></blockquote>
+
+    </sect2>
+  </sect1>
+
+  <sect1>
+    <title>Data and Data Structures</title>
+
+    <sect2>
+      <title>Command line data</title>
+
+      <para>
+Command line options are typically global, and are stored in global
+variables.  These variables are read-only and are available to drivers
+via a function call interface.  Most of these command line values are
+processed via helper functions to ensure that they are treated consistently
+by all drivers.  The other means of access is provided for cases where
+the supplied helper functions might not be appropriate.
+      </para>
+
+      <para>
+Some of them are:
+
+	<literallayout>
+    xf86Verbose               verbosity level
+    xf86Bpp                   -bpp from the command line
+    xf86Depth                 -depth from the command line
+    xf86Weight                -weight from the command line
+    xf86Gamma                 -{r,g,b,}gamma from the command line
+    xf86FlipPixels            -flippixels from the command line
+    xf86ProbeOnly             -probeonly from the command line
+    defaultColorVisualClass   -cc from the command line
+	</literallayout>
+      </para>
+
+      <para>
+If we ever do allow for screen-specific command line options, we may
+need to rethink this.
+      </para>
+
+      <para>
+These can be accessed in a read-only manner by drivers with the following
+functions:
+      </para>
+
+     <blockquote><para>
+	  <programlisting>
+    int xf86GetVerbosity();
+	  </programlisting>
+	  <blockquote><para>
+      Returns the value of <varname>xf86Verbose</varname>.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+     <blockquote><para>
+	  <programlisting>
+    int xf86GetDepth();
+	  </programlisting>
+	  <blockquote><para>
+      Returns the <option>-depth</option> command line setting.  If not
+      set on the command line, <constant>-1</constant> is returned.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+     <blockquote><para>
+	  <programlisting>
+    rgb xf86GetWeight();
+	  </programlisting>
+	  <blockquote><para>
+      Returns the <option>-weight</option> command line setting.  If not
+      set on the command line, <literal remap="tt">{0, 0, 0}</literal> is returned.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Gamma xf86GetGamma();
+	  </programlisting>
+	  <blockquote><para>
+      Returns the <option>-gamma</option> or <option>-rgamma</option>,
+      <option>-ggamma</option>, <option>-bgamma</option> command line settings.
+      If not set on the command line, <literal remap="tt">{0.0, 0.0, 0.0}</literal>
+      is returned.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86GetFlipPixels();
+	  </programlisting>
+	  <blockquote><para>
+      Returns <constant>TRUE</constant> if <option>-flippixels</option> is
+      present on the command line, and <constant>FALSE</constant> otherwise.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    const char *xf86GetServerName();
+	  </programlisting>
+	  <blockquote><para>
+      Returns the name of the X server from the command line.
+	    </para></blockquote>
+
+	</para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Data handling</title>
+
+      <para>
+Config file data contains parts that are global, and parts that are
+Screen specific.  All of it is parsed into data structures that neither
+the drivers or most other parts of the server need to know about.
+      </para>
+
+      <para>
+The global data is typically not required by drivers, and as such, most
+of it is stored in the private <structname>xf86InfoRec</structname>.
+      </para>
+
+      <para>
+The screen-specific data collected from the config file is stored in
+screen, device, display, monitor-specific data structures that are separate
+from the <varname>ScrnInfoRecs</varname>, with the appropriate elements/fields
+hooked into the <varname>ScrnInfoRecs</varname> as required.  The screen
+config data is held in <structname>confScreenRec</structname>, device data in
+the <structname>GDevRec</structname>, monitor data in the <structname>MonRec</structname>,
+and display data in the <structname>DispRec</structname>.
+      </para>
+
+      <para>
+The XFree86 common layer's screen specific data (the actual data in use
+for each screen) is held in the <varname>ScrnInfoRecs</varname>.  As has
+been outlined above, the <varname>ScrnInfoRecs</varname> are allocated at probe
+time, and it is the responsibility of the Drivers' <function>Probe()</function>
+and <function>PreInit()</function> functions to finish filling them in based
+on both data provided on the command line and data provided from the
+Config file.  The precedence for this is:
+
+	<blockquote><para>
+    command line  -&gt;  config file  -&gt;  probed/default data
+	</para></blockquote>
+      </para>
+
+      <para>
+For most things in this category there are helper functions that the
+drivers can use to ensure that the above precedence is consistently
+used.
+      </para>
+
+      <para>
+As well as containing screen-specific data that the XFree86 common layer
+(including essential parts of the server infrastructure as well as helper
+functions) needs to access, it also contains some data that drivers use
+internally.  When considering whether to add a new field to the
+<structname>ScrnInfoRec</structname>, consider the balance between the convenience
+of things that lots of drivers need and the size/obscurity of the
+<structname>ScrnInfoRec</structname>.
+      </para>
+
+      <para>
+Per-screen driver specific data that cannot be accommodated with the
+static <structname>ScrnInfoRec</structname> fields is held in a driver-defined
+data structure, a pointer to which is assigned to the
+<structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield> field.  This
+is per-screen data that persists across server generations (as does the
+bulk of the static <structname>ScrnInfoRec</structname> data).  It would typically
+also include the video card's saved state.
+      </para>
+
+      <para>
+Per-screen data for other modules that the driver uses (for example,
+the XAA module) that is reset for each server generation is hooked into
+the <structname>ScrnInfoRec</structname> through it's <structfield>privates</structfield>
+field.
+      </para>
+
+      <para>
+Once it has stabilised, the data structures and variables accessible to
+video drivers will be documented here.  In the meantime, those things
+defined in the <filename>xf86.h</filename> and <filename>xf86str.h</filename>
+files are visible to video drivers.  Things defined in
+<filename>xf86Priv.h</filename> and <filename>xf86Privstr.h</filename> are NOT
+intended to be visible to video drivers, and it is an error for a driver
+to include those files.
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Accessing global data</title>
+
+      <para>
+Some other global state information that the drivers may access via
+functions is as follows:
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86ServerIsExiting();
+	  </programlisting>
+	  <blockquote><para>
+      Returns <constant>TRUE</constant> if the server is at the end of a
+      generation and is in the process of exiting, and
+      <constant>FALSE</constant> otherwise.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86ServerIsResetting();
+	  </programlisting>
+	  <blockquote><para>
+      Returns <constant>TRUE</constant> if the server is at the end of a
+      generation and is in the process of resetting, and
+      <constant>FALSE</constant> otherwise.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86ServerIsInitialising();
+	  </programlisting>
+	  <blockquote><para>
+      Returns <constant>TRUE</constant> if the server is at the beginning of
+      a generation and is in the process of initialising, and
+      <constant>FALSE</constant> otherwise.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86ServerIsOnlyProbing();
+	  </programlisting>
+	  <blockquote><para>
+      Returns <constant>TRUE</constant> if the -probeonly command line flag
+      was specified, and <constant>FALSE</constant> otherwise.
+	    </para></blockquote>
+
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86CaughtSignal();
+	  </programlisting>
+	  <blockquote><para>
+      Returns <constant>TRUE</constant> if the server has caught a signal,
+      and <constant>FALSE</constant> otherwise.
+	    </para></blockquote>
+
+	</para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Allocating private data</title>
+
+      <para>
+A driver and any module it uses may allocate per-screen private storage
+in either the <structname>ScreenRec</structname> (DIX level) or
+<structname>ScrnInfoRec</structname> (XFree86 common layer level).
+<structname>ScreenRec</structname> storage persists only for a single server
+generation, and <structname>ScrnInfoRec</structname> storage persists across
+generations for the lifetime of the server.
+      </para>
+
+      <para>
+The <structname>ScreenRec</structname> <structfield>devPrivates</structfield> data must be
+reallocated/initialised at the start of each new generation.  This is
+normally done from the <function>ChipScreenInit()</function> function, and
+Init functions for other modules that it calls.  Data allocated in this
+way should be freed by the driver's <function>ChipCloseScreen()</function>
+functions, and Close functions for other modules that it calls.  A new
+<structfield>devPrivates</structfield> entry is allocated by calling the
+<function>AllocateScreenPrivateIndex()</function> function.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    int AllocateScreenPrivateIndex();
+	  </programlisting>
+	  <blockquote><para>
+      This function allocates a new element in the
+      <structfield>devPrivates</structfield> field of all currently existing
+      <literal remap="tt">ScreenRecs</literal>.  The return value is the index of this
+      new element in the <structfield>devPrivates</structfield> array.  The
+      <structfield>devPrivates</structfield> field is of type
+      <structname>DevUnion</structname>:
+
+	      <programlisting>
+        typedef union _DevUnion {
+            pointer             ptr;
+            long                val;
+            unsigned long       uval;
+            pointer             (*fptr)(void);
+        } DevUnion;
+	      </programlisting>
+
+      which allows the element to be used for any of the above types.
+      It is commonly used as a pointer to data that the caller allocates
+      after the new index has been allocated.
+	    </para>
+
+	    <para>
+      This function will return <constant>-1</constant> when there is an
+      error allocating the new index.
+	    </para>
+
+	  </blockquote>
+	</para></blockquote>
+
+      <para>
+The <structname>ScrnInfoRec</structname> <structfield>privates</structfield> data persists
+for the life of the server, so only needs to be allocated once.  This
+should be done from the <function>ChipPreInit()</function> function, and Init
+functions for other modules that it calls.  Data allocated in this way
+should be freed by the driver's <function>ChipFreeScreen()</function> functions,
+and Free functions for other modules that it calls.  A new
+<structfield>privates</structfield> entry is allocated by calling the
+<function>xf86AllocateScrnInfoPrivateIndex()</function> function.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    int xf86AllocateScrnInfoPrivateIndex();
+	  </programlisting>
+	  <blockquote><para>
+      This function allocates a new element in the <structfield>privates</structfield>
+      field of all currently existing <varname>ScrnInfoRecs</varname>.
+      The return value is the index of this new element in the
+      <structfield>privates</structfield> array.  The <structfield>privates</structfield>
+      field is of type <structfield>DevUnion</structfield>:
+
+	      <programlisting>
+        typedef union _DevUnion {
+            pointer             ptr;
+            long                val;
+            unsigned long       uval;
+            pointer             (*fptr)(void);
+        } DevUnion;
+	      </programlisting>
+
+      which allows the element to be used for any of the above types.
+      It is commonly used as a pointer to data that the caller allocates
+      after the new index has been allocated.
+	    </para>
+
+	    <para>
+      This function will not return when there is an error allocating
+      the new index.  When there is an error it will cause the server
+      to exit with a fatal error.  The similar function for allocation
+      privates in the <structname>ScreenRec</structname>
+      (<function>AllocateScreenPrivateIndex()</function>) differs in this
+      respect by returning <constant>-1</constant> when the allocation fails.
+	    </para>
+
+	  </blockquote>
+	</para></blockquote>
+    </sect2>
+  </sect1>
+
+  <sect1 id="rac">
+    <title>Keeping Track of Bus Resources</title>
+
+    <sect2>
+      <title>Theory of Operation</title>
+
+      <para>
+The XFree86 common layer has knowledge of generic access control mechanisms
+for devices on certain bus systems (currently the PCI bus) as well as
+of methods to enable or disable access to the buses itself.  Furthermore
+it can access information on resources decoded by these devices and if
+necessary modify it.
+      </para>
+
+      <para>
+When first starting the Xserver collects all this information, saves it
+for restoration, checks it for consistency, and if necessary, corrects
+it.  Finally it disables all resources on a generic level prior to
+calling any driver function.
+      </para>
+
+      <para>
+When the <function>Probe()</function> function of each driver is called the
+device sections are matched against the devices found in the system.
+The driver may probe devices at this stage that cannot be identified by
+using device independent methods.  Access to all resources that can be
+controlled in a device independent way is disabled.  The
+<function>Probe()</function> function should register all non-relocatable
+resources at this stage.  If a resource conflict is found between
+exclusive resources the driver will fail immediately.  Optionally the
+driver might specify an <function>EntityInit()</function>,
+<function>EntityLeave()</function> and <function>EntityEnter()</function> function.
+      </para>
+
+      <para>
+<function>EntityInit()</function> can be used to disable any shared resources
+that are not controlled by the generic access control functions.  It is
+called prior to the PreInit phase regardless if an entity is active or
+not.  When calling the <function>EntityInit()</function>,
+<function>EntityEnter()</function> and <function>EntityLeave()</function> functions
+the common level will disable access to all other entities on a generic
+level.  Since the common level has no knowledge of device specific
+methods to disable access to resources it cannot be guaranteed that
+certain resources are not decoded by any other entity until the
+<function>EntityInit()</function> or <function>EntityEnter()</function> phase is
+finished.  Device drivers should therefore register all those resources
+which they are going to disable.  If these resources are never to be
+used by any driver function they may be flagged <constant>ResInit</constant>
+so that they can be removed from the resource list after processing all
+<function>EntityInit()</function> functions.  <function>EntityEnter()</function>
+should disable decoding of all resources which are not registered as
+exclusive and which are not handled by the generic access control in
+the common level.  The difference to <function>EntityInit()</function> is
+that the latter one is only called once during lifetime of the server.
+It can therefore be used to set up variables prior to disabling resources.
+<function>EntityLeave()</function> should restore the original state when
+exiting the server or switching to a different VT.  It also needs to
+disable device specific access functions if they need to be disabled on
+server exit or VT switch.  The default state is to enable them before
+giving up the VT.
+      </para>
+
+      <para>
+In <function>PreInit()</function> phase each driver should check if any
+sharable resources it has registered during <function>Probe()</function> has
+been denied and take appropriate action which could simply be to fail.
+If it needs to access resources it has disabled during
+<function>EntitySetup()</function> it can do so provided it has registered
+these and will disable them before returning from
+<function>PreInit()</function>.  This also applies to all other driver
+functions.  Several functions are provided to request resource ranges,
+register these, correct PCI config space and add replacements for the
+generic access functions.  Resources may be marked <quote>disabled</quote> or
+<quote>unused</quote> during OPERATING stage.  Although these steps could also be
+performed in <function>ScreenInit()</function>, this is not desirable.
+      </para>
+
+      <para>
+Following <function>PreInit()</function> phase the common level determines
+if resource access control is needed.  This is the case if more than
+one screen is used.  If necessary the RAC wrapper module is loaded.  In
+<function>ScreenInit()</function> the drivers can decide which operations
+need to be placed under RAC.  Available are the frame buffer operations,
+the pointer operations and the colormap operations.  Any operation that
+requires resources which might be disabled during OPERATING state should
+be set to use RAC.  This can be specified separately for memory and IO
+resources.
+      </para>
+
+      <para>
+When <function>ScreenInit()</function> phase is done the common level will
+determine which shared resources are requested by more than one driver
+and set the access functions accordingly.  This is done following these
+rules:
+
+	<orderedlist>
+	  <listitem><para>
+   The sharable resources registered by each entity are compared.  If
+   a resource is registered by more than one entity the entity will be
+   marked to need to share this resources type (<constant>IO</constant> or
+   <constant>MEM</constant>).
+	    </para></listitem>
+
+	  <listitem><para>
+   A resource marked <quote>disabled</quote> during OPERATING state will be ignored
+   entirely.
+	    </para></listitem>
+
+	  <listitem><para>
+   A resource marked <quote>unused</quote> will only conflicts with an overlapping
+   resource of an other entity if the second is actually in use during
+   OPERATING state.
+	    </para></listitem>
+
+	  <listitem><para>
+   If an <quote>unused</quote> resource was found to conflict however the entity
+   does not use any other resource of this type the entire resource type
+   will be disabled for that entity.
+	    </para></listitem>
+	</orderedlist>
+      </para>
+
+      <para>
+The driver has the choice among different ways to control access to
+certain resources:
+
+	<orderedlist>
+	  <listitem><para>
+   It can rely on the generic access functions.  This is probably the
+   most common case.  Here the driver only needs to register any resource
+   it is going to use.
+	    </para></listitem>
+
+	  <listitem><para>
+   It can replace the generic access functions by driver specific
+   ones.  This will mostly be used in cases where no generic access
+   functions are available.  In this case the driver has to make sure
+   these resources are disabled when entering the <function>PreInit()</function>
+   stage.  Since the replacement functions are registered in
+   <function>PreInit()</function> the driver will have to enable these
+   resources itself if it needs to access them during this state.  The
+   driver can specify if the replacement functions can control memory
+   and/or I/O resources separately.
+	    </para></listitem>
+
+	  <listitem><para>
+   The driver can enable resources itself when it needs them.  Each
+   driver function enabling them needs to disable them before it will
+   return.  This should be used if a resource which can be controlled
+   in a device dependent way is only required during SETUP state.  This
+   way it can be marked <quote>unused</quote> during OPERATING state.
+	    </para></listitem>
+	</orderedlist>
+      </para>
+
+      <para>
+A resource which is decoded during OPERATING state however never accessed
+by the driver should be marked unused.
+      </para>
+
+      <para>
+Since access switching latencies are an issue during Xserver operation,
+the common level attempts to minimize the number of entities that need
+to be placed under RAC control.  When a wrapped operation is called,
+the <function>EnableAccess()</function> function is called before control is
+passed on.  <function>EnableAccess()</function> checks if a screen is under
+access control.  If not it just establishes bus routing and returns.
+If the screen needs to be under access control,
+<function>EnableAccess()</function> determines which resource types
+(<literal remap="tt">MEM</literal>, <literal remap="tt">IO</literal>) are required.  Then it tests
+if this access is already established.  If so it simply returns.  If
+not it disables the currently established access, fixes bus routing and
+enables access to all entities registered for this screen.
+      </para>
+
+      <para>
+Whenever a mode switch or a VT-switch is performed the common level will
+return to SETUP state.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Resource Types</title>
+
+      <para>
+Resource have certain properties.  When registering resources each range
+is accompanied by a flag consisting of the ORed flags of the different
+properties the resource has.  Each resource range may be classified
+according to
+
+	<itemizedlist>
+	  <listitem><para>
+       its physical properties i.e., if it addresses
+       memory (<constant>ResMem</constant>)  or
+       I/O space (<constant>ResIo</constant>),
+	    </para></listitem>
+	  <listitem><para>
+       if it addresses a
+       block (<constant>ResBlock</constant>) or
+       sparse (<constant>ResSparse</constant>)
+       range,
+	    </para></listitem>
+	  <listitem><para>
+       its access properties.
+	    </para></listitem>
+	</itemizedlist>
+      </para>
+
+      <para>
+There are two known access properties:
+
+	<itemizedlist>
+	  <listitem><para>
+  <constant>ResExclusive</constant>
+    for resources which may not be shared with any other device and
+	    </para></listitem>
+	  <listitem><para>
+  <constant>ResShared</constant>
+    for resources which can be disabled and therefore can be shared.
+	    </para></listitem>
+	</itemizedlist>
+      </para>
+
+      <para>
+If it is necessary to test a resource against any type a generic access
+type <constant>ResAny</constant> is provided.  If this is set the resource
+will conflict with any resource of a different entity intersecting its
+range.  Further it can be specified that a resource is decoded however
+never used during any stage (<constant>ResUnused</constant>) or during
+OPERATING state (<constant>ResUnusedOpr</constant>).  A resource only visible
+during the init functions (ie.  <function>EntityInit()</function>,
+<function>EntityEnter()</function> and <function>EntityLeave()</function> should
+be registered with the flag <constant>ResInit</constant>.  A resource that
+might conflict with background resource ranges may be flagged with
+<constant>ResBios</constant>.  This might be useful when registering resources
+ranges that were assigned by the system Bios.
+      </para>
+
+      <para>
+Several predefined resource lists are available for VGA and 8514/A
+resources in <filename>common/xf86Resources.h</filename>.
+      </para>
+    </sect2>
+
+    <sect2 id="avail">
+      <title>Available Functions</title>
+
+      <para>
+The functions provided for resource management are listed in their order
+of use in the driver.
+      </para>
+
+      <sect3>
+	<title>Probe Phase</title>
+
+	<para>
+In this phase each driver detects those resources it is able to drive,
+creates an entity record for each of them, registers non-relocatable
+resources and allocates screens and adds the resources to screens.
+	</para>
+
+	<para>
+Two helper functions are provided for matching device sections in the
+xorg.conf file to the devices:
+	</para>
+
+	<blockquote><para>
+	    <programlisting>
+    int xf86MatchPciInstances(const char *driverName, int vendorID,
+                              SymTabPtr chipsets, PciChipsets *PCIchipsets,
+                              GDevPtr *devList, int numDevs, DriverPtr drvp,
+                              int **foundEntities);
+	    </programlisting>
+	    <blockquote><para>
+      This function finds matches between PCI cards that a driver supports
+      and config file device sections.  It is intended for use in the
+      <function>ChipProbe()</function> function of drivers for PCI cards.
+      Only probed PCI devices with a vendor ID matching
+      <parameter>vendorID</parameter> are considered.  <parameter>devList</parameter>
+      and <parameter>numDevs</parameter> are typically those found from
+      calling <function>xf86MatchDevice()</function>, and represent the active
+      config file device sections relevant to the driver.
+      <parameter>PCIchipsets</parameter> is a table that provides a mapping
+      between the PCI device IDs, the driver's internal chipset tokens
+      and a list of fixed resources.
+	      </para>
+
+	      <para>
+      When a device section doesn't have a <emphasis>BusID</emphasis> entry it
+      can only match the primary video device.  Secondary devices are
+      only matched with device sections that have a matching
+      <emphasis>BusID</emphasis> entry.
+	      </para>
+
+	      <para>
+      Once the preliminary matches have been found, a final match is
+      confirmed by checking if the chipset override, ChipID override or
+      probed PCI chipset type match one of those given in the
+      <parameter>chipsets</parameter> and <parameter>PCIchipsets</parameter> lists.
+      The <parameter>PCIchipsets</parameter> list includes a list of the PCI
+      device IDs supported by the driver.  The list should be terminated
+      with an entry with PCI ID <constant>-1</constant>".  The
+      <parameter>chipsets</parameter> list is a table mapping the driver's
+      internal chipset tokens to names, and should be terminated with
+      a <constant>NULL</constant> entry.  Only those entries with a
+      corresponding entry in the <parameter>PCIchipsets</parameter> list are
+      considered.  The order of precedence is: config file chipset,
+      config file ChipID, probed PCI device ID.
+	      </para>
+
+	      <para>
+      In cases where a driver handles PCI chipsets with more than one
+      vendor ID, it may set <parameter>vendorID</parameter> to
+      <constant>0</constant>, and OR each devID in the list with (the
+      vendor&nbsp;ID&nbsp;&lt;&lt;&nbsp;16).
+	      </para>
+
+	      <para>
+      Entity index numbers for confirmed matches are returned as an
+      array via <parameter>foundEntities</parameter>.  The PCI information,
+      chipset token and device section for each match are found in the
+      <structname>EntityInfoRec</structname> referenced by the indices.
+	      </para>
+
+	      <para>
+      The function return value is the number of confirmed matches.  A
+      return value of <constant>-1</constant> indicates an internal error.
+      The returned <parameter>foundEntities</parameter> array should be freed
+      by the driver with <function>xfree()</function> when it is no longer
+      needed in cases where the return value is greater than zero.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    int xf86MatchIsaInstances(const char *driverName,
+                              SymTabPtr chipsets, IsaChipsets *ISAchipsets,
+                              DriverPtr drvp, FindIsaDevProc FindIsaDevice,
+                              GDevPtr *devList, int numDevs,
+                              int **foundEntities);
+	    </programlisting>
+	    <blockquote><para>
+      This function finds matches between ISA cards that a driver supports
+      and config file device sections.  It is intended for use in the
+      <function>ChipProbe()</function> function of drivers for ISA cards.
+      <parameter>devList</parameter> and <parameter>numDevs</parameter> are
+      typically those found from calling <function>xf86MatchDevice()</function>,
+      and represent the active config file device sections relevant to
+      the driver.  <parameter>ISAchipsets</parameter> is a table that provides
+      a mapping between the driver's internal chipset tokens and the
+      resource classes.  <parameter>FindIsaDevice</parameter> is a
+      driver-provided function that probes the hardware and returns the
+      chipset token corresponding to what was detected, and
+      <constant>-1</constant> if nothing was detected.
+	      </para>
+
+	      <para>
+      If the config file device section contains a chipset entry, then
+      it is checked against the <parameter>chipsets</parameter> list.  When
+      no chipset entry is present, the <parameter>FindIsaDevice</parameter>
+      function is called instead.
+	      </para>
+
+	      <para>
+      Entity index numbers for confirmed matches are returned as an
+      array via <parameter>foundEntities</parameter>.  The chipset token and
+      device section for each match are found in the
+      <structname>EntityInfoRec</structname> referenced by the indices.
+	      </para>
+
+	      <para>
+      The function return value is the number of confirmed matches.  A
+      return value of <constant>-1</constant> indicates an internal error.
+      The returned <parameter>foundEntities</parameter> array should be freed
+      by the driver with <function>xfree()</function> when it is no longer
+      needed in cases where the return value is greater than zero.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<para>
+These two helper functions make use of several core functions that are
+available at the driver level:
+	</para>
+
+	<blockquote><para>
+	    <programlisting>
+    Bool xf86ParsePciBusString(const char *busID, int *bus,
+                               int *device, int *func);
+	    </programlisting>
+	    <blockquote><para>
+      Takes a <parameter>BusID</parameter> string, and if it is in the correct
+      format, returns the PCI <parameter>bus</parameter>, <parameter>device</parameter>,
+      <parameter>func</parameter> values that it indicates.  The format of the
+      string is expected to be "PCI:bus:device:func" where each of <quote>bus</quote>,
+      <quote>device</quote> and <quote>func</quote> are decimal integers.  The ":func" part may
+      be omitted, and the func value assumed to be zero, but this isn't
+      encouraged.  The "PCI" prefix may also be omitted.  The prefix
+      "AGP" is currently equivalent to the "PCI" prefix.  If the string
+      isn't a valid PCI BusID, the return value is <constant>FALSE</constant>.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    Bool xf86ComparePciBusString(const char *busID, int bus,
+                                 int device, int func);
+	    </programlisting>
+	    <blockquote><para>
+      Compares a <parameter>BusID</parameter> string with PCI <parameter>bus</parameter>,
+      <parameter>device</parameter>, <parameter>func</parameter> values.  If they
+      match <constant>TRUE</constant> is returned, and <constant>FALSE</constant>
+      if they don't.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    Bool xf86ParseIsaBusString(const char *busID);
+	    </programlisting>
+	    <blockquote><para>
+      Compares a <parameter>BusID</parameter> string with the ISA bus ID string
+      ("ISA" or "ISA:").  If they match <constant>TRUE</constant> is returned,
+      and <constant>FALSE</constant> if they don't.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    Bool xf86CheckPciSlot(int bus, int device, int func);
+	    </programlisting>
+	    <blockquote><para>
+      Checks if the PCI slot <literal remap="tt">bus:device:func</literal> has been
+      claimed.  If so, it returns <constant>FALSE</constant>, and otherwise
+      <constant>TRUE</constant>.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    int xf86ClaimPciSlot(int bus, int device, int func, DriverPtr drvp,
+                         int chipset, GDevPtr dev, Bool active);
+	    </programlisting>
+	    <blockquote><para>
+      This function is used to claim a PCI slot, allocate the associated
+      entity record and initialise their data structures.  The return
+      value is the index of the newly allocated entity record, or
+      <constant>-1</constant> if the claim fails.  This function should always
+      succeed if <function>xf86CheckPciSlot()</function> returned
+      <constant>TRUE</constant> for the same PCI slot.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    Bool xf86IsPrimaryPci(void);
+	    </programlisting>
+	    <blockquote><para>
+      This function returns <constant>TRUE</constant> if the primary card is
+      a PCI device, and <constant>FALSE</constant> otherwise.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    int xf86ClaimIsaSlot(DriverPtr drvp, int chipset,
+                         GDevPtr dev, Bool active);
+	    </programlisting>
+	    <blockquote><para>
+      This allocates an entity record entity and initialise the data
+      structures.  The return value is the index of the newly allocated
+      entity record.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    Bool xf86IsPrimaryIsa(void);
+	    </programlisting>
+	    <blockquote><para>
+      This function returns <constant>TRUE</constant> if the primary card is
+      an ISA (non-PCI) device, and <constant>FALSE</constant> otherwise.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<para>
+Two helper functions are provided to aid configuring entities:
+	</para>
+
+	<blockquote><para>
+	    <programlisting>
+    ScrnInfoPtr xf86ConfigPciEntity(ScrnInfoPtr pScrn,
+                                    int scrnFlag, int entityIndex,
+                                    PciChipsets *p_chip,
+                                    resList res, EntityProc init,
+                                    EntityProc enter, EntityProc leave,
+                                    pointer private);
+
+    ScrnInfoPtr xf86ConfigIsaEntity(ScrnInfoPtr pScrn,
+                                    int scrnFlag, int entityIndex,
+                                    IsaChipsets *i_chip,
+                                    resList res, EntityProc init,
+                                    EntityProc enter, EntityProc leave,
+                                    pointer private);
+	    </programlisting>
+	    <blockquote><para>
+      These functions are used to register the non-relocatable resources
+      for an entity, and the optional entity-specific <parameter>Init</parameter>, <parameter>Enter</parameter> and
+      <parameter>Leave</parameter> functions.  Usually the list of fixed resources is obtained
+      from the Isa/PciChipsets lists.  However an additional list of
+      resources may be passed.  Generally this is not required.
+      For active entities a <structname>ScrnInfoRec</structname> is allocated
+      if the <parameter>pScrn</parameter> argument is <constant>NULL</constant>.
+The
+      return value is <constant>TRUE</constant> when successful.  The init, enter, leave
+      functions are defined as follows:
+
+		<blockquote><para>
+		    <programlisting>
+        typedef void (*EntityProc)(int entityIndex,
+                                   pointer private);
+		    </programlisting>
+		  </para></blockquote>
+
+      They are passed the entity index and a pointer to a private scratch
+      area.  This can be set up during <function>Probe()</function> and
+      its address can be passed to
+      <function>xf86ConfigIsaEntity()</function> and
+      <function>xf86ConfigPciEntity()</function> as the last argument.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<para>
+These two helper functions make use of several core functions that are
+available at the driver level:
+
+	  <blockquote><para>
+	      <programlisting>
+    void xf86ClaimFixedResources(resList list, int entityIndex);
+	      </programlisting>
+	      <blockquote><para>
+      This function registers the non-relocatable resources which cannot
+      be disabled and which therefore would cause the server to fail
+      immediately if they were found to conflict.  It also records
+      non-relocatable but sharable resources for processing after the
+      <function>Probe()</function> phase.
+		</para>
+
+	      </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    Bool xf86SetEntityFuncs(int entityIndex, EntityProc init,
+                            EntityProc enter, EntityProc leave, pointer);
+	      </programlisting>
+	      <blockquote><para>
+      This function registers with an entity the <parameter>init</parameter>,
+      <parameter>enter</parameter>, <parameter>leave</parameter> functions along
+      with the pointer to their private area.
+		</para>
+
+	    </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    void xf86AddEntityToScreen(ScrnInfoPtr pScrn, int entityIndex);
+	      </programlisting>
+	      <blockquote><para>
+      This function associates the entity referenced by
+      <parameter>entityIndex</parameter> with the screen.
+		</para>
+
+	      </blockquote></para></blockquote>
+	</para>
+      </sect3>
+
+      <sect3>
+	<title>PreInit Phase</title>
+
+	<para>
+During this phase the remaining resources should be registered.
+<function>PreInit()</function> should call <function>xf86GetEntityInfo()</function>
+to obtain a pointer to an <structname>EntityInfoRec</structname> for each entity
+it is able to drive and check if any resource are listed in its
+<structfield>resources</structfield> field.  If resources registered in the Probe
+phase have been rejected in the post-Probe phase
+(<structfield>resources</structfield> is non-<constant>NULL</constant>), then the driver should
+decide if it can continue without using these or if it should fail.
+	</para>
+
+	<blockquote><para>
+	    <programlisting>
+    EntityInfoPtr xf86GetEntityInfo(int entityIndex);
+	    </programlisting>
+	    <blockquote><para>
+      This function returns a pointer to the <structname>EntityInfoRec</structname>
+      referenced by <parameter>entityIndex</parameter>.  The returned
+      <structname>EntityInfoRec</structname> should be freed with
+      <function>xfree()</function> when no longer needed.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<para>
+Several functions are provided to simplify resource registration:
+	  <blockquote><para>
+	      <programlisting>
+    Bool xf86IsEntityPrimary(int entityIndex);
+	      </programlisting>
+	      <blockquote><para>
+      This function returns <constant>TRUE</constant> if the entity referenced
+      by <parameter>entityIndex</parameter> is the primary display device (i.e.,
+      the one initialised at boot time and used in text mode).
+		</para>
+
+	      </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    Bool xf86IsScreenPrimary(int scrnIndex);
+	      </programlisting>
+	      <blockquote><para>
+      This function returns <constant>TRUE</constant> if the primary entity
+      is registered with the screen referenced by
+      <parameter>scrnIndex</parameter>.
+		</para>
+
+	      </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    pciVideoPtr xf86GetPciInfoForEntity(int entityIndex);
+	      </programlisting>
+	      <blockquote><para>
+      This function returns a pointer to the <structname>pciVideoRec</structname>
+      for the specified entity.  If the entity is not a PCI device,
+      <constant>NULL</constant> is returned.
+		</para>
+
+	      </blockquote></para></blockquote>
+	</para>
+
+	<para>
+The primary function for registration of resources is:
+	  <blockquote><para>
+	      <programlisting>
+    resPtr xf86RegisterResources(int entityIndex, resList list,
+                                 int access);
+	      </programlisting>
+	      <blockquote><para>
+      This function tries to register the resources in
+      <parameter>list</parameter>.  If list is <constant>NULL</constant> it tries
+      to determine the resources automatically.  This only works for
+      entities that provide a generic way to read out the resource ranges
+      they decode.  So far this is only the case for PCI devices.  By
+      default the PCI resources are registered as shared
+      (<constant>ResShared</constant>) if the driver wants to set a different
+      access type it can do so by specifying the access flags in the
+      third argument.  A value of <constant>0</constant> means to use the
+      default settings.  If for any reason the resource broker is not
+      able to register some of the requested resources the function will
+      return a pointer to a list of the failed ones.  In this case the
+      driver may be able to move the resource to different locations.
+      In case of PCI bus entities this is done by passing the list of
+      failed resources to <function>xf86ReallocatePciResources()</function>.
+      When the registration succeeds, the return value is
+      <constant>NULL</constant>.
+		</para>
+
+	      </blockquote></para></blockquote>
+	  </para>
+
+	<blockquote><para>
+	    <programlisting>
+    resPtr xf86ReallocatePciResources(int entityIndex, resPtr pRes);
+	    </programlisting>
+	    <blockquote><para>
+      This function takes a list of PCI resources that need to be
+      reallocated and returns <constant>NULL</constant> when all relocations are
+      successful.
+      <function>xf86RegisterResources()</function> should be called again to
+      register the relocated resources with the broker.
+      If the reallocation fails, a list of the resources that could not be
+      relocated is returned.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+<para>
+Two functions are provided to obtain a resource range of a given type:
+	  <blockquote><para>
+	      <programlisting>
+    resRange xf86GetBlock(long type, memType size,
+                          memType window_start, memType window_end,
+                          memType align_mask, resPtr avoid);
+	      </programlisting>
+	      <blockquote><para>
+      This function tries to find a block range of size
+      <parameter>size</parameter> and type <parameter>type</parameter> in a window
+      bound by <parameter>window_start</parameter> and <parameter>window_end</parameter>
+      with the alignment specified in <parameter>align_mask</parameter>.
+      Optionally a list of resource ranges which should be avoided within
+      the window can be supplied.  On failure a zero-length range of
+      type <constant>ResEnd</constant> will be returned.
+		</para>
+	      </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    resRange xf86GetSparse(long type, memType fixed_bits,
+                           memType decode_mask, memType address_mask,
+                           resPtr avoid);
+	      </programlisting>
+	      <blockquote><para>
+      This function is like the previous one, but attempts to find a
+      sparse range instead of a block range.  Here three values have to
+      be specified: the <parameter>address_mask</parameter> which marks all
+      bits of the mask part of the address, the <parameter>decode_mask</parameter>
+      which masks out the bits which are hardcoded and are therefore
+      not available for relocation and the values of the fixed bits.
+      The function tries to find a base that satisfies the given condition.
+      If the function fails it will return a zero range of type
+      <constant>ResEnd</constant>.  Optionally it might be passed a list of
+      resource ranges to avoid.
+		</para>
+
+	      </blockquote></para></blockquote>
+	</para>
+
+	<para>
+Some PCI devices are broken in the sense that they return invalid size
+information for a certain resource.  In this case the driver can supply
+the correct size and make sure that the resource range allocated for
+the card is large enough to hold the address range decoded by the card.
+The function <function>xf86FixPciResource()</function> can be used to do this:
+	  <blockquote><para>
+	      <programlisting>
+    Bool xf86FixPciResource(int entityIndex, unsigned int prt,
+                            CARD32 alignment, long type);
+	      </programlisting>
+	      <blockquote><para>
+      This function fixes a PCI resource allocation.  The
+      <parameter>prt</parameter> parameter contains the number of the PCI base
+      register that needs to be fixed (<constant>0-5</constant>, and
+      <constant>6</constant> for the BIOS base register).  The size is
+      specified by the alignment.  Since PCI resources need to span an
+      integral range of size <literal remap="tt">2&circ;n</literal>, the alignm      ent also
+      specifies the number of addresses that will be decoded.  If the
+      driver specifies a type mask it can override the default type for
+      PCI resources which is <constant>ResShared</constant>.  The resource
+      broker needs to know that to find a matching resource range.  This
+      function should be called before calling
+      <function>xf86RegisterResources()</function>.  The return value is
+      <constant>TRUE</constant> when the function succeeds.
+		</para>
+
+	      </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    Bool xf86CheckPciMemBase(pciVideoPtr pPci, memType base);
+	      </programlisting>
+	      <blockquote><para>
+      This function checks that the memory base address specified matches
+      one of the PCI base address register values for the given PCI
+      device.  This is mostly used to check that an externally provided
+      base address (e.g., from a config file) matches an actual value
+      allocated to a device.
+		</para>
+
+	      </blockquote></para></blockquote>
+	</para>
+
+	<para>
+The driver may replace the generic access control functions for an entity.
+This is done with the <function>xf86SetAccessFuncs()</function>:
+	  <blockquote><para>
+	      <programlisting>
+    void xf86SetAccessFuncs(EntityInfoPtr pEnt,
+                            xf86SetAccessFuncPtr funcs,
+                            xf86SetAccessFuncPtr oldFuncs);
+	      </programlisting>
+     with:
+	      <programlisting>
+      typedef struct {
+          xf86AccessPtr mem;
+          xf86AccessPtr io;
+          xf86AccessPtr io_mem;
+      } xf86SetAccessFuncRec, *xf86SetAccessFuncPtr;
+	      </programlisting>
+	      <blockquote><para>
+      The driver can pass three functions: one for I/O access, one for
+      memory access and one for combined memory and I/O access.  If the
+      memory access and combined access functions are identical the
+      common level assumes that the memory access cannot be controlled
+      independently of I/O access, if the I/O access function and the
+      combined access functions are the same it is assumed that I/O can
+      not be controlled independently.  If memory and I/O have to be
+      controlled together all three values should be the same.  If a
+      non <constant>NULL</constant> value is passed as third argument it is
+      interpreted as an address where to store the old access record.
+      If the third argument is <constant>NULL</constant> it will be assumed
+      that the generic access should be enabled before replacing the
+      access functions.  Otherwise it will be disabled.  The driver may
+      enable them itself using the returned values.  It should do this
+      from its replacement access functions as the generic access may
+      be disabled by the common level on certain occasions.  If replacement
+      functions are specified they must control all resources of the
+      specific type registered for the entity.
+		</para>
+
+	      </blockquote></para></blockquote>
+	</para>
+
+	<para>
+To find out if a specific resource range conflicts with another
+resource the <function>xf86ChkConflict()</function> function may be used:
+	  <blockquote><para>
+	      <programlisting>
+    memType xf86ChkConflict(resRange *rgp, int entityIndex);
+	      </programlisting>
+	      <blockquote><para>
+      This function checks if the resource range <parameter>rgp</parameter> of
+      for the specified entity conflicts with with another resource.
+      If a conflict is found, the address of the start of the conflict
+      is returned.  The return value is zero when there is no conflict.
+		</para>
+
+	      </blockquote></para></blockquote>
+	</para>
+
+	<para>
+The OPERATING state properties of previously registered fixed resources
+can be set with the <function>xf86SetOperatingState()</function> function:
+	  <blockquote><para>
+	      <programlisting>
+    resPtr xf86SetOperatingState(resList list, int entityIndex,
+                                 int mask);
+	      </programlisting>
+	      <blockquote><para>
+      This function is used to set the status of a resource during
+      OPERATING state.  <parameter>list</parameter> holds a list to which
+      <parameter>mask</parameter> is to be applied.  The parameter
+      <parameter>mask</parameter> may have the value <constant>ResUnusedOpr</constant>
+      and <constant>ResDisableOpr</constant>.  The first one should be used
+      if a resource isn't used by the driver during OPERATING state
+      although it is decoded by the device, while the latter one indicates
+      that the resource is not decoded during OPERATING state.  Note
+      that the resource ranges have to match those specified during
+      registration.  If a range has been specified starting at
+      <literal remap="tt">A</literal> and ending at <literal remap="tt">B</literal> and suppose
+      <literal remap="tt">C</literal> us a value satisfying
+      <literal remap="tt">A&nbsp;&lt;&nbsp;C&nbsp;&lt;&nbsp;B</literal> one may not
+      specify the resource range <literal remap="tt">(A,B)</literal> by splitting it
+      into two ranges <literal remap="tt">(A,C)</literal> and <literal remap="tt">(C,B)</literal>.
+		</para>
+
+	      </blockquote></para></blockquote>
+	</para>
+
+	<para>
+The following two functions are provided for special cases:
+	  <blockquote><para>
+	      <programlisting>
+    void xf86RemoveEntityFromScreen(ScrnInfoPtr pScrn, int entityIndex);
+	      </programlisting>
+	      <blockquote><para>
+      This function may be used to remove an entity from a screen.  This
+      only makes sense if a screen has more than one entity assigned or
+      the screen is to be deleted.  No test is made if the screen has
+      any entities left.
+		</para>
+
+	      </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    void xf86DeallocateResourcesForEntity(int entityIndex, long type);
+	      </programlisting>
+	      <blockquote><para>
+      This function deallocates all resources of a given type registered
+      for a certain entity from the resource broker list.
+		</para>
+
+	      </blockquote></para></blockquote>
+	</para>
+
+      </sect3>
+
+      <sect3>
+	<title>ScreenInit Phase</title>
+
+	<para>
+All that is required in this phase is to setup the RAC flags.  Note that
+it is also permissible to set these flags up in the PreInit phase.  The
+RAC flags are held in the <structfield>racIoFlags</structfield> and <structfield>racMemFlags</structfield> fields of the
+<structname>ScrnInfoRec</structname> for each screen.  They specify which graphics operations
+might require the use of shared resources.  This can be specified
+separately for memory and I/O resources.  The available flags are defined
+in <filename>rac/xf86RAC.h</filename>.  They are:
+
+	  <variablelist>
+	    <varlistentry><term><constant>RAC_FB</constant></term>
+	      <listitem><para>
+	for framebuffer operations (including hw acceleration)
+		</para></listitem></varlistentry>
+	    <varlistentry><term><constant>RAC_CURSOR</constant></term>
+	      <listitem><para>
+	for Cursor operations
+        (??? I'm not sure if we need this for SW cursor it depends
+         on which level the sw cursor is drawn)
+		</para></listitem></varlistentry>
+	    <varlistentry><term><constant>RAC_COLORMAP</constant></term>
+	      <listitem><para>
+	for colormap operations
+		</para></listitem></varlistentry>
+	    <varlistentry><term><constant>RAC_VIEWPORT</constant></term>
+	      <listitem><para>
+	for the call to <function>ChipAdjustFrame()</function>
+		</para></listitem></varlistentry>
+	    </variablelist>
+
+
+The flags are ORed together.
+	</para>
+      </sect3>
+    </sect2>
+  </sect1>
+
+  <sect1 id="options">
+    <title>Config file <quote>Option</quote> entries</title>
+
+    <para>
+Option entries are permitted in most sections and subsections of the
+config file.  There are two forms of option entries:
+
+      <variablelist>
+	<varlistentry><term>Option "option-name"</term>
+	  <listitem><para>
+	A boolean option.
+	    </para></listitem></varlistentry>
+	<varlistentry><term>Option "option-name" "option-value"</term>
+	  <listitem><para>
+	An option with an arbitrary value.
+	    </para></listitem></varlistentry>
+      </variablelist>
+    </para>
+
+    <para>
+The option entries are handled by the parser, and a list of the parsed
+options is included with each of the appropriate data structures that
+the drivers have access to.  The data structures used to hold the option
+information are opaque to the driver, and a driver must not access the
+option data directly.  Instead, the common layer provides a set of
+functions that may be used to access, check and manipulate the option
+data.
+    </para>
+
+    <para>
+First, the low level option handling functions.  In most cases drivers
+would not need to use these directly.
+    </para>
+
+    <blockquote><para>
+	<programlisting>
+    pointer xf86FindOption(pointer options, const char *name);
+	</programlisting>
+	<blockquote><para>
+      Takes a list of options and an option name, and returns a handle
+      for the first option entry in the list matching the name.  Returns
+      <constant>NULL</constant> if no match is found.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    char *xf86FindOptionValue(pointer options, const char *name);
+	</programlisting>
+	<blockquote><para>
+      Takes a list of options and an option name, and returns the value
+      associated with the first option entry in the list matching the
+      name.  If the matching option has no value, an empty string
+      (<constant>""</constant>) is returned.  Returns <constant>NULL</constant>
+      if no match is found.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    void xf86MarkOptionUsed(pointer option);
+	</programlisting>
+	<blockquote><para>
+      Takes a handle for an option, and marks that option as used.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    void xf86MarkOptionUsedByName(pointer options, const char *name);
+	</programlisting>
+	<blockquote><para>
+      Takes a list of options and an option name and marks the first
+      option entry in the list matching the name as used.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <para>
+Next, the higher level functions that most drivers would use.
+    </para>
+    <blockquote><para>
+	<programlisting>
+    void xf86CollectOptions(ScrnInfoPtr pScrn, pointer extraOpts);
+	</programlisting>
+	<blockquote><para>
+      Collect the options from each of the config file sections used by
+      the screen (<parameter>pScrn</parameter>) and return the merged list as
+      <structfield>pScrn-&gt;options</structfield>.  This function requires that
+      <structfield>pScrn-&gt;confScreen</structfield>, <structfield>pScrn-&gt;display</structfield>,
+      <structfield>pScrn-&gt;monitor</structfield>,
+      <structfield>pScrn-&gt;numEntities</structfield>, and
+      <structfield>pScrn-&gt;entityList</structfield> are initialised.
+      <parameter>extraOpts</parameter> may optionally be set to an additional
+      list of options to be combined with the others.  The order of
+      precedence for options is <parameter>extraOpts</parameter>, display,
+      confScreen, monitor, device.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    void xf86ProcessOptions(int scrnIndex, pointer options,
+                            OptionInfoPtr optinfo);
+	</programlisting>
+	<blockquote><para>
+      Processes a list of options according to the information in the
+      array of <structname>OptionInfoRecs</structname> (<parameter>optinfo</parameter>).
+      The resulting information is stored in the <structfield>value</structfield>
+      fields of the appropriate <parameter>optinfo</parameter> entries.  The
+      <structfield>found</structfield> fields are set to <constant>TRUE</constant>
+      when an option with a value of the correct type if found, and
+      <constant>FALSE</constant> otherwise.  The <structfield>type</structfield> field
+      is used to determine the expected value type for each option.
+      Each option in the list of options for which there is a name match
+      (but not necessarily a value type match) is marked as used.
+      Warning messages are printed when option values don't match the
+      types specified in the optinfo data.
+	  </para>
+
+	  <para>
+      NOTE: If this function is called before a driver's screen number
+      is known (e.g., from the <function>ChipProbe()</function> function) a
+      <parameter>scrnIndex</parameter> value of <constant>-1</constant> should be
+      used.
+	  </para>
+
+	  <para>
+      NOTE 2: Given that this function stores into the
+      <literal remap="tt">OptionInfoRecs</literal> pointed to by <parameter>optinfo</parameter>,
+      the caller should ensure the <literal remap="tt">OptionInfoRecs</literal> are
+      (re-)initialised before the call, especially if the caller expects
+      to use the predefined option values as defaults.
+	  </para>
+
+	  <para>
+      The <structname>OptionInfoRec</structname> is defined as follows:
+
+	    <programlisting>
+      typedef struct {
+          double freq;
+          int units;
+      } OptFrequency;
+
+      typedef union {
+          unsigned long       num;
+          char *              str;
+          double              realnum;
+          Bool                bool;
+          OptFrequency        freq;
+      } ValueUnion;
+
+      typedef enum {
+          OPTV_NONE = 0,
+          OPTV_INTEGER,
+          OPTV_STRING,  /* a non-empty string */
+          OPTV_ANYSTR,  /* Any string, including an empty one */
+          OPTV_REAL,
+          OPTV_BOOLEAN,
+          OPTV_PERCENT,
+          OPTV_FREQ
+      } OptionValueType;
+
+      typedef enum {
+          OPTUNITS_HZ = 1,
+          OPTUNITS_KHZ,
+          OPTUNITS_MHZ
+      } OptFreqUnits;
+
+      typedef struct {
+          int                 token;
+          const char*         name;
+          OptionValueType     type;
+          ValueUnion          value;
+          Bool                found;
+      } OptionInfoRec, *OptionInfoPtr;
+	    </programlisting>
+	  </para>
+	  <para>
+      <constant>OPTV_FREQ</constant> can be used for options values that are
+      frequencies.  These values are a floating point number with an
+      optional unit name appended.  The unit name can be one of "Hz",
+      "kHz", "k", "MHz", "M".  The multiplier associated with the unit
+      is stored in <structfield>freq.units</structfield>, and the scaled frequency
+      is stored in <structfield>freq.freq</structfield>.  When no unit is specified,
+      <structfield>freq.units</structfield> is set to <constant>0</constant>, and
+      <structfield>freq.freq</structfield> is unscaled.
+	  </para>
+
+	  <para>
+      <constant>OPTV_PERCENT</constant> can be used for option values that are
+      specified in percent (e.g. "20%"). These values are a floating point
+      number with a percent sign appended. If the percent sign is missing,
+      the parser will fail to match the value.
+	  </para>
+
+	  <para>
+      Typical usage is to setup an array of
+      <structname>OptionInfoRec</structname>s with all fields initialised.
+      The <structfield>value</structfield> and <structfield>found</structfield> fields get
+      set by <function>xf86ProcessOptions()</function>.  For cases where the
+      value parsing is more complex, the driver should specify
+      <constant>OPTV_STRING</constant>, and parse the string itself.  An
+      example of using this option handling is included in the
+      <link linkend="sample">Sample Driver</link> section.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    void xf86ShowUnusedOptions(int scrnIndex, pointer options);
+	</programlisting>
+	<blockquote><para>
+      Prints out warning messages for each option in the list of options
+      that isn't marked as used.  This is intended to show options that
+      the driver hasn't recognised.  It would normally be called near
+      the end of the <function>ChipScreenInit()</function> function, but only
+      when <code>serverGeneration&nbsp;==&nbsp;1</code>
+	  </para>
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    OptionInfoPtr xf86TokenToOptinfo(const OptionInfoRec *table,
+                                     int token);
+	</programlisting>
+	<blockquote><para>
+      Returns a pointer to the <structname>OptionInfoRec</structname> in
+      <parameter>table</parameter> with a token field matching
+      <parameter>token</parameter>.  Returns <constant>NULL</constant> if no match
+      is found.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    Bool xf86IsOptionSet(const OptionInfoRec *table, int token);
+	</programlisting>
+	<blockquote><para>
+      Returns the <literal remap="tt">found</literal> field of the
+      <structname>OptionInfoRec</structname> in <parameter>table</parameter> with a
+      <structfield>token</structfield> field matching <parameter>token</parameter>.  This
+      can be used for options of all types.  Note that for options of
+      type <constant>OPTV_BOOLEAN</constant>, it isn't sufficient to check
+      this to determine the value of the option.  Returns
+      <constant>FALSE</constant> if no match is found.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    char *xf86GetOptValString(const OptionInfoRec *table, int token);
+	</programlisting>
+	<blockquote><para>
+      Returns the <structfield>value.str</structfield> field of the
+      <structname>OptionInfoRec</structname> in <parameter>table</parameter> with a
+      token field matching <parameter>token</parameter>.  Returns
+      <constant>NULL</constant> if no match is found.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    Bool xf86GetOptValInteger(const OptionInfoRec *table, int token,
+
+                                int *value);
+	      </programlisting>
+	      <blockquote><para>
+      Returns via <parameter>*value</parameter> the <structfield>value.num</structfield>
+      field of the <structname>OptionInfoRec</structname> in <parameter>table</parameter>
+      with a <structfield>token</structfield> field matching <parameter>token</parameter>.
+      <parameter>*value</parameter> is only changed when a match is found so
+      it can be safely initialised with a default prior to calling this
+      function.  The function return value is as for
+      <function>xf86IsOptionSet()</function>.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    Bool xf86GetOptValULong(const OptionInfoRec *table, int token,
+                            unsigned long *value);
+	</programlisting>
+	<blockquote><para>
+      Like <function>xf86GetOptValInteger()</function>, except the value is
+      treated as an <type>unsigned long</type>.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    Bool xf86GetOptValReal(const OptionInfoRec *table, int token,
+                           double *value);
+	</programlisting>
+	<blockquote><para>
+      Like <function>xf86GetOptValInteger()</function>, except that
+      <structfield>value.realnum</structfield> is used.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    Bool xf86GetOptValFreq(const OptionInfoRec *table, int token,
+                           OptFreqUnits expectedUnits, double *value);
+	</programlisting>
+	<blockquote><para>
+      Like <function>xf86GetOptValInteger()</function>, except that the
+      <structfield>value.freq</structfield> data is returned.  The frequency value
+      is scaled to the units indicated by <parameter>expectedUnits</parameter>.
+      The scaling is exact when the units were specified explicitly in
+      the option's value.  Otherwise, the <parameter>expectedUnits</parameter>
+      field is used as a hint when doing the scaling.  In this case,
+      values larger than <constant>1000</constant> are assumed to have be
+      specified in the next smallest units.  For example, if the Option
+      value is "10000" and expectedUnits is <constant>OPTUNITS_MHZ</constant>,
+      the value returned is <constant>10</constant>.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+      <programlisting>
+    Bool xf86GetOptValBool(const OptionInfoRec *table, int token, Bool *value);
+      </programlisting>
+	<blockquote><para>
+      This function is used to check boolean options
+      (<constant>OPTV_BOOLEAN</constant>).  If the function return value is
+      <constant>FALSE</constant>, it means the option wasn't set.  Otherwise
+      <parameter>*value</parameter> is set to the boolean value indicated by
+      the option's value.  No option <parameter>value</parameter> is interpreted
+      as <constant>TRUE</constant>.  Option values meaning <constant>TRUE</constant>
+      are "1", "yes", "on", "true", and option values meaning
+      <constant>FALSE</constant> are "0", "no", "off", "false".  Option names
+      both with the "no" prefix in their names, and with that prefix
+      removed are also checked and handled in the obvious way.
+      <parameter>*value</parameter> is not changed when the option isn't present.
+      It should normally be set to a default value before calling this
+      function.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    Bool xf86ReturnOptValBool(const OptionInfoRec *table, int token, Bool def);
+	</programlisting>
+	<blockquote><para>
+      This function is used to check boolean options
+      (<constant>OPTV_BOOLEAN</constant>).  If the option is set, its value
+      is returned.  If the options is not set, the default value specified
+      by <parameter>def</parameter> is returned.  The option interpretation is
+      the same as for <function>xf86GetOptValBool()</function>.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+    <blockquote><para>
+	<programlisting>
+    int xf86NameCmp(const char *s1, const char *s2);
+	</programlisting>
+	<blockquote><para>
+      This function should be used when comparing strings from the config
+      file with expected values.  It works like <function>strcmp()</function>,
+      but is not case sensitive and space, tab, and <quote><literal>_</literal></quote> characters
+      are ignored in the comparison.  The use of this function isn't
+      restricted to parsing option values.  It may be used anywhere
+      where this functionality required.
+	  </para>
+
+	</blockquote></para></blockquote>
+  </sect1>
+
+  <sect1>
+    <title>Modules, Drivers, Include Files and Interface Issues</title>
+
+    <para>
+NOTE: this section is incomplete.
+    </para>
+
+
+    <sect2>
+      <title>Include files</title>
+
+      <para>
+The following include files are typically required by video drivers:
+
+	<blockquote><para>
+  All drivers should include these:
+	    <literallayout><filename>
+    "xf86.h"
+    "xf86_OSproc.h"
+    "xf86_ansic.h"
+    "xf86Resources.h"
+	    </filename></literallayout>
+  Wherever inb/outb (and related things) are used the following should be
+  included:
+	    <literallayout><filename>
+    "compiler.h"
+	      </filename></literallayout>
+  Note: in drivers, this must be included after <filename>"xf86_ansic.h"</filename>.
+	  </para>
+
+	  <para>
+  Drivers that need to access PCI vendor/device definitions need this:
+	    <literallayout><filename>
+    "xf86PciInfo.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  Drivers that need to access the PCI config space need this:
+	    <literallayout><filename>
+    "xf86Pci.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  Drivers that initialise a SW cursor need this:
+	    <literallayout><filename>
+    "mipointer.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  All drivers implementing backing store need this:
+	    <literallayout><filename>
+    "mibstore.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  All drivers using the mi colourmap code need this:
+	    <literallayout><filename>
+    "micmap.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  If a driver uses the vgahw module, it needs this:
+	    <literallayout><filename>
+    "vgaHW.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  Drivers supporting VGA or Hercules monochrome screens need:
+	    <literallayout><filename>
+    "xf1bpp.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  Drivers supporting VGA or EGC 16-colour screens need:
+	    <literallayout><filename>
+    "xf4bpp.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  Drivers using cfb need:
+	    <programlisting>
+    #define PSZ 8
+    #include "cfb.h"
+    #undef PSZ
+	    </programlisting>
+	  </para>
+
+	  <para>
+  Drivers supporting bpp 16, 24 or 32 with cfb need one or more of:
+	    <literallayout><filename>
+    "cfb16.h"
+    "cfb24.h"
+    "cfb32.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  If a driver uses XAA, it needs these:
+	    <literallayout><filename>
+    "xaa.h"
+    "xaalocal.h"
+	      </filename></literallayout>
+	  </para>
+
+	  <para>
+  If a driver uses the fb manager, it needs this:
+	    <literallayout><filename>
+    "xf86fbman.h"
+	      </filename></literallayout>
+	  </para>
+	</blockquote>
+      </para>
+
+      <para>
+Non-driver modules should include <filename>"xf86_ansic.h"</filename> to get the correct
+wrapping of ANSI C/libc functions.
+      </para>
+
+      <para>
+All modules must NOT include any system include files, or the following:
+
+	<literallayout><filename>
+    "xf86Priv.h"
+    "xf86Privstr.h"
+    "xf86_OSlib.h"
+    "Xos.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+In addition, "xf86_libc.h" must not be included explicitly.  It is
+included implicitly by "xf86_ansic.h".
+      </para>
+
+    </sect2>
+  </sect1>
+
+  <sect1>
+    <title>Offscreen Memory Manager</title>
+
+    <para>
+Management of offscreen video memory may be handled by the XFree86
+framebuffer manager.  Once the offscreen memory manager is running,
+drivers or extensions may allocate, free or resize areas of offscreen
+video memory using the following functions (definitions taken from
+<filename>xf86fbman.h</filename>):
+
+      <programlisting>
+    typedef struct _FBArea {
+        ScreenPtr    pScreen;
+        BoxRec       box;
+        int          granularity;
+        void         (*MoveAreaCallback)(struct _FBArea*, struct _FBArea*)
+        void         (*RemoveAreaCallback)(struct _FBArea*)
+        DevUnion     devPrivate;
+    } FBArea, *FBAreaPtr;
+
+    typedef void (*MoveAreaCallbackProcPtr)(FBAreaPtr from, FBAreaPtr to)
+    typedef void (*RemoveAreaCallbackProcPtr)(FBAreaPtr)
+
+    FBAreaPtr xf86AllocateOffscreenArea (
+        ScreenPtr pScreen,
+        int width, int height,
+        int granularity,
+        MoveAreaCallbackProcPtr MoveAreaCallback,
+        RemoveAreaCallbackProcPtr RemoveAreaCallback,
+        pointer privData
+    )
+
+    void xf86FreeOffscreenArea (FBAreaPtr area)
+
+    Bool xf86ResizeOffscreenArea (
+	FBAreaPtr area
+	int w, int h
+    )
+      </programlisting>
+    </para>
+
+    <para>
+The function:
+      <programlisting>
+    Bool xf86FBManagerRunning(ScreenPtr pScreen);
+      </programlisting>
+
+can be used by an extension to check if the driver has initialized
+the memory manager.  The manager is not available if this returns
+<constant>FALSE</constant> and the functions above will all fail.
+    </para>
+
+
+    <para>
+<function>xf86AllocateOffscreenArea()</function> can be used to request a
+rectangle of dimensions <parameter>width</parameter>&nbsp;&times;&nbsp;<parameter>height</parameter>
+(in pixels) from unused offscreen memory.  <parameter>granularity</parameter>
+specifies that the leftmost edge of the rectangle must lie on some
+multiple of <parameter>granularity</parameter> pixels.  A granularity of zero
+means the same thing as a granularity of one - no alignment preference.
+A <parameter>MoveAreaCallback</parameter> can be provided to notify the requester
+when the offscreen area is moved.  If no <parameter>MoveAreaCallback</parameter>
+is supplied then the area is considered to be immovable.  The
+<parameter>privData</parameter> field will be stored in the manager's internal
+structure for that allocated area and will be returned to the requester
+in the <parameter>FBArea</parameter> passed via the
+<parameter>MoveAreaCallback</parameter>.  An optional
+<parameter>RemoveAreaCallback</parameter> is provided.  If the driver provides
+this it indicates that the area should be allocated with a lower priority.
+Such an area may be removed when a higher priority request (one that
+doesn't have a <parameter>RemoveAreaCallback</parameter>) is made.  When this
+function is called, the driver will have an opportunity to do whatever
+cleanup it needs to do to deal with the loss of the area, but it must
+finish its cleanup before the function exits since the offscreen memory
+manager will free the area immediately after.
+    </para>
+
+    <para>
+<function>xf86AllocateOffscreenArea()</function> returns <constant>NULL</constant>
+if it was unable to allocate the requested area.  When no longer needed,
+areas should be freed with <function>xf86FreeOffscreenArea()</function>.
+    </para>
+
+    <para>
+<function>xf86ResizeOffscreenArea()</function> resizes an existing
+<literal remap="tt">FBArea</literal>.  <function>xf86ResizeOffscreenArea()</function>
+returns <constant>TRUE</constant> if the resize was successful.  If
+<function>xf86ResizeOffscreenArea()</function> returns <constant>FALSE</constant>,
+the original <literal remap="tt">FBArea</literal> is left unmodified.  Resizing an
+area maintains the area's original <literal remap="tt">granularity</literal>,
+<literal remap="tt">devPrivate</literal>, and <literal remap="tt">MoveAreaCallback</literal>.
+<function>xf86ResizeOffscreenArea()</function> has considerably less overhead
+than freeing the old area then reallocating the new size, so it should
+be used whenever possible.
+    </para>
+
+    <para>
+The function:
+      <programlisting>
+    Bool xf86QueryLargestOffscreenArea(
+      ScreenPtr pScreen,
+      int *width, int *height,
+      int granularity,
+      int preferences,
+      int priority
+    );
+	</programlisting>
+
+is provided to query the width and height of the largest single
+<structname>FBArea</structname> allocatable given a particular priority.
+<parameter>preferences</parameter> can be one of the following to indicate
+whether width, height or area should be considered when determining
+which is the largest single <structname>FBArea</structname> available.
+
+      <programlisting>
+  FAVOR_AREA_THEN_WIDTH
+  FAVOR_AREA_THEN_HEIGHT
+  FAVOR_WIDTH_THEN_AREA
+  FAVOR_HEIGHT_THEN_AREA
+      </programlisting>
+    </para>
+
+    <para>
+<parameter>priority</parameter> is one of the following:
+
+      <blockquote>
+	<para>
+  <constant>PRIORITY_LOW</constant>
+	  <blockquote><para>
+     Return the largest block available without stealing anyone else's
+     space.  This corresponds to the priority of allocating a
+     <structname>FBArea</structname> when a <function>RemoveAreaCallback</function>
+     is provided.
+	    </para></blockquote>
+	</para>
+
+	<para>
+   <constant>PRIORITY_NORMAL</constant>
+	  <blockquote><para>
+     Return the largest block available if it is acceptable to steal a
+     lower priority area from someone.  This corresponds to the priority
+     of allocating a <structname>FBArea</structname> without providing a
+     <function>RemoveAreaCallback</function>.
+	    </para></blockquote>
+	</para>
+
+	<para>
+    <constant>PRIORITY_EXTREME</constant>
+	  <blockquote><para>
+     Return the largest block available if all <structname>FBArea</structname>s
+     that aren't locked down were expunged from memory first.  This
+     corresponds to any allocation made directly after a call to
+     <function>xf86PurgeUnlockedOffscreenAreas()</function>.
+	    </para></blockquote>
+	</para>
+
+      </blockquote>
+    </para>
+
+
+    <para>
+The function:
+
+      <programlisting>
+    Bool xf86PurgeUnlockedOffscreenAreas(ScreenPtr pScreen);
+      </programlisting>
+
+is provided as an extreme method to free up offscreen memory.  This
+will remove all removable <structname>FBArea</structname> allocations.
+    </para>
+
+
+    <para>
+Initialization of the XFree86 framebuffer manager is done via
+
+      <programlisting>
+    Bool xf86InitFBManager(ScreenPtr pScreen, BoxPtr FullBox);
+      </programlisting>
+
+<parameter>FullBox</parameter> represents the area of the framebuffer that the
+manager is allowed to manage.  This is typically a box with a width of
+<structfield>pScrn-&gt;displayWidth</structfield> and a height of as many lines as
+can be fit within the total video memory, however, the driver can reserve
+areas at the extremities by passing a smaller area to the manager.
+    </para>
+
+    <para>
+<function>xf86InitFBManager()</function> must be called before XAA is
+initialized since XAA uses the manager for it's pixmap cache.
+    </para>
+
+    <para>
+An alternative function is provided to allow the driver to initialize
+the framebuffer manager with a Region rather than a box.
+
+    <programlisting>
+    Bool xf86InitFBManagerRegion(ScreenPtr pScreen,
+                                 RegionPtr FullRegion);
+    </programlisting>
+
+<function>xf86InitFBManagerRegion()</function>, unlike
+<function>xf86InitFBManager()</function>, does not remove the area used for
+the visible screen so that area should not be included in the region
+passed to the function.  <function>xf86InitFBManagerRegion()</function> is
+useful when non-contiguous areas are available to be managed, and is
+required when multiple framebuffers are stored in video memory (as in
+the case where an overlay of a different depth is stored as a second
+framebuffer in offscreen memory).
+    </para>
+
+  </sect1>
+
+  <sect1 id="cmap">
+    <title>Colormap Handling</title>
+
+    <para>
+A generic colormap handling layer is provided within the XFree86 common
+layer.  This layer takes care of most of the details, and only requires
+a function from the driver that loads the hardware palette when required.
+To use the colormap layer, a driver calls the
+<function>xf86HandleColormaps()</function> function.
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86HandleColormaps(ScreenPtr pScreen, int maxColors,
+                             int sigRGBbits, LoadPaletteFuncPtr loadPalette,
+                             SetOverscanFuncPtr setOverscan,
+                             unsigned int flags);
+	  </programlisting>
+	  <blockquote><para>
+      This function must be called after the default colormap has been
+      initialised.  The <structfield>pScrn-&gt;gamma</structfield> field must also
+      be initialised, preferably by calling <function>xf86SetGamma()</function>.
+      <parameter>maxColors</parameter> is the number of entries in the palette.
+      <parameter>sigRGBbits</parameter> is the size in bits of each color
+      component in the DAC's palette.  <parameter>loadPalette</parameter>
+      is a driver-provided function for loading a colormap into the
+      hardware, and is described below.  <parameter>setOverscan</parameter> is
+      an optional function that may be provided when the overscan color
+      is an index from the standard LUT and when it needs to be adjusted
+      to keep it as close to black as possible.  The
+      <parameter>setOverscan</parameter> function programs the overscan index.
+      It shouldn't normally be used for depths other than 8.
+      <parameter>setOverscan</parameter> should be set to <constant>NULL</constant>
+      when it isn't needed.  <parameter>flags</parameter> may be set to the
+      following (which may be ORed together):
+
+	      <variablelist>
+		<varlistentry>
+		  <term><constant>CMAP_PALETTED_TRUECOLOR</constant></term>
+		  <listitem><para>
+				    the TrueColor visual is paletted and is
+				    just a special case of DirectColor.
+				    This flag is only valid for
+				    <code>bpp&nbsp;&gt;&nbsp;8</code>.
+
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>CMAP_RELOAD_ON_MODE_SWITCH</constant></term>
+		  <listitem><para>
+				    reload the colormap automatically
+                                    after mode switches.  This is useful
+                                    for when the driver is resetting the
+                                    hardware during mode switches and
+                                    corrupting or erasing the hardware
+                                    palette.
+
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>CMAP_LOAD_EVEN_IF_OFFSCREEN</constant></term>
+		  <listitem><para>
+				    reload the colormap even if the screen
+				    is switched out of the server's VC.
+				    The palette is <emphasis>not</emphasis> reloaded when
+				    the screen is switched back in, nor after
+				    mode switches.  This is useful when the
+				    driver needs to keep track of palette
+				    changes.
+
+		    </para></listitem></varlistentry>
+	      </variablelist>
+	    </para>
+
+	    <para>
+      The colormap layer normally reloads the palette after VT enters so it
+      is not necessary for the driver to save and restore the palette
+      when switching VTs.  The driver must, however, still save the
+      initial palette during server start up and restore it during
+      server exit.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoadPalette(ScrnInfoPtr pScrn, int numColors, int *indices,
+                     LOCO *colors, VisualPtr pVisual);
+	  </programlisting>
+	  <blockquote><para>
+      <function>LoadPalette()</function> is a driver-provided function for
+      loading a colormap into hardware.  <parameter>colors</parameter> is the
+      array of RGB values that represent the full colormap.
+      <parameter>indices</parameter> is a list of index values into the colors
+      array.  These indices indicate the entries that need to be updated.
+      <parameter>numColors</parameter> is the number of the indices to be
+      updated.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void SetOverscan(ScrnInfoPtr pScrn, int overscan);
+	  </programlisting>
+	  <blockquote><para>
+      <function>SetOverscan()</function> is a driver-provided function for
+      programming the <parameter>overscan</parameter> index.  As described
+      above, it is normally only appropriate for LUT modes where all
+      colormap entries are available for the display, but where one of
+      them is also used for the overscan (typically 8bpp for VGA compatible
+      LUTs).  It isn't required in cases where the overscan area is
+      never visible.
+	    </para>
+
+	  </blockquote></para>
+      </blockquote></para>
+
+  </sect1>
+
+  <sect1>
+    <title>DPMS Extension</title>
+
+    <para>
+Support code for the DPMS extension is included in the XFree86 common layer.
+This code provides an interface between the main extension code, and a means
+for drivers to initialise DPMS when they support it.  One function is
+available to drivers to do this initialisation, and it is always available,
+even when the DPMS extension is not supported by the core server (in
+which case it returns a failure result).
+    </para>
+
+    <blockquote><para>
+	<programlisting>
+    Bool xf86DPMSInit(ScreenPtr pScreen, DPMSSetProcPtr set, int flags);
+	</programlisting>
+	<blockquote><para>
+      This function registers a driver's DPMS level programming function
+      <parameter>set</parameter>.  It also checks
+      <structfield>pScrn-&gt;options</structfield> for the "dpms" option, and when
+      present marks DPMS as being enabled for that screen.  The
+      <parameter>set</parameter> function is called whenever the DPMS level
+      changes, and is used to program the requested level.
+      <parameter>flags</parameter> is currently not used, and should be
+      <constant>0</constant>.  If the initialisation fails for any reason,
+      including when there is no DPMS support in the core server, the
+      function returns <constant>FALSE</constant>.
+	  </para>
+
+	</blockquote></para></blockquote>
+
+
+    <para>
+Drivers that implement DPMS support must provide the following function,
+that gets called when the DPMS level is changed:
+
+
+      <blockquote><para>
+	  <programlisting>
+    void ChipDPMSSet(ScrnInfoPtr pScrn, int level, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      Program the DPMS level specified by <parameter>level</parameter>.  Valid
+      values of <parameter>level</parameter> are <constant>DPMSModeOn</constant>,
+      <constant>DPMSModeStandby</constant>, <constant>DPMSModeSuspend</constant>,
+      <constant>DPMSModeOff</constant>.  These values are defined in
+      <filename>"extensions/dpms.h"</filename>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </para>
+
+  </sect1>
+
+  <sect1>
+    <title>DGA Extension</title>
+
+    <para>
+Drivers can support the XFree86 Direct Graphics Architecture (DGA) by
+filling out a structure of function pointers and a list of modes and
+passing them to DGAInit.
+    </para>
+
+    <blockquote><para>
+	<programlisting>
+    Bool DGAInit(ScreenPtr pScreen, DGAFunctionPtr funcs,
+                 DGAModePtr modes, int num);
+
+/** The DGAModeRec **/
+
+typedef struct {
+  int num;
+  DisplayModePtr mode;
+  int flags;
+  int imageWidth;
+  int imageHeight;
+  int pixmapWidth;
+  int pixmapHeight;
+  int bytesPerScanline;
+  int byteOrder;
+  int depth;
+  int bitsPerPixel;
+  unsigned long red_mask;
+  unsigned long green_mask;
+  unsigned long blue_mask;
+  int viewportWidth;
+  int viewportHeight;
+  int xViewportStep;
+  int yViewportStep;
+  int maxViewportX;
+  int maxViewportY;
+  int viewportFlags;
+  int offset;
+  unsigned char *address;
+  int reserved1;
+  int reserved2;
+} DGAModeRec, *DGAModePtr;
+	</programlisting>
+
+	<variablelist>
+	  <varlistentry>
+	    <term><structfield>num</structfield></term>
+	    <listitem><para>
+	 Can be ignored.  The DGA DDX will assign these numbers.
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>mode</structfield></term>
+	    <listitem><para>
+	A pointer to the <structname>DisplayModeRec</structname> for this mode.
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>flags</structfield></term>
+	      <listitem><para>
+	The following flags are defined and may be OR'd together:
+
+		  <variablelist>
+		    <varlistentry>
+		      <term><constant>DGA_CONCURRENT_ACCESS</constant></term>
+		      <listitem><para>
+            Indicates that the driver supports concurrent graphics
+            accelerator and linear framebuffer access.
+
+			</para></listitem></varlistentry>
+
+		    <varlistentry>
+		      <term><constant>DGA_FILL_RECT
+			  DGA_BLIT_RECT
+			  DGA_BLIT_RECT_TRANS</constant></term>
+		      <listitem><para>
+	    Indicates that the driver supports the FillRect, BlitRect
+            or BlitTransRect functions in this mode.
+
+			</para></listitem></varlistentry>
+
+		    <varlistentry>
+		      <term><constant>DGA_PIXMAP_AVAILABLE</constant></term>
+		      <listitem><para>
+	    Indicates that Xlib may be used on the framebuffer.
+            This flag will usually be set unless the driver wishes
+            to prohibit this for some reason.
+
+			</para></listitem></varlistentry>
+
+		    <varlistentry>
+		      <term><constant>DGA_INTERLACED
+			  DGA_DOUBLESCAN</constant></term>
+		      <listitem><para>
+            Indicates that these are interlaced or double scan modes.
+
+			</para></listitem></varlistentry>
+		  </variablelist>
+		</para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>imageWidth
+		imageHeight</structfield></term>
+	    <listitem><para>
+		    These are the dimensions of the linear framebuffer
+                     accessible by the client.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>pixmapWidth
+		pixmapHeight</structfield></term>
+	    <listitem><para>
+		     These are the dimensions of the area of the
+                     framebuffer accessible by the graphics accelerator.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>bytesPerScanline</structfield></term>
+	    <listitem><para>
+		      Pitch of the framebuffer in bytes.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>byteOrder</structfield></term>
+	    <listitem><para>
+		     Usually the same as
+		     <structfield>pScrn-&gt;imageByteOrder</structfield>.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>depth</structfield></term>
+	    <listitem><para>
+		     The depth of the framebuffer in this mode.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>bitsPerPixel</structfield></term>
+	    <listitem><para>
+		      The number of bits per pixel in this mode.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>red_mask</structfield></term>
+	    <term><structfield>green_mask</structfield></term>
+	    <term><structfield>blue_mask</structfield></term>
+	    <listitem><para>
+		      The RGB masks for this mode, if applicable.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>viewportWidth</structfield></term>
+	    <term><structfield>viewportHeight</structfield></term>
+	    <listitem><para>
+		      Dimensions of the visible part of the framebuffer.
+		      Usually <structfield>mode-&gt;HDisplay</structfield> and
+		      <structfield>mode-&gt;VDisplay</structfield>.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>xViewportStep
+		yViewportStep</structfield></term>
+	    <listitem><para>
+		     The granularity of x and y viewport positions that
+                     the driver supports in this mode.
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>maxViewportX
+		maxViewportY</structfield></term>
+	    <listitem><para>
+		      The maximum viewport position supported by the
+                       driver in this mode.
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>viewportFlags</structfield></term>
+	    <listitem><para>
+		     The following may be OR'd together:
+
+		<variablelist>
+		  <varlistentry>
+		    <term><constant>DGA_FLIP_IMMEDIATE</constant></term>
+		    <listitem><para>
+		The driver supports immediate viewport changes.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><constant>DGA_FLIP_RETRACE</constant></term>
+
+		    <listitem><para>
+		The driver supports viewport changes at retrace.
+		      </para></listitem></varlistentry>
+		  </variablelist>
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>offset</structfield></term>
+	    <listitem><para>
+	        The offset into the linear framebuffer that corresponds to
+                pixel (0,0) for this mode.
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>address</structfield></term>
+	    <listitem><para>
+                The virtual address of the framebuffer as mapped by the driver.
+                This is needed when DGA_PIXMAP_AVAILABLE is set.
+	      </para></listitem></varlistentry>
+
+	</variablelist>
+
+	<programlisting>
+/** The DGAFunctionRec **/
+
+typedef struct {
+  Bool (*OpenFramebuffer)(
+       ScrnInfoPtr pScrn,
+       char **name,
+       unsigned char **mem,
+       int *size,
+       int *offset,
+       int *extra
+  );
+  void (*CloseFramebuffer)(ScrnInfoPtr pScrn);
+  Bool (*SetMode)(ScrnInfoPtr pScrn, DGAModePtr pMode);
+  void (*SetViewport)(ScrnInfoPtr pScrn, int x, int y, int flags);
+  int  (*GetViewport)(ScrnInfoPtr pScrn);
+  void (*Sync)(ScrnInfoPtr);
+  void (*FillRect)(
+       ScrnInfoPtr pScrn,
+       int x, int y, int w, int h,
+       unsigned long color
+  );
+  void (*BlitRect)(
+       ScrnInfoPtr pScrn,
+       int srcx, int srcy,
+       int w, int h,
+       int dstx, int dsty
+  );
+  void (*BlitTransRect)(
+       ScrnInfoPtr pScrn,
+       int srcx, int srcy,
+       int w, int h,
+       int dstx, int dsty,
+       unsigned long color
+  );
+} DGAFunctionRec, *DGAFunctionPtr;
+	</programlisting>
+
+
+	<blockquote><para>
+	    <programlisting>
+    Bool OpenFramebuffer (pScrn, name, mem, size, offset, extra);
+	    </programlisting>
+	    <blockquote><para>
+      <function>OpenFramebuffer()</function> should pass the client everything
+      it needs to know to be able to open the framebuffer.  These
+      parameters are OS specific and their meanings are to be interpreted
+      by an OS specific client library.
+
+		<variablelist>
+		  <varlistentry>
+		    <term><parameter>name</parameter></term>
+		    <listitem><para>
+	      The name of the device to open or <constant>NULL</constant> if
+	      there is no special device to open.  A <constant>NULL</constant>
+	      name tells the client that it should open whatever device
+	      one would usually open to access physical memory.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><parameter>mem</parameter></term>
+		    <listitem><para>
+	      The physical address of the start of the framebuffer.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><parameter>size</parameter></term>
+		    <listitem><para>
+	      The size of the framebuffer in bytes.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><parameter>offset</parameter></term>
+		    <listitem><para>
+	      Any offset into the device, if applicable.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><parameter>flags</parameter></term>
+		    <listitem><para>
+	      Any additional information that the client may need.
+	      Currently, only the <constant>DGA_NEED_ROOT</constant> flag is
+	      defined.
+		      </para></listitem></varlistentry>
+
+		</variablelist>
+	      </para></blockquote>
+	  </para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    void CloseFramebuffer (pScrn);
+	    </programlisting>
+	    <blockquote><para>
+      <function>CloseFramebuffer()</function> merely informs the driver (if it
+      even cares) that client no longer needs to access the framebuffer
+      directly.  This function is optional.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    Bool SetMode (pScrn, pMode);
+	    </programlisting>
+	    <blockquote><para>
+      <function>SetMode()</function> tells the driver to initialize the mode
+      passed to it.  If <parameter>pMode</parameter> is <constant>NULL</constant>,
+      then the driver should restore the original pre-DGA mode.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    void SetViewport (pScrn, x, y, flags);
+	    </programlisting>
+	    <blockquote><para>
+      <function>SetViewport()</function> tells the driver to make the upper
+      left-hand corner of the visible screen correspond to coordinate
+      <literal remap="tt">(x,y)</literal> on the framebuffer.  <parameter>flags</parameter>
+      currently defined are:
+
+		<variablelist>
+		  <varlistentry>
+		    <term><constant>DGA_FLIP_IMMEDIATE</constant></term>
+		    <listitem><para>
+	    The viewport change should occur immediately.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><constant>DGA_FLIP_RETRACE</constant></term>
+		    <listitem><para>
+	    The viewport change should occur at the
+            vertical retrace, but this function should
+            return sooner if possible.
+			</para></listitem></varlistentry>
+		</variablelist>
+	      </para>
+
+	      <para>
+      The <literal remap="tt">(x,y)</literal> locations will be passed as the client
+      specified them, however, the driver is expected to round these
+      locations down to the next supported location as specified by the
+      <structfield>xViewportStep</structfield> and <structfield>yViewportStep</structfield>
+      for the current mode.
+	      </para>
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    int GetViewport (pScrn);
+	    </programlisting>
+	    <blockquote><para>
+      <function>GetViewport()</function> gets the current page flip status.
+      Set bits in the returned int correspond to viewport change requests
+      still pending.  For instance, set bit zero if the last SetViewport
+      request is still pending, bit one if the one before that is still
+      pending, etc.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    void Sync (pScrn);
+	    </programlisting>
+	    <blockquote><para>
+      This function should ensure that any graphics accelerator operations
+      have finished.  This function should not return until the graphics
+      accelerator is idle.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    void FillRect (pScrn, x, y, w, h, color);
+	    </programlisting>
+	    <blockquote><para>
+      This optional function should fill a rectangle
+      <parameter>w&nbsp;&times;&nbsp;h</parameter> located at
+      <parameter>(x,y)</parameter> in the given color.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    void BlitRect (pScrn, srcx, srcy, w, h, dstx, dsty);
+	    </programlisting>
+	    <blockquote><para>
+      This optional function should copy an area
+      <parameter>w&nbsp;&times;&nbsp;h</parameter> located at
+      <parameter>(srcx,srcy)</parameter> to location <parameter>(dstx,dsty)</parameter>.
+      This function will need to handle copy directions as appropriate.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    void BlitTransRect (pScrn, srcx, srcy, w, h, dstx, dsty, color);
+	    </programlisting>
+	    <blockquote><para>
+      This optional function is the same as BlitRect except that pixels
+      in the source corresponding to the color key <parameter>color</parameter>
+      should be skipped.
+	      </para>
+
+	    </blockquote></para></blockquote>
+    </para></blockquote>
+
+  </sect1>
+
+  <sect1>
+    <title>The XFree86 X Video Extension (Xv) Device Dependent Layer</title>
+
+    <para>
+XFree86 offers the X Video Extension which allows clients to treat video
+as any another primitive and <quote>Put</quote> video into drawables.  By default,
+the extension reports no video adaptors as being available since the
+DDX layer has not been initialized.  The driver can initialize the DDX
+layer by filling out one or more <literal remap="tt">XF86VideoAdaptorRecs</literal>
+as described later in this document and passing a list of
+<literal remap="tt">XF86VideoAdaptorPtr</literal> pointers to the following function:
+
+      <programlisting>
+    Bool xf86XVScreenInit(ScreenPtr pScreen,
+                          XF86VideoAdaptorPtr *adaptPtrs,
+                          int num);
+      </programlisting>
+    </para>
+
+    <para>
+After doing this, the extension will report video adaptors as being
+available, providing the data in their respective
+<literal remap="tt">XF86VideoAdaptorRecs</literal> was valid.
+<function>xf86XVScreenInit()</function> <emphasis>copies</emphasis> data from the structure
+passed to it so the driver may free it after the initialization.  At
+the moment, the DDX only supports rendering into Window drawables.
+Pixmap rendering will be supported after a sufficient survey of suitable
+hardware is completed.
+    </para>
+
+    <para>
+The <structname>XF86VideoAdaptorRec</structname>:
+
+      <programlisting>
+typedef struct {
+	unsigned int type;
+	int flags;
+	char *name;
+	int nEncodings;
+	XF86VideoEncodingPtr pEncodings;
+	int nFormats;
+	XF86VideoFormatPtr pFormats;
+	int nPorts;
+	DevUnion *pPortPrivates;
+	int nAttributes;
+	XF86AttributePtr pAttributes;
+	int nImages;
+	XF86ImagePtr pImages;
+	PutVideoFuncPtr PutVideo;
+	PutStillFuncPtr PutStill;
+	GetVideoFuncPtr GetVideo;
+	GetStillFuncPtr GetStill;
+	StopVideoFuncPtr StopVideo;
+	SetPortAttributeFuncPtr SetPortAttribute;
+	GetPortAttributeFuncPtr GetPortAttribute;
+	QueryBestSizeFuncPtr QueryBestSize;
+	PutImageFuncPtr PutImage;
+	QueryImageAttributesFuncPtr QueryImageAttributes;
+} XF86VideoAdaptorRec, *XF86VideoAdaptorPtr;
+      </programlisting></para>
+
+    <para>
+Each adaptor will have its own XF86VideoAdaptorRec.  The fields are
+as follows:
+
+      <variablelist>
+	<varlistentry>
+	  <term><structfield>type</structfield></term>
+	  <listitem><para>
+	This can be any of the following flags OR'd together.
+
+	      <variablelist>
+		<varlistentry>
+		  <term><constant>XvInputMask</constant>
+		    <constant>XvOutputMask</constant></term>
+		  <listitem><para>
+	    These refer to the target drawable and are similar to a Window's
+	    class. <literal remap="tt">XvInputMask</literal> indicates that the adaptor
+	    can put video into a drawable.  <literal remap="tt">XvOutputMask</literal>
+	    indicates that the adaptor can get video from a drawable.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><constant>XvVideoMask</constant>
+		    <constant>XvStillMask</constant>
+		    <constant>XvImageMask</constant></term>
+		  <listitem><para>
+	    These indicate that the adaptor supports video, still or
+	    image primitives respectively.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><constant>XvWindowMask</constant>
+		    <constant>XvPixmapMask</constant></term>
+		  <listitem><para>
+	    These indicate the types of drawables the adaptor is capable
+	    of rendering into.  At the moment, Pixmap rendering is not
+	    supported and the <constant>XvPixmapMask</constant> flag is ignored.
+		    </para></listitem></varlistentry>
+	      </variablelist>
+
+	    </para></listitem></varlistentry>
+
+	<varlistentry>
+	  <term><structfield>flags</structfield></term>
+	  <listitem><para>
+	Currently, the following flags are defined:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><constant>VIDEO_NO_CLIPPING</constant></term>
+		  <listitem><para>
+	   This indicates that the video adaptor does not support
+	   clipping.  The driver will never receive <quote>Put</quote> requests
+	   where less than the entire area determined by
+	   <parameter>drw_x</parameter>, <parameter>drw_y</parameter>,
+	   <parameter>drw_w</parameter> and <parameter>drw_h</parameter> is visible.
+	   This flag does not apply to <quote>Get</quote> requests.  Hardware
+	   that is incapable of clipping <quote>Gets</quote> may punt or get
+	   the extents of the clipping region passed to it.
+		    </para></listitem>
+
+		</varlistentry>
+
+		<varlistentry>
+		  <term><constant>VIDEO_INVERT_CLIPLIST</constant></term>
+		  <listitem><para>
+	   This indicates that the video driver requires the clip
+	   list to contain the regions which are obscured rather
+	   than the regions which are are visible.
+		    </para></listitem>
+
+		</varlistentry>
+
+		<varlistentry>
+		  <term><constant>VIDEO_OVERLAID_STILLS</constant></term>
+		  <listitem><para>
+	   Implementing PutStill for hardware that does video as an
+	   overlay can be awkward since it's unclear how long to leave
+	   the video up for.  When this flag is set, StopVideo will be
+	   called whenever the destination gets clipped or moved so that
+	   the still can be left up until then.
+		    </para></listitem>
+
+		</varlistentry>
+
+		<varlistentry>
+		  <term><constant>VIDEO_OVERLAID_IMAGES</constant></term>
+		  <listitem><para>
+	   Same as <constant>VIDEO_OVERLAID_STILLS</constant> but for images.
+		    </para></listitem>
+		</varlistentry>
+
+		<varlistentry>
+		  <term><constant>VIDEO_CLIP_TO_VIEWPORT</constant></term>
+		  <listitem><para>
+	    Indicates that the clip region passed to the driver functions
+	    should be clipped to the visible portion of the screen in the
+	    case where the viewport is smaller than the virtual desktop.
+		    </para></listitem></varlistentry>
+
+	      </variablelist>
+	    </para></listitem></varlistentry>
+
+	<varlistentry>
+	  <term><structfield>name</structfield></term>
+	  <listitem><para>
+	The name of the adaptor.
+	    </para></listitem></varlistentry>
+
+
+	<varlistentry>
+	  <term><structfield>nEncodings</structfield>
+	    <structfield>pEncodings</structfield></term>
+	  <listitem><para>
+	The number of encodings the adaptor is capable of and pointer
+	to the <structname>XF86VideoEncodingRec</structname> array.  The
+	<structname>XF86VideoEncodingRec</structname> is described later on.
+	For drivers that only support XvImages there should be an encoding
+	named "XV_IMAGE" and the width and height should specify
+	the maximum size source image supported.
+	  </para></listitem></varlistentry>
+
+
+	<varlistentry>
+	  <term><structfield>nFormats</structfield>
+	      <structfield>pFormats</structfield></term>
+	  <listitem><para>
+	The number of formats the adaptor is capable of and pointer to
+	the <structname>XF86VideoFormatRec</structname> array.  The
+	<structname>XF86VideoFormatRec</structname> is described later on.
+	    </para></listitem></varlistentry>
+
+
+	<varlistentry>
+	  <term><structfield>nPorts</structfield>
+	    <structfield>pPortPrivates</structfield></term>
+	  <listitem><para>
+	The number of ports is the number of separate data streams which
+	the adaptor can handle simultaneously.  If you have more than
+	one port, the adaptor is expected to be able to render into more
+	than one window at a time.  <structfield>pPortPrivates</structfield> is
+	an array of pointers or ints - one for each port.  A port's
+	private data will be passed to the driver any time the port is
+	requested to do something like put the video or stop the video.
+	In the case where there may be many ports, this enables the
+	driver to know which port the request is intended for.  Most
+	commonly, this will contain a pointer to the data structure
+	containing information about the port.  In Xv, all ports on
+	a particular adaptor are expected to be identical in their
+	functionality.
+	    </para></listitem></varlistentry>
+
+
+	<varlistentry>
+	  <term><structfield>nAttributes</structfield>
+	    <structfield>pAttributes</structfield></term>
+	  <listitem><para>
+	The number of attributes recognized by the adaptor and a pointer to
+	the array of <structname>XF86AttributeRecs</structname>.  The
+	<structname>XF86AttributeRec</structname> is described later on.
+	    </para></listitem></varlistentry>
+
+
+	<varlistentry>
+	  <term><structfield>nImages</structfield>
+	    <structfield>pImages</structfield></term>
+	  <listitem><para>
+	The number of <structname>XF86ImageRecs</structname> supported by the adaptor
+	and a pointer to the array of <structname>XF86ImageRecs</structname>. The
+	<structname>XF86ImageRec</structname> is described later on.
+	    </para></listitem></varlistentry>
+
+
+	<varlistentry>
+	  <term><structfield>
+     PutVideo PutStill GetVideo GetStill StopVideo
+     SetPortAttribute GetPortAttribute QueryBestSize PutImage
+     QueryImageAttributes
+	    </structfield></term>
+	  <listitem><para>
+	These functions define the DDX-&gt;driver interface.  In each
+	case, the pointer <parameter>data</parameter> is passed to the driver.
+	This is the port private for that port as described above.  All
+	fields are required except under the following conditions:
+
+	      <orderedlist>
+		<listitem><para>
+	     <structfield>PutVideo</structfield>, <structfield>PutStill</structfield> and
+	     the image routines <structfield>PutImage</structfield> and
+	     <structfield>QueryImageAttributes</structfield> are not required when the
+	     adaptor type does not contain <constant>XvInputMask</constant>.
+		  </para></listitem>
+
+		<listitem><para>
+	     <structfield>GetVideo</structfield> and <structfield>GetStill</structfield>
+	     are not required when the adaptor type does not contain
+	     <constant>XvOutputMask</constant>.
+		  </para></listitem>
+
+		<listitem><para>
+	     <structfield>GetVideo</structfield> and <structfield>PutVideo</structfield>
+	     are not required when the adaptor type does not contain
+	     <constant>XvVideoMask</constant>.
+		  </para></listitem>
+
+		<listitem><para>
+	     <structfield>GetStill</structfield> and <structfield>PutStill</structfield>
+	     are not required when the adaptor type does not contain
+	     <constant>XvStillMask</constant>.
+		  </para></listitem>
+
+		<listitem><para>
+	     <structfield>PutImage</structfield> and <structfield>QueryImageAttributes</structfield>
+	     are not required when the adaptor type does not contain
+	     <constant>XvImageMask</constant>.
+		  </para></listitem>
+
+	      </orderedlist>
+
+	    </para>
+
+	    <para>
+	With the exception of <structfield>QueryImageAttributes</structfield>, these
+	functions should return <constant>Success</constant> if the operation was
+	completed successfully.  They can return <constant>XvBadAlloc</constant>
+	otherwise. <structfield>QueryImageAttributes</structfield> returns the size
+	of the XvImage queried.
+	    </para>
+
+	    <para>
+	If the <constant>VIDEO_NO_CLIPPING</constant>
+	flag is set, the <literal remap="tt">clipBoxes</literal> may be ignored by
+	the driver.  <literal remap="tt">ClipBoxes</literal> is an <literal remap="tt">X-Y</literal>
+	banded region identical to those used throughout the server.
+	The clipBoxes represent the visible portions of the area determined
+	by <literal remap="tt">drw_x</literal>, <literal remap="tt">drw_y</literal>,
+	<literal remap="tt">drw_w</literal> and <literal remap="tt">drw_h</literal> in the Get/Put
+	function.  The boxes are in screen coordinates, are guaranteed
+	not to overlap and an empty region will never be passed.
+	If the driver has specified <constant>VIDEO_INVERT_CLIPLIST</constant>,
+	<literal remap="tt">clipBoxes</literal> will indicate the areas of the primitive
+	which are obscured rather than the areas visible.
+
+	    </para></listitem></varlistentry>
+      </variablelist>
+
+      <blockquote><para>
+	  <programlisting>
+    typedef  int (* PutVideoFuncPtr)( ScrnInfoPtr pScrn,
+                   short vid_x, short vid_y, short drw_x, short drw_y,
+                   short vid_w, short vid_h, short drw_w, short drw_h,
+                   RegionPtr clipBoxes, pointer data );
+	  </programlisting>
+	      <blockquote><para>
+	  This indicates that the driver should take a subsection
+	  <parameter>vid_w</parameter> by <parameter>vid_h</parameter> at location
+	  <parameter>(vid_x,vid_y)</parameter> from the video stream and direct
+	  it into the rectangle <parameter>drw_w</parameter> by <parameter>drw_h</parameter>
+	  at location <parameter>(drw_x,drw_y)</parameter> on the screen, scaling as
+	  necessary.  Due to the large variations in capabilities of
+	  the various hardware expected to be used with this extension,
+	  it is not expected that all hardware will be able to do this
+	  exactly as described.  In that case the driver should just do
+	  <quote>the best it can,</quote> scaling as closely to the target rectangle
+	  as it can without rendering outside of it.  In the worst case,
+	  the driver can opt to just not turn on the video.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    typedef  int (* PutStillFuncPtr)( ScrnInfoPtr pScrn,
+                   short vid_x, short vid_y, short drw_x, short drw_y,
+                   short vid_w, short vid_h, short drw_w, short drw_h,
+                   RegionPtr clipBoxes, pointer data );
+	      </programlisting>
+	      <blockquote><para>
+	  This is same as <structfield>PutVideo</structfield> except that the driver
+	  should place only one frame from the stream on the screen.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    typedef int (* GetVideoFuncPtr)( ScrnInfoPtr pScrn,
+                  short vid_x, short vid_y, short drw_x, short drw_y,
+                  short vid_w, short vid_h, short drw_w, short drw_h,
+                  RegionPtr clipBoxes, pointer data );
+	      </programlisting>
+	      <blockquote><para>
+	  This is same as <structfield>PutVideo</structfield> except that the driver
+	  gets video from the screen and outputs it.  The driver should
+	  do the best it can to get the requested dimensions correct
+	  without reading from an area larger than requested.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    typedef int (* GetStillFuncPtr)( ScrnInfoPtr pScrn,
+                  short vid_x, short vid_y, short drw_x, short drw_y,
+                  short vid_w, short vid_h, short drw_w, short drw_h,
+                  RegionPtr clipBoxes, pointer data );
+	      </programlisting>
+	      <blockquote><para>
+	  This is the same as <literal remap="tt">GetVideo</literal> except that the
+	  driver should place only one frame from the screen into the
+	  output stream.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	      <programlisting>
+    typedef void (* StopVideoFuncPtr)(ScrnInfoPtr pScrn,
+                                      pointer data, Bool cleanup);
+	      </programlisting>
+	      <blockquote><para>
+	  This indicates the driver should stop displaying the video.
+	  This is used to stop both input and output video.  The
+	  <parameter>cleanup</parameter> field indicates that the video is
+	  being stopped because the client requested it to stop or
+	  because the server is exiting the current VT.  In that case
+	  the driver should deallocate any offscreen memory areas (if
+	  there are any) being used to put the video to the screen.  If
+	  <parameter>cleanup</parameter> is not set, the video is being stopped
+	  temporarily due to clipping or moving of the window, etc...
+	  and video will likely be restarted soon so the driver should
+	  not deallocate any offscreen areas associated with that port.
+	      </para>
+
+	    </blockquote></para></blockquote>
+	  <blockquote><para>
+	      <programlisting>
+    typedef int (* SetPortAttributeFuncPtr)(ScrnInfoPtr pScrn,
+                                Atom attribute,INT32 value, pointer data);
+	      </programlisting>
+
+	      <programlisting>
+    typedef int (* GetPortAttributeFuncPtr)(ScrnInfoPtr pScrn,
+                                Atom attribute,INT32 *value, pointer data);
+	      </programlisting>
+	      <blockquote><para>
+	  A port may have particular attributes such as hue,
+	  saturation, brightness or contrast.  Xv clients set and
+	  get these attribute values by sending attribute strings
+	  (Atoms) to the server.  Such requests end up at these
+	  driver functions.  It is recommended that the driver provide
+	  at least the following attributes mentioned in the Xv client
+	  library docs:
+		<literallayout><constant>
+		XV_ENCODING
+		XV_HUE
+		XV_SATURATION
+		XV_BRIGHTNESS
+		XV_CONTRAST
+		  </constant></literallayout>
+	  but the driver may recognize as many atoms as it wishes.  If
+	  a requested attribute is unknown by the driver it should return
+	  <constant>BadMatch</constant>.  <constant>XV_ENCODING</constant> is the
+	  attribute intended to let the client specify which video
+	  encoding the particular port should be using (see the description
+	  of <structname>XF86VideoEncodingRec</structname> below).  If the
+	  requested encoding is unsupported, the driver should return
+	  <constant>XvBadEncoding</constant>.  If the value lies outside the
+	  advertised range <constant>BadValue</constant> may be returned.
+	  <constant>Success</constant> should be returned otherwise.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	  <blockquote><para>
+	    <programlisting>
+    typedef void (* QueryBestSizeFuncPtr)(ScrnInfoPtr pScrn,
+                   Bool motion, short vid_w, short vid_h,
+                   short drw_w, short drw_h,
+                   unsigned int *p_w, unsigned int *p_h, pointer data);
+	    </programlisting>
+	    <blockquote><para>
+	   <function>QueryBestSize</function> provides the client with a way
+	   to query what the destination dimensions would end up being
+	   if they were to request that an area
+	   <parameter>vid_w</parameter> by <parameter>vid_h</parameter> from the video
+	   stream be scaled to rectangle of
+	   <parameter>drw_w</parameter> by <parameter>drw_h</parameter> on the screen.
+	   Since it is not expected that all hardware will be able to
+	   get the target dimensions exactly, it is important that the
+	   driver provide this function.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    typedef  int (* PutImageFuncPtr)( ScrnInfoPtr pScrn,
+                   short src_x, short src_y, short drw_x, short drw_y,
+                   short src_w, short src_h, short drw_w, short drw_h,
+                   int image, char *buf, short width, short height,
+                   Bool sync, RegionPtr clipBoxes, pointer data );
+	      </programlisting>
+	      <blockquote><para>
+	  This is similar to <structfield>PutStill</structfield> except that the
+	  source of the video is not a port but the data stored in a system
+	  memory buffer at <parameter>buf</parameter>.  The data is in the format
+	  indicated by the <parameter>image</parameter> descriptor and represents a
+	  source of size <parameter>width</parameter> by <parameter>height</parameter>.
+	  If <parameter>sync</parameter> is TRUE the driver should not return
+	  from this function until it is through reading the data
+	  from <parameter>buf</parameter>.  Returning when <parameter>sync</parameter>
+	  is TRUE indicates that it is safe for the data at <parameter>buf</parameter>
+	  to be replaced, freed, or modified.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    typedef  int (* QueryImageAttributesFuncPtr)( ScrnInfoPtr pScrn,
+                                int image, short *width, short *height,
+                                int *pitches, int *offsets);
+	    </programlisting>
+	    <blockquote><para>
+	  This function is called to let the driver specify how data for
+	  a particular <parameter>image</parameter> of size <parameter>width</parameter>
+	  by <parameter>height</parameter> should be stored.  Sometimes only
+	  the size and corrected width and height are needed.  In that
+	  case <parameter>pitches</parameter> and <parameter>offsets</parameter> are
+	  NULL.  The size of the memory required for the image is returned
+	  by this function.  The <parameter>width</parameter> and
+	  <parameter>height</parameter> of the requested image can be altered by
+	  the driver to reflect format limitations (such as component
+	  sampling periods that are larger than one).  If
+	  <parameter>pitches</parameter> and <parameter>offsets</parameter> are not NULL,
+	  these will be arrays with as many elements in them as there
+	  are planes in the <parameter>image</parameter> format.  The driver
+	  should specify the pitch (in bytes) of each scanline in the
+	  particular plane as well as the offset to that plane (in bytes)
+	  from the beginning of the image.
+	      </para>
+
+	  </blockquote></para></blockquote>
+    </para>
+
+    <para>
+The XF86VideoEncodingRec:
+
+      <blockquote><para>
+	  <programlisting>
+typedef struct {
+	int id;
+	char *name;
+	unsigned short width, height;
+	XvRationalRec rate;
+} XF86VideoEncodingRec, *XF86VideoEncodingPtr;
+
+	  </programlisting>
+	  <blockquote><para>
+   The <structname>XF86VideoEncodingRec</structname> specifies what encodings
+   the adaptor can support.  Most of this data is just informational
+   and for the client's benefit, and is what will be reported by
+   <function>XvQueryEncodings</function>.  The <parameter>id</parameter> field is
+   expected to be a unique identifier to allow the client to request a
+   certain encoding via the <constant>XV_ENCODING</constant> attribute string.
+
+	    </para>
+	  </blockquote></para></blockquote>
+    </para>
+
+    <para>
+The XF86VideoFormatRec:
+
+      <blockquote><para>
+	  <programlisting>
+typedef struct {
+	char  depth;
+	short class;
+} XF86VideoFormatRec, *XF86VideoFormatPtr;
+
+	  </programlisting>
+	  <blockquote><para>
+    This specifies what visuals the video is viewable in.
+    <parameter>depth</parameter> is the depth of the visual (not bpp).
+    <parameter>class</parameter> is the visual class such as
+    <constant>TrueColor</constant>, <constant>DirectColor</constant> or
+    <constant>PseudoColor</constant>.  Initialization of an adaptor will fail
+    if none of the visuals on that screen are supported.
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </para>
+
+    <para>
+The XF86AttributeRec:
+
+      <blockquote><para>
+	  <programlisting>
+typedef struct {
+	int   flags;
+	int   min_value;
+	int   max_value;
+	char  *name;
+} XF86AttributeListRec, *XF86AttributeListPtr;
+
+	  </programlisting>
+	  <blockquote><para>
+   Each adaptor may have an array of these advertising the attributes
+   for its ports.  Currently defined flags are <literal remap="tt">XvGettable</literal>
+   and <literal remap="tt">XvSettable</literal> which may be OR'd together indicating that
+   attribute is <quote>gettable</quote> or <quote>settable</quote> by the client.  The
+   <literal remap="tt">min</literal> and <literal remap="tt">max</literal> field specify the valid range
+   for the value.  <literal remap="tt">Name</literal> is a text string describing the
+   attribute by name.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+    </para>
+
+    <para>
+The XF86ImageRec:
+
+	<blockquote><para>
+	    <programlisting>
+typedef struct {
+	int id;
+	int type;
+	int byte_order;
+	char guid[16];
+	int bits_per_pixel;
+	int format;
+	int num_planes;
+
+	/* for RGB formats */
+	int depth;
+	unsigned int red_mask;
+	unsigned int green_mask;
+	unsigned int blue_mask;
+
+	/* for YUV formats */
+	unsigned int y_sample_bits;
+	unsigned int u_sample_bits;
+	unsigned int v_sample_bits;
+	unsigned int horz_y_period;
+	unsigned int horz_u_period;
+	unsigned int horz_v_period;
+	unsigned int vert_y_period;
+	unsigned int vert_u_period;
+	unsigned int vert_v_period;
+	char component_order[32];
+	int scanline_order;
+} XF86ImageRec, *XF86ImagePtr;
+
+	    </programlisting>
+	    <blockquote><para>
+   XF86ImageRec describes how video source data is laid out in memory.
+   The fields are as follows:
+
+		<variablelist>
+		  <varlistentry>
+		    <term><structfield>id</structfield></term>
+		    <listitem><para>
+	This is a unique descriptor for the format.  It is often good to
+        set this value to the FOURCC for the format when applicable.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>type</structfield></term>
+		    <listitem><para>
+	This is <constant>XvRGB</constant> or <constant>XvYUV</constant>.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>byte_order</structfield></term>
+		    <listitem><para>
+	This is <constant>LSBFirst</constant> or <constant>MSBFirst</constant>.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>guid</structfield></term>
+		    <listitem><para>
+	This is the Globally Unique IDentifier for the format.  When
+	not applicable, all characters should be NULL.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>bits_per_pixel</structfield></term>
+		    <listitem><para>
+	The number of bits taken up (but not necessarily used) by each
+	pixel.  Note that for some planar formats which have fractional
+	bits per pixel (such as IF09) this number may be rounded _down_.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>format</structfield></term>
+		    <listitem><para>
+	This is <constant>XvPlanar</constant> or <constant>XvPacked</constant>.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>num_planes</structfield></term>
+		    <listitem><para>
+	The number of planes in planar formats.  This should be set to
+	one for packed formats.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>depth</structfield></term>
+		    <listitem><para>
+	The significant bits per pixel in RGB formats (analgous to the
+	depth of a pixmap format).
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>red_mask</structfield></term>
+		    <term><structfield>green_mask</structfield></term>
+		    <term><structfield>blue_mask</structfield></term>
+		    <listitem><para>
+	The red, green and blue bitmasks for packed RGB formats.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>y_sample_bits</structfield></term>
+		    <term><structfield>u_sample_bits</structfield></term>
+		    <term><structfield>v_sample_bits</structfield></term>
+		    <listitem><para>
+	The y, u and v sample sizes (in bits).
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>horz_y_period</structfield></term>
+		    <term><structfield>horz_u_period</structfield></term>
+		    <term><structfield>horz_v_period</structfield></term>
+		    <listitem><para>
+	The y, u and v sampling periods in the horizontal direction.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>vert_y_period</structfield></term>
+		    <term><structfield>vert_u_period</structfield></term>
+		    <term><structfield>vert_v_period</structfield></term>
+		    <listitem><para>
+	The y, u and v sampling periods in the vertical direction.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>component_order</structfield></term>
+		    <listitem><para>
+	Uppercase ascii characters representing the order that
+	samples are stored within packed formats.  For planar formats
+	this represents the ordering of the planes.  Unused characters
+	in the 32 byte string should be set to NULL.
+		      </para></listitem></varlistentry>
+
+		  <varlistentry>
+		    <term><structfield>scanline_order</structfield></term>
+		    <listitem><para>
+	This is <constant>XvTopToBottom</constant> or <constant>XvBottomToTop</constant>.
+		      </para></listitem></varlistentry>
+
+		  </variablelist>
+	    </para>
+
+	    <para>
+  Since some formats (particular some planar YUV formats) may not
+be completely defined by the parameters above, the guid, when
+available, should provide the most accurate description of the
+format.
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </para>
+  </sect1>
+
+  <sect1>
+    <title>The Loader</title>
+
+    <para>
+This section describes the interfaces to the module loader.  The loader
+interfaces can be divided into two groups: those that are only available to
+the XFree86 common layer, and those that are also available to modules.
+    </para>
+
+    <sect2>
+      <title>Loader Overview</title>
+
+      <para>
+The loader is capable of loading modules in a range of object formats,
+and knowledge of these formats is built in to the loader.  Knowledge of
+new object formats can be added to the loader in a straightforward
+manner.  This makes it possible to provide OS-independent modules (for
+a given CPU architecture type).  In addition to this, the loader can
+load modules via the OS-provided <function>dlopen(3)</function> service where
+available.  Such modules are not platform independent, and the semantics
+of <function>dlopen()</function> on most systems results in significant
+limitations in the use of modules of this type.  Support for
+<function>dlopen()</function> modules in the loader is primarily for
+experimental and development purposes.
+      </para>
+
+      <para>
+Symbols exported by the loader (on behalf of the core X server) to
+modules are determined at compile time.  Only those symbols explicitly
+exported are available to modules.  All external symbols of loaded
+modules are exported to other modules, and to the core X server.  The
+loader can be requested to check for unresolved symbols at any time,
+and the action to be taken for unresolved symbols can be controlled by
+the caller of the loader.  Typically the caller identifies which symbols
+can safely remain unresolved and which cannot.
+      </para>
+
+      <para>
+NOTE:  Now that ISO-C allows pointers to functions and pointers to data to
+have different internal representations, some of the following interfaces
+will need to be revisited.
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Semi-private Loader Interface</title>
+
+      <para>
+The following is the semi-private loader interface that is available to the
+XFree86 common layer.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoaderInit(void);
+	  </programlisting>
+	  <blockquote><para>
+    The <function>LoaderInit()</function> function initialises the loader,
+    and it must be called once before calling any other loader functions.
+    This function initialises the tables of exported symbols, and anything
+    else that might need to be initialised.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoaderSetPath(const char *path);
+	  </programlisting>
+	  <blockquote><para>
+    The <function>LoaderSetPath()</function> function initialises a default
+    module search path.  This must be called if calls to other functions
+    are to be made without explicitly specifying a module search path.
+    The search path <parameter>path</parameter> must be a string of one or more
+    comma separated absolute paths.  Modules are expected to be located
+    below these paths, possibly in subdirectories of these paths.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    pointer LoadModule(const char *module, const char *path,
+                       const char **subdirlist, const char **patternlist,
+                       pointer options, const XF86ModReqInfo * modreq,
+                       int *errmaj, int *errmin);
+	  </programlisting>
+	  <blockquote><para>
+    The <function>LoadModule()</function> function loads the module called
+    <parameter>module</parameter>.  The return value is a module handle, and
+    may be used in future calls to the loader that require a reference
+    to a loaded module.  The module name <parameter>module</parameter> is
+    normally the module's canonical name, which doesn't contain any
+    directory path information, or any object/library file prefixes of
+    suffixes.  Currently a full pathname and/or filename is also accepted.
+    This might change.  The other parameters are:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><parameter>path</parameter></term>
+		  <listitem><para>
+		  An optional comma-separated list of module search paths.
+		  When <constant>NULL</constant>, the default search path is used.
+		    </para></listitem></varlistentry>
+
+
+		<varlistentry>
+		  <term><parameter>subdirlist</parameter></term>
+		  <listitem><para>
+		  An optional <constant>NULL</constant> terminated list of
+		  subdirectories to search.  When <constant>NULL</constant>,
+		  the default built-in list is used (refer to
+		  <varname>stdSubdirs</varname> in <filename>loadmod.c</filename>).
+		  The default list is also substituted for entries in
+		  <parameter>subdirlist</parameter> with the value
+		  <constant>DEFAULT_LIST</constant>.  This makes is possible
+		  to augment the default list instead of replacing it.
+		  Subdir elements must be relative, and must not contain
+		  <literal remap="tt">".."</literal>.  If any violate this requirement,
+		  the load fails.
+		    </para></listitem></varlistentry>
+
+
+		<varlistentry>
+		  <term><parameter>patternlist</parameter></term>
+		  <listitem><para>
+		  An optional <constant>NULL</constant> terminated list of
+		  POSIX regular expressions used to connect module
+		  filenames with canonical module names.  Each regex
+		  should contain exactly one subexpression that corresponds
+		  to the canonical module name.  When <constant>NULL</constant>,
+		  the default built-in list is used (refer to
+		  <varname>stdPatterns</varname> in
+		  <filename>loadmod.c</filename>).  The default list is also
+		  substituted for entries in <parameter>patternlist</parameter>
+		  with the value <constant>DEFAULT_LIST</constant>.  This
+		  makes it possible to augment the default list instead
+		  of replacing it.
+		    </para></listitem></varlistentry>
+
+
+		<varlistentry>
+		  <term><parameter>options</parameter></term>
+		  <listitem><para>
+		  An optional parameter that is passed to the newly
+		  loaded module's <literal remap="tt">SetupProc</literal> function
+		  (if it has one).  This argument is normally a
+		  <constant>NULL</constant> terminated list of
+		  <structname>Options</structname>, and must be interpreted that
+		  way by modules loaded directly by the XFree86 common
+		  layer.  However, it may be used for application-specific
+		  parameter passing in other situations.
+		    </para>
+
+		    <para>
+		  When loading <quote>external</quote> modules (modules that don't
+		  have the standard entry point, for example a
+		  special shared library) the options parameter can be
+		  set to <constant>EXTERN_MODULE</constant> to tell the
+		  loader not to reject the module when it doesn't find
+		  the standard entry point.
+		    </para></listitem></varlistentry>
+
+
+		<varlistentry>
+		  <term><parameter>modreq</parameter></term>
+		  <listitem><para>
+		  An optional <structname>XF86ModReqInfo*</structname> containing
+		  version/ABI/vendor information to requirements to
+		  check the newly loaded module against.  The main
+		  purpose of this is to allow the loader to verify that
+		  a module of the correct type/version before running
+		  its <function>SetupProc</function> function.
+		      </para>
+
+		    <para>
+		  The <literal remap="tt">XF86ModReqInfo</literal> struct is defined
+		  as follows:
+		      <programlisting>
+typedef struct {
+	CARD8        majorversion;  /* MAJOR_UNSPEC */
+	CARD8        minorversion;  /* MINOR_UNSPEC */
+	CARD16       patchlevel;    /* PATCH_UNSPEC */
+	const char * abiclass;      /* ABI_CLASS_NONE */
+	CARD32       abiversion;    /* ABI_VERS_UNSPEC */
+	const char * moduleclass;   /* MOD_CLASS_NONE */
+} XF86ModReqInfo;
+			</programlisting>
+
+		  The information here is compared against the equivalent
+		  information in the module's
+		  <structname>XF86ModuleVersionInfo</structname> record (which
+		  is described below).  The values in comments above
+		  indicate <quote>don't care</quote> settings for each of the fields.
+		  The comparisons made are as follows:
+
+		      <variablelist>
+			<varlistentry>
+			  <term><structfield>majorversion</structfield></term>
+			  <listitem><para>
+				   Must match the module's majorversion
+				   exactly.
+			    </para></listitem></varlistentry>
+
+			<varlistentry>
+			  <term><structfield>minorversion</structfield></term>
+			  <listitem><para>
+				   The module's minor version must be
+				   no less than this value.  This
+				   comparison is only made if
+				   <structfield>majorversion</structfield> is
+				   specified and matches.
+			    </para></listitem></varlistentry>
+
+			<varlistentry>
+			  <term><structfield>patchlevel</structfield></term>
+			  <listitem><para>
+				   The module's patchlevel must be no
+				   less than this value.  This comparison
+				   is only made if
+				   <structfield>minorversion</structfield> is
+				   specified and matches.
+			    </para></listitem></varlistentry>
+
+			<varlistentry>
+			  <term><structfield>abiclass</structfield></term>
+			  <listitem><para>
+				   String must match the module's abiclass
+				   string.
+			    </para></listitem></varlistentry>
+
+			<varlistentry>
+			  <term><structfield>abiversion</structfield></term>
+			  <listitem><para>
+				   Must be consistent with the module's
+				   abiversion (major equal, minor no
+				   older).
+			    </para></listitem></varlistentry>
+
+			<varlistentry>
+			  <term><structfield>moduleclass</structfield></term>
+			  <listitem><para>
+				   String must match the module's
+				   moduleclass string.
+			    </para></listitem></varlistentry>
+
+		      </variablelist>
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>errmaj</parameter></term>
+		  <listitem><para>
+		  An optional pointer to a variable holding the major
+		  part or the error code.  When provided,
+		  <parameter>*errmaj</parameter> is filled in when
+		  <function>LoadModule()</function> fails.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>errmin</parameter></term>
+		  <listitem><para>
+		  Like <parameter>errmaj</parameter>, but for the minor part
+		  of the error code.
+		    </para></listitem></varlistentry>
+
+	      </variablelist>
+
+	    </para></blockquote>
+	</para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void UnloadModule(pointer mod);
+	  </programlisting>
+	  <blockquote><para>
+    This function unloads the module referred to by the handle mod.
+    All child modules are also unloaded recursively.  This function must
+    not be used to directly unload modules that are child modules (i.e.,
+    those that have been loaded with the <function>LoadSubModule()</function>
+    described below).
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Module Requirements</title>
+
+      <para>
+Modules must provide information about themselves to the loader, and
+may optionally provide entry points for "setup" and "teardown" functions
+(those two functions are referred to here as <function>SetupProc</function>
+and <function>TearDownProc</function>).
+      </para>
+
+      <para>
+The module information is contained in the
+<structname>XF86ModuleVersionInfo</structname> struct, which is defined as follows:
+
+	<programlisting>
+typedef struct {
+    const char * modname;      /* name of module, e.g. "foo" */
+    const char * vendor;       /* vendor specific string */
+    CARD32       _modinfo1_;   /* constant MODINFOSTRING1/2 to find */
+    CARD32       _modinfo2_;   /* infoarea with a binary editor/sign tool */
+    CARD32       xf86version;  /* contains XF86_VERSION_CURRENT */
+    CARD8        majorversion; /* module-specific major version */
+    CARD8        minorversion; /* module-specific minor version */
+    CARD16       patchlevel;   /* module-specific patch level */
+    const char * abiclass;     /* ABI class that the module uses */
+    CARD32       abiversion;   /* ABI version */
+    const char * moduleclass;  /* module class */
+    CARD32       checksum[4];  /* contains a digital signature of the */
+                               /* version info structure */
+} XF86ModuleVersionInfo;
+	</programlisting>
+
+The fields are used as follows:
+
+	<variablelist>
+	  <varlistentry>
+	    <term><structfield>modname</structfield></term>
+	    <listitem><para>
+		The module's name.  This field is currently only for
+		informational purposes, but the loader may be modified
+		in future to require it to match the module's canonical
+                name.
+	      </para></listitem></varlistentry>
+
+
+	  <varlistentry>
+	    <term><structfield>vendor</structfield></term>
+	    <listitem><para>
+		The module vendor.  This field is for informational purposes
+                only.
+	      </para></listitem></varlistentry>
+
+
+	  <varlistentry>
+	    <term><structfield>_modinfo1_</structfield></term>
+	    <listitem><para>
+		This field holds the first part of a signature that can
+                be used to locate this structure in the binary.  It should
+		always be initialised to <constant>MODINFOSTRING1</constant>.
+	      </para></listitem></varlistentry>
+
+
+	  <varlistentry>
+	    <term><structfield>_modinfo2_</structfield></term>
+	    <listitem><para>
+		This field holds the second part of a signature that can
+                be used to locate this structure in the binary.  It should
+		always be initialised to <constant>MODINFOSTRING2</constant>.
+	      </para></listitem></varlistentry>
+
+
+	  <varlistentry>
+	    <term><structfield>xf86version</structfield></term>
+	    <listitem><para>
+		The XFree86 version against which the module was compiled.
+                This is mostly for informational/diagnostic purposes.  It
+		should be initialised to <constant>XF86_VERSION_CURRENT</constant>, which is
+		defined in <filename>xf86Version.h</filename>.
+	      </para></listitem></varlistentry>
+
+
+	  <varlistentry>
+	    <term><structfield>majorversion</structfield></term>
+	    <listitem><para>
+		The module-specific major version.  For modules where this
+		version is used for more than simply informational
+		purposes, the major version should only change (be
+		incremented) when ABI incompatibilities are introduced,
+		or ABI components are removed.
+	      </para></listitem></varlistentry>
+
+
+	  <varlistentry>
+	    <term><structfield>minorversion</structfield></term>
+	    <listitem><para>
+		The module-specific minor version.  For modules where this
+		version is used for more than simply informational
+		purposes, the minor version should only change (be
+		incremented) when ABI additions are made in a backward
+		compatible way.  It should be reset to zero when the major
+                version is increased.
+	      </para></listitem></varlistentry>
+
+
+	  <varlistentry>
+	    <term><structfield>patchlevel</structfield></term>
+	    <listitem><para>
+		The module-specific patch level.  The patch level should
+		increase with new revisions of the module where there
+		are no ABI changes, and it should be reset to zero when
+		the minor version is increased.
+	      </para></listitem></varlistentry>
+
+
+	  <varlistentry>
+	    <term><structfield>abiclass</structfield></term>
+	    <listitem><para>
+		The ABI class that the module requires.  The class is
+                specified as a string for easy extensibility.  It should
+		indicate which (if any) of the X server's built-in ABI
+		classes that the module relies on, or a third-party ABI
+                if appropriate.  Built-in ABI classes currently defined are:
+
+		<variablelist>
+		  <varlistentry>
+		    <term><constant>ABI_CLASS_NONE</constant></term>
+		    <listitem><para>no class
+		      </para></listitem></varlistentry>
+		  <varlistentry>
+		    <term><constant>ABI_CLASS_ANSIC</constant></term>
+		    <listitem><para>only requires the ANSI C interfaces
+		      </para></listitem></varlistentry>
+		  <varlistentry>
+		    <term><constant>ABI_CLASS_VIDEODRV</constant></term>
+		    <listitem><para>requires the video driver ABI
+		      </para></listitem></varlistentry>
+		  <varlistentry>
+		    <term><constant>ABI_CLASS_XINPUT</constant></term>
+		    <listitem><para>requires the XInput driver ABI
+		      </para></listitem></varlistentry>
+		  <varlistentry>
+		    <term><constant>ABI_CLASS_EXTENSION</constant></term>
+		    <listitem><para>requires the extension module ABI
+		      </para></listitem></varlistentry>
+		  <varlistentry>
+		    <term><constant>ABI_CLASS_FONT</constant></term>
+		    <listitem><para>requires the font module ABI
+		      </para></listitem></varlistentry>
+		</variablelist>
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>abiversion</structfield></term>
+	    <listitem><para>
+		The version of abiclass that the module requires.  The
+		version consists of major and minor components.  The
+		major version must match and the minor version must be
+		no newer than that provided by the server or parent
+		module.  Version identifiers for the built-in classes
+		currently defined are:
+
+		<literallayout><constant>
+                   ABI_ANSIC_VERSION
+                   ABI_VIDEODRV_VERSION
+                   ABI_XINPUT_VERSION
+                   ABI_EXTENSION_VERSION
+                   ABI_FONT_VERSION
+		  </constant></literallayout>
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>moduleclass</structfield></term>
+	    <listitem><para>
+		This is similar to the abiclass field, except that it
+		defines the type of module rather than the ABI it
+		requires.  For example, although all video drivers require
+		the video driver ABI, not all modules that require the
+		video driver ABI are video drivers.  This distinction
+		can be made with the moduleclass.  Currently pre-defined
+		module classes are:
+
+		<literallayout><constant>
+                   MOD_CLASS_NONE
+                   MOD_CLASS_VIDEODRV
+                   MOD_CLASS_XINPUT
+                   MOD_CLASS_FONT
+                   MOD_CLASS_EXTENSION
+		  </constant></literallayout>
+
+	      </para></listitem></varlistentry>
+
+	  <varlistentry>
+	    <term><structfield>checksum</structfield></term>
+	    <listitem><para>
+		Not currently used.
+	      </para></listitem></varlistentry>
+
+	</variablelist>
+      </para>
+
+      <para>
+The module version information, and the optional <function>SetupProc</function>
+and <function>TearDownProc</function> entry points are found by the loader
+by locating a data object in the module called "modnameModuleData",
+where "modname" is the canonical name of the module.  Modules must
+contain such a data object, and it must be declared with global scope,
+be compile-time initialised, and is of the following type:
+
+	<programlisting>
+typedef struct {
+    XF86ModuleVersionInfo *     vers;
+    ModuleSetupProc             setup;
+    ModuleTearDownProc          teardown;
+} XF86ModuleData;
+	</programlisting>
+      </para>
+
+      <para>
+The vers parameter must be initialised to a pointer to a correctly
+initialised <structname>XF86ModuleVersionInfo</structname> struct.  The other
+two parameter are optional, and should be initialised to
+<constant>NULL</constant> when not required.  The other parameters are defined
+as
+
+	<blockquote><para>
+	    <programlisting>
+    typedef pointer (*ModuleSetupProc)(pointer, pointer, int *, int *);
+
+    typedef void (*ModuleTearDownProc)(pointer);
+
+    pointer SetupProc(pointer module, pointer options,
+                      int *errmaj, int *errmin);
+	    </programlisting>
+	    <blockquote><para>
+    When defined, this function is called by the loader after successfully
+    loading a module.  module is a handle for the newly loaded module,
+    and maybe used by the <function>SetupProc</function> if it calls other
+    loader functions that require a reference to it.   The remaining
+    arguments are those that were passed to the
+    <function>LoadModule()</function> (or <function>LoadSubModule()</function>),
+    and are described above. When the <function>SetupProc</function> is
+    successful it must return a non-<constant>NULL</constant> value.  The
+    loader checks this, and if it is <constant>NULL</constant> it unloads
+    the module and reports the failure to the caller of
+    <function>LoadModule()</function>.  If the <function>SetupProc</function>
+    does things that need to be undone when the module is unloaded,
+    it should define a <function>TearDownProc</function>, and return a
+    pointer that the <function>TearDownProc</function> can use to undo what
+    has been done.
+	      </para>
+
+	      <para>
+    When a module is loaded multiple times, the <function>SetupProc</function>
+    is called once for each time it is loaded.
+	      </para>
+
+	    </blockquote></para></blockquote>
+
+	<blockquote><para>
+	    <programlisting>
+    void TearDownProc(pointer tearDownData);
+	    </programlisting>
+	    <blockquote><para>
+    When defined, this function is called when the loader unloads a
+    module.  The <parameter>tearDownData</parameter> parameter is the return
+    value of the <function>SetupProc()</function> that was called when the
+    module was loaded.  The purpose of this function is to clean up
+    before the module is unloaded (for example, by freeing allocated
+    resources).
+	      </para>
+
+	    </blockquote></para></blockquote>
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Public Loader Interface</title>
+
+      <para>
+The following is the Loader interface that is available to any part of
+the server, and may also be used from within modules.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    pointer LoadSubModule(pointer parent, const char *module,
+                          const char **subdirlist, const char **patternlist,
+                          pointer options, const XF86ModReqInfo * modreq,
+                          int *errmaj, int *errmin);
+	  </programlisting>
+	  <blockquote><para>
+    This function is like the <function>LoadModule()</function> function
+    described above, except that the module loaded is registered as a
+    child of the calling module.  The <parameter>parent</parameter> parameter
+    is the calling module's handle.  Modules loaded with this function
+    are automatically unloaded when the parent module is unloaded.  The
+    other difference is that the path parameter may not be specified.
+    The module search path used for modules loaded with this function
+    is the default search path as initialised with
+    <function>LoaderSetPath()</function>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void UnloadSubModule(pointer module);
+	  </programlisting>
+	  <blockquote><para>
+    This function unloads the module with handle <parameter>module</parameter>.
+    If that module itself has children, they are also unloaded.  It is
+    like <function>UnloadModule()</function>, except that it is safe to use
+    for unloading child modules.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    pointer LoaderSymbol(const char *symbol);
+	  </programlisting>
+	<blockquote><para>
+    This function returns the address of the symbol with name
+    <parameter>symbol</parameter>.  This may be used to locate a module entry
+    point with a known name.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    char **LoaderlistDirs(const char **subdirlist,
+                          const char **patternlist);
+	  </programlisting>
+	  <blockquote><para>
+    This function returns a <constant>NULL</constant> terminated list of
+    canonical modules names for modules found in the default module
+    search path.  The <parameter>subdirlist</parameter> and
+    <parameter>patternlist</parameter> parameters are as described above, and
+    can be used to control the locations and names that are searched.
+    If no modules are found, the return value is <constant>NULL</constant>.
+    The returned list should be freed by calling
+    <function>LoaderFreeDirList()</function> when it is no longer needed.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoaderFreeDirList(char **list);
+	  </programlisting>
+	  <blockquote><para>
+    This function frees a module list created by
+    <function>LoaderlistDirs()</function>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoaderReqSymLists(const char **list0, ...);
+	  </programlisting>
+	  <blockquote><para>
+    This function allows the registration of required symbols with the
+    loader.  It is normally used by a caller of
+    <function>LoadSubModule()</function>.  If any symbols registered in this
+    way are found to be unresolved when
+    <function>LoaderCheckUnresolved()</function> is called then
+    <function>LoaderCheckUnresolved()</function> will report a failure.
+    The function takes one or more <constant>NULL</constant> terminated
+    lists of symbols.  The end of the argument list is indicated by a
+    <constant>NULL</constant> argument.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoaderReqSymbols(const char *sym0, ...);
+	  </programlisting>
+	<blockquote><para>
+    This function is like <function>LoaderReqSymLists()</function> except
+    that its arguments are symbols rather than lists of symbols.  This
+    function is more convenient when single functions are to be registered,
+    especially when the single function might depend on runtime factors.
+    The end of the argument list is indicated by a <constant>NULL</constant>
+    argument.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoaderRefSymLists(const char **list0, ...);
+	  </programlisting>
+	  <blockquote><para>
+    This function allows the registration of possibly unresolved symbols
+    with the loader.  When <function>LoaderCheckUnresolved()</function> is
+    run it won't generate warnings for symbols registered in this way
+    unless they were also registered as required symbols.
+    The function takes one or more <constant>NULL</constant> terminated
+    lists of symbols.  The end of the argument list is indicated by a
+    <constant>NULL</constant> argument.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoaderRefSymbols(const char *sym0, ...);
+	  </programlisting>
+	  <blockquote><para>
+    This function is like <function>LoaderRefSymLists()</function> except
+    that its arguments are symbols rather than lists of symbols.  This
+    function is more convenient when single functions are to be registered,
+    especially when the single function might depend on runtime factors.
+    The end of the argument list is indicated by a <constant>NULL</constant>
+    argument.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    int LoaderCheckUnresolved(int delayflag);
+	  </programlisting>
+	  <blockquote><para>
+    This function checks for unresolved symbols.  It generates warnings
+    for unresolved symbols that have not been registered with
+    <function>LoaderRefSymLists()</function>, and maps them to a dummy
+    function.  This behaviour may change in future.  If unresolved
+    symbols are found that have been registered with
+    <function>LoaderReqSymLists()</function> or
+    <function>LoaderReqSymbols()</function> then this function returns a
+    non-zero value.  If none of these symbols are unresolved the return
+    value is zero, indicating success.
+	    </para>
+
+	    <para>
+    The <parameter>delayflag</parameter> parameter should normally be set to
+    <constant>LD_RESOLV_IFDONE</constant>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    LoaderErrorMsg(const char *name, const char *modname,
+                   int errmaj, int errmin);
+	  </programlisting>
+	  <blockquote><para>
+    This function prints an error message that includes the text <quote>Failed
+    to load module</quote>, the module name <parameter>modname</parameter>, a message
+    specific to the <parameter>errmaj</parameter> value, and the value if
+    <parameter>errmin</parameter>.  If <parameter>name</parameter> is
+    non-<constant>NULL</constant>, it is printed as an identifying prefix
+    to the message (followed by a <quote>:</quote>).
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Special Registration Functions</title>
+
+      <para>
+The loader contains some functions for registering some classes of modules.
+These may be moved out of the loader at some point.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoadExtension(ExtensionModule *ext);
+	  </programlisting>
+	  <blockquote><para>
+    This registers the entry points for the extension identified by
+    <parameter>ext</parameter>.  The <structname>ExtensionModule</structname> struct is
+    defined as:
+
+	      <programlisting>
+typedef struct {
+    InitExtension       initFunc;
+    char *              name;
+    Bool                *disablePtr;
+    InitExtension       setupFunc;
+} ExtensionModule;
+	      </programlisting>
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void LoadFont(FontModule *font);
+	  </programlisting>
+	  <blockquote><para>
+    This registers the entry points for the font rasteriser module
+    identified by <parameter>font</parameter>.  The <structname>FontModule</structname>
+    struct is defined as:
+
+	      <programlisting>
+ typedef struct {
+    InitFont    initFunc;
+    char *      name;
+    pointer     module;
+} FontModule;
+	      </programlisting>
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+    </sect2>
+
+  </sect1>
+
+  <sect1>
+    <title>Helper Functions</title>
+
+    <para>
+This section describe <quote>helper</quote> functions that video driver
+might find useful.  While video drivers are not required to use any of
+these to be considered <quote>compliant</quote>, the use of appropriate helpers is
+strongly encouraged to improve the consistency of driver behaviour.
+    </para>
+
+    <sect2>
+      <title>Functions for printing messages</title>
+
+      <blockquote><para>
+	  <programlisting>
+    ErrorF(const char *format, ...);
+	  </programlisting>
+	  <blockquote><para>
+      This is the basic function for writing to the error log (typically
+      stderr and/or a log file).  Video drivers should usually avoid
+      using this directly in favour of the more specialised functions
+      described below.  This function is useful for printing messages
+      while debugging a driver.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    FatalError(const char *format, ...);
+	  </programlisting>
+	  <blockquote><para>
+      This prints a message and causes the Xserver to abort.  It should
+      rarely be used within a video driver, as most error conditions
+      should be flagged by the return values of the driver functions.
+      This allows the higher layers to decide how to proceed.  In rare
+      cases, this can be used within a driver if a fatal unexpected
+      condition is found.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    xf86ErrorF(const char *format, ...);
+	  </programlisting>
+	  <blockquote><para>
+      This is like <function>ErrorF()</function>, except that the message is
+      only printed when the Xserver's verbosity level is set to the
+      default (<constant>1</constant>) or higher.  It means that the messages
+      are not printed when the server is started with the
+      <option>-quiet</option> flag.  Typically this function would only be
+      used for continuing messages started with one of the more specialised
+      functions described below.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    xf86ErrorFVerb(int verb, const char *format, ...);
+	  </programlisting>
+	  <blockquote><para>
+      Like <function>xf86ErrorF()</function>, except the minimum verbosity
+      level for which the message is to be printed is given explicitly.
+      Passing a <parameter>verb</parameter> value of zero means the message
+      is always printed.  A value higher than <constant>1</constant> can be
+      used for information would normally not be needed, but which might
+      be useful when diagnosing problems.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+
+      <blockquote><para>
+	  <programlisting>
+    xf86Msg(MessageType type, const char *format, ...);
+	  </programlisting>
+	  <blockquote><para>
+      This is like <function>xf86ErrorF()</function>, except that the message
+      is prefixed with a marker determined by the value of
+      <parameter>type</parameter>.  The marker is used to indicate the type of
+      message (warning, error, probed value, config value, etc).  Note
+      the <varname>xf86Verbose</varname> value is ignored for messages of
+      type <constant>X_ERROR</constant>.
+	    </para>
+
+	    <para>
+      The marker values are:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><constant>X_PROBED</constant></term>
+		  <listitem><para>Value was probed.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_CONFIG</constant></term>
+		  <listitem><para>Value was given in the config file.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_DEFAULT</constant></term>
+		  <listitem><para>Value is a default.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_CMDLINE</constant></term>
+		  <listitem><para>Value was given on the command line.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_NOTICE</constant></term>
+		  <listitem><para>Notice.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_ERROR</constant></term>
+		  <listitem><para>Error message.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_WARNING</constant></term>
+		  <listitem><para>Warning message.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_INFO</constant></term>
+		  <listitem><para>Informational message.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_NONE</constant></term>
+		  <listitem><para>No prefix.
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>X_NOT_IMPLEMENTED</constant></term>
+		  <listitem><para>The message relates to functionality
+		      that is not yetimplemented.
+		    </para></listitem></varlistentry>
+		</variablelist>
+
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    xf86MsgVerb(MessageType type, int verb, const char *format, ...);
+	  </programlisting>
+	  <blockquote><para>
+      Like <function>xf86Msg()</function>, but with the verbosity level given
+      explicitly.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    xf86DrvMsg(int scrnIndex, MessageType type, const char *format, ...);
+	  </programlisting>
+	  <blockquote><para>
+      This is like <function>xf86Msg()</function> except that the driver's
+      name (the <structfield>name</structfield> field of the
+      <structname>ScrnInfoRec</structname>) followed by the
+      <parameter>scrnIndex</parameter> in parentheses is printed following the
+      prefix.  This should be used by video drivers in most cases as it
+      clearly indicates which driver/screen the message is for.  If
+      <parameter>scrnIndex</parameter> is negative, this function behaves
+      exactly like <function>xf86Msg()</function>.
+	    </para>
+
+	    <para>
+      NOTE: This function can only be used after the
+      <structname>ScrnInfoRec</structname> and its <structfield>name</structfield> field
+      have been allocated.  Normally, this means that it can not be
+      used before the END of the <function>ChipProbe()</function> function.
+      Prior to that, use <function>xf86Msg()</function>, providing the
+      driver's name explicitly.  No screen number can be supplied at
+      that point.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    xf86DrvMsgVerb(int scrnIndex, MessageType type, int verb,
+                                const char *format, ...);
+	  </programlisting>
+	  <blockquote><para>
+      Like <function>xf86DrvMsg()</function>, but with the verbosity level
+      given explicitly.
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </sect2>
+
+
+    <sect2>
+      <title>Functions for setting values based on command line and config file</title>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86SetDepthBpp(ScrnInfoPtr scrp, int depth, int bpp,
+
+                                int fbbpp, int depth24flags);
+	  </programlisting>
+	  <blockquote><para>
+      This function sets the <structfield>depth</structfield>, <structfield>pixmapBPP</structfield> and <structfield>bitsPerPixel</structfield> fields
+      of the <structname>ScrnInfoRec</structname>.  It also determines the defaults for display-wide
+      attributes and pixmap formats the screen will support, and finds
+      the Display subsection that matches the depth/bpp.  This function
+      should normally be called very early from the
+      <function>ChipPreInit()</function> function.
+	    </para>
+
+	    <para>
+      It requires that the <structfield>confScreen</structfield> field of the <structname>ScrnInfoRec</structname> be
+      initialised prior to calling it.  This is done by the XFree86
+      common layer prior to calling <function>ChipPreInit()</function>.
+	    </para>
+
+	    <para>
+      The parameters passed are:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><parameter>depth</parameter></term>
+		  <listitem><para>
+		driver's preferred default depth if no other is given.
+                If zero, use the overall server default.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>bpp</parameter></term>
+		  <listitem><para>
+		Same, but for the pixmap bpp.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>fbbpp</parameter></term>
+		  <listitem><para>
+		Same, but for the framebuffer bpp.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>depth24flags</parameter></term>
+		  <listitem><para>
+		Flags that indicate the level of 24/32bpp support
+                and whether conversion between different framebuffer
+                and pixmap formats is supported.  The flags for this
+                argument are defined as follows, and multiple flags
+                may be ORed together:
+
+		      <variablelist>
+			<varlistentry>
+			  <term><constant>NoDepth24Support</constant></term>
+			  <listitem><para>No depth 24 formats supported
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>Support24bppFb</constant></term>
+			  <listitem><para>24bpp framebuffer supported
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>Support32bppFb</constant></term>
+			  <listitem><para>32bpp framebuffer supported
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>SupportConvert24to32</constant></term>
+			  <listitem><para>Can convert 24bpp pixmap to 32bpp fb
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>SupportConvert32to24</constant></term>
+			  <listitem><para>Can convert 32bpp pixmap to 24bpp fb
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>ForceConvert24to32</constant></term>
+			  <listitem><para>Force 24bpp pixmap to 32bpp fb conversion
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>ForceConvert32to24</constant></term>
+			  <listitem><para>Force 32bpp pixmap to 24bpp fb conversion
+			    </para></listitem></varlistentry>
+		      </variablelist>
+		    </para></listitem></varlistentry>
+
+	      </variablelist>
+	    </para>
+
+	    <para>
+      It uses the command line, config file, and default values in the
+      correct order of precedence to determine the depth and bpp values.
+      It is up to the driver to check the results to see that it supports
+      them.  If not the <function>ChipPreInit()</function> function should
+      return <constant>FALSE</constant>.
+	    </para>
+
+	    <para>
+      If only one of depth/bpp is given, the other is set to a reasonable
+      (and consistent) default.
+	    </para>
+
+	    <para>
+      If a driver finds that the initial <parameter>depth24flags</parameter>
+      it uses later results in a fb format that requires more video
+      memory than is available it may call this function a second time
+      with a different <parameter>depth24flags</parameter> setting.
+	    </para>
+
+	    <para>
+      On success, the return value is <constant>TRUE</constant>.  On failure
+      it prints an error message and returns <constant>FALSE</constant>.
+	    </para>
+
+	    <para>
+      The following fields of the <structname>ScrnInfoRec</structname> are
+      initialised by this function:
+
+	      <blockquote><para>
+<structfield>depth</structfield>, <structfield>bitsPerPixel</structfield>,
+<structfield>display</structfield>, <structfield>imageByteOrder</structfield>,
+<structfield>bitmapScanlinePad</structfield>,
+<structfield>bitmapScanlineUnit</structfield>, <structfield>bitmapBitOrder</structfield>,
+<structfield>numFormats</structfield>, <structfield>formats</structfield>,
+<structfield>fbFormat</structfield>.
+		</para></blockquote>
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86PrintDepthBpp(scrnInfoPtr scrp);
+	  </programlisting>
+	  <blockquote><para>
+      This function can be used to print out the depth and bpp settings.
+      It should be called after the final call to
+      <function>xf86SetDepthBpp()</function>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86SetWeight(ScrnInfoPtr scrp, rgb weight, rgb mask);
+	  </programlisting>
+	  <blockquote><para>
+      This function sets the <structfield>weight</structfield>, <structfield>mask</structfield>,
+      <structfield>offset</structfield> and <structfield>rgbBits</structfield> fields of the
+      <structname>ScrnInfoRec</structname>.  It would normally be called fairly
+      early in the <function>ChipPreInit()</function> function for
+      depths&nbsp;&gt;&nbsp;8bpp.
+	    </para>
+
+	    <para>
+      It requires that the <structfield>depth</structfield> and
+      <structfield>display</structfield> fields of the <structname>ScrnInfoRec</structname>
+      be initialised prior to calling it.
+	    </para>
+
+	    <para>
+      The parameters passed are:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><parameter>weight</parameter></term>
+		  <listitem><para>
+		driver's preferred default weight if no other is given.
+                If zero, use the overall server default.
+
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>mask</parameter></term>
+		  <listitem><para>
+		Same, but for mask.
+
+		    </para></listitem></varlistentry>
+	      </variablelist>
+	    </para>
+
+	    <para>
+      It uses the command line, config file, and default values in the
+      correct order of precedence to determine the weight value.  It
+      derives the mask and offset values from the weight and the defaults.
+      It is up to the driver to check the results to see that it supports
+      them.  If not the <function>ChipPreInit()</function> function should
+      return <constant>FALSE</constant>.
+	    </para>
+
+	    <para>
+      On success, this function prints a message showing the weight
+      values selected, and returns <constant>TRUE</constant>.
+	    </para>
+
+	    <para>
+      On failure it prints an error message and returns <constant>FALSE</constant>.
+	    </para>
+
+	    <para>
+      The following fields of the <structname>ScrnInfoRec</structname> are
+      initialised by this function:
+
+	      <blockquote><para>
+		  <structfield>weight</structfield>,
+		  <structfield>mask</structfield>,
+		  <structfield>offset</structfield>.
+		</para></blockquote>
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86SetDefaultVisual(ScrnInfoPtr scrp, int visual);
+	  </programlisting>
+	  <blockquote><para>
+      This function sets the <structfield>defaultVisual</structfield> field of the
+      <structname>ScrnInfoRec</structname>.  It would normally be called fairly
+      early from the <function>ChipPreInit()</function> function.
+	    </para>
+
+	    <para>
+      It requires that the <structfield>depth</structfield> and
+      <structfield>display</structfield> fields of the <structname>ScrnInfoRec</structname>
+      be initialised prior to calling it.
+	    </para>
+
+	    <para>
+      The parameters passed are:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><parameter>visual</parameter></term>
+		  <listitem><para>
+		driver's preferred default visual if no other is given.
+		If <constant>-1</constant>, use the overall server default.
+		    </para></listitem></varlistentry>
+
+	      </variablelist>
+	    </para>
+
+	    <para>
+      It uses the command line, config file, and default values in the
+      correct order of precedence to determine the default visual value.
+      It is up to the driver to check the result to see that it supports
+      it.  If not the <function>ChipPreInit()</function> function should
+      return <constant>FALSE</constant>.
+	    </para>
+
+	    <para>
+      On success, this function prints a message showing the default visual
+      selected, and returns <constant>TRUE</constant>.
+	    </para>
+
+	    <para>
+      On failure it prints an error message and returns <constant>FALSE</constant>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86SetGamma(ScrnInfoPtr scrp, Gamma gamma);
+	  </programlisting>
+	  <blockquote><para>
+      This function sets the <structfield>gamma</structfield> field of the
+      <structname>ScrnInfoRec</structname>.  It would normally be called fairly
+      early from the <function>ChipPreInit()</function> function in cases
+      where the driver supports gamma correction.
+	    </para>
+
+	    <para>
+      It requires that the <structfield>monitor</structfield> field of the
+      <structname>ScrnInfoRec</structname> be initialised prior to calling it.
+	    </para>
+
+	    <para>
+      The parameters passed are:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><parameter>gamma</parameter></term>
+		  <listitem><para>
+		driver's preferred default gamma if no other is given.
+		If zero (<code>&lt; 0.01</code>), use the overall server
+		default.
+		    </para></listitem></varlistentry>
+
+	      </variablelist>
+	    </para>
+
+	    <para>
+      It uses the command line, config file, and default values in the
+      correct order of precedence to determine the gamma value.  It is
+      up to the driver to check the results to see that it supports
+      them.  If not the <function>ChipPreInit()</function> function should
+      return <constant>FALSE</constant>.
+	    </para>
+
+	    <para>
+      On success, this function prints a message showing the gamma
+      value selected, and returns <constant>TRUE</constant>.
+	    </para>
+
+	    <para>
+      On failure it prints an error message and returns <constant>FALSE</constant>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86SetDpi(ScrnInfoPtr pScrn, int x, int y);
+	  </programlisting>
+	  <blockquote><para>
+      This function sets the <structfield>xDpi</structfield> and <structfield>yDpi</structfield>
+      fields of the <structname>ScrnInfoRec</structname>.  The driver can specify
+      preferred defaults by setting <parameter>x</parameter> and <parameter>y</parameter>
+      to non-zero values.  The <option>-dpi</option> command line option
+      overrides all other settings.  Otherwise, if the
+      <emphasis>DisplaySize</emphasis> entry is present in the screen's &k.monitor;
+      config file section, it is used together with the virtual size to
+      calculate the dpi values.  This function should be called after
+      all the mode resolution has been done.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86SetBlackWhitePixels(ScrnInfoPtr pScrn);
+	  </programlisting>
+	  <blockquote><para>
+      This functions sets the <structfield>blackPixel</structfield> and
+      <structfield>whitePixel</structfield> fields of the <structname>ScrnInfoRec</structname>
+      according to whether or not the <option>-flipPixels</option> command
+      line options is present.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    const char *xf86GetVisualName(int visual);
+	  </programlisting>
+	  <blockquote><para>
+      Returns a printable string with the visual name matching the
+      numerical visual class provided.  If the value is outside the
+      range of valid visual classes, <constant>NULL</constant> is returned.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+    </sect2>
+
+    <sect2>
+      <title>Primary Mode functions</title>
+
+      <para>
+The primary mode helper functions are those which would normally be
+used by a driver, unless it has unusual requirements which cannot
+be catered for the by the helpers.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    int xf86ValidateModes(ScrnInfoPtr scrp, DisplayModePtr availModes,
+                          char **modeNames, ClockRangePtr clockRanges,
+                          int *linePitches, int minPitch, int maxPitch,
+                          int pitchInc, int minHeight, int maxHeight,
+                          int virtualX, int virtualY,
+                          unsigned long apertureSize,
+                          LookupModeFlags strategy);
+	  </programlisting>
+	  <blockquote><para>
+      This function basically selects the set of modes to use based on
+      those available and the various constraints.  It also sets some
+      other related parameters.  It is normally called near the end of
+      the <function>ChipPreInit()</function> function.
+	    </para>
+
+	    <para>
+      The parameters passed to the function are:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><parameter>availModes</parameter></term>
+		  <listitem><para>
+		List of modes available for the monitor.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>modeNames</parameter></term>
+		  <listitem><para>
+		List of mode names that the screen is requesting.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>clockRanges</parameter></term>
+		  <listitem><para>
+		A list of clock ranges allowed by the driver.  Each
+		range includes whether interlaced or multiscan modes
+		are supported for that range.  See below for more on
+		<parameter>clockRanges</parameter>.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>linePitches</parameter></term>
+		  <listitem><para>
+		List of line pitches supported by the driver.
+		This is optional and should be <constant>NULL</constant> when
+		not used.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>minPitch</parameter></term>
+		  <listitem><para>
+		Minimum line pitch supported by the driver.  This must
+		be supplied when <parameter>linePitches</parameter> is
+		<constant>NULL</constant>, and is ignored otherwise.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>maxPitch</parameter></term>
+		  <listitem><para>
+		Maximum line pitch supported by the driver.  This is
+		required when <parameter>minPitch</parameter> is required.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>pitchInc</parameter></term>
+		  <listitem><para>
+		Granularity of horizontal pitch values as supported by
+		the chipset.  This is expressed in bits.  This must be
+		supplied.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>minHeight</parameter></term>
+		  <listitem><para>
+		minimum virtual height allowed.  If zero, no limit is
+		imposed.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>maxHeight</parameter></term>
+		  <listitem><para>
+		maximum virtual height allowed.  If zero, no limit is
+		imposed.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>virtualX</parameter></term>
+		  <listitem><para>
+		If greater than zero, this is the virtual width value
+		that will be used.  Otherwise, the virtual width is
+		chosen to be the smallest that can accommodate the modes
+		selected.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>virtualY</parameter></term>
+		  <listitem><para>
+		If greater than zero, this is the virtual height value
+		that will be used.  Otherwise, the virtual height is
+		chosen to be the smallest that can accommodate the modes
+		selected.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>apertureSize</parameter></term>
+		  <listitem><para>
+		The size (in bytes) of the aperture used to access video
+		memory.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><parameter>strategy</parameter></term>
+		  <listitem><para>
+		The strategy to use when choosing from multiple modes
+		with the same name.  The options are:
+
+		      <variablelist>
+			<varlistentry>
+			  <term><constant>LOOKUP_DEFAULT</constant></term>
+			  <listitem><para>???
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>LOOKUP_BEST_REFRESH</constant></term>
+			  <listitem><para>mode with best refresh rate
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>LOOKUP_CLOSEST_CLOCK</constant></term>
+			  <listitem><para>mode with closest matching clock
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>LOOKUP_LIST_ORDER</constant></term>
+			  <listitem><para>first usable mode in list
+			    </para></listitem></varlistentry>
+		      </variablelist>
+
+		The following options can also be combined (OR'ed) with
+		one of the above:
+
+		      <variablelist>
+			<varlistentry>
+			  <term><constant>LOOKUP_CLKDIV2</constant></term>
+			  <listitem><para>Allow halved clocks
+			    </para></listitem></varlistentry>
+			<varlistentry>
+			  <term><constant>LOOKUP_OPTIONAL_TOLERANCES</constant></term>
+			  <listitem><para>
+		      Allow missing horizontal sync and/or vertical refresh
+		      ranges in the xorg.conf Monitor section
+			    </para></listitem></varlistentry>
+		      </variablelist>
+
+		<constant>LOOKUP_OPTIONAL_TOLERANCES</constant> should only be
+		specified when the driver can ensure all modes it generates
+		can sync on, or at least not damage, the monitor or digital
+		flat panel.  Horizontal sync and/or vertical refresh ranges
+		specified by the user will still be honoured (and acted upon).
+
+		    </para></listitem></varlistentry>
+	      </variablelist>
+	    </para>
+
+	    <para>
+      This function requires that the following fields of the
+      <structname>ScrnInfoRec</structname> are initialised prior to calling it:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><structfield>clock[]</structfield></term>
+		  <listitem><para>
+		      List of discrete clocks (when non-programmable)
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>numClocks</structfield></term>
+		  <listitem><para>
+		      Number of discrete clocks (when non-programmable)
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>progClock</structfield></term>
+		  <listitem><para>
+		      Whether the clock is programmable or not
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>monitor</structfield></term>
+		  <listitem><para>
+		      Pointer to the applicable xorg.conf monitor section
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>fdFormat</structfield></term>
+		  <listitem><para>
+		      Format of the screen buffer
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>videoRam</structfield></term>
+		  <listitem><para>
+		      total video memory size (in bytes)
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>maxHValue</structfield></term>
+		  <listitem><para>
+		      Maximum horizontal timing value allowed
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>maxVValue</structfield></term>
+		  <listitem><para>
+		      Maximum vertical timing value allowed
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>xInc</structfield></term>
+		  <listitem><para>
+		      Horizontal timing increment in pixels (defaults to 8)
+		    </para></listitem></varlistentry>
+	      </variablelist>
+	    </para>
+
+	    <para>
+      This function fills in the following <structname>ScrnInfoRec</structname>
+      fields:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><structfield>modePool</structfield></term>
+		  <listitem><para>
+		A subset of the modes available to the monitor which
+                are compatible with the driver.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>modes</structfield></term>
+		  <listitem><para>
+		One mode entry for each of the requested modes, with
+                the status field of each filled in to indicate if
+                the mode has been accepted or not.  This list of
+                modes is a circular list.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>virtualX</structfield></term>
+		  <listitem><para>
+		The resulting virtual width.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>virtualY</structfield></term>
+		  <listitem><para>
+		The resulting virtual height.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>displayWidth</structfield></term>
+		  <listitem><para>
+		The resulting line pitch.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>virtualFrom</structfield></term>
+		  <listitem><para>
+		Where the virtual size was determined from.
+		    </para></listitem></varlistentry>
+
+	      </variablelist>
+	    </para>
+
+	    <para>
+      The first stage of this function checks that the
+      <parameter>virtualX</parameter> and <parameter>virtualY</parameter> values
+      supplied (if greater than zero) are consistent with the line pitch
+      and <parameter>maxHeight</parameter> limitations.  If not, an error
+      message is printed, and the return value is <constant>-1</constant>.
+	    </para>
+
+	    <para>
+      The second stage sets up the mode pool, eliminating immediately
+      any modes that exceed the driver's line pitch limits, and also
+      the virtual width and height limits (if greater than zero).  For
+      each mode removed an informational message is printed at verbosity
+      level <constant>2</constant>.  If the mode pool ends up being empty,
+      a warning message is printed, and the return value is
+      <constant>0</constant>.
+	    </para>
+
+	    <para>
+      The final stage is to lookup each mode name, and fill in the remaining
+      parameters.  If an error condition is encountered, a message is
+      printed, and the return value is <constant>-1</constant>.  Otherwise,
+      the return value is the number of valid modes found
+      (<constant>0</constant> if none are found).
+	    </para>
+
+	    <para>
+      Even if the supplied mode names include duplicates, no two names will
+      ever match the same mode.  Furthermore, if the supplied mode names do not
+      yield a valid mode (including the case where no names are passed at all),
+      the function will continue looking through the mode pool until it finds
+      a mode that survives all checks, or until the mode pool is exhausted.
+	    </para>
+
+	    <para>
+      A message is only printed by this function when a fundamental
+      problem is found.  It is intended that this function may be called
+      more than once if there is more than one set of constraints that
+      the driver can work within.
+	    </para>
+
+	    <para>
+      If this function returns <constant>-1</constant>, the
+      <function>ChipPreInit()</function> function should return
+      <constant>FALSE</constant>.
+	    </para>
+
+	    <para>
+      <parameter>clockRanges</parameter> is a linked list of clock ranges
+      allowed by the driver.  If a mode doesn't fit in any of the defined
+      <parameter>clockRanges</parameter>, it is rejected.  The first
+      <literal remap="tt">clockRange</literal> that matches all requirements is used.
+      This structure needs to be initialized to NULL when allocated.
+	    </para>
+
+	    <para>
+      <parameter>clockRanges</parameter> contains the following fields:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><structfield>minClock</structfield></term>
+		  <term><structfield>maxClock</structfield></term>
+		  <listitem><para>
+		The lower and upper mode clock bounds for which the rest
+		of the <structname>clockRange</structname> parameters apply.
+		Since these are the mode clocks, they are not scaled
+		with the <structfield>ClockMulFactor</structfield> and
+		<structfield>ClockDivFactor</structfield>.  It is up to the driver
+		to adjust these values if they depend on the clock
+		scaling factors.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>clockIndex</structfield></term>
+		  <listitem><para>
+		(not used yet) <constant>-1</constant> for programmable clocks
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>interlaceAllowed</structfield></term>
+		  <listitem><para>
+		<constant>TRUE</constant> if interlacing is allowed for this
+		range
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>doubleScanAllowed</structfield></term>
+		  <listitem><para>
+		<constant>TRUE</constant> if doublescan or multiscan is allowed
+		for this range
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>ClockMulFactor</structfield></term>
+		  <term><structfield>ClockDivFactor</structfield></term>
+		  <listitem><para>
+		Scaling factors that are applied to the mode clocks ONLY
+		before selecting a clock index (when there is no
+		programmable clock) or a <structfield>SynthClock</structfield>
+		value.  This is useful for drivers that support pixel
+		multiplexing or that need to scale the clocks because
+		of hardware restrictions (like sending 24bpp data to an
+		8 bit RAMDAC using a tripled clock).
+		    </para>
+
+		    <para>
+		Note that these parameters describe what must be done
+		to the mode clock to achieve the data transport clock
+		between graphics controller and RAMDAC.  For example
+		for <literal remap="tt">2:1</literal> pixel multiplexing, two pixels
+		are sent to the RAMDAC on each clock.  This allows the
+		RAMDAC clock to be half of the actual pixel clock.
+		Hence, <code>ClockMulFactor=1</code> and
+		<code>ClockDivFactor=2</code>.  This means that the
+		clock used for clock selection (ie, determining the
+		correct clock index from the list of discrete clocks)
+		or for the <structfield>SynthClock</structfield> field in case of
+		a programmable clock is:  (<code>mode-&gt;Clock *
+		ClockMulFactor) / ClockDivFactor</code>.
+		    </para></listitem></varlistentry>
+
+		<varlistentry>
+		  <term><structfield>PrivFlags</structfield></term>
+		  <listitem><para>
+		This field is copied into the
+		<literal remap="tt">mode-&gt;PrivFlags</literal> field when this
+		<literal remap="tt">clockRange</literal> is selected by
+		<function>xf86ValidateModes()</function>.  It allows the
+		driver to find out what clock range was selected, so it
+		knows it needs to set up pixel multiplexing or any other
+		range-dependent feature.  This field is purely
+		driver-defined: it may contain flag bits, an index or
+		anything else (as long as it is an <literal remap="tt">INT</literal>).
+		    </para></listitem></varlistentry>
+	      </variablelist>
+	    </para>
+
+	    <para>
+      Note that the <structfield>mode-&gt;SynthClock</structfield> field is always
+      filled in by <function>xf86ValidateModes()</function>: it will contain
+      the <quote>data transport clock</quote>, which is the clock that will have
+      to be programmed in the chip when it has a programmable clock, or
+      the clock that will be picked from the clocks list when it is not
+      a programmable one.  Thus:
+
+	      <programlisting>
+    mode-&gt;SynthClock = (mode-&gt;Clock * ClockMulFactor) / ClockDivFactor
+	      </programlisting>
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86PruneDriverModes(ScrnInfoPtr scrp);
+	  </programlisting>
+	  <blockquote><para>
+      This function deletes modes in the modes field of the
+      <structname>ScrnInfoRec</structname> that have been marked as invalid.
+      This is normally run after having run
+      <function>xf86ValidateModes()</function> for the last time.  For each
+      mode that is deleted, a warning message is printed out indicating
+      the reason for it being deleted.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86SetCrtcForModes(ScrnInfoPtr scrp, int adjustFlags);
+	  </programlisting>
+	  <blockquote><para>
+      This function fills in the <structname>Crtc*</structname> fields for all
+      the modes in the <structfield>modes</structfield> field of the
+      <structname>ScrnInfoRec</structname>.  The <parameter>adjustFlags</parameter>
+      parameter determines how the vertical CRTC values are scaled for
+      interlaced modes.  They are halved if it is
+      <constant>INTERLACE_HALVE_V</constant>.  The vertical CRTC values are
+      doubled for doublescan modes, and are further multiplied by the
+      <literal remap="tt">VScan</literal> value.
+	    </para>
+
+	    <para>
+      This function is normally called after calling
+      <function>xf86PruneDriverModes()</function>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86PrintModes(ScrnInfoPtr scrp);
+	  </programlisting>
+	  <blockquote><para>
+      This function prints out the virtual size setting, and the line
+      pitch being used.  It also prints out two lines for each mode being
+      used.  The first line includes the mode's pixel clock, horizontal sync
+      rate, refresh rate, and whether it is interlaced, doublescanned and/or
+      multi-scanned.  The second line is the mode's Modeline.
+	    </para>
+
+	    <para>
+      This function is normally called after calling
+      <function>xf86SetCrtcForModes()</function>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+    </sect2>
+
+    <sect2>
+      <title>Secondary Mode functions</title>
+
+      <para>
+The secondary mode helper functions are functions which are normally
+used by the primary mode helper functions, and which are not normally
+called directly by a driver.  If a driver has unusual requirements
+and needs to do its own mode validation, it might be able to make
+use of some of these secondary mode helper functions.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    int xf86GetNearestClock(ScrnInfoPtr scrp, int freq, Bool allowDiv2,
+                            int *divider);
+	  </programlisting>
+	  <blockquote><para>
+      This function returns the index of the closest clock to the
+      frequency <parameter>freq</parameter> given (in kHz).  It assumes that
+      the number of clocks is greater than zero.  It requires that the
+      <structfield>numClocks</structfield> and <structfield>clock</structfield> fields of the
+      <structname>ScrnInfoRec</structname> are initialised.  The
+      <structfield>allowDiv2</structfield> field determines if the clocks can be
+      halved.  The <parameter>*divider</parameter> return value indicates
+      whether clock division is used when determining the clock returned.
+	    </para>
+
+	    <para>
+      This function is only for non-programmable clocks.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    const char *xf86ModeStatusToString(ModeStatus status);
+	  </programlisting>
+	  <blockquote><para>
+      This function converts the <parameter>status</parameter> value to a
+      descriptive printable string.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    ModeStatus xf86LookupMode(ScrnInfoPtr scrp, DisplayModePtr modep,
+                     ClockRangePtr clockRanges, LookupModeFlags strategy);
+	  </programlisting>
+	  <blockquote><para>
+      This function takes a pointer to a mode with the name filled in,
+      and looks for a mode in the <structfield>modePool</structfield> list which
+      matches.  The parameters of the matching mode are filled in to
+      <parameter>*modep</parameter>.  The <parameter>clockRanges</parameter> and
+      <parameter>strategy</parameter> parameters are as for the
+      <function>xf86ValidateModes()</function> function above.
+	    </para>
+
+	    <para>
+      This function requires the <structfield>modePool</structfield>,
+      <structfield>clock[]</structfield>, <structfield>numClocks</structfield> and
+      <structfield>progClock</structfield> fields of the <structname>ScrnInfoRec</structname>
+      to be initialised before being called.
+	    </para>
+
+	    <para>
+      The return value is <constant>MODE_OK</constant> if a mode was found.
+      Otherwise it indicates why a matching mode could not be found.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    ModeStatus xf86InitialCheckModeForDriver(ScrnInfoPtr scrp,
+                                DisplayModePtr mode, ClockRangePtr clockRanges,
+                                LookupModeFlags strategy, int maxPitch,
+                                int virtualX, int virtualY);
+	  </programlisting>
+	  <blockquote><para>
+      This function checks the passed mode against some basic driver
+      constraints.  Apart from the ones passed explicitly, the
+      <structfield>maxHValue</structfield> and <structfield>maxVValue</structfield> fields of
+      the <structname>ScrnInfoRec</structname> are also used.  If the
+      <structfield>ValidMode</structfield> field of the <structname>ScrnInfoRec</structname>
+      is set, that function is also called to check the mode.  Next, the
+      mode is checked against the monitor's constraints.
+	    </para>
+
+	    <para>
+      If the mode is consistent with all constraints, the return value
+      is <constant>MODE_OK</constant>.  Otherwise the return value indicates
+      which constraint wasn't met.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86DeleteMode(DisplayModePtr *modeList, DisplayModePtr mode);
+	  </programlisting>
+	  <blockquote><para>
+      This function deletes the <parameter>mode</parameter> given from the
+      <parameter>modeList</parameter>.  It never prints any messages, so it is
+      up to the caller to print a message if required.
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Functions for handling strings and tokens</title>
+
+      <para>
+    Tables associating strings and numerical tokens combined with the
+    following functions provide a compact way of handling strings from
+    the config file, and for converting tokens into printable strings.
+    The table data structure is:
+
+	<programlisting>
+typedef struct {
+    int                 token;
+    const char *        name;
+} SymTabRec, *SymTabPtr;
+	</programlisting>
+      </para>
+
+      <para>
+    A table is an initialised array of <structname>SymTabRec</structname>.  The
+    tokens must be non-negative integers.  Multiple names may be mapped
+    to a single token.  The table is terminated with an element with a
+    <structfield>token</structfield> value of <constant>-1</constant> and
+    <constant>NULL</constant> for the <structfield>name</structfield>.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    const char *xf86TokenToString(SymTabPtr table, int token);
+	  </programlisting>
+	  <blockquote><para>
+      This function returns the first string in <parameter>table</parameter>
+      that matches <parameter>token</parameter>.  If no match is found,
+      <constant>NULL</constant> is returned (NOTE, older versions of this
+      function would return the string "unknown" when no match is found).
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    int xf86StringToToken(SymTabPtr table, const char *string);
+	  </programlisting>
+	  <blockquote><para>
+      This function returns the first token in <parameter>table</parameter>
+      that matches <parameter>string</parameter>.  The
+      <function>xf86NameCmp()</function> function is used to determine the
+      match.  If no match is found, <constant>-1</constant> is returned.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+    </sect2>
+
+    <sect2>
+      <title>Functions for finding which config file entries to use</title>
+
+      <para>
+    These functions can be used to select the appropriate config file
+    entries that match the detected hardware.  They are described above
+    in the <link linkend="probe">Probe</link> and
+    <link linkend="avail">Available Functions</link> sections.
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Probing discrete clocks on old hardware</title>
+
+      <para>
+    The <function>xf86GetClocks()</function> function may be used to assist
+    in finding the discrete pixel clock values on older hardware.
+      </para>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86GetClocks(ScrnInfoPtr pScrn, int num,
+                       Bool (*ClockFunc)(ScrnInfoPtr, int),
+                       void (*ProtectRegs)(ScrnInfoPtr, Bool),
+                       void (*BlankScreen)(ScrnInfoPtr, Bool),
+                       int vertsyncreg, int maskval, int knownclkindex,
+                       int knownclkvalue);
+	  </programlisting>
+	  <blockquote><para>
+      This function uses a comparative sampling method to measure the
+      discrete pixel clock values.  The number of discrete clocks to
+      measure is given by <parameter>num</parameter>.  <parameter>clockFunc</parameter>
+      is a function that selects the <parameter>n</parameter>'th clock.  It
+      should also save or restore any state affected by programming the
+      clocks when the index passed is <constant>CLK_REG_SAVE</constant> or
+      <constant>CLK_REG_RESTORE</constant>.  <parameter>ProtectRegs</parameter> is
+      a function that does whatever is required to protect the hardware
+      state while selecting a new clock.  <parameter>BlankScreen</parameter>
+      is a function that blanks the screen.  <parameter>vertsyncreg</parameter>
+      and <parameter>maskval</parameter> are the register and bitmask to
+      check for the presence of vertical sync pulses.
+      <parameter>knownclkindex</parameter> and <parameter>knownclkvalue</parameter>
+      are the index and value of a known clock.  These are the known
+      references on which the comparative measurements are based.  The
+      number of clocks probed is set in <structfield>pScrn-&gt;numClocks</structfield>,
+      and the probed clocks are set in the <structfield>pScrn-&gt;clock[]</structfield>
+      array.  All of the clock values are in units of kHz.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void xf86ShowClocks(ScrnInfoPtr scrp, MessageType from);
+	  </programlisting>
+	  <blockquote><para>
+      Print out the pixel clocks <parameter>scrp-&gt;clock[]</parameter>.
+      <parameter>from</parameter> indicates whether the clocks were probed
+      or from the config file.
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </sect2>
+
+    <sect2>
+      <title>Other helper functions</title>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool xf86IsUnblank(int mode);
+	  </programlisting>
+	  <blockquote><para>
+      Returns <constant>TRUE</constant> when the screen saver mode specified
+      by <parameter>mode</parameter> requires the screen be unblanked,
+      and <constant>FALSE</constant> otherwise.  The screen saver modes that
+      require blanking are <constant>SCREEN_SAVER_ON</constant> and
+      <constant>SCREEN_SAVER_CYCLE</constant>, and the screen saver modes that
+      require unblanking are <constant>SCREEN_SAVER_OFF</constant> and
+      <constant>SCREEN_SAVER_FORCER</constant>.  Drivers may call this helper
+      from their <function>SaveScreen()</function> function to interpret the
+      screen saver modes.
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </sect2>
+  </sect1>
+
+  <sect1>
+    <title>The vgahw module</title>
+
+    <para>
+The vgahw modules provides an interface for saving, restoring and
+programming the standard VGA registers, and for handling VGA colourmaps.
+    </para>
+
+    <sect2>
+      <title>Data Structures</title>
+
+      <para>
+    The public data structures used by the vgahw module are
+    <structname>vgaRegRec</structname> and <structname>vgaHWRec</structname>.  They are
+    defined in <filename>vgaHW.h.</filename>
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>General vgahw Functions</title>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool vgaHWGetHWRec(ScrnInfoPtr pScrn);
+	  </programlisting>
+	  <blockquote><para>
+      This function allocates a <structname>vgaHWRec</structname> structure, and
+      hooks it into the <structname>ScrnInfoRec</structname>'s
+      <structfield>privates</structfield>.  Like all information hooked into the
+      <structfield>privates</structfield>, it is persistent, and only needs to be
+      allocated once per screen.  This function should normally be called
+      from the driver's <function>ChipPreInit()</function> function.  The
+      <structname>vgaHWRec</structname> is zero-allocated, and the following
+      fields are explicitly initialised:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><structfield>ModeReg.DAC[]</structfield></term>
+		  <listitem><para>initialised with a default colourmap
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>ModeReg.Attribute[0x11]</structfield></term>
+		  <listitem><para>initialised with the default overscan index
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>ShowOverscan</structfield></term>
+		  <listitem><para>initialised according to the "ShowOverscan" option
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>paletteEnabled</structfield></term>
+		  <listitem><para>initialised to FALSE
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>cmapSaved</structfield></term>
+		  <listitem><para>initialised to FALSE
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><structfield>pScrn</structfield></term>
+		  <listitem><para>initialised to pScrn
+		    </para></listitem></varlistentry>
+	      </variablelist>
+	    </para>
+
+	    <para>
+      In addition to the above, <function>vgaHWSetStdFuncs()</function> is
+      called to initialise the register access function fields with the
+      standard VGA set of functions.
+	    </para>
+
+	    <para>
+      Once allocated, a pointer to the <structname>vgaHWRec</structname> can be
+      obtained from the <literal remap="tt">ScrnInfoPtr</literal> with the
+      <literal remap="tt">VGAHWPTR(pScrn)</literal> macro.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWFreeHWRec(ScrnInfoPtr pScrn);
+	  </programlisting>
+	  <blockquote><para>
+      This function frees a <structname>vgaHWRec</structname> structure.  It
+      should be called from a driver's <function>ChipFreeScreen()</function>
+      function.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool vgaHWSetRegCounts(ScrnInfoPtr pScrn, int numCRTC,
+                          int numSequencer, int numGraphics, int numAttribute);
+	  </programlisting>
+	  <blockquote><para>
+      This function allows the number of CRTC, Sequencer, Graphics and
+      Attribute registers to be changed.  This makes it possible for
+      extended registers to be saved and restored with
+      <function>vgaHWSave()</function> and <function>vgaHWRestore()</function>.
+      This function should be called after a <structname>vgaHWRec</structname>
+      has been allocated with <function>vgaHWGetHWRec()</function>.  The
+      default values are defined in <filename>vgaHW.h</filename> as follows:
+
+	      <programlisting>
+#define VGA_NUM_CRTC 25
+#define VGA_NUM_SEQ   5
+#define VGA_NUM_GFX   9
+#define VGA_NUM_ATTR 21
+	      </programlisting>
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool vgaHWCopyReg(vgaRegPtr dst, vgaRegPtr src);
+	  </programlisting>
+	  <blockquote><para>
+      This function copies the contents of the VGA saved registers in
+      <parameter>src</parameter> to <parameter>dst</parameter>.  Note that it isn't
+      possible to simply do this with <function>memcpy()</function> (or
+      similar).  This function returns <constant>TRUE</constant> unless there
+      is a problem allocating space for the <structfield>CRTC</structfield> and
+      related fields in <parameter>dst</parameter>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWSetStdFuncs(vgaHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      This function initialises the register access function fields of
+      <parameter>hwp</parameter> with the standard VGA set of functions.  This
+      is called by <function>vgaHWGetHWRec()</function>, so there is usually
+      no need to call this explicitly.  The register access functions
+      are described below.  If the registers are shadowed in some other
+      port I/O space (for example a PCI I/O region), these functions
+      can be used to access the shadowed registers if
+      <structfield>hwp-&gt;PIOOffset</structfield> is initialised with
+      <literal remap="tt">offset</literal>, calculated in such a way that when the
+      standard VGA I/O port value is added to it the correct offset into
+      the PIO area results.  This value is initialised to zero in
+      <function>vgaHWGetHWRec()</function>.  (Note: the PIOOffset functionality
+      is present in XFree86 4.1.0 and later.)
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWSetMmioFuncs(vgaHWPtr hwp, CARD8 *base, int offset);
+	  </programlisting>
+	  <blockquote><para>
+      This function initialised the register access function fields of
+      hwp with a generic MMIO set of functions.
+      <structfield>hwp-&gt;MMIOBase</structfield> is initialised with
+      <parameter>base</parameter>, which must be the virtual address that the
+      start of MMIO area is mapped to.  <structfield>hwp-&gt;MMIOOffset</structfield>
+      is initialised with <parameter>offset</parameter>, which must be calculated
+      in such a way that when the standard VGA I/O port value is added
+      to it the correct offset into the MMIO area results.  That means
+      that these functions are only suitable when the VGA I/O ports are
+      made available in a direct mapping to the MMIO space.  If that is
+      not the case, the driver will need to provide its own register
+      access functions.  The register access functions are described
+      below.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool vgaHWMapMem(ScrnInfoPtr pScrn);
+	  </programlisting>
+	  <blockquote><para>
+      This function maps the VGA memory window.  It requires that the
+      <structname>vgaHWRec</structname> be allocated.  If a driver requires
+      non-default <structfield>MapPhys</structfield> or <structfield>MapSize</structfield>
+      settings (the physical location and size of the VGA memory window)
+      then those fields of the <structname>vgaHWRec</structname> must be initialised
+      before calling this function.  Otherwise, this function initialiases
+      the default values of <constant>0xA0000</constant> for
+      <structfield>MapPhys</structfield> and <code>(64&nbsp;*&nbsp;1024)</code> for
+      <structfield>MapSize</structfield>.  This function must be called before
+      attempting to save or restore the VGA state.  If the driver doesn't
+      call it explicitly, the <function>vgaHWSave()</function> and
+      <function>vgaHWRestore()</function> functions may call it if they need
+      to access the VGA memory (in which case they will also call
+      <function>vgaHWUnmapMem()</function> to unmap the VGA memory before
+      exiting).
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWUnmapMem(ScrnInfoPtr pScrn);
+	  </programlisting>
+	  <blockquote><para>
+      This function unmaps the VGA memory window.  It must only be called
+      after the memory has been mapped.  The <structfield>Base</structfield> field
+      of the <structname>vgaHWRec</structname> field is set to <constant>NULL</constant>
+      to indicate that the memory is no longer mapped.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWGetIOBase(vgaHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      This function initialises the <structfield>IOBase</structfield> field of the
+      <structname>vgaHWRec</structname>.  This function must be called before
+      using any other functions that access the video hardware.
+	    </para>
+
+	    <para>
+      A macro <function>VGAHW_GET_IOBASE()</function> is also available in
+      <filename>vgaHW.h</filename> that returns the I/O base, and this may
+      be used when the vgahw module is not loaded (for example, in the
+      <function>ChipProbe()</function> function).
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWUnlock(vgaHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      This function unlocks the VGA <literal remap="tt">CRTC[0-7]</literal> registers,
+      and must be called before attempting to write to those registers.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWLock(vgaHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      This function locks the VGA <literal remap="tt">CRTC[0-7]</literal> registers.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWEnable(vgaHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      This function enables the VGA subsystem.  (Note, this function is
+      present in XFree86 4.1.0 and later.).
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWDisable(vgaHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      This function disables the VGA subsystem.  (Note, this function is
+      present in XFree86 4.1.0 and later.).
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWSave(ScrnInfoPtr pScrn, vgaRegPtr save, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      This function saves the VGA state.  The state is written to the
+      <structname>vgaRegRec</structname> pointed to by <parameter>save</parameter>.
+      <parameter>flags</parameter> is set to one or more of the following flags
+      ORed together:
+
+	      <variablelist>
+		<varlistentry>
+		  <term><constant>VGA_SR_MODE</constant></term>
+		  <listitem><para>the mode setting registers are saved
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>VGA_SR_FONTS</constant></term>
+		  <listitem><para>the text mode font/text data is saved
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>VGA_SR_CMAP</constant></term>
+		  <listitem><para>the colourmap (LUT) is saved
+		    </para></listitem></varlistentry>
+		<varlistentry>
+		  <term><constant>VGA_SR_ALL</constant></term>
+		  <listitem><para>all of the above are saved
+		    </para></listitem></varlistentry>
+	      </variablelist>
+	    </para>
+
+	    <para>
+      The <structname>vgaHWRec</structname> and its <structfield>IOBase</structfield> fields
+      must be initialised before this function is called.  If
+      <constant>VGA_SR_FONTS</constant> is set in <parameter>flags</parameter>, the
+      VGA memory window must be mapped.  If it isn't then
+      <function>vgaHWMapMem()</function> will be called to map it, and
+      <function>vgaHWUnmapMem()</function> will be called to unmap it
+      afterwards.  <function>vgaHWSave()</function> uses the three functions
+      below in the order <function>vgaHWSaveColormap()</function>,
+      <function>vgaHWSaveMode()</function>, <function>vgaHWSaveFonts()</function> to
+      carry out the different save phases.  It is undecided at this
+      stage whether they will remain part of the vgahw module's public
+      interface or not.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWSaveMode(ScrnInfoPtr pScrn, vgaRegPtr save);
+	  </programlisting>
+	  <blockquote><para>
+      This function saves the VGA mode registers.  They are saved to
+      the <structname>vgaRegRec</structname> pointed to by <parameter>save</parameter>.
+      The registers saved are:
+
+	      <literallayout>
+        MiscOut
+        CRTC[0-0x18]
+        Attribute[0-0x14]
+        Graphics[0-8]
+        Sequencer[0-4]
+	      </literallayout>
+	    </para>
+
+	    <para>
+    The number of registers actually saved may be modified by a prior call
+    to <function>vgaHWSetRegCounts()</function>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWSaveFonts(ScrnInfoPtr pScrn, vgaRegPtr save);
+	  </programlisting>
+	  <blockquote><para>
+      This function saves the text mode font and text data held in the
+      video memory.  If called while in a graphics mode, no save is
+      done.  The VGA memory window must be mapped with
+      <function>vgaHWMapMem()</function> before to calling this function.
+	    </para>
+
+	    <para>
+      On some platforms, one or more of the font/text plane saves may be
+      no-ops.  This is the case when the platform's VC driver already
+      takes care of this.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWSaveColormap(ScrnInfoPtr pScrn, vgaRegPtr save);
+	  </programlisting>
+	  <blockquote><para>
+      This function saves the VGA colourmap (LUT).  Before saving it, it
+      attempts to verify that the colourmap is readable.  In rare cases
+      where it isn't readable, a default colourmap is saved instead.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWRestore(ScrnInfoPtr pScrn, vgaRegPtr restore, int flags);
+	  </programlisting>
+	  <blockquote><para>
+      This function programs the VGA state.  The state programmed is
+      that contained in the <structname>vgaRegRec</structname> pointed to by
+      <parameter>restore</parameter>.  <parameter>flags</parameter> is the same
+      as described above for the <function>vgaHWSave()</function> function.
+	    </para>
+
+	    <para>
+      The <structname>vgaHWRec</structname> and its <structfield>IOBase</structfield> fields
+      must be initialised before this function is called.  If
+      <constant>VGA_SR_FONTS</constant> is set in <parameter>flags</parameter>, the
+      VGA memory window must be mapped.  If it isn't then
+      <function>vgaHWMapMem()</function> will be called to map it, and
+      <function>vgaHWUnmapMem()</function> will be called to unmap it
+      afterwards.  <function>vgaHWRestore()</function> uses the three functions
+      below in the order <function>vgaHWRestoreFonts()</function>,
+      <function>vgaHWRestoreMode()</function>,
+      <function>vgaHWRestoreColormap()</function> to carry out the different
+      restore phases.  It is undecided at this stage whether they will
+      remain part of the vgahw module's public interface or not.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWRestoreMode(ScrnInfoPtr pScrn, vgaRegPtr restore);
+	  </programlisting>
+	  <blockquote><para>
+      This function restores the VGA mode registers.  They are restored
+      from the data in the <structname>vgaRegRec</structname> pointed to by
+      <parameter>restore</parameter>.  The registers restored are:
+
+	      <literallayout>
+        MiscOut
+        CRTC[0-0x18]
+        Attribute[0-0x14]
+        Graphics[0-8]
+        Sequencer[0-4]
+	      </literallayout>
+	    </para>
+
+	    <para>
+    The number of registers actually restored may be modified by a prior call
+    to <function>vgaHWSetRegCounts()</function>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWRestoreFonts(ScrnInfoPtr pScrn, vgaRegPtr restore);
+	  </programlisting>
+	  <blockquote><para>
+      This function restores the text mode font and text data to the
+      video memory.  The VGA memory window must be mapped with
+      <function>vgaHWMapMem()</function> before to calling this function.
+	    </para>
+
+	    <para>
+      On some platforms, one or more of the font/text plane restores
+      may be no-ops.  This is the case when the platform's VC driver
+      already takes care of this.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWRestoreColormap(ScrnInfoPtr pScrn, vgaRegPtr restore);
+	  </programlisting>
+	  <blockquote><para>
+      This function restores the VGA colourmap (LUT).
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWInit(ScrnInfoPtr pScrn, DisplayModePtr mode);
+	  </programlisting>
+	  <blockquote><para>
+      This function fills in the <structname>vgaHWRec</structname>'s
+      <structfield>ModeReg</structfield> field with the values appropriate for
+      programming the given video mode.  It requires that the
+      <structname>ScrnInfoRec</structname>'s <structfield>depth</structfield> field is
+      initialised, which determines how the registers are programmed.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWSeqReset(vgaHWPtr hwp, Bool start);
+	  </programlisting>
+	  <blockquote><para>
+      Do a VGA sequencer reset.  If start is <constant>TRUE</constant>, the
+      reset is started.  If start is <constant>FALSE</constant>, the reset
+      is ended.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWProtect(ScrnInfoPtr pScrn, Bool on);
+	  </programlisting>
+	  <blockquote><para>
+      This function protects VGA registers and memory from corruption
+      during loads.  It is typically called with on set to
+      <constant>TRUE</constant> before programming, and with on set to
+      <constant>FALSE</constant> after programming.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    Bool vgaHWSaveScreen(ScreenPtr pScreen, int mode);
+	  </programlisting>
+	  <blockquote><para>
+      This function blanks and unblanks the screen.  It is blanked when
+      <parameter>mode</parameter> is <constant>SCREEN_SAVER_ON</constant> or
+      <constant>SCREEN_SAVER_CYCLE</constant>, and unblanked when
+      <parameter>mode</parameter> is <constant>SCREEN_SAVER_OFF</constant> or
+      <constant>SCREEN_SAVER_FORCER</constant>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void vgaHWBlankScreen(ScrnInfoPtr pScrn, Bool on);
+	  </programlisting>
+	  <blockquote><para>
+      This function blanks and unblanks the screen.  It is blanked when
+      <parameter>on</parameter> is <constant>FALSE</constant>, and unblanked when
+      <parameter>on</parameter> is <constant>TRUE</constant>.  This function is
+      provided for use in cases where the <structname>ScrnInfoRec</structname>
+      can't be derived from the <structname>ScreenRec</structname> (while probing
+      for clocks, for example).
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+    </sect2>
+
+    <sect2>
+      <title>VGA Colormap Functions</title>
+
+      <para>
+    The vgahw module uses the standard colormap support (see the
+    <link linkend="cmap">Colormap Handling</link> section.  This is initialised
+    with the following function:
+
+	<blockquote><para>
+	  <programlisting>
+    Bool vgaHWHandleColormaps(ScreenPtr pScreen);
+	    </programlisting>
+	  </para></blockquote>
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>VGA Register Access Functions</title>
+
+      <para>
+    The vgahw module abstracts access to the standard VGA registers by
+    using a set of functions held in the <structname>vgaHWRec</structname>.  When
+    the <structname>vgaHWRec</structname> is created these function pointers are
+    initialised with the set of standard VGA I/O register access functions.
+    In addition to these, the vgahw module includes a basic set of MMIO
+    register access functions, and the <structname>vgaHWRec</structname> function
+    pointers can be initialised to these by calling the
+    <function>vgaHWSetMmioFuncs()</function> function described above.  Some
+    drivers/platforms may require a different set of functions for VGA
+    access.  The access functions are described here.
+      </para>
+
+
+      <blockquote><para>
+	  <programlisting>
+    void writeCrtc(vgaHWPtr hwp, CARD8 index, CARD8 value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to CRTC register <parameter>index</parameter>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    CARD8 readCrtc(vgaHWPtr hwp, CARD8 index);
+	  </programlisting>
+	  <blockquote><para>
+      Return the value read from CRTC register <parameter>index</parameter>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeGr(vgaHWPtr hwp, CARD8 index, CARD8 value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to Graphics Controller register
+      <parameter>index</parameter>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    CARD8 readGR(vgaHWPtr hwp, CARD8 index);
+	  </programlisting>
+	  <blockquote><para>
+      Return the value read from Graphics Controller register
+      <parameter>index</parameter>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeSeq(vgaHWPtr hwp, CARD8 index, CARD8, value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to Sequencer register
+      <parameter>index</parameter>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    CARD8 readSeq(vgaHWPtr hwp, CARD8 index);
+	  </programlisting>
+	  <blockquote><para>
+      Return the value read from Sequencer register <parameter>index</parameter>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeAttr(vgaHWPtr hwp, CARD8 index, CARD8, value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to Attribute Controller register
+      <parameter>index</parameter>.  When writing out the index value this
+      function should set bit 5 (<constant>0x20</constant>) according to the
+      setting of <structfield>hwp-&gt;paletteEnabled</structfield> in order to
+      preserve the palette access state.  It should be cleared when
+      <structfield>hwp-&gt;paletteEnabled</structfield> is <constant>TRUE</constant>
+      and set when it is <constant>FALSE</constant>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    CARD8 readAttr(vgaHWPtr hwp, CARD8 index);
+	  </programlisting>
+	  <blockquote><para>
+      Return the value read from Attribute Controller register
+      <parameter>index</parameter>.  When writing out the index value this
+      function should set bit 5 (<constant>0x20</constant>) according to the
+      setting of <structfield>hwp-&gt;paletteEnabled</structfield> in order to
+      preserve the palette access state.  It should be cleared when
+      <structfield>hwp-&gt;paletteEnabled</structfield> is <constant>TRUE</constant>
+      and set when it is <constant>FALSE</constant>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeMiscOut(vgaHWPtr hwp, CARD8 value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <quote><parameter>value</parameter></quote> to the Miscellaneous Output register.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    CARD8 readMiscOut(vgwHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      Return the value read from the Miscellaneous Output register.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void enablePalette(vgaHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      Clear the palette address source bit in the Attribute Controller
+      index register and set <literal remap="tt">hwp-&gt;paletteEnabled</literal> to
+      <constant>TRUE</constant>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void disablePalette(vgaHWPtr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      Set the palette address source bit in the Attribute Controller
+      index register and set <literal remap="tt">hwp-&gt;paletteEnabled</literal> to
+      <constant>FALSE</constant>.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeDacMask(vgaHWPtr hwp, CARD8 value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to the DAC Mask register.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    CARD8 readDacMask(vgaHWptr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      Return the value read from the DAC Mask register.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeDacReadAddress(vgaHWPtr hwp, CARD8 value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to the DAC Read Address register.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeDacWriteAddress(vgaHWPtr hwp, CARD8 value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to the DAC Write Address register.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeDacData(vgaHWPtr hwp, CARD8 value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to the DAC Data register.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    CARD8 readDacData(vgaHWptr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      Return the value read from the DAC Data register.
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    CARD8 readEnable(vgaHWptr hwp);
+	  </programlisting>
+	  <blockquote><para>
+      Return the value read from the VGA Enable register.  (Note: This
+      function is present in XFree86 4.1.0 and later.)
+	    </para>
+
+	  </blockquote></para></blockquote>
+
+      <blockquote><para>
+	  <programlisting>
+    void writeEnable(vgaHWPtr hwp, CARD8 value);
+	  </programlisting>
+	  <blockquote><para>
+      Write <parameter>value</parameter> to the VGA Enable register.  (Note: This
+      function is present in XFree86 4.1.0 and later.)
+	    </para>
+
+	  </blockquote></para></blockquote>
+    </sect2>
+  </sect1>
+
+  <sect1 id="sample">
+    <title>Some notes about writing a driver</title>
+
+    <note><para>NOTE: some parts of this are not up to date</para></note>
+
+    <para>
+The following is an outline for writing a basic unaccelerated driver
+for a PCI video card with a linear mapped framebuffer, and which has a
+VGA core.  It is includes some general information that is relevant to
+most drivers (even those which don't fit that basic description).
+    </para>
+
+    <para>
+The information here is based on the initial conversion of the Matrox
+Millennium driver to the <quote>new design</quote>.  For a fleshing out and sample
+implementation of some of the bits outlined here, refer to that driver.
+Note that this is an example only.  The approach used here will not be
+appropriate for all drivers.
+    </para>
+
+    <para>
+Each driver must reserve a unique driver name, and a string that is used
+to prefix all of its externally visible symbols.  This is to avoid name
+space clashes when loading multiple drivers.  The examples here are for
+the <quote>ZZZ</quote> driver, which uses the <quote>ZZZ</quote> or <quote>zzz</quote> prefix for its externally
+visible symbols.
+    </para>
+
+    <sect2>
+      <title>Include files</title>
+
+      <para>
+  All drivers normally include the following headers:
+	<literallayout><filename>
+    "xf86.h"
+    "xf86_OSproc.h"
+    "xf86_ansic.h"
+    "xf86Resources.h"
+	  </filename></literallayout>
+  Wherever inb/outb (and related things) are used the following should be
+  included:
+	<literallayout><filename>
+    "compiler.h"
+	  </filename></literallayout>
+  Note: in drivers, this must be included after <filename>"xf86_ansic.h"</filename>.
+      </para>
+
+      <para>
+  Drivers that need to access PCI vendor/device definitions need this:
+	<literallayout><filename>
+    "xf86PciInfo.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  Drivers that need to access the PCI config space need this:
+	<literallayout><filename>
+    "xf86Pci.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  Drivers using the mi banking wrapper need:
+
+	<literallayout><filename>
+    "mibank.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  Drivers that initialise a SW cursor need this:
+	<literallayout><filename>
+    "mipointer.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  All drivers implementing backing store need this:
+	<literallayout><filename>
+    "mibstore.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  All drivers using the mi colourmap code need this:
+	<literallayout><filename>
+    "micmap.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  If a driver uses the vgahw module, it needs this:
+	<literallayout><filename>
+    "vgaHW.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  Drivers supporting VGA or Hercules monochrome screens need:
+	<literallayout><filename>
+    "xf1bpp.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  Drivers supporting VGA or EGC 16-colour screens need:
+	<literallayout><filename>
+    "xf4bpp.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  Drivers using cfb need:
+	<programlisting>
+    #define PSZ 8
+    #include "cfb.h"
+    #undef PSZ
+	</programlisting>
+      </para>
+
+      <para>
+  Drivers supporting bpp 16, 24 or 32 with cfb need one or more of:
+	<literallayout><filename>
+    "cfb16.h"
+    "cfb24.h"
+    "cfb32.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  The driver's own header file:
+	<literallayout><filename>
+    "zzz.h"
+	  </filename></literallayout>
+      </para>
+
+      <para>
+  Drivers must NOT include the following:
+
+	<literallayout><filename>
+    "xf86Priv.h"
+    "xf86Privstr.h"
+    "xf86_libc.h"
+    "xf86_OSlib.h"
+    "Xos.h"</filename>
+    any OS header
+	</literallayout>
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>Data structures and initialisation</title>
+
+      <itemizedlist>
+	<listitem>
+	  <para>The following macros should be defined:
+	    <programlisting>
+#define VERSION &lt;version-as-an-int&gt;
+#define ZZZ_NAME "ZZZ"         /* the name used to prefix messages */
+#define ZZZ_DRIVER_NAME "zzz"  /* the driver name as used in config file */
+#define ZZZ_MAJOR_VERSION &lt;int&gt;
+#define ZZZ_MINOR_VERSION &lt;int&gt;
+#define ZZZ_PATCHLEVEL    &lt;int&gt;
+	    </programlisting>
+	  </para>
+	  <para>
+    NOTE: <constant>ZZZ_DRIVER_NAME</constant> should match the name of the
+    driver module without things like the "lib" prefix, the "_drv" suffix
+    or filename extensions.
+	  </para>
+	</listitem>
+
+	<listitem>
+	  <para>
+    A DriverRec must be defined, which includes the functions required
+    at the pre-probe phase.  The name of this DriverRec must be an
+    upper-case version of ZZZ_DRIVER_NAME (for the purposes of static
+    linking).
+	    <programlisting>
+DriverRec ZZZ = {
+    VERSION,
+    ZZZ_DRIVER_NAME,
+    ZZZIdentify,
+    ZZZProbe,
+    ZZZAvailableOptions,
+    NULL,
+    0
+};
+	    </programlisting>
+	  </para>
+	</listitem>
+
+	<listitem>
+	  <para>Define list of supported chips and their matching ID:
+	    <programlisting>
+static SymTabRec ZZZChipsets[] = {
+    { PCI_CHIP_ZZZ1234, "zzz1234a" },
+    { PCI_CHIP_ZZZ5678, "zzz5678a" },
+    { -1,               NULL }
+};
+	    </programlisting>
+	  </para>
+	  <para>
+    The token field may be any integer value that the driver may use to
+    uniquely identify the supported chipsets.  For drivers that support
+    only PCI devices using the PCI device IDs might be a natural choice,
+    but this isn't mandatory.  For drivers that support both PCI and other
+    devices (like ISA), some other ID should probably used.  When other
+    IDs are used as the tokens it is recommended that the names be
+    defined as an <type>enum</type> type.
+	  </para>
+	</listitem>
+
+	<listitem>
+	  <para>
+    If the driver uses the <function>xf86MatchPciInstances()</function>
+    helper (recommended for drivers that support PCI cards) a list that
+    maps PCI IDs to chip IDs and fixed resources must be defined:
+	    <programlisting>
+static PciChipsets ZZZPciChipsets[] = {
+    { PCI_CHIP_ZZZ1234, PCI_CHIP_ZZZ1234, RES_SHARED_VGA },
+    { PCI_CHIP_ZZZ5678, PCI_CHIP_ZZZ5678, RES_SHARED_VGA },
+    { -1,               -1,               RES_UNDEFINED }
+}
+	    </programlisting>
+	  </para>
+	</listitem>
+
+	<listitem>
+	  <para>
+    Define the <structname>XF86ModuleVersionInfo</structname> struct for the
+    driver.  This is required for the dynamically loaded version:
+	    <programlisting>
+static XF86ModuleVersionInfo zzzVersRec =
+{
+    "zzz",
+    MODULEVENDORSTRING,
+    MODINFOSTRING1,
+    MODINFOSTRING2,
+    XF86_VERSION_CURRENT,
+    ZZZ_MAJOR_VERSION, ZZZ_MINOR_VERSION, ZZZ_PATCHLEVEL,
+    ABI_CLASS_VIDEODRV,
+    ABI_VIDEODRV_VERSION,
+    MOD_CLASS_VIDEODRV,
+    {0,0,0,0}
+};
+	    </programlisting>
+	  </para>
+	</listitem>
+
+	<listitem>
+	  <para>
+    Define a data structure to hold the driver's screen-specific data.
+    This must be used instead of global variables.  This would be defined
+    in the <filename>"zzz.h"</filename> file, something like:
+	    <programlisting>
+typedef struct {
+    type1  field1;
+    type2  field2;
+    int    fooHack;
+    Bool   pciRetry;
+    Bool   noAccel;
+    Bool   hwCursor;
+    CloseScreenProcPtr CloseScreen;
+    OptionInfoPtr Options;
+    ...
+} ZZZRec, *ZZZPtr;
+	    </programlisting>
+	  </para>
+	</listitem>
+
+	<listitem>
+	  <para>
+    Define the list of config file Options that the driver accepts.  For
+    consistency between drivers those in the list of <quote>standard</quote> options
+    should be used where appropriate before inventing new options.
+
+	    <programlisting>
+typedef enum {
+    OPTION_FOO_HACK,
+    OPTION_PCI_RETRY,
+    OPTION_HW_CURSOR,
+    OPTION_NOACCEL
+} ZZZOpts;
+
+static const OptionInfoRec ZZZOptions[] = {
+  { OPTION_FOO_HACK,  "FooHack",   OPTV_INTEGER, {0}, FALSE },
+  { OPTION_PCI_RETRY, "PciRetry",  OPTV_BOOLEAN, {0}, FALSE },
+  { OPTION_HW_CURSOR, "HWcursor",  OPTV_BOOLEAN, {0}, FALSE },
+  { OPTION_NOACCEL,   "NoAccel",   OPTV_BOOLEAN, {0}, FALSE },
+  { -1,               NULL,        OPTV_NONE,    {0}, FALSE }
+};
+	    </programlisting>
+	  </para>
+	</listitem>
+      </itemizedlist>
+    </sect2>
+
+    <sect2>
+      <title>Functions</title>
+
+
+      <sect3>
+	<title>SetupProc</title>
+
+	<para>
+    For dynamically loaded modules, a <varname>ModuleData</varname>
+    variable is required.  It is should be the name of the driver
+    prepended to "ModuleData".  A <function>Setup()</function> function is
+    also required, which calls <function>xf86AddDriver()</function> to add
+    the driver to the main list of drivers.
+	</para>
+
+	<programlisting>
+static MODULESETUPPROTO(zzzSetup);
+
+XF86ModuleData zzzModuleData = { &amp;zzzVersRec, zzzSetup, NULL };
+
+static pointer
+zzzSetup(pointer module, pointer opts, int *errmaj, int *errmin)
+{
+    static Bool setupDone = FALSE;
+
+    /* This module should be loaded only once, but check to be sure. */
+
+    if (!setupDone) {
+        /*
+         * Modules that this driver always requires may be loaded
+         * here  by calling LoadSubModule().
+         */
+
+        setupDone = TRUE;
+        xf86AddDriver(&amp;MGA, module, 0);
+
+        /*
+         * The return value must be non-NULL on success even though
+         * there is no TearDownProc.
+         */
+        return (pointer)1;
+    } else {
+        if (errmaj) *errmaj = LDR_ONCEONLY;
+        return NULL;
+    }
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>GetRec, FreeRec</title>
+
+	<para>
+    A function is usually required to allocate the driver's
+    screen-specific data structure and hook it into the
+    <structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield> field.
+    The <structname>ScrnInfoRec</structname>'s <structfield>driverPrivate</structfield> is
+    initialised to <constant>NULL</constant>, so it is easy to check if the
+    initialisation has already been done.  After allocating it, initialise
+    the fields.  By using <function>xnfcalloc()</function> to do the allocation
+    it is zeroed, and if the allocation fails the server exits.
+	</para>
+
+	<para>
+    NOTE:
+    When allocating structures from inside the driver which are defined
+    on the common level it is important to initialize the structure to
+    zero.
+    Only this guarantees that the server remains source compatible to
+    future changes in common level structures.
+	</para>
+
+	<programlisting>
+static Bool
+ZZZGetRec(ScrnInfoPtr pScrn)
+{
+    if (pScrn-&gt;driverPrivate != NULL)
+        return TRUE;
+    pScrn-&gt;driverPrivate = xnfcalloc(sizeof(ZZZRec), 1);
+    /* Initialise as required */
+    ...
+    return TRUE;
+}
+	</programlisting>
+
+	<para>
+    Define a macro in <filename>"zzz.h"</filename> which gets a pointer to
+    the <structname>ZZZRec</structname> when given <parameter>pScrn</parameter>:
+
+	  <programlisting>
+#define ZZZPTR(p) ((ZZZPtr)((p)-&gt;driverPrivate))
+	  </programlisting>
+	</para>
+
+	<para>
+    Define a function to free the above, setting it to <constant>NULL</constant>
+    once it has been freed:
+
+	  <programlisting>
+static void
+ZZZFreeRec(ScrnInfoPtr pScrn)
+{
+    if (pScrn-&gt;driverPrivate == NULL)
+        return;
+    xfree(pScrn-&gt;driverPrivate);
+    pScrn-&gt;driverPrivate = NULL;
+}
+	  </programlisting>
+	</para>
+      </sect3>
+
+      <sect3>
+	<title>Identify</title>
+
+	<para>
+    Define the <function>Identify()</function> function.  It is run before
+    the Probe, and typically prints out an identifying message, which
+    might include the chipsets it supports.  This function is mandatory:
+
+	  <programlisting>
+static void
+ZZZIdentify(int flags)
+{
+    xf86PrintChipsets(ZZZ_NAME, "driver for ZZZ Tech chipsets",
+                      ZZZChipsets);
+}
+	  </programlisting>
+	</para>
+      </sect3>
+
+      <sect3>
+	<title>Probe</title>
+
+	<para>
+    Define the <function>Probe()</function> function.  The purpose of this
+    is to find all instances of the hardware that the driver supports,
+    and for the ones not already claimed by another driver, claim the
+    slot, and allocate a <structname>ScrnInfoRec</structname>.  This should be
+    a minimal probe, and it should under no circumstances leave the
+    state of the hardware changed.  Because a device is found, don't
+    assume that it will be used.  Don't do any initialisations other
+    than the required <structname>ScrnInfoRec</structname> initialisations.
+    Don't allocate any new data structures.
+	</para>
+
+	<para>
+    This function is mandatory.
+	</para>
+
+	<para>
+    NOTE: The <function>xf86DrvMsg()</function> functions cannot be used from
+    the Probe.
+	</para>
+
+	<programlisting>
+static Bool
+ZZZProbe(DriverPtr drv, int flags)
+{
+    Bool foundScreen = FALSE;
+    int numDevSections, numUsed;
+    GDevPtr *devSections;
+    int *usedChips;
+    int i;
+
+    /*
+     * Find the config file Device sections that match this
+     * driver, and return if there are none.
+     */
+    if ((numDevSections = xf86MatchDevice(ZZZ_DRIVER_NAME,
+                                          &amp;devSections)) &lt;= 0) {
+        return FALSE;
+    }
+
+    /*
+     * Since this is a PCI card, "probing" just amounts to checking
+     * the PCI data that the server has already collected.  If there
+     * is none, return.
+     *
+     * Although the config file is allowed to override things, it
+     * is reasonable to not allow it to override the detection
+     * of no PCI video cards.
+     *
+     * The provided xf86MatchPciInstances() helper takes care of
+     * the details.
+     */
+    /* test if PCI bus present */
+    if (xf86GetPciVideoInfo()) {
+
+        numUsed = xf86MatchPciInstances(ZZZ_NAME, PCI_VENDOR_ZZZ,
+                            ZZZChipsets, ZZZPciChipsets, devSections,
+                            numDevSections, drv, &amp;usedChips);
+
+        for (i = 0; i &lt; numUsed; i++) {
+            ScrnInfoPtr pScrn = NULL;
+            if ((pScrn = xf86ConfigPciEntity(pScrn, flags, usedChips[i],
+                                             ZZZPciChipsets, NULL, NULL,
+                                             NULL, NULL, NULL))) {
+               /* Allocate a ScrnInfoRec */
+               pScrn-&gt;driverVersion = VERSION;
+               pScrn-&gt;driverName    = ZZZ_DRIVER_NAME;
+               pScrn-&gt;name          = ZZZ_NAME;
+               pScrn-&gt;Probe         = ZZZProbe;
+               pScrn-&gt;PreInit       = ZZZPreInit;
+               pScrn-&gt;ScreenInit    = ZZZScreenInit;
+               pScrn-&gt;SwitchMode    = ZZZSwitchMode;
+               pScrn-&gt;AdjustFrame   = ZZZAdjustFrame;
+               pScrn-&gt;EnterVT       = ZZZEnterVT;
+               pScrn-&gt;LeaveVT       = ZZZLeaveVT;
+               pScrn-&gt;FreeScreen    = ZZZFreeScreen;
+               pScrn-&gt;ValidMode     = ZZZValidMode;
+               foundScreen = TRUE;
+               /* add screen to entity */
+           }
+        }
+        xfree(usedChips);
+    }
+
+#ifdef HAS_ISA_DEVS
+    /*
+     * If the driver supports ISA hardware, the following block
+     * can be included too.
+     */
+    numUsed = xf86MatchIsaInstances(ZZZ_NAME, ZZZChipsets,
+                             ZZZIsaChipsets, drv, ZZZFindIsaDevice,
+                             devSections, numDevSections, &amp;usedChips);
+    for (i = 0; i &lt; numUsed; i++) {
+        ScrnInfoPtr pScrn = NULL;
+	if ((pScrn = xf86ConfigIsaEntity(pScrn, flags, usedChips[i],
+					 ZZZIsaChipsets, NULL, NULL, NULL,
+					 NULL, NULL))) {
+            pScrn-&gt;driverVersion = VERSION;
+            pScrn-&gt;driverName    = ZZZ_DRIVER_NAME;
+            pScrn-&gt;name          = ZZZ_NAME;
+            pScrn-&gt;Probe         = ZZZProbe;
+            pScrn-&gt;PreInit       = ZZZPreInit;
+            pScrn-&gt;ScreenInit    = ZZZScreenInit;
+            pScrn-&gt;SwitchMode    = ZZZSwitchMode;
+            pScrn-&gt;AdjustFrame   = ZZZAdjustFrame;
+            pScrn-&gt;EnterVT       = ZZZEnterVT;
+            pScrn-&gt;LeaveVT       = ZZZLeaveVT;
+            pScrn-&gt;FreeScreen    = ZZZFreeScreen;
+            pScrn-&gt;ValidMode     = ZZZValidMode;
+            foundScreen = TRUE;
+        }
+    }
+    xfree(usedChips);
+#endif /* HAS_ISA_DEVS */
+
+    xfree(devSections);
+    return foundScreen;
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>AvailableOptions</title>
+
+	<para>
+    Define the <function>AvailableOptions()</function> function. The purpose
+    of this is to return the available driver options back to the
+    -configure option, so that an xorg.conf file can be built and the
+    user can see which options are available for them to use.
+	</para>
+      </sect3>
+
+      <sect3>
+	<title>PreInit</title>
+
+	<para>
+    Define the <function>PreInit()</function> function.  The purpose of
+    this is to find all the information required to determine if the
+    configuration is usable, and to initialise those parts of the
+    <structname>ScrnInfoRec</structname> that can be set once at the beginning
+    of the first server generation.  The information should be found in
+    the least intrusive way possible.
+	</para>
+
+	<para>
+    This function is mandatory.
+	</para>
+
+	<para>
+    NOTES:
+	  <orderedlist>
+	    <listitem><para>
+	 The <function>PreInit()</function> function is only called once
+	 during the life of the X server (at the start of the first
+	 generation).
+	      </para></listitem>
+
+	    <listitem><para>
+	 Data allocated here must be of the type that persists for
+	 the life of the X server.  This means that data that hooks into
+	 the <structname>ScrnInfoRec</structname>'s <structfield>privates</structfield>
+	 field should be allocated here, but data that hooks into the
+	 <structname>ScreenRec</structname>'s <structfield>devPrivates</structfield> field
+	 should not be allocated here.  The <structfield>driverPrivate</structfield>
+	 field should also be allocated here.
+	      </para></listitem>
+
+	    <listitem><para>
+	 Although the <structname>ScrnInfoRec</structname> has been allocated
+	 before this function is called, the <structname>ScreenRec</structname>
+	 has not been allocated.  That means that things requiring it
+	 cannot be used in this function.
+	      </para></listitem>
+
+	    <listitem><para>
+	 Very little of the <structname>ScrnInfoRec</structname> has been
+	 initialised when this function is called.  It is important to
+	 get the order of doing things right in this function.
+	      </para></listitem>
+
+	  </orderedlist>
+	</para>
+
+	<programlisting>
+static Bool
+ZZZPreInit(ScrnInfoPtr pScrn, int flags)
+{
+    /* Fill in the monitor field */
+    pScrn-&gt;monitor = pScrn-&gt;confScreen-&gt;monitor;
+
+    /*
+     * If using the vgahw module, it will typically be loaded
+     * here by calling xf86LoadSubModule(pScrn, "vgahw");
+     */
+
+    /*
+     * Set the depth/bpp.  Use the globally preferred depth/bpp.  If the
+     * driver has special default depth/bpp requirements, the defaults should
+     * be specified here explicitly.
+     * We support both 24bpp and 32bpp framebuffer layouts.
+     * This sets pScrn-&gt;display also.
+     */
+    if (!xf86SetDepthBpp(pScrn, 0, 0, 0,
+                         Support24bppFb | Support32bppFb)) {
+        return FALSE;
+    } else {
+        if (depth/bpp isn't one we support) {
+            print error message;
+            return FALSE;
+        }
+    }
+    /* Print out the depth/bpp that was set */
+    xf86PrintDepthBpp(pScrn);
+
+    /* Set bits per RGB for 8bpp */
+    if (pScrn-&gt;depth &lt;= 8) {
+        /* Take into account a dac_6_bit option here */
+        pScrn-&gt;rgbBits = 6 or 8;
+    }
+
+    /*
+     * xf86SetWeight() and xf86SetDefaultVisual() must be called
+     * after pScrn-&gt;display is initialised.
+     */
+
+    /* Set weight/mask/offset for depth &gt; 8 */
+    if (pScrn-&gt;depth &gt; 8) {
+        if (!xf86SetWeight(pScrn, defaultWeight, defaultMask)) {
+            return FALSE;
+        } else {
+            if (weight isn't one we support) {
+                print error message;
+                return FALSE;
+            }
+        }
+    }
+
+    /* Set the default visual. */
+    if (!xf86SetDefaultVisual(pScrn, -1)) {
+        return FALSE;
+    } else {
+        if (visual isn't one we support) {
+            print error message;
+            return FALSE;
+        }
+    }
+
+    /* If the driver supports gamma correction, set the gamma. */
+    if (!xf86SetGamma(pScrn, default_gamma)) {
+        return FALSE;
+    }
+
+    /* This driver uses a programmable clock */
+    pScrn-&gt;progClock = TRUE;
+
+    /* Allocate the ZZZRec driverPrivate */
+    if (!ZZZGetRec(pScrn)) {
+        return FALSE;
+    }
+
+    pZzz = ZZZPTR(pScrn);
+
+    /* Collect all of the option flags (fill in pScrn-&gt;options) */
+    xf86CollectOptions(pScrn, NULL);
+
+    /*
+     * Process the options based on the information in ZZZOptions.
+     * The results are written to pZzz-&gt;Options.  If all of the options
+     * processing is done within this function a local variable "options"
+     * can be used instead of pZzz-&gt;Options.
+     */
+    if (!(pZzz-&gt;Options = xalloc(sizeof(ZZZOptions))))
+        return FALSE;
+    (void)memcpy(pZzz-&gt;Options, ZZZOptions, sizeof(ZZZOptions));
+    xf86ProcessOptions(pScrn-&gt;scrnIndex, pScrn-&gt;options, pZzz-&gt;Options);
+
+    /*
+     * Set various fields of ScrnInfoRec and/or ZZZRec based on
+     * the options found.
+     */
+    from = X_DEFAULT;
+    pZzz-&gt;hwCursor = FALSE;
+    if (xf86IsOptionSet(pZzz-&gt;Options, OPTION_HW_CURSOR)) {
+        from = X_CONFIG;
+        pZzz-&gt;hwCursor = TRUE;
+    }
+    xf86DrvMsg(pScrn-&gt;scrnIndex, from, "Using %s cursor\n",
+               pZzz-&gt;hwCursor ? "HW" : "SW");
+    if (xf86IsOptionSet(pZzz-&gt;Options, OPTION_NOACCEL)) {
+        pZzz-&gt;noAccel = TRUE;
+        xf86DrvMsg(pScrn-&gt;scrnIndex, X_CONFIG,
+                   "Acceleration disabled\n");
+    } else {
+        pZzz-&gt;noAccel = FALSE;
+    }
+    if (xf86IsOptionSet(pZzz-&gt;Options, OPTION_PCI_RETRY)) {
+        pZzz-&gt;UsePCIRetry = TRUE;
+        xf86DrvMsg(pScrn-&gt;scrnIndex, X_CONFIG, "PCI retry enabled\n");
+    }
+    pZzz-&gt;fooHack = 0;
+    if (xf86GetOptValInteger(pZzz-&gt;Options, OPTION_FOO_HACK,
+                             &amp;pZzz-&gt;fooHack)) {
+        xf86DrvMsg(pScrn-&gt;scrnIndex, X_CONFIG, "Foo Hack set to %d\n",
+                   pZzz-&gt;fooHack);
+    }
+
+    /*
+     * Find the PCI slot(s) that this screen claimed in the probe.
+     * In this case, exactly one is expected, so complain otherwise.
+     * Note in this case we're not interested in the card types so
+     * that parameter is set to NULL.
+     */
+    if ((i = xf86GetPciInfoForScreen(pScrn-&gt;scrnIndex, &amp;pciList, NULL))
+        != 1) {
+        print error message;
+        ZZZFreeRec(pScrn);
+        if (i &gt; 0)
+            xfree(pciList);
+        return FALSE;
+    }
+    /* Note that pciList should be freed below when no longer needed */
+
+    /*
+     * Determine the chipset, allowing config file chipset and
+     * chipid values to override the probed information.  The config
+     * chipset value has precedence over its chipid value if both
+     * are present.
+     *
+     * It isn't necessary to fill in pScrn-&gt;chipset if the driver
+     * keeps track of the chipset in its ZZZRec.
+     */
+
+    ...
+
+    /*
+     * Determine video memory, fb base address, I/O addresses, etc,
+     * allowing the config file to override probed values.
+     *
+     * Set the appropriate pScrn fields (videoRam is probably the
+     * most important one that other code might require), and
+     * print out the settings.
+     */
+
+    ...
+
+    /* Initialise a clockRanges list. */
+
+    ...
+
+    /* Set any other chipset specific things in the ZZZRec */
+
+    ...
+
+    /* Select valid modes from those available */
+
+    i = xf86ValidateModes(pScrn, pScrn-&gt;monitor-&gt;Modes,
+                          pScrn-&gt;display-&gt;modes, clockRanges,
+                          NULL, minPitch, maxPitch, rounding,
+                          minHeight, maxHeight,
+                          pScrn-&gt;display-&gt;virtualX,
+                          pScrn-&gt;display-&gt;virtualY,
+                          pScrn-&gt;videoRam * 1024,
+                          LOOKUP_BEST_REFRESH);
+    if (i == -1) {
+        ZZZFreeRec(pScrn);
+        return FALSE;
+    }
+
+    /* Prune the modes marked as invalid */
+
+    xf86PruneDriverModes(pScrn);
+
+    /* If no valid modes, return */
+
+    if (i == 0 || pScrn-&gt;modes == NULL) {
+        print error message;
+        ZZZFreeRec(pScrn);
+        return FALSE;
+    }
+
+    /*
+     * Initialise the CRTC fields for the modes.  This driver expects
+     * vertical values to be halved for interlaced modes.
+     */
+    xf86SetCrtcForModes(pScrn, INTERLACE_HALVE_V);
+
+    /* Set the current mode to the first in the list. */
+    pScrn-&gt;currentMode = pScrn-&gt;modes;
+
+    /* Print the list of modes being used. */
+    xf86PrintModes(pScrn);
+
+    /* Set the DPI */
+    xf86SetDpi(pScrn, 0, 0);
+
+    /* Load bpp-specific modules */
+    switch (pScrn-&gt;bitsPerPixel) {
+    case 1:
+        mod = "xf1bpp";
+        break;
+    case 4:
+        mod = "xf4bpp";
+        break;
+    case 8:
+        mod = "cfb";
+        break;
+    case 16:
+        mod = "cfb16";
+        break;
+    case 24:
+        mod = "cfb24";
+        break;
+    case 32:
+        mod = "cfb32";
+        break;
+    }
+    if (mod &amp;&amp; !xf86LoadSubModule(pScrn, mod))
+        ZZZFreeRec(pScrn);
+        return FALSE;
+
+    /* Load XAA if needed */
+    if (!pZzz-&gt;noAccel || pZzz-&gt;hwCursor)
+        if (!xf86LoadSubModule(pScrn, "xaa")) {
+            ZZZFreeRec(pScrn);
+            return FALSE;
+        }
+
+    /* Done */
+    return TRUE;
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>MapMem, UnmapMem</title>
+
+	<para>
+    Define functions to map and unmap the video memory and any other
+    memory apertures required.  These functions are not mandatory, but
+    it is often useful to have such functions.
+	</para>
+
+	<programlisting>
+static Bool
+ZZZMapMem(ScrnInfoPtr pScrn)
+{
+    /* Call xf86MapPciMem() to map each PCI memory area */
+    ...
+    return TRUE or FALSE;
+}
+
+static Bool
+ZZZUnmapMem(ScrnInfoPtr pScrn)
+{
+    /* Call xf86UnMapVidMem() to unmap each memory area */
+    ...
+    return TRUE or FALSE;
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>Save, Restore</title>
+
+	<para>
+    Define functions to save and restore the original video state.  These
+    functions are not mandatory, but are often useful.
+	</para>
+
+	<programlisting>
+static void
+ZZZSave(ScrnInfoPtr pScrn)
+{
+    /*
+     * Save state into per-screen data structures.
+     * If using the vgahw module, vgaHWSave will typically be
+     * called here.
+     */
+    ...
+}
+
+static void
+ZZZRestore(ScrnInfoPtr pScrn)
+{
+    /*
+     * Restore state from per-screen data structures.
+     * If using the vgahw module, vgaHWRestore will typically be
+     * called here.
+     */
+    ...
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>ModeInit</title>
+
+	<para>
+    Define a function to initialise a new video mode.  This function isn't
+    mandatory, but is often useful.
+	</para>
+
+	<programlisting>
+static Bool
+ZZZModeInit(ScrnInfoPtr pScrn, DisplayModePtr mode)
+{
+    /*
+     * Program a video mode.  If using the vgahw module,
+     * vgaHWInit and vgaRestore will typically be called here.
+     * Once up to the point where there can't be a failure
+     * set pScrn-&gt;vtSema to TRUE.
+     */
+    ...
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>ScreenInit</title>
+
+	<para>
+    Define the <function>ScreenInit()</function> function.  This is called
+    at the start of each server generation, and should fill in as much
+    of the <structname>ScreenRec</structname> as possible as well as any other
+    data that is initialised once per generation.  It should initialise
+    the framebuffer layers it is using, and initialise the initial video
+    mode.
+	</para>
+
+	<para>
+    This function is mandatory.
+	</para>
+
+	<para>
+    NOTE: The <structname>ScreenRec</structname> (<parameter>pScreen</parameter>) is
+	  passed to this driver, but it and the
+	  <varname>ScrnInfoRecs</varname> are not yet hooked into each
+	  other.  This means that in this function, and functions it
+	  calls, one cannot be found from the other.
+	</para>
+
+	<programlisting>
+static Bool
+ZZZScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
+{
+    /* Get the ScrnInfoRec */
+    pScrn = xf86Screens[pScreen-&gt;myNum];
+
+    /*
+     * If using the vgahw module, its data structures and related
+     * things are typically initialised/mapped here.
+     */
+
+    /* Save the current video state */
+    ZZZSave(pScrn);
+
+    /* Initialise the first mode */
+    ZZZModeInit(pScrn, pScrn-&gt;currentMode);
+
+    /* Set the viewport if supported */
+
+    ZZZAdjustFrame(scrnIndex, pScrn-&gt;frameX0, pScrn-&gt;frameY0, 0);
+
+    /*
+     * Setup the screen's visuals, and initialise the framebuffer
+     * code.
+     */
+
+    /* Reset the visual list */
+    miClearVisualTypes();
+
+    /*
+     * Setup the visuals supported.  This driver only supports
+     * TrueColor for bpp &gt; 8, so the default set of visuals isn't
+     * acceptable.  To deal with this, call miSetVisualTypes with
+     * the appropriate visual mask.
+     */
+
+    if (pScrn-&gt;bitsPerPixel &gt; 8) {
+        if (!miSetVisualTypes(pScrn-&gt;depth, TrueColorMask,
+                              pScrn-&gt;rgbBits, pScrn-&gt;defaultVisual))
+            return FALSE;
+    } else {
+        if (!miSetVisualTypes(pScrn-&gt;depth,
+                              miGetDefaultVisualMask(pScrn-&gt;depth),
+                              pScrn-&gt;rgbBits, pScrn-&gt;defaultVisual))
+            return FALSE;
+    }
+
+    /*
+     * Initialise the framebuffer.
+     */
+
+    switch (pScrn-&gt;bitsPerPixel) {
+    case 1:
+        ret = xf1bppScreenInit(pScreen, FbBase,
+                               pScrn-&gt;virtualX, pScrn-&gt;virtualY,
+                               pScrn-&gt;xDpi, pScrn-&gt;yDpi,
+                               pScrn-&gt;displayWidth);
+        break;
+    case 4:
+        ret = xf4bppScreenInit(pScreen, FbBase,
+                               pScrn-&gt;virtualX, pScrn-&gt;virtualY,
+                               pScrn-&gt;xDpi, pScrn-&gt;yDpi,
+                               pScrn-&gt;displayWidth);
+        break;
+    case 8:
+        ret = cfbScreenInit(pScreen, FbBase,
+                            pScrn-&gt;virtualX, pScrn-&gt;virtualY,
+                            pScrn-&gt;xDpi, pScrn-&gt;yDpi,
+                            pScrn-&gt;displayWidth);
+        break;
+    case 16:
+        ret = cfb16ScreenInit(pScreen, FbBase,
+                              pScrn-&gt;virtualX, pScrn-&gt;virtualY,
+                              pScrn-&gt;xDpi, pScrn-&gt;yDpi,
+                              pScrn-&gt;displayWidth);
+        break;
+    case 24:
+        ret = cfb24ScreenInit(pScreen, FbBase,
+                              pScrn-&gt;virtualX, pScrn-&gt;virtualY,
+                              pScrn-&gt;xDpi, pScrn-&gt;yDpi,
+                              pScrn-&gt;displayWidth);
+        break;
+    case 32:
+        ret = cfb32ScreenInit(pScreen, FbBase,
+                              pScrn-&gt;virtualX, pScrn-&gt;virtualY,
+                              pScrn-&gt;xDpi, pScrn-&gt;yDpi,
+                              pScrn-&gt;displayWidth);
+        break;
+    default:
+        print a message about an internal error;
+        ret = FALSE;
+        break;
+    }
+
+    if (!ret)
+        return FALSE;
+
+    /* Override the default mask/offset settings */
+    if (pScrn-&gt;bitsPerPixel &gt; 8) {
+        for (i = 0, visual = pScreen-&gt;visuals;
+             i &lt; pScreen-&gt;numVisuals; i++, visual++) {
+            if ((visual-&gt;class | DynamicClass) == DirectColor) {
+                visual-&gt;offsetRed = pScrn-&gt;offset.red;
+                visual-&gt;offsetGreen = pScrn-&gt;offset.green;
+                visual-&gt;offsetBlue = pScrn-&gt;offset.blue;
+                visual-&gt;redMask = pScrn-&gt;mask.red;
+                visual-&gt;greenMask = pScrn-&gt;mask.green;
+                visual-&gt;blueMask = pScrn-&gt;mask.blue;
+            }
+        }
+    }
+
+    /*
+     * If banking is needed, initialise an miBankInfoRec (defined in
+     * "mibank.h"), and call miInitializeBanking().
+     */
+    if (!miInitializeBanking(pScreen, pScrn-&gt;virtualX, pScrn-&gt;virtualY,
+                                     pScrn-&gt;displayWidth, pBankInfo))
+        return FALSE;
+
+    /*
+     * If backing store is to be supported (as is usually the case),
+     * initialise it.
+     */
+    miInitializeBackingStore(pScreen);
+
+    /*
+     * Set initial black &amp; white colourmap indices.
+     */
+    xf86SetBlackWhitePixels(pScreen);
+
+    /*
+     * Install colourmap functions.  If using the vgahw module,
+     * vgaHandleColormaps would usually be called here.
+     */
+
+    ...
+
+    /*
+     * Initialise cursor functions.  This example is for the mi
+     * software cursor.
+     */
+    miDCInitialize(pScreen, xf86GetPointerScreenFuncs());
+
+    /* Initialise the default colourmap */
+    switch (pScrn-&gt;depth) {
+    case 1:
+        if (!xf1bppCreateDefColormap(pScreen))
+            return FALSE;
+        break;
+    case 4:
+        if (!xf4bppCreateDefColormap(pScreen))
+            return FALSE;
+        break;
+    default:
+        if (!cfbCreateDefColormap(pScreen))
+            return FALSE;
+        break;
+    }
+
+    /*
+     * Wrap the CloseScreen vector and set SaveScreen.
+     */
+    ZZZPTR(pScrn)-&gt;CloseScreen = pScreen-&gt;CloseScreen;
+    pScreen-&gt;CloseScreen = ZZZCloseScreen;
+    pScreen-&gt;SaveScreen = ZZZSaveScreen;
+
+    /* Report any unused options (only for the first generation) */
+    if (serverGeneration == 1) {
+        xf86ShowUnusedOptions(pScrn-&gt;scrnIndex, pScrn-&gt;options);
+    }
+
+    /* Done */
+    return TRUE;
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>SwitchMode</title>
+
+	<para>
+    Define the <function>SwitchMode()</function> function if mode switching
+    is supported by the driver.
+	</para>
+
+	<programlisting>
+static Bool
+ZZZSwitchMode(int scrnIndex, DisplayModePtr mode, int flags)
+{
+    return ZZZModeInit(xf86Screens[scrnIndex], mode);
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>AdjustFrame</title>
+
+	<para>
+    Define the <function>AdjustFrame()</function> function if the driver
+    supports this.
+	</para>
+
+	<programlisting>
+static void
+ZZZAdjustFrame(int scrnIndex, int x, int y, int flags)
+{
+    /* Adjust the viewport */
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>EnterVT, LeaveVT</title>
+
+	<para>
+    Define the <function>EnterVT()</function> and <function>LeaveVT()</function>
+    functions.
+	</para>
+
+	<para>
+    These functions are mandatory.
+	</para>
+
+	<programlisting>
+static Bool
+ZZZEnterVT(int scrnIndex, int flags)
+{
+    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
+    return ZZZModeInit(pScrn, pScrn-&gt;currentMode);
+}
+
+static void
+ZZZLeaveVT(int scrnIndex, int flags)
+{
+    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
+    ZZZRestore(pScrn);
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>CloseScreen</title>
+
+	<para>
+    Define the <function>CloseScreen()</function> function:
+	</para>
+
+	<para>
+    This function is mandatory.  Note that it unwraps the previously
+    wrapped <structfield>pScreen-&gt;CloseScreen</structfield>, and finishes by
+    calling it.
+	</para>
+
+	<programlisting>
+static Bool
+ZZZCloseScreen(int scrnIndex, ScreenPtr pScreen)
+{
+    ScrnInfoPtr pScrn = xf86Screens[scrnIndex];
+    if (pScrn-&gt;vtSema) {
+        ZZZRestore(pScrn);
+        ZZZUnmapMem(pScrn);
+    }
+    pScrn-&gt;vtSema = FALSE;
+    pScreen-&gt;CloseScreen = ZZZPTR(pScrn)-&gt;CloseScreen;
+    return (*pScreen-&gt;CloseScreen)(scrnIndex, pScreen);
+}
+	</programlisting>
+      </sect3>
+
+      <sect3>
+	<title>SaveScreen</title>
+
+	<para>
+    Define the <function>SaveScreen()</function> function (the screen
+    blanking function).  When using the vgahw module, this will typically
+    be:
+
+	  <programlisting>
+static Bool
+ZZZSaveScreen(ScreenPtr pScreen, int mode)
+{
+    return vgaHWSaveScreen(pScreen, mode);
+}
+	  </programlisting>
+	</para>
+
+	<para>
+    This function is mandatory.  Before modifying any hardware register
+    directly this function needs to make sure that the Xserver is active
+    by checking if <parameter>pScrn</parameter> is non-NULL and for
+    <literal remap="tt">pScrn-&gt;vtSema == TRUE</literal>.
+	</para>
+      </sect3>
+
+      <sect3>
+	<title>FreeScreen</title>
+
+	<para>
+    Define the <function>FreeScreen()</function> function.  This function
+    is optional.  It should be defined if the <structname>ScrnInfoRec</structname>
+    <structfield>driverPrivate</structfield> field is used so that it can be freed
+    when a screen is deleted by the common layer for reasons possibly
+    beyond the driver's control.  This function is not used in during
+    normal (error free) operation.  The per-generation data is freed by
+    the <function>CloseScreen()</function> function.
+	</para>
+
+	<programlisting>
+static void
+ZZZFreeScreen(int scrnIndex, int flags)
+{
+    /*
+     * If the vgahw module is used vgaHWFreeHWRec() would be called
+     * here.
+     */
+    ZZZFreeRec(xf86Screens[scrnIndex]);
+}
+
+	</programlisting>
+
+      </sect3>
+
+    </sect2>
+
+  </sect1>
+
+</article>
diff --git a/xorg-server/hw/xfree86/doc/devel/Makefile.am b/xorg-server/hw/xfree86/doc/devel/Makefile.am
deleted file mode 100644
index c9eca5eb3..000000000
--- a/xorg-server/hw/xfree86/doc/devel/Makefile.am
+++ /dev/null
@@ -1,7 +0,0 @@
-# Documentation for developers that is distributed with the source but
-# not installed on the system for end-users
-
-EXTRA_DIST = \
-	Registry \
-	exa-driver.txt \
-	README.DRIcomp
diff --git a/xorg-server/hw/xfree86/doc/devel/exa-driver.txt b/xorg-server/hw/xfree86/doc/exa-driver.txt
index 048307ee7..048307ee7 100644
--- a/xorg-server/hw/xfree86/doc/devel/exa-driver.txt
+++ b/xorg-server/hw/xfree86/doc/exa-driver.txt
diff --git a/xorg-server/hw/xfree86/dri2/dri2.c b/xorg-server/hw/xfree86/dri2/dri2.c
index 5c42a51df..bf7ebb9f8 100644
--- a/xorg-server/hw/xfree86/dri2/dri2.c
+++ b/xorg-server/hw/xfree86/dri2/dri2.c
@@ -83,6 +83,7 @@ typedef struct _DRI2Drawable {
     CARD64		 last_swap_ust; /* ust at completion of most recent swap */
     int			 swap_limit; /* for N-buffering */
     unsigned long	 serialNumber;
+    Bool		 needInvalidate;
 } DRI2DrawableRec, *DRI2DrawablePtr;
 
 typedef struct _DRI2Screen {
@@ -497,6 +498,8 @@ do_get_buffers(DrawablePtr pDraw, int *width, int *height,
 		       DRI2BufferFrontLeft);
     }
 
+    pPriv->needInvalidate = TRUE;
+
     return pPriv->buffers;
 
 err_out:
@@ -540,9 +543,11 @@ DRI2InvalidateDrawable(DrawablePtr pDraw)
     DRI2DrawablePtr pPriv = DRI2GetDrawable(pDraw);
     DRI2DrawableRefPtr ref;
 
-    if (!pPriv)
+    if (!pPriv || !pPriv->needInvalidate)
         return;
 
+    pPriv->needInvalidate = FALSE;
+
     list_for_each_entry(ref, &pPriv->reference_list, link)
 	ref->invalidate(pDraw, ref->priv);
 }
diff --git a/xorg-server/hw/xnest/Events.c b/xorg-server/hw/xnest/Events.c
index 5c800860a..619427ded 100644
--- a/xorg-server/hw/xnest/Events.c
+++ b/xorg-server/hw/xnest/Events.c
@@ -43,8 +43,6 @@ is" without express or implied warranty.
 
 CARD32 lastEventTime = 0;
 
-extern EventList *xnestEvents;
-
 void
 ProcessInputEvents(void)
 {
@@ -104,23 +102,17 @@ xnestCollectExposures(void)
 void
 xnestQueueKeyEvent(int type, unsigned int keycode)
 {
-  int i, n;
-
-  GetEventList(&xnestEvents);
   lastEventTime = GetTimeInMillis();
-  n = GetKeyboardEvents(xnestEvents, xnestKeyboardDevice, type, keycode, NULL);
-  for (i = 0; i < n; i++)
-    mieqEnqueue(xnestKeyboardDevice, (InternalEvent*)(xnestEvents + i)->event);
+  QueueKeyboardEvents(xnestKeyboardDevice, type, keycode, NULL);
 }
 
 void
 xnestCollectEvents(void)
 {
   XEvent X;
-  int i, n, valuators[2];
+  int valuators[2];
   ValuatorMask mask;
   ScreenPtr pScreen;
-  GetEventList(&xnestEvents);
 
   while (XCheckIfEvent(xnestDisplay, &X, xnestNotExposurePredicate, NULL)) {
     switch (X.type) {
@@ -138,20 +130,16 @@ xnestCollectEvents(void)
       valuator_mask_set_range(&mask, 0, 0, NULL);
       xnestUpdateModifierState(X.xkey.state);
       lastEventTime = GetTimeInMillis();
-      n = GetPointerEvents(xnestEvents, xnestPointerDevice, ButtonPress,
-                           X.xbutton.button, POINTER_RELATIVE, &mask);
-      for (i = 0; i < n; i++)
-        mieqEnqueue(xnestPointerDevice, (InternalEvent*)(xnestEvents + i)->event);
+      QueuePointerEvents(xnestPointerDevice, ButtonPress,
+                         X.xbutton.button, POINTER_RELATIVE, &mask);
       break;
       
     case ButtonRelease:
       valuator_mask_set_range(&mask, 0, 0, NULL);
       xnestUpdateModifierState(X.xkey.state);
       lastEventTime = GetTimeInMillis();
-      n = GetPointerEvents(xnestEvents, xnestPointerDevice, ButtonRelease,
-                           X.xbutton.button, POINTER_RELATIVE, &mask);
-      for (i = 0; i < n; i++)
-        mieqEnqueue(xnestPointerDevice, (InternalEvent*)(xnestEvents + i)->event);
+      QueuePointerEvents(xnestPointerDevice, ButtonRelease,
+                         X.xbutton.button, POINTER_RELATIVE, &mask);
       break;
       
     case MotionNotify:
@@ -159,10 +147,8 @@ xnestCollectEvents(void)
       valuators[1] = X.xmotion.y;
       valuator_mask_set_range(&mask, 0, 2, valuators);
       lastEventTime = GetTimeInMillis();
-      n = GetPointerEvents(xnestEvents, xnestPointerDevice, MotionNotify,
-                           0, POINTER_ABSOLUTE, &mask);
-      for (i = 0; i < n; i++)
-        mieqEnqueue(xnestPointerDevice, (InternalEvent*)(xnestEvents + i)->event);
+      QueuePointerEvents(xnestPointerDevice, MotionNotify,
+                         0, POINTER_ABSOLUTE, &mask);
       break;
       
     case FocusIn:
@@ -193,10 +179,8 @@ xnestCollectEvents(void)
           valuators[1] = X.xcrossing.y;
           valuator_mask_set_range(&mask, 0, 2, valuators);
           lastEventTime = GetTimeInMillis();
-          n = GetPointerEvents(xnestEvents, xnestPointerDevice, MotionNotify,
-                               0, POINTER_ABSOLUTE, &mask);
-          for (i = 0; i < n; i++)
-            mieqEnqueue(xnestPointerDevice, (InternalEvent*)(xnestEvents + i)->event);
+          QueuePointerEvents(xnestPointerDevice, MotionNotify,
+                             0, POINTER_ABSOLUTE, &mask);
 	  xnestDirectInstallColormaps(pScreen);
 	}
       }
diff --git a/xorg-server/hw/xnest/Init.c b/xorg-server/hw/xnest/Init.c
index 8a90cc65e..ee74101d2 100644
--- a/xorg-server/hw/xnest/Init.c
+++ b/xorg-server/hw/xnest/Init.c
@@ -45,8 +45,6 @@ is" without express or implied warranty.
 
 Bool xnestDoFullGeneration = True;
 
-EventList *xnestEvents = NULL;
-
 void
 InitOutput(ScreenInfo *screenInfo, int argc, char *argv[])
 {
@@ -100,8 +98,6 @@ InitInput(int argc, char *argv[])
   if (rc != Success)
       FatalError("Failed to init Xnest default devices.\n");
 
-  GetEventList(&xnestEvents);
-
   mieqInit();
 
   AddEnabledDevice(XConnectionNumber(xnestDisplay));
diff --git a/xorg-server/hw/xquartz/Makefile.am b/xorg-server/hw/xquartz/Makefile.am
index 76f624d78..a7cc012d9 100644
--- a/xorg-server/hw/xquartz/Makefile.am
+++ b/xorg-server/hw/xquartz/Makefile.am
@@ -33,7 +33,8 @@ libXquartz_la_SOURCES = \
 	quartzCocoa.m \
 	quartzKeyboard.c \
 	quartzStartup.c \
-	quartzRandR.c
+	quartzRandR.c \
+	console_redirect.c
 
 EXTRA_DIST = \
 	X11Application.h \
@@ -49,4 +50,5 @@ EXTRA_DIST = \
 	quartzKeyboard.h \
 	quartzRandR.h \
 	sanitizedCarbon.h \
-	sanitizedCocoa.h
+	sanitizedCocoa.h \
+	console_redirect.h
diff --git a/xorg-server/hw/xquartz/X11Application.h b/xorg-server/hw/xquartz/X11Application.h
index 256ff187a..619f32f7a 100644
--- a/xorg-server/hw/xquartz/X11Application.h
+++ b/xorg-server/hw/xquartz/X11Application.h
@@ -43,11 +43,12 @@
 - (void) set_controller:controller;
 - (void) set_window_menu:(NSArray *)list;
 
+- (CFPropertyListRef) prefs_get_copy:(NSString *)key CF_RETURNS_RETAINED;
 - (int) prefs_get_integer:(NSString *)key default:(int)def;
 - (const char *) prefs_get_string:(NSString *)key default:(const char *)def;
 - (float) prefs_get_float:(NSString *)key default:(float)def;
 - (int) prefs_get_boolean:(NSString *)key default:(int)def;
-- (NSURL *) prefs_copy_url:(NSString *)key default:(NSURL *)def;
+- (NSURL *) prefs_copy_url:(NSString *)key default:(NSURL *)def NS_RETURNS_RETAINED;
 - (NSArray *) prefs_get_array:(NSString *)key;
 - (void) prefs_set_integer:(NSString *)key value:(int)value;
 - (void) prefs_set_float:(NSString *)key value:(float)value;
diff --git a/xorg-server/hw/xquartz/applewmExt.h b/xorg-server/hw/xquartz/applewmExt.h
index 35c8f8f6d..c46a7bde4 100644
--- a/xorg-server/hw/xquartz/applewmExt.h
+++ b/xorg-server/hw/xquartz/applewmExt.h
@@ -35,9 +35,9 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <Xplugin.h>
 
 #if XPLUGIN_VERSION < 4
-typedef xp_frame_attr int;
-typedef xp_frame_class int;
-typedef xp_frame_rect int;
+typedef int xp_frame_attr;
+typedef int xp_frame_class;
+typedef int xp_frame_rect;
 #endif
 
 typedef int (*DisableUpdateProc)(void);
diff --git a/xorg-server/hw/xquartz/console_redirect.c b/xorg-server/hw/xquartz/console_redirect.c
new file mode 100644
index 000000000..cdd2b8960
--- /dev/null
+++ b/xorg-server/hw/xquartz/console_redirect.c
@@ -0,0 +1,418 @@
+/* Copyright (c) 2011 Apple Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT
+ * HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name(s) of the above
+ * copyright holders shall not be used in advertising or otherwise to
+ * promote the sale, use or other dealings in this Software without
+ * prior written authorization.
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#else
+#define DEBUG_CONSOLE_REDIRECT 1
+#define HAVE_LIBDISPATCH 1
+#endif
+
+#include <assert.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/event.h>
+#include <asl.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include "console_redirect.h"
+
+#define BUF_SIZE 512
+
+#ifdef HAVE_LIBDISPATCH
+#include <dispatch/dispatch.h>
+
+static dispatch_queue_t redirect_serial_q;
+static dispatch_group_t read_source_group;
+#else
+#include <pthread.h>
+
+static pthread_t redirect_pthread;
+static pthread_mutex_t redirect_fds_lock = PTHREAD_MUTEX_INITIALIZER;
+
+static int kq;
+
+/* Notifications to our reader thread */
+#define ASL_REDIRECT_TERMINATE ((void *)(uintptr_t)1)
+#endif
+
+typedef struct {
+    int level;
+    aslclient asl;
+    aslmsg msg;
+
+    /* Buffered reading */
+    char *buf;
+    char *w;
+
+#ifdef HAVE_LIBDISPATCH
+    dispatch_source_t read_source;
+#endif
+} asl_redirect;
+
+static asl_redirect *redirect_fds = NULL;
+static int n_redirect_fds = 0;
+
+/* Read from the FD until there is no more to read and redirect to ASL.
+ * Preconditions:
+ *      1: pthread_mutex_lock lock is held (pthreads) or called
+ *         from the appropriate serial queue for operating on
+ *         redirect_fds
+ *      2: fd corresponds to a valid entry in redirect_fds
+ *
+ * Return values:
+ *      If the pipe is closed, EOF is returned regardless of how many bytes
+ *      were processed.  If the pipe is still open, the number of read bytes
+ *      is returned.
+ */
+static inline int _read_redirect(int fd, int flush) {
+    int total_read = 0;
+    int nbytes;
+    asl_redirect *aslr = &redirect_fds[fd];
+
+    while((nbytes = read(fd, aslr->w, BUF_SIZE - (aslr->w - aslr->buf) - 1)) > 0) {
+        char *s, *p;
+
+        /* Increment our returned number read */
+        total_read += nbytes;
+
+        nbytes += (aslr->w - aslr->buf);
+        aslr->buf[nbytes] = '\0';
+
+        /* One line at a time */
+        for(p=aslr->buf; *p && (p - aslr->buf) < nbytes; p = s + 1) {
+            // Find null or \n
+            for(s=p; *s && *s != '\n'; s++);
+            if(*s == '\n') {
+                *s='\0';
+                asl_log(aslr->asl, aslr->msg, aslr->level, "%s", p);
+            } else if(aslr->buf != p) {
+                memmove(aslr->buf, p, BUF_SIZE);
+                aslr->w = aslr->buf + (s - p);
+                break;
+            } else if(nbytes == BUF_SIZE - 1) {
+                asl_log(aslr->asl, aslr->msg, aslr->level, "%s", p);
+                aslr->w = aslr->buf;
+                break;
+            }
+        }
+    }
+
+    /* Flush if requested or we're at EOF */
+    if(flush || nbytes == 0) {
+        if(aslr->w > aslr->buf) {
+            *aslr->w = '\0';
+            asl_log(aslr->asl, aslr->msg, aslr->level, "%s", aslr->buf);
+        }
+    }
+
+    if(nbytes == 0)
+        return EOF;
+    return total_read;
+}
+
+#ifdef HAVE_LIBDISPATCH
+static void read_from_source(void *_source) {
+    dispatch_source_t source = (dispatch_source_t)_source;
+    int fd = dispatch_source_get_handle(source);
+    if(_read_redirect(fd, 0) == EOF) {
+        dispatch_source_cancel(source);
+    }
+}
+
+static void cancel_source(void *_source) {
+    dispatch_source_t source = (dispatch_source_t)_source;
+    int fd = dispatch_source_get_handle(source);
+    asl_redirect *aslr = &redirect_fds[fd];
+
+    /* Flush the buffer */
+    _read_redirect(fd, 1);
+
+    close(fd);
+    free(aslr->buf);
+    memset(aslr, 0, sizeof(*aslr));
+    dispatch_release(source);
+    dispatch_group_leave(read_source_group);
+}
+
+#else /* !HAVE_LIBDISPATCH */
+static void *redirect_thread(void *ctx __unused) {
+    struct kevent ev;
+    int n;
+
+    while(1) {
+        n = kevent(kq, NULL, 0, &ev, 1, NULL);
+
+        /* Bail on errors */
+        if(n < 0) {
+            asl_log(NULL, NULL, ASL_LEVEL_ERR, "kevent failure: %s", strerror(errno));
+            break;
+        }
+        
+        /* This should not happen */
+        if(n == 0)
+            continue;
+
+        switch(ev.filter) {
+            case EVFILT_READ:
+                pthread_mutex_lock(&redirect_fds_lock);
+                {
+                    int fd = ev.ident;
+                    int close_fd = 0;
+                    asl_redirect *aslr = &redirect_fds[fd];
+
+                    if(fd < 0 || fd >= n_redirect_fds || aslr->buf == NULL) {
+                        asl_log(NULL, NULL, ASL_LEVEL_ERR, "Unexpected file descriptor: %d", fd);
+                        goto next;
+                    }
+
+                    if(ev.flags & EV_EOF) {
+                        close_fd = 1;
+                        if(EOF != _read_redirect(fd, 1)) {
+                            asl_log(NULL, NULL, ASL_LEVEL_ERR, "kevent reported EOF on %d, but read doesn't concur.", fd);
+                        }
+                    } else {
+                        close_fd = (EOF == _read_redirect(fd, 0));
+                    }
+                    
+                    if(close_fd) {
+                        EV_SET(&ev, fd, EVFILT_READ, EV_DELETE, 0, 0, 0);
+                        kevent(kq, &ev, 1, NULL, 0, NULL);
+                        close(fd);
+                        free(aslr->buf);
+                        memset(aslr, 0, sizeof(*aslr));
+                    }
+                }
+                next:
+                pthread_mutex_unlock(&redirect_fds_lock);
+
+            case EVFILT_TIMER:
+                if(ev.udata == ASL_REDIRECT_TERMINATE)
+                    return NULL;
+
+            default:
+                ;;
+        }
+    }
+
+    return NULL;
+}
+#endif
+
+static void redirect_atexit(void) {
+    /* stdout is linebuffered, so flush the buffer */
+    if(redirect_fds[STDOUT_FILENO].buf)
+        fflush(stdout);
+
+#ifdef HAVE_LIBDISPATCH
+    {
+        int i;
+
+        /* Cancel all of our dispatch sources, so they flush to ASL */
+        for(i=0; i < n_redirect_fds; i++)
+            if(redirect_fds[i].read_source)
+                dispatch_source_cancel(redirect_fds[i].read_source);
+
+        /* Wait at least three seconds for our sources to flush to ASL */
+        dispatch_group_wait(read_source_group, dispatch_time(DISPATCH_TIME_NOW, 3LL * NSEC_PER_SEC));
+    }
+#else
+    {
+        struct kevent ev;
+
+        /* Tell our reader thread it is time to pack up and go home */
+        EV_SET(&ev, 0, EVFILT_TIMER, EV_ADD | EV_ONESHOT, 0, 0, ASL_REDIRECT_TERMINATE);
+        kevent(kq, &ev, 1, NULL, 0, NULL);
+    
+        pthread_join(redirect_pthread, NULL);
+    }
+#endif
+}
+
+#ifdef HAVE_LIBDISPATCH
+static void xq_asl_init(void *ctx __unused)
+#else
+static void xq_asl_init(void)
+#endif
+{
+    assert((redirect_fds = calloc(16, sizeof(*redirect_fds))) != NULL);
+    n_redirect_fds = 16;
+
+#ifdef HAVE_LIBDISPATCH
+    redirect_serial_q = dispatch_queue_create("com.apple.asl-redirect", NULL);
+    assert(redirect_serial_q != NULL);
+
+    read_source_group = dispatch_group_create();
+    assert(read_source_group != NULL);
+#else
+    assert((kq = kqueue()) != -1);
+    assert(pthread_create(&redirect_pthread, NULL, redirect_thread, NULL) == 0);
+#endif
+
+    atexit(redirect_atexit);
+}
+
+int xq_asl_log_fd(aslclient asl, aslmsg msg, int level, int fd) {
+#ifdef HAVE_LIBDISPATCH
+    int err __block = 0;
+    static dispatch_once_t once_control;
+    dispatch_once_f(&once_control, NULL, xq_asl_init);
+#else
+    int err = 0;
+    static pthread_once_t once_control = PTHREAD_ONCE_INIT;
+    assert(pthread_once(&once_control, xq_asl_init) == 0);
+#endif
+    
+    if(fd < 0)
+        return EBADF;
+    
+#ifdef HAVE_LIBDISPATCH
+#define BLOCK_DONE return
+    dispatch_sync(redirect_serial_q, ^
+#else
+#define BLOCK_DONE goto done
+    assert(pthread_mutex_lock(&redirect_fds_lock) == 0);
+#endif
+    {
+        /* Reallocate if we need more space */
+        if(fd >= n_redirect_fds) {
+            size_t new_n = 1 << (ffs(fd) + 1);
+            asl_redirect *new_array = realloc(redirect_fds, new_n * sizeof(*redirect_fds));
+            if(!new_array) {
+                err = errno;
+                BLOCK_DONE;
+            }
+            redirect_fds = new_array;
+            memset(redirect_fds + n_redirect_fds, 0, new_n - n_redirect_fds);
+            n_redirect_fds = new_n;
+        }
+        
+        /* If we're already listening on it, return error. */
+        if(redirect_fds[fd].buf != NULL) {
+            err = EBADF;
+            BLOCK_DONE;
+        }
+        
+        /* Initialize our buffer */
+        redirect_fds[fd].buf = (char *)malloc(BUF_SIZE);
+        if(redirect_fds[fd].buf == NULL) {
+            err = errno;
+            BLOCK_DONE;
+        }
+        redirect_fds[fd].w = redirect_fds[fd].buf;
+        
+        /* Store our ASL settings */
+        redirect_fds[fd].level = level;
+        redirect_fds[fd].asl = asl;
+        redirect_fds[fd].msg = msg;
+        
+        /* Don't block on reads from this fd */
+        fcntl(fd, F_SETFL, O_NONBLOCK);
+        
+        /* Start listening */
+#ifdef HAVE_LIBDISPATCH
+        {
+            dispatch_source_t read_source = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ, fd, 0, redirect_serial_q);
+            redirect_fds[fd].read_source = read_source;
+            dispatch_set_context(read_source, read_source);
+            dispatch_source_set_event_handler_f(read_source, read_from_source);
+            dispatch_source_set_cancel_handler_f(read_source, cancel_source);
+            dispatch_group_enter(read_source_group);
+            dispatch_resume(read_source);
+        }
+#else
+        {
+            struct kevent ev;
+            EV_SET(&ev, fd, EVFILT_READ, EV_ADD, 0, 0, 0);
+            kevent(kq, &ev, 1, NULL, 0, NULL);
+        }
+#endif
+    }
+#ifdef HAVE_LIBDISPATCH
+    );
+#else
+done:
+    assert(pthread_mutex_unlock(&redirect_fds_lock) == 0);
+#endif
+#undef BLOCK_DONE
+    
+    return err;
+}
+
+int xq_asl_capture_fd(aslclient asl, aslmsg msg, int level, int fd) {
+    int pipepair[2];
+    
+    /* Create pipe */
+    if(pipe(pipepair) == -1)
+        return errno;
+    
+    /* Close the read fd but not the write fd on exec */
+    if(fcntl(pipepair[0], F_SETFD, FD_CLOEXEC) == -1)
+        return errno;
+
+    /* Replace the existing fd */
+    if(dup2(pipepair[1], fd) == -1) {
+        close(pipepair[0]);
+        close(pipepair[1]);
+        return errno;
+    }
+
+    /* If we capture STDOUT_FILENO, make sure we linebuffer stdout */
+    if(fd == STDOUT_FILENO)
+        setlinebuf(stdout);
+    
+    /* Close the duplicate fds since they've been reassigned */
+    close(pipepair[1]);
+
+    /* Hand off the read end of our pipe to xq_asl_log_fd */
+    return xq_asl_log_fd(asl, msg, level, pipepair[0]);
+}
+
+#ifdef DEBUG_CONSOLE_REDIRECT
+int main(int argc __unused, char **argv __unused) {
+    xq_asl_capture_fd(NULL, NULL, ASL_LEVEL_NOTICE, STDOUT_FILENO);
+    xq_asl_capture_fd(NULL, NULL, ASL_LEVEL_ERR, STDERR_FILENO);
+
+    fprintf(stderr, "TEST ERR1\n");
+    fprintf(stdout, "TEST OUT1\n");
+    fprintf(stderr, "TEST ERR2\n");
+    fprintf(stdout, "TEST OUT2\n");
+    system("/bin/echo SYST OUT");
+    system("/bin/echo SYST ERR >&2");
+    fprintf(stdout, "TEST OUT3\n");
+    fprintf(stdout, "TEST OUT4\n");
+    fprintf(stderr, "TEST ERR3\n");
+    fprintf(stderr, "TEST ERR4\n");
+
+    exit(0);
+}
+#endif
diff --git a/xorg-server/hw/xquartz/console_redirect.h b/xorg-server/hw/xquartz/console_redirect.h
new file mode 100644
index 000000000..94520a35c
--- /dev/null
+++ b/xorg-server/hw/xquartz/console_redirect.h
@@ -0,0 +1,44 @@
+/* Copyright (c) 2011 Apple Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT
+ * HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name(s) of the above
+ * copyright holders shall not be used in advertising or otherwise to
+ * promote the sale, use or other dealings in this Software without
+ * prior written authorization.
+ */
+
+#ifndef _XQUARTZ_CONSOLE_REDIRECT_H_
+#define _XQUARTZ_CONSOLE_REDIRECT_H_
+
+#include <asl.h>
+
+/* The given fd is replaced with a pipe.  Anything written to it will will be
+ * logged to ASL.
+ */
+int xq_asl_capture_fd(aslclient asl, aslmsg msg, int level, int fd);
+
+/* The given fd is read from and passed along to ASL until all write ends of the
+ * pipe are closed. Once the last writer has closed the pipe, we close our end.
+ */
+int xq_asl_log_fd(aslclient asl, aslmsg msg, int level, int fd);
+
+#endif
diff --git a/xorg-server/hw/xquartz/darwinEvents.c b/xorg-server/hw/xquartz/darwinEvents.c
index f3e12250e..fe744b741 100644
--- a/xorg-server/hw/xquartz/darwinEvents.c
+++ b/xorg-server/hw/xquartz/darwinEvents.c
@@ -88,7 +88,7 @@ static pthread_mutex_t fd_add_lock = PTHREAD_MUTEX_INITIALIZER;
 static pthread_cond_t fd_add_ready_cond = PTHREAD_COND_INITIALIZER;
 static pthread_t fd_add_tid = NULL;
 
-static EventListPtr darwinEvents = NULL;
+static InternalEvent* darwinEvents = NULL;
 
 static pthread_mutex_t mieq_lock = PTHREAD_MUTEX_INITIALIZER;
 static pthread_cond_t mieq_ready_cond = PTHREAD_COND_INITIALIZER;
@@ -433,7 +433,6 @@ static void DarwinPrepareValuators(DeviceIntPtr pDev, int *valuators, ScreenPtr
 void DarwinSendPointerEvents(DeviceIntPtr pDev, int ev_type, int ev_button, float pointer_x, float pointer_y, 
 			     float pressure, float tilt_x, float tilt_y) {
 	static int darwinFakeMouseButtonDown = 0;
-	int i, num_events;
     ScreenPtr screen;
     int valuators[5];
 	
@@ -486,15 +485,12 @@ void DarwinSendPointerEvents(DeviceIntPtr pDev, int ev_type, int ev_button, floa
     darwinEvents_lock(); {
         ValuatorMask mask;
         valuator_mask_set_range(&mask, 0, (pDev == darwinPointer) ? 2 : 5, valuators);
-        num_events = GetPointerEvents(darwinEvents, pDev, ev_type, ev_button, 
-                                      POINTER_ABSOLUTE, &mask);
-        for(i=0; i<num_events; i++) mieqEnqueue (pDev, (InternalEvent*)darwinEvents[i].event);
-        if(num_events > 0) DarwinPokeEQ();
+        QueuePointerEvents(pDev, ev_type, ev_button, POINTER_ABSOLUTE, &mask);
+        DarwinPokeEQ();
     } darwinEvents_unlock();
 }
 
 void DarwinSendKeyboardEvents(int ev_type, int keycode) {
-	int i, num_events;
 
 	if(!darwinEvents) {
 		DEBUG_LOG("DarwinSendKeyboardEvents called before darwinEvents was initialized\n");
@@ -502,15 +498,13 @@ void DarwinSendKeyboardEvents(int ev_type, int keycode) {
 	}
 
     darwinEvents_lock(); {
-        num_events = GetKeyboardEvents(darwinEvents, darwinKeyboard, ev_type, keycode + MIN_KEYCODE, NULL);
-        for(i=0; i<num_events; i++) mieqEnqueue(darwinKeyboard, (InternalEvent*)darwinEvents[i].event);
-        if(num_events > 0) DarwinPokeEQ();
+        QueueKeyboardEvents(darwinKeyboard, ev_type, keycode + MIN_KEYCODE, NULL);
+        DarwinPokeEQ();
     } darwinEvents_unlock();
 }
 
 void DarwinSendProximityEvents(DeviceIntPtr pDev, int ev_type, float pointer_x, float pointer_y,  
                                float pressure, float tilt_x, float tilt_y) {
-    int i, num_events;
     ScreenPtr screen;
     int valuators[5];
 
@@ -531,9 +525,8 @@ void DarwinSendProximityEvents(DeviceIntPtr pDev, int ev_type, float pointer_x,
     darwinEvents_lock(); {
         ValuatorMask mask;
         valuator_mask_set_range(&mask, 0, 5, valuators);
-        num_events = GetProximityEvents(darwinEvents, pDev, ev_type, &mask);
-        for(i=0; i<num_events; i++) mieqEnqueue (pDev, (InternalEvent*)darwinEvents[i].event);
-        if(num_events > 0) DarwinPokeEQ();
+        QueueProximityEvents(pDev, ev_type, &mask);
+        DarwinPokeEQ();
     } darwinEvents_unlock();
 }
 
diff --git a/xorg-server/hw/xquartz/mach-startup/Makefile.am b/xorg-server/hw/xquartz/mach-startup/Makefile.am
index 4dff45aa8..1ce54ad86 100644
--- a/xorg-server/hw/xquartz/mach-startup/Makefile.am
+++ b/xorg-server/hw/xquartz/mach-startup/Makefile.am
@@ -1,4 +1,5 @@
 AM_CPPFLAGS = \
+	-I$(srcdir)/.. \
 	-DBUILD_DATE=\"$(BUILD_DATE)\" \
 	-DXSERVER_VERSION=\"$(VERSION)\" \
 	-DX11BINDIR=\"$(bindir)\"
diff --git a/xorg-server/hw/xquartz/mach-startup/bundle-main.c b/xorg-server/hw/xquartz/mach-startup/bundle-main.c
index 846025b44..8e3437644 100644
--- a/xorg-server/hw/xquartz/mach-startup/bundle-main.c
+++ b/xorg-server/hw/xquartz/mach-startup/bundle-main.c
@@ -36,6 +36,7 @@
 #endif
 
 #include <X11/Xlib.h>
+#include <assert.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <string.h>
@@ -60,12 +61,14 @@
 #include "mach_startup.h"
 #include "mach_startupServer.h"
 
-#include "launchd_fd.h"
+#include "console_redirect.h"
+
 /* From darwinEvents.c ... but don't want to pull in all the server cruft */
 void DarwinListenOnOpenFD(int fd);
 
 /* Ditto, from os/log.c */
 extern void ErrorF(const char *f, ...) _X_ATTRIBUTE_PRINTF(1,2);
+extern void FatalError(const char *f, ...) _X_ATTRIBUTE_PRINTF(1,2) _X_NORETURN;
 
 extern int noPanoramiXExtension;
 
@@ -102,6 +105,10 @@ int server_main(int argc, char **argv, char **envp);
 static int execute(const char *command);
 static char *command_from_prefs(const char *key, const char *default_value);
 
+static char *pref_app_to_run;
+static char *pref_login_shell;
+static char *pref_startx_script;
+
 #ifndef HAVE_LIBDISPATCH
 /*** Pthread Magics ***/
 static pthread_t create_thread(void *(*func)(void *), void *arg) {
@@ -446,7 +453,7 @@ static int startup_trigger(int argc, char **argv, char **envp) {
             /* Could open the display, start the launcher */
             XCloseDisplay(display);
 
-            return execute(command_from_prefs("app_to_run", DEFAULT_CLIENT));
+            return execute(pref_app_to_run);
         }
     }
 
@@ -457,7 +464,7 @@ static int startup_trigger(int argc, char **argv, char **envp) {
     } else {
         ErrorF("X11.app: Could not connect to server (DISPLAY is not set).  Starting X server.\n");
     }
-    return execute(command_from_prefs("startx_script", DEFAULT_STARTX));
+    return execute(pref_startx_script);
 }
 
 /** Setup the environment we want our child processes to inherit */
@@ -475,6 +482,28 @@ static void ensure_path(const char *dir) {
     }
 }
 
+static void setup_console_redirect(const char *bundle_id) {
+    char *asl_sender;
+    char *asl_facility;
+    aslclient aslc;
+
+    asprintf(&asl_sender, "%s.server", bundle_id);
+    assert(asl_sender);
+
+    asl_facility = strdup(bundle_id);
+    assert(asl_facility);
+    if(strcmp(asl_facility + strlen(asl_facility) - 4, ".X11") == 0)
+        asl_facility[strlen(asl_facility) - 4] = '\0';
+
+    assert(aslc = asl_open(asl_sender, asl_facility, ASL_OPT_NO_DELAY));
+    free(asl_sender);
+    free(asl_facility);
+
+    asl_set_filter(aslc, ASL_FILTER_MASK_UPTO(ASL_LEVEL_WARNING));
+    xq_asl_capture_fd(aslc, NULL, ASL_LEVEL_INFO, STDOUT_FILENO);
+    xq_asl_capture_fd(aslc, NULL, ASL_LEVEL_NOTICE, STDERR_FILENO);
+}
+
 static void setup_env(void) {
     char *temp;
     const char *pds = NULL;
@@ -497,6 +526,8 @@ static void setup_env(void) {
         pds = BUNDLE_ID_PREFIX".X11";
     }
 
+    setup_console_redirect(pds);
+
     server_bootstrap_name = strdup(pds);
     if(!server_bootstrap_name) {
         ErrorF("X11.app: Memory allocation error.\n");
@@ -594,11 +625,20 @@ int main(int argc, char **argv, char **envp) {
         pid_t child1, child2;
         int status;
 
+        pref_app_to_run = command_from_prefs("app_to_run", DEFAULT_CLIENT);
+        assert(pref_app_to_run);
+
+        pref_login_shell = command_from_prefs("login_shell", DEFAULT_SHELL);
+        assert(pref_login_shell);
+
+        pref_startx_script = command_from_prefs("startx_script", DEFAULT_STARTX);
+        assert(pref_startx_script);
+
         /* Do the fork-twice trick to avoid having to reap zombies */
         child1 = fork();
         switch (child1) {
             case -1:                                /* error */
-                break;
+                FatalError("fork() failed: %s\n", strerror(errno));
 
             case 0:                                 /* child1 */
                 child2 = fork();
@@ -607,7 +647,7 @@ int main(int argc, char **argv, char **envp) {
                     int max_files, i;
 
                     case -1:                            /* error */
-                        break;
+                        FatalError("fork() failed: %s\n", strerror(errno));
 
                     case 0:                             /* child2 */
                         /* close all open files except for standard streams */
@@ -629,6 +669,10 @@ int main(int argc, char **argv, char **envp) {
             default:                                /* parent */
               waitpid(child1, &status, 0);
         }
+
+        free(pref_app_to_run);
+        free(pref_login_shell);
+        free(pref_startx_script);
     }
     
     /* Main event loop */
@@ -646,7 +690,7 @@ static int execute(const char *command) {
     const char *newargv[4];
     const char **p;
     
-    newargv[0] = command_from_prefs("login_shell", DEFAULT_SHELL);
+    newargv[0] = pref_login_shell;
     newargv[1] = "-c";
     newargv[2] = command;
     newargv[3] = NULL;
diff --git a/xorg-server/hw/xquartz/mach-startup/launchd_fd.c b/xorg-server/hw/xquartz/mach-startup/launchd_fd.c
index 5c7e03cf3..8003dd177 100644
--- a/xorg-server/hw/xquartz/mach-startup/launchd_fd.c
+++ b/xorg-server/hw/xquartz/mach-startup/launchd_fd.c
@@ -31,41 +31,43 @@
 #endif
 
 #include <launch.h>
-#include <stdio.h>
+#include <asl.h>
 #include <errno.h>
 
 #include "launchd_fd.h"
 
+extern aslclient aslc;
+
 int launchd_display_fd(void) {
     launch_data_t sockets_dict, checkin_request, checkin_response;
     launch_data_t listening_fd_array, listening_fd;
 
     /* Get launchd fd */
     if ((checkin_request = launch_data_new_string(LAUNCH_KEY_CHECKIN)) == NULL) {
-        fprintf(stderr,"launch_data_new_string(\"" LAUNCH_KEY_CHECKIN "\") Unable to create string.\n");
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "launch_data_new_string(\"" LAUNCH_KEY_CHECKIN "\") Unable to create string.\n");
         return ERROR_FD;
     }
     
     if ((checkin_response = launch_msg(checkin_request)) == NULL) {
-        fprintf(stderr,"launch_msg(\"" LAUNCH_KEY_CHECKIN "\") IPC failure: %s\n",strerror(errno));
+        asl_log(aslc, NULL, ASL_LEVEL_WARNING, "launch_msg(\"" LAUNCH_KEY_CHECKIN "\") IPC failure: %s\n",strerror(errno));
         return ERROR_FD;
     }
     
     if (LAUNCH_DATA_ERRNO == launch_data_get_type(checkin_response)) {
         // ignore EACCES, which is common if we weren't started by launchd
         if (launch_data_get_errno(checkin_response) != EACCES)
-            fprintf(stderr,"launchd check-in failed: %s\n", strerror(launch_data_get_errno(checkin_response)));
+            asl_log(aslc, NULL, ASL_LEVEL_ERR, "launchd check-in failed: %s\n", strerror(launch_data_get_errno(checkin_response)));
         return ERROR_FD;
     } 
     
     sockets_dict = launch_data_dict_lookup(checkin_response, LAUNCH_JOBKEY_SOCKETS);
     if (NULL == sockets_dict) {
-        fprintf(stderr,"launchd check-in: no sockets found to answer requests on!\n");
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "launchd check-in: no sockets found to answer requests on!\n");
         return ERROR_FD;
     }
     
     if (launch_data_dict_get_count(sockets_dict) > 1) {
-        fprintf(stderr,"launchd check-in: some sockets will be ignored!\n");
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "launchd check-in: some sockets will be ignored!\n");
         return ERROR_FD;
     }
     
@@ -73,13 +75,13 @@ int launchd_display_fd(void) {
     if (NULL == listening_fd_array) {
         listening_fd_array = launch_data_dict_lookup(sockets_dict, ":0");
         if (NULL == listening_fd_array) {
-            fprintf(stderr,"launchd check-in: No known sockets found to answer requests on! \"%s:0\" and \":0\" failed.\n", BUNDLE_ID_PREFIX);
+            asl_log(aslc, NULL, ASL_LEVEL_ERR, "launchd check-in: No known sockets found to answer requests on! \"%s:0\" and \":0\" failed.\n", BUNDLE_ID_PREFIX);
             return ERROR_FD;
         }
     }
     
     if (launch_data_array_get_count(listening_fd_array)!=1) {
-        fprintf(stderr,"launchd check-in: Expected 1 socket from launchd, got %u)\n",
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "launchd check-in: Expected 1 socket from launchd, got %u)\n",
                 (unsigned)launch_data_array_get_count(listening_fd_array));
         return ERROR_FD;
     }
diff --git a/xorg-server/hw/xquartz/mach-startup/stub.c b/xorg-server/hw/xquartz/mach-startup/stub.c
index c8a628311..8319dd06e 100644
--- a/xorg-server/hw/xquartz/mach-startup/stub.c
+++ b/xorg-server/hw/xquartz/mach-startup/stub.c
@@ -33,9 +33,9 @@
 #endif
 
 #include <string.h>
-#include <stdio.h>
 #include <unistd.h>
 #include <errno.h>
+#include <asl.h>
 
 #include <sys/socket.h>
 #include <sys/un.h>
@@ -43,8 +43,6 @@
 #define kX11AppBundleId BUNDLE_ID_PREFIX".X11"
 #define kX11AppBundlePath "/Contents/MacOS/X11"
 
-static char *server_bootstrap_name = kX11AppBundleId;
-
 #include <mach/mach.h>
 #include <mach/mach_error.h>
 #include <servers/bootstrap.h>
@@ -57,8 +55,8 @@ static char *server_bootstrap_name = kX11AppBundleId;
 #include "launchd_fd.h"
 
 static char x11_path[PATH_MAX + 1];
-
 static pid_t x11app_pid = 0;
+aslclient aslc;
 
 static void set_x11_path(void) {
 #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050
@@ -69,26 +67,24 @@ static void set_x11_path(void) {
     switch (osstatus) {
         case noErr:
             if (appURL == NULL) {
-                fprintf(stderr, "Xquartz: Invalid response from LSFindApplicationForInfo(%s)\n", 
+                asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Invalid response from LSFindApplicationForInfo(%s)", 
                         kX11AppBundleId);
                 exit(1);
             }
 
             if (!CFURLGetFileSystemRepresentation(appURL, true, (unsigned char *)x11_path, sizeof(x11_path))) {
-                fprintf(stderr, "Xquartz: Error resolving URL for %s\n", kX11AppBundleId);
+                asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Error resolving URL for %s", kX11AppBundleId);
                 exit(3);
             }
 
             strlcat(x11_path, kX11AppBundlePath, sizeof(x11_path));
-#ifdef DEBUG
-            fprintf(stderr, "Xquartz: X11.app = %s\n", x11_path);
-#endif
+            asl_log(aslc, NULL, ASL_LEVEL_INFO, "Xquartz: X11.app = %s", x11_path);
             break;
         case kLSApplicationNotFoundErr:
-            fprintf(stderr, "Xquartz: Unable to find application for %s\n", kX11AppBundleId);
+            asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Unable to find application for %s", kX11AppBundleId);
             exit(10);
         default:
-            fprintf(stderr, "Xquartz: Unable to find application for %s, error code = %d\n", 
+            asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Unable to find application for %s, error code = %d", 
                     kX11AppBundleId, (int)osstatus);
             exit(11);
     }
@@ -114,12 +110,12 @@ static int connect_to_socket(const char *filename) {
     
     ret_fd = socket(PF_UNIX, SOCK_STREAM, 0);
     if(ret_fd == -1) {
-        fprintf(stderr, "Xquartz: Failed to create socket: %s - %s\n", filename, strerror(errno));
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Failed to create socket: %s - %s", filename, strerror(errno));
         return -1;
     }
 
     if(connect(ret_fd, servaddr, servaddr_len) < 0) {
-        fprintf(stderr, "Xquartz: Failed to connect to socket: %s - %d - %s\n", filename, errno, strerror(errno));
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Failed to connect to socket: %s - %d - %s", filename, errno, strerror(errno));
         close(ret_fd);
         return -1;
     }
@@ -160,14 +156,11 @@ static void send_fd_handoff(int connected_fd, int launchd_fd) {
     *((int*)CMSG_DATA(cmsg)) = launchd_fd;
     
     if(sendmsg(connected_fd, &msg, 0) < 0) {
-        fprintf(stderr, "Xquartz: Error sending $DISPLAY file descriptor over fd %d: %d -- %s\n", connected_fd, errno, strerror(errno));
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Error sending $DISPLAY file descriptor over fd %d: %d -- %s", connected_fd, errno, strerror(errno));
         return;
     }
 
-#ifdef DEBUG
-    fprintf(stderr, "Xquartz: Message sent.  Closing handoff fd.\n");
-#endif
-
+    asl_log(aslc, NULL, ASL_LEVEL_DEBUG, "Xquartz: Message sent.  Closing handoff fd.");
     close(connected_fd);
 }
 
@@ -187,10 +180,25 @@ int main(int argc, char **argv, char **envp) {
     int launchd_fd;
     string_t handoff_socket_filename;
     sig_t handler;
+    char *asl_sender;
+    char *asl_facility;
+    char *server_bootstrap_name = kX11AppBundleId;
 
     if(getenv("X11_PREFS_DOMAIN"))
         server_bootstrap_name = getenv("X11_PREFS_DOMAIN");
-    
+
+    asprintf(&asl_sender, "%s.stub", server_bootstrap_name);
+    assert(asl_sender);
+
+    asl_facility = strdup(server_bootstrap_name);
+    assert(asl_facility);
+    if(strcmp(asl_facility + strlen(asl_facility) - 4, ".X11") == 0)
+        asl_facility[strlen(asl_facility) - 4] = '\0';    
+
+    assert(aslc = asl_open(asl_sender, asl_facility, ASL_OPT_NO_DELAY));
+    free(asl_sender);
+    free(asl_facility);
+
     /* We don't have a mechanism in place to handle this interrupt driven
      * server-start notification, so just send the signal now, so xinit doesn't
      * time out waiting for it and will just poll for the server.
@@ -211,13 +219,13 @@ int main(int argc, char **argv, char **envp) {
     if(kr != KERN_SUCCESS) {
         pid_t child;
 
-        fprintf(stderr, "Xquartz: Unable to locate waiting server: %s\n", server_bootstrap_name);
+        asl_log(aslc, NULL, ASL_LEVEL_WARNING, "Xquartz: Unable to locate waiting server: %s", server_bootstrap_name);
         set_x11_path();
 
         /* This forking is ugly and will be cleaned up later */
         child = fork();
         if(child == -1) {
-            fprintf(stderr, "Xquartz: Could not fork: %s\n", strerror(errno));
+            asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Could not fork: %s", strerror(errno));
             return EXIT_FAILURE;
         }
 
@@ -226,7 +234,7 @@ int main(int argc, char **argv, char **envp) {
             _argv[0] = x11_path;
             _argv[1] = "--listenonly";
             _argv[2] = NULL;
-            fprintf(stderr, "Xquartz: Starting X server: %s --listenonly\n", x11_path);
+            asl_log(aslc, NULL, ASL_LEVEL_NOTICE, "Xquartz: Starting X server: %s --listenonly", x11_path);
             return execvp(x11_path, _argv);
         }
 
@@ -240,9 +248,9 @@ int main(int argc, char **argv, char **envp) {
 
         if(kr != KERN_SUCCESS) {
 #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050
-            fprintf(stderr, "Xquartz: bootstrap_look_up(): %s\n", bootstrap_strerror(kr));
+            asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: bootstrap_look_up(): %s", bootstrap_strerror(kr));
 #else
-            fprintf(stderr, "Xquartz: bootstrap_look_up(): %ul\n", (unsigned long)kr);
+            asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: bootstrap_look_up(): %ul", (unsigned long)kr);
 #endif
             return EXIT_FAILURE;
         }
@@ -258,20 +266,17 @@ int main(int argc, char **argv, char **envp) {
 
         for(try=0, try_max=5; try < try_max; try++) {
             if(request_fd_handoff_socket(mp, handoff_socket_filename) != KERN_SUCCESS) {
-                fprintf(stderr, "Xquartz: Failed to request a socket from the server to send the $DISPLAY fd over (try %d of %d)\n", (int)try+1, (int)try_max);
+                asl_log(aslc, NULL, ASL_LEVEL_INFO, "Xquartz: Failed to request a socket from the server to send the $DISPLAY fd over (try %d of %d)", (int)try+1, (int)try_max);
                 continue;
             }
 
             handoff_fd = connect_to_socket(handoff_socket_filename);
             if(handoff_fd == -1) {
-                fprintf(stderr, "Xquartz: Failed to connect to socket (try %d of %d)\n", (int)try+1, (int)try_max);
+                asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Failed to connect to socket (try %d of %d)", (int)try+1, (int)try_max);
                 continue;
             }
 
-#ifdef DEBUG
-            fprintf(stderr, "Xquartz: Handoff connection established (try %d of %d) on fd %d, \"%s\".  Sending message.\n", (int)try+1, (int)try_max, handoff_fd, handoff_socket_filename);
-#endif
-
+            asl_log(aslc, NULL, ASL_LEVEL_INFO, "Xquartz: Handoff connection established (try %d of %d) on fd %d, \"%s\".  Sending message.", (int)try+1, (int)try_max, handoff_fd, handoff_socket_filename);
             send_fd_handoff(handoff_fd, launchd_fd);            
             close(handoff_fd);
             break;
@@ -288,7 +293,7 @@ int main(int argc, char **argv, char **envp) {
     newenvp = (string_array_t)calloc((1 + envpc), sizeof(string_t));
 
     if(!newargv || !newenvp) {
-        fprintf(stderr, "Xquartz: Memory allocation failure\n");
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Memory allocation failure");
         return EXIT_FAILURE;
     }
     
@@ -305,7 +310,7 @@ int main(int argc, char **argv, char **envp) {
     free(newenvp);
 
     if (kr != KERN_SUCCESS) {
-        fprintf(stderr, "Xquartz: start_x11_server: %s\n", mach_error_string(kr));
+        asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: start_x11_server: %s", mach_error_string(kr));
         return EXIT_FAILURE;
     }
     return EXIT_SUCCESS;
diff --git a/xorg-server/hw/xquartz/man/Xquartz.man b/xorg-server/hw/xquartz/man/Xquartz.man
index 447194740..19e8efbad 100644
--- a/xorg-server/hw/xquartz/man/Xquartz.man
+++ b/xorg-server/hw/xquartz/man/Xquartz.man
@@ -16,72 +16,72 @@ OS X handles the desktop background.
 .SH CUSTOMIZATION
 \fIXquartz\fP can be customized using the defaults(1) command. The available options are:
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 enable_fake_buttons -boolean true
+.B defaults write __bundle_id_prefix__.X11 enable_fake_buttons -boolean true
 Emulates a 3 button mouse using modifier keys. By default, the Command modifier
 is used to emulate button 2 and Option is used for button 3. Thus, clicking the
 first mouse button while holding down Command will act like clicking
 button 2. Holding down Option will simulate button 3.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 fake_button2 \fImodifiers\fP
+.B defaults write __bundle_id_prefix__.X11 fake_button2 \fImodifiers\fP
 Change the modifier keys used to emulate the second mouse button. By default,
 Command is used to emulate the second button. Any combination of the following
 modifier names may be used: {l,r,}shift, {l,r,}option, {l,r,}control, {l,r,}command, fn
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 fake_button3 \fImodifiers\fP
+.B defaults write __bundle_id_prefix__.X11 fake_button3 \fImodifiers\fP
 Change the modifier keys used to emulate the second mouse button. By default,
 Command is used to emulate the second button. Any combination of the following
 modifier names may be used: {l,r,}shift, {l,r,}option, {l,r,}control, {l,r,}command, fn
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 fullscreen_hotkeys -boolean true
+.B defaults write __bundle_id_prefix__.X11 fullscreen_hotkeys -boolean true
 Enable OSX hotkeys while in fullscreen
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 fullscreen_menu -boolean true
+.B defaults write __bundle_id_prefix__.X11 fullscreen_menu -boolean true
 Show the OSX menu while in fullscreen
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 no_quit_alert -boolean true
+.B defaults write __bundle_id_prefix__.X11 no_quit_alert -boolean true
 Disables the alert dialog displayed when attempting to quit X11.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 no_auth -boolean true
+.B defaults write __bundle_id_prefix__.X11 no_auth -boolean true
 Stops the X server requiring that clients authenticate themselves when
 connecting.  See Xsecurity(__miscmansuffix__).
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 nolisten_tcp -boolean false
+.B defaults write __bundle_id_prefix__.X11 nolisten_tcp -boolean false
 This will tell the server to listen and accept TCP connections.  Doing this without enabling
 xauth is a possible security concern.  See Xsecurity(__miscmansuffix__).
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 enable_system_beep -boolean false
+.B defaults write __bundle_id_prefix__.X11 enable_system_beep -boolean false
 Don't use the standard system beep effect for X11 alerts.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 enable_key_equivalents -boolean false
+.B defaults write __bundle_id_prefix__.X11 enable_key_equivalents -boolean false
 Disable menu keyboard equivalents while X11 windows are focused.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 depth \fIdepth\fP
+.B defaults write __bundle_id_prefix__.X11 depth \fIdepth\fP
 Specifies the color bit depth to use. Currently only 15, and 24 color
 bits per pixel are supported. If not specified, or a value of -1 is specified,
 defaults to the depth of the main display.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 sync_keymap -boolean true
+.B defaults write __bundle_id_prefix__.X11 sync_keymap -boolean true
 Keep the X11 keymap up to date with the OSX system keymap.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 option_sends_alt -boolean true
+.B defaults write __bundle_id_prefix__.X11 option_sends_alt -boolean true
 The Option key will send Alt_L and Alt_R instead of Mode_switch.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 sync_pasteboard -boolean true
+.B defaults write __bundle_id_prefix__.X11 sync_pasteboard -boolean true
 Enable syncing between the OSX pasteboard and clipboard/primary selection buffers in X11.  This option needs to be true for any of the other pasteboard sync options to have an effect.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 sync_pasteboard_to_clipboard -boolean true
+.B defaults write __bundle_id_prefix__.X11 sync_pasteboard_to_clipboard -boolean true
 Update the X11 CLIPBOARD when the OSX NSPasteboard is updated.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 sync_pasteboard_to_primary -boolean true
+.B defaults write __bundle_id_prefix__.X11 sync_pasteboard_to_primary -boolean true
 Update the the X11 PRIMARY buffer when the OSX NSPasteboard is updated.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 sync_clipboard_to_pasteboard -boolean true
+.B defaults write __bundle_id_prefix__.X11 sync_clipboard_to_pasteboard -boolean true
 Update the the OSX NSPasteboard when the X11 CLIPBOARD is updated.  Note that enabling this option causes the clipboard synchronization to act as a clipboard manager in X11.  This makes it impossible to use xclipboard, klipper, or any other such clipboard managers.  If you want to use any of these programs, you must disable this option.
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 sync_primary_on_select -boolean true
+.B defaults write __bundle_id_prefix__.X11 sync_primary_on_select -boolean true
 This option defaults to false and is provided only "for experts."  It updates the NSPasteboard whenever a new X11 selection is made (rather than requiring you to hit cmd-c to copy the selection to the NSPasteboard).  Since the X11 protocol does not require applications to send notification when they change selection, this might not work in all cases (if you run into this problem, try selecting text in another application first, then selecting the text you want).
 .TP 8
-.B defaults write __laucnd_id_prefix__.X11 enable_test_extensions -boolean true
+.B defaults write __bundle_id_prefix__.X11 enable_test_extensions -boolean true
 This option defaults to false and is only accessible through the command line.  Enable this option to turn on the DEC-XTRAP, RECORD, and XTEST extensions in the server.
 .SH OPTIONS
 .PP
@@ -102,9 +102,32 @@ Same as fake_button3 above.
 .TP 8
 .B "\-depth \fIdepth\fP"
 Same as depth above.
+.SH LOGGING
+XQuartz stores a server log at ~/Library/Logs/X11.__bundle_id_prefix__.log which
+is analogous to /var/log/Xorg.#.log on systems that use the XFree86 DDX such as
+Linux, BSD, and Solaris.
+.PP
+In addition to this server log, XQuartz sends messages to syslogd(8) using
+asl(3).  These logs are sent to the __bundle_id_prefix__ facility, and you can
+watch these logs using the following syslog(1) command:
+.TP 8
+.B $ syslog -w -k Facility __bundle_id_prefix__
+.PP
+By default, XQaurtz sets an ASL mask which prevents it from logging messages
+below the ASL_LEVEL_WARNING level (meaning almost all logging is done strictly
+to the file referenced above).  To force XQuartz to send all log messages to
+syslogd(8), you can adjust this mask using the following syslog(1) command:
+.TP 8
+.B $ syslog -c X11.bin -d
+.PP
+The stdout and stderr messages printed by any process launched by XQuartz will
+be redirected to this syslog facility with a priority level of ASL_LEVEL_INFO
+and ASL_LEVEL_NOTICE respectively.  In order to see these messages in syslog,
+you will need to adjust XQuartz's asl mask as above but using -i or -n
+instead of -d.
 .SH "SEE ALSO"
 .PP
-X(__miscmansuffix__), Xserver(1), xdm(1), xinit(1)
+X(__miscmansuffix__), Xserver(1), xdm(1), xinit(1), syslog(1), syslogd(8)
 .PP
 http://xquartz.macosforge.org
 .PP
diff --git a/xorg-server/hw/xquartz/quartzKeyboard.c b/xorg-server/hw/xquartz/quartzKeyboard.c
index c54011488..e682f08b6 100644
--- a/xorg-server/hw/xquartz/quartzKeyboard.c
+++ b/xorg-server/hw/xquartz/quartzKeyboard.c
@@ -56,13 +56,7 @@
 
 #include "X11Application.h"
 
-#ifdef NDEBUG
-#undef NDEBUG
 #include <assert.h>
-#define NDEBUG 1
-#else
-#include <assert.h>
-#endif
 #include <pthread.h>
 
 #include "xkbsrv.h"
diff --git a/xorg-server/hw/xquartz/sanitizedCocoa.h b/xorg-server/hw/xquartz/sanitizedCocoa.h
index 58de64c1c..5a2a282d1 100644
--- a/xorg-server/hw/xquartz/sanitizedCocoa.h
+++ b/xorg-server/hw/xquartz/sanitizedCocoa.h
@@ -16,7 +16,8 @@
 #define BOOL         OSX_BOOL
 #define EventType    HIT_EventType
 
-#include <Cocoa/Cocoa.h>
+#import <Cocoa/Cocoa.h>
+#import <Foundation/Foundation.h>
 
 #undef Cursor
 #undef WindowPtr
@@ -24,4 +25,40 @@
 #undef BOOL
 #undef EventType
 
+#ifndef __has_feature
+#define __has_feature(x) 0 // Compatibility with non-clang compilers.
+#endif
+
+#ifndef NS_RETURNS_RETAINED
+#if __has_feature(attribute_ns_returns_retained)
+#define NS_RETURNS_RETAINED __attribute__((ns_returns_retained))
+#else
+#define NS_RETURNS_RETAINED
+#endif
+#endif
+
+#ifndef NS_RETURNS_NOT_RETAINED
+#if __has_feature(attribute_ns_returns_not_retained)
+#define NS_RETURNS_NOT_RETAINED __attribute__((ns_returns_not_retained))
+#else
+#define NS_RETURNS_NOT_RETAINED
+#endif
+#endif
+
+#ifndef CF_RETURNS_RETAINED
+#if __has_feature(attribute_cf_returns_retained)
+#define CF_RETURNS_RETAINED __attribute__((cf_returns_retained))
+#else
+#define CF_RETURNS_RETAINED
+#endif
+#endif
+
+#ifndef CF_RETURNS_NOT_RETAINED
+#if __has_feature(attribute_cf_returns_not_retained)
+#define CF_RETURNS_NOT_RETAINED __attribute__((cf_returns_not_retained))
+#else
+#define CF_RETURNS_NOT_RETAINED
+#endif
+#endif
+
 #endif  /* _XQ_SANITIZED_COCOA_H_ */
diff --git a/xorg-server/hw/xquartz/xpr/xprFrame.c b/xorg-server/hw/xquartz/xpr/xprFrame.c
index 5f6b1cb7b..4818653f6 100644
--- a/xorg-server/hw/xquartz/xpr/xprFrame.c
+++ b/xorg-server/hw/xquartz/xpr/xprFrame.c
@@ -69,7 +69,7 @@ static x_hash_table *window_hash;
 #ifdef HAVE_LIBDISPATCH
 static dispatch_queue_t window_hash_serial_q;
 #else
-static pthread_mutex_t window_hash_mutex;
+static pthread_rwlock_t window_hash_rwlock;
 #endif
 
 /* Prototypes for static functions */
@@ -192,9 +192,9 @@ xprCreateFrame(RootlessWindowPtr pFrame, ScreenPtr pScreen,
         x_hash_table_insert(window_hash, pFrame->wid, pFrame);
     });
 #else
-    pthread_mutex_lock(&window_hash_mutex);
+    pthread_rwlock_wrlock(&window_hash_rwlock);
     x_hash_table_insert(window_hash, pFrame->wid, pFrame);
-    pthread_mutex_unlock(&window_hash_mutex);
+    pthread_rwlock_wrlock(&window_hash_rwlock);
 #endif
 
     xprSetNativeProperty(pFrame);
@@ -216,9 +216,9 @@ xprDestroyFrame(RootlessFrameID wid)
         x_hash_table_remove(window_hash, wid);
     });
 #else
-    pthread_mutex_lock(&window_hash_mutex);
+    pthread_rwlock_wrlock(&window_hash_rwlock);
     x_hash_table_remove(window_hash, wid);
-    pthread_mutex_unlock(&window_hash_mutex);
+    pthread_rwlock_unlock(&window_hash_rwlock);
 #endif
 
     err = xp_destroy_window(x_cvt_vptr_to_uint(wid));
@@ -292,9 +292,9 @@ static void xprRestackFrame(RootlessFrameID wid, RootlessFrameID nextWid) {
         winRec = x_hash_table_lookup(window_hash, wid, NULL);
     });
 #else
-    pthread_mutex_lock(&window_hash_mutex);
+    pthread_rwlock_rdlock(&window_hash_rwlock);
     winRec = x_hash_table_lookup(window_hash, wid, NULL);
-    pthread_mutex_unlock(&window_hash_mutex);
+    pthread_rwlock_unlock(&window_hash_rwlock);
 #endif
     
     if(winRec) {
@@ -479,7 +479,7 @@ xprInit(ScreenPtr pScreen)
 #ifdef HAVE_LIBDISPATCH
     assert((window_hash_serial_q = dispatch_queue_create(BUNDLE_ID_PREFIX".X11.xpr_window_hash", NULL)));
 #else
-    assert(0 == pthread_mutex_init(&window_hash_mutex, NULL));
+    assert(0 == pthread_rwlock_init(&window_hash_rwlock, NULL));
 #endif
     
     return TRUE;
@@ -500,9 +500,9 @@ xprGetXWindow(xp_window_id wid)
     });
 #else
     RootlessWindowRec *winRec;
-    pthread_mutex_lock(&window_hash_mutex);
+    pthread_rwlock_rdlock(&window_hash_rwlock);
     winRec = x_hash_table_lookup(window_hash, x_cvt_uint_to_vptr(wid), NULL);
-    pthread_mutex_unlock(&window_hash_mutex);
+    pthread_rwlock_unlock(&window_hash_rwlock);
 #endif
 
     return winRec != NULL ? winRec->win : NULL;
diff --git a/xorg-server/hw/xwin/winkeybd.c b/xorg-server/hw/xwin/winkeybd.c
index 912e2de1c..2fa6b3f6e 100644
--- a/xorg-server/hw/xwin/winkeybd.c
+++ b/xorg-server/hw/xwin/winkeybd.c
@@ -472,8 +472,7 @@ winKeybdReleaseKeys (void)
 void
 winSendKeyEvent (DWORD dwKey, Bool fDown)
 {
-  EventListPtr events;
-  int i, nevents;
+  InternalEvent* events;
 
   /*
    * When alt-tabing between screens we can get phantom key up messages
@@ -484,11 +483,7 @@ winSendKeyEvent (DWORD dwKey, Bool fDown)
   /* Update the keyState map */
   g_winKeyState[dwKey] = fDown;
 
-  GetEventList(&events);
-  nevents = GetKeyboardEvents(events, g_pwinKeyboard, fDown ? KeyPress : KeyRelease, dwKey + MIN_KEYCODE, NULL);
-
-  for (i = 0; i < nevents; i++)
-    mieqEnqueue(g_pwinKeyboard, (InternalEvent*)events[i].event);
+  QueueKeyboardEvents(g_pwinKeyboard, fDown ? KeyPress : KeyRelease, dwKey + MIN_KEYCODE, NULL);
 
   winDebug("winSendKeyEvent: dwKey: %d, fDown: %d, nEvents %d\n",
            dwKey, fDown, nevents);
diff --git a/xorg-server/hw/xwin/winmouse.c b/xorg-server/hw/xwin/winmouse.c
index 48b426f79..b1b0657cf 100644
--- a/xorg-server/hw/xwin/winmouse.c
+++ b/xorg-server/hw/xwin/winmouse.c
@@ -1,386 +1,375 @@
-/*

- *Copyright (C) 1994-2000 The XFree86 Project, Inc. All Rights Reserved.

- *

- *Permission is hereby granted, free of charge, to any person obtaining

- * a copy of this software and associated documentation files (the

- *"Software"), to deal in the Software without restriction, including

- *without limitation the rights to use, copy, modify, merge, publish,

- *distribute, sublicense, and/or sell copies of the Software, and to

- *permit persons to whom the Software is furnished to do so, subject to

- *the following conditions:

- *

- *The above copyright notice and this permission notice shall be

- *included in all copies or substantial portions of the Software.

- *

- *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

- *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

- *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

- *NONINFRINGEMENT. IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR

- *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF

- *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

- *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

- *

- *Except as contained in this notice, the name of the XFree86 Project

- *shall not be used in advertising or otherwise to promote the sale, use

- *or other dealings in this Software without prior written authorization

- *from the XFree86 Project.

- *

- * Authors:	Dakshinamurthy Karra

- *		Suhaib M Siddiqi

- *		Peter Busch

- *		Harold L Hunt II

- */

-

-#ifdef HAVE_XWIN_CONFIG_H

-#include <xwin-config.h>

-#endif

-#include "win.h"

-

-#include "inputstr.h"

-#include "exevents.h" /* for button/axes labels */

-#include "xserver-properties.h"

-#include "inpututils.h"

-

-/* Peek the internal button mapping */

-static CARD8 const *g_winMouseButtonMap = NULL;

-

-

-/*

- * Local prototypes

- */

-

-static void

-winMouseCtrl (DeviceIntPtr pDevice, PtrCtrl *pCtrl);

-

-

-static void

-winMouseCtrl (DeviceIntPtr pDevice, PtrCtrl *pCtrl)

-{

-}

-

-

-/*

- * See Porting Layer Definition - p. 18

- * This is known as a DeviceProc

- */

-

-int

-winMouseProc (DeviceIntPtr pDeviceInt, int iState)

-{

-  int 			lngMouseButtons, i;

-  int			lngWheelEvents = 2;

-  CARD8			*map;

-  DevicePtr		pDevice = (DevicePtr) pDeviceInt;

-  Atom *btn_labels;

-  Atom axes_labels[2];

-

-  switch (iState)

-    {

-    case DEVICE_INIT:

-      /* Get number of mouse buttons */

-      lngMouseButtons = GetSystemMetrics(SM_CMOUSEBUTTONS);

-

-      /* Mapping of windows events to X events:

-       * LEFT:1 MIDDLE:2 RIGHT:3

-       * SCROLL_UP:4 SCROLL_DOWN:5

-       * XBUTTON 1:6 XBUTTON 2:7 ...

-       *

-       * To map scroll wheel correctly we need at least the 3 normal buttons

-       */

-      if (lngMouseButtons < 3)

-        lngMouseButtons = 3;

-      winMsg(X_PROBED, "%d mouse buttons found\n", lngMouseButtons);

-

-      /* allocate memory: 

-       * number of buttons + 2x mouse wheel event + 1 extra (offset for map) 

-       */

-      map = malloc(sizeof(CARD8) * (lngMouseButtons + lngWheelEvents + 1));

-    

-      /* initalize button map */ 

-      map[0] = 0;

-      for (i=1; i <= lngMouseButtons + lngWheelEvents; i++)

-      	map[i] = i;

-

-      btn_labels = calloc((lngMouseButtons + lngWheelEvents), sizeof(Atom));

-      btn_labels[0] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_LEFT);

-      btn_labels[1] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_MIDDLE);

-      btn_labels[2] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_RIGHT);

-      btn_labels[3] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_WHEEL_UP);

-      btn_labels[4] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_WHEEL_DOWN);

-

-      axes_labels[0] = XIGetKnownProperty(AXIS_LABEL_PROP_REL_X);

-      axes_labels[1] = XIGetKnownProperty(AXIS_LABEL_PROP_REL_Y);

-

-      InitPointerDeviceStruct (pDevice,

-			       map,

-			       lngMouseButtons + lngWheelEvents,

-			       btn_labels,

-			       winMouseCtrl,

-			       GetMotionHistorySize(),

-			       2,

-			       axes_labels);

-      free(map);

-      free(btn_labels);

-

-      g_winMouseButtonMap = pDeviceInt->button->map;

-      break;

-

-    case DEVICE_ON:

-      pDevice->on = TRUE;

-      break;

-

-    case DEVICE_CLOSE:

-      g_winMouseButtonMap = NULL;

-

-    case DEVICE_OFF:

-      pDevice->on = FALSE;

-      break;

-    }

-  return Success;

-}

-

-

-/* Handle the mouse wheel */

-int

-winMouseWheel (ScreenPtr pScreen, int iDeltaZ)

-{

-  winScreenPriv(pScreen);

-  int button; /* Button4 or Button5 */

-

-  /* Button4 = WheelUp */

-  /* Button5 = WheelDown */

-

-  /* Do we have any previous delta stored? */

-  if ((pScreenPriv->iDeltaZ > 0

-       && iDeltaZ > 0)

-      || (pScreenPriv->iDeltaZ < 0

-	  && iDeltaZ < 0))

-    {

-      /* Previous delta and of same sign as current delta */

-      iDeltaZ += pScreenPriv->iDeltaZ;

-      pScreenPriv->iDeltaZ = 0;

-    }

-  else

-    {

-      /*

-       * Previous delta of different sign, or zero.

-       * We will set it to zero for either case,

-       * as blindly setting takes just as much time

-       * as checking, then setting if necessary :)

-       */

-      pScreenPriv->iDeltaZ = 0;

-    }

-

-  /*

-   * Only process this message if the wheel has moved further than

-   * WHEEL_DELTA

-   */

-  if (iDeltaZ >= WHEEL_DELTA || (-1 * iDeltaZ) >= WHEEL_DELTA)

-    {

-      pScreenPriv->iDeltaZ = 0;

-	  

-      /* Figure out how many whole deltas of the wheel we have */

-      iDeltaZ /= WHEEL_DELTA;

-    }

-  else

-    {

-      /*

-       * Wheel has not moved past WHEEL_DELTA threshold;

-       * we will store the wheel delta until the threshold

-       * has been reached.

-       */

-      pScreenPriv->iDeltaZ = iDeltaZ;

-      return 0;

-    }

-

-  /* Set the button to indicate up or down wheel delta */

-  if (iDeltaZ > 0)

-    {

-      button = Button4;

-    }

-  else

-    {

-      button = Button5;

-    }

-

-  /*

-   * Flip iDeltaZ to positive, if negative,

-   * because always need to generate a *positive* number of

-   * button clicks for the Z axis.

-   */

-  if (iDeltaZ < 0)

-    {

-      iDeltaZ *= -1;

-    }

-

-  /* Generate X input messages for each wheel delta we have seen */

-  while (iDeltaZ--)

-    {

-      /* Push the wheel button */

-      winMouseButtonsSendEvent (ButtonPress, button);

-

-      /* Release the wheel button */

-      winMouseButtonsSendEvent (ButtonRelease, button);

-    }

-

-  return 0;

-}

-

-

-/*

- * Enqueue a mouse button event

- */

-

-void

-winMouseButtonsSendEvent (int iEventType, int iButton)

-{

-  EventListPtr events;

-  int i, nevents;

-  ValuatorMask mask;

-

-  if (g_winMouseButtonMap)

-    iButton = g_winMouseButtonMap[iButton];

-

-  valuator_mask_zero(&mask);

-  GetEventList(&events);

-  nevents = GetPointerEvents(events, g_pwinPointer, iEventType, iButton,

-			     POINTER_RELATIVE, &mask);

-

-  for (i = 0; i < nevents; i++)

-    mieqEnqueue(g_pwinPointer, (InternalEvent*)events[i].event);

-

-#if CYGDEBUG

-  ErrorF("winMouseButtonsSendEvent: iEventType: %d, iButton: %d, nEvents %d\n",

-          iEventType, iButton, nevents);

-#endif

-}

-

-

-/*

- * Decide what to do with a Windows mouse message

- */

-

-int

-winMouseButtonsHandle (ScreenPtr pScreen,

-		       int iEventType, int iButton,

-		       WPARAM wParam)

-{

-  winScreenPriv(pScreen);

-  winScreenInfo		*pScreenInfo = pScreenPriv->pScreenInfo;

-

-  /* Send button events right away if emulate 3 buttons is off */

-  if (pScreenInfo->iE3BTimeout == WIN_E3B_OFF)

-    {

-      /* Emulate 3 buttons is off, send the button event */

-      winMouseButtonsSendEvent (iEventType, iButton);

-      return 0;

-    }

-

-  /* Emulate 3 buttons is on, let the fun begin */

-  if (iEventType == ButtonPress

-      && pScreenPriv->iE3BCachedPress == 0

-      && !pScreenPriv->fE3BFakeButton2Sent)

-    {

-      /*

-       * Button was pressed, no press is cached,

-       * and there is no fake button 2 release pending.

-       */

-

-      /* Store button press type */

-      pScreenPriv->iE3BCachedPress = iButton;

-

-      /*

-       * Set a timer to send this button press if the other button

-       * is not pressed within the timeout time.

-       */

-      SetTimer (pScreenPriv->hwndScreen,

-		WIN_E3B_TIMER_ID,

-		pScreenInfo->iE3BTimeout,

-		NULL);

-    }

-  else if (iEventType == ButtonPress

-	   && pScreenPriv->iE3BCachedPress != 0

-	   && pScreenPriv->iE3BCachedPress != iButton

-	   && !pScreenPriv->fE3BFakeButton2Sent)

-    {

-      /*

-       * Button press is cached, other button was pressed,

-       * and there is no fake button 2 release pending.

-       */

-

-      /* Mouse button was cached and other button was pressed */

-      KillTimer (pScreenPriv->hwndScreen, WIN_E3B_TIMER_ID);

-      pScreenPriv->iE3BCachedPress = 0;

-

-      /* Send fake middle button */

-      winMouseButtonsSendEvent (ButtonPress, Button2);

-

-      /* Indicate that a fake middle button event was sent */

-      pScreenPriv->fE3BFakeButton2Sent = TRUE;

-    }

-  else if (iEventType == ButtonRelease

-	   && pScreenPriv->iE3BCachedPress == iButton)

-    {

-      /*

-       * Cached button was released before timer ran out,

-       * and before the other mouse button was pressed.

-       */

-      KillTimer (pScreenPriv->hwndScreen, WIN_E3B_TIMER_ID);

-      pScreenPriv->iE3BCachedPress = 0;

-

-      /* Send cached press, then send release */

-      winMouseButtonsSendEvent (ButtonPress, iButton);

-      winMouseButtonsSendEvent (ButtonRelease, iButton);

-    }

-  else if (iEventType == ButtonRelease

-	   && pScreenPriv->fE3BFakeButton2Sent

-	   && !(wParam & MK_LBUTTON)

-	   && !(wParam & MK_RBUTTON))

-    {

-      /*

-       * Fake button 2 was sent and both mouse buttons have now been released

-       */

-      pScreenPriv->fE3BFakeButton2Sent = FALSE;

-      

-      /* Send middle mouse button release */

-      winMouseButtonsSendEvent (ButtonRelease, Button2);

-    }

-  else if (iEventType == ButtonRelease

-	   && pScreenPriv->iE3BCachedPress == 0

-	   && !pScreenPriv->fE3BFakeButton2Sent)

-    {

-      /*

-       * Button was release, no button is cached,

-       * and there is no fake button 2 release is pending.

-       */

-      winMouseButtonsSendEvent (ButtonRelease, iButton);

-    }

-

-  return 0;

-}

-

-/**

- * Enqueue a motion event.

- *

- *  XXX: miPointerMove does exactly this, but is static :-( (and uses a static buffer)

- *

- */

-void winEnqueueMotion(int x, int y)

-{

-  int i, nevents;

-  int valuators[2];

-  ValuatorMask mask;

-  EventListPtr events;

-

-  miPointerSetPosition(g_pwinPointer, POINTER_RELATIVE, &x, &y);

-  valuators[0] = x;

-  valuators[1] = y;

-

-  valuator_mask_set_range(&mask, 0, 2, valuators);

-  GetEventList(&events);

-  nevents = GetPointerEvents(events, g_pwinPointer, MotionNotify, 0,

-			     POINTER_ABSOLUTE | POINTER_SCREEN, &mask);

-

-  for (i = 0; i < nevents; i++)

-    mieqEnqueue(g_pwinPointer, (InternalEvent*)events[i].event);

-}

+/*
+ *Copyright (C) 1994-2000 The XFree86 Project, Inc. All Rights Reserved.
+ *
+ *Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ *"Software"), to deal in the Software without restriction, including
+ *without limitation the rights to use, copy, modify, merge, publish,
+ *distribute, sublicense, and/or sell copies of the Software, and to
+ *permit persons to whom the Software is furnished to do so, subject to
+ *the following conditions:
+ *
+ *The above copyright notice and this permission notice shall be
+ *included in all copies or substantial portions of the Software.
+ *
+ *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *NONINFRINGEMENT. IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR
+ *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ *Except as contained in this notice, the name of the XFree86 Project
+ *shall not be used in advertising or otherwise to promote the sale, use
+ *or other dealings in this Software without prior written authorization
+ *from the XFree86 Project.
+ *
+ * Authors:	Dakshinamurthy Karra
+ *		Suhaib M Siddiqi
+ *		Peter Busch
+ *		Harold L Hunt II
+ */
+
+#ifdef HAVE_XWIN_CONFIG_H
+#include <xwin-config.h>
+#endif
+#include "win.h"
+
+#include "inputstr.h"
+#include "exevents.h" /* for button/axes labels */
+#include "xserver-properties.h"
+#include "inpututils.h"
+
+/* Peek the internal button mapping */
+static CARD8 const *g_winMouseButtonMap = NULL;
+
+
+/*
+ * Local prototypes
+ */
+
+static void
+winMouseCtrl (DeviceIntPtr pDevice, PtrCtrl *pCtrl);
+
+
+static void
+winMouseCtrl (DeviceIntPtr pDevice, PtrCtrl *pCtrl)
+{
+}
+
+
+/*
+ * See Porting Layer Definition - p. 18
+ * This is known as a DeviceProc
+ */
+
+int
+winMouseProc (DeviceIntPtr pDeviceInt, int iState)
+{
+  int 			lngMouseButtons, i;
+  int			lngWheelEvents = 2;
+  CARD8			*map;
+  DevicePtr		pDevice = (DevicePtr) pDeviceInt;
+  Atom *btn_labels;
+  Atom axes_labels[2];
+
+  switch (iState)
+    {
+    case DEVICE_INIT:
+      /* Get number of mouse buttons */
+      lngMouseButtons = GetSystemMetrics(SM_CMOUSEBUTTONS);
+
+      /* Mapping of windows events to X events:
+       * LEFT:1 MIDDLE:2 RIGHT:3
+       * SCROLL_UP:4 SCROLL_DOWN:5
+       * XBUTTON 1:6 XBUTTON 2:7 ...
+       *
+       * To map scroll wheel correctly we need at least the 3 normal buttons
+       */
+      if (lngMouseButtons < 3)
+        lngMouseButtons = 3;
+      winMsg(X_PROBED, "%d mouse buttons found\n", lngMouseButtons);
+
+      /* allocate memory: 
+       * number of buttons + 2x mouse wheel event + 1 extra (offset for map) 
+       */
+      map = malloc(sizeof(CARD8) * (lngMouseButtons + lngWheelEvents + 1));
+    
+      /* initalize button map */ 
+      map[0] = 0;
+      for (i=1; i <= lngMouseButtons + lngWheelEvents; i++)
+      	map[i] = i;
+
+      btn_labels = calloc((lngMouseButtons + lngWheelEvents), sizeof(Atom));
+      btn_labels[0] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_LEFT);
+      btn_labels[1] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_MIDDLE);
+      btn_labels[2] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_RIGHT);
+      btn_labels[3] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_WHEEL_UP);
+      btn_labels[4] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_WHEEL_DOWN);
+
+      axes_labels[0] = XIGetKnownProperty(AXIS_LABEL_PROP_REL_X);
+      axes_labels[1] = XIGetKnownProperty(AXIS_LABEL_PROP_REL_Y);
+
+      InitPointerDeviceStruct (pDevice,
+			       map,
+			       lngMouseButtons + lngWheelEvents,
+			       btn_labels,
+			       winMouseCtrl,
+			       GetMotionHistorySize(),
+			       2,
+			       axes_labels);
+      free(map);
+      free(btn_labels);
+
+      g_winMouseButtonMap = pDeviceInt->button->map;
+      break;
+
+    case DEVICE_ON:
+      pDevice->on = TRUE;
+      break;
+
+    case DEVICE_CLOSE:
+      g_winMouseButtonMap = NULL;
+
+    case DEVICE_OFF:
+      pDevice->on = FALSE;
+      break;
+    }
+  return Success;
+}
+
+
+/* Handle the mouse wheel */
+int
+winMouseWheel (ScreenPtr pScreen, int iDeltaZ)
+{
+  winScreenPriv(pScreen);
+  int button; /* Button4 or Button5 */
+
+  /* Button4 = WheelUp */
+  /* Button5 = WheelDown */
+
+  /* Do we have any previous delta stored? */
+  if ((pScreenPriv->iDeltaZ > 0
+       && iDeltaZ > 0)
+      || (pScreenPriv->iDeltaZ < 0
+	  && iDeltaZ < 0))
+    {
+      /* Previous delta and of same sign as current delta */
+      iDeltaZ += pScreenPriv->iDeltaZ;
+      pScreenPriv->iDeltaZ = 0;
+    }
+  else
+    {
+      /*
+       * Previous delta of different sign, or zero.
+       * We will set it to zero for either case,
+       * as blindly setting takes just as much time
+       * as checking, then setting if necessary :)
+       */
+      pScreenPriv->iDeltaZ = 0;
+    }
+
+  /*
+   * Only process this message if the wheel has moved further than
+   * WHEEL_DELTA
+   */
+  if (iDeltaZ >= WHEEL_DELTA || (-1 * iDeltaZ) >= WHEEL_DELTA)
+    {
+      pScreenPriv->iDeltaZ = 0;
+	  
+      /* Figure out how many whole deltas of the wheel we have */
+      iDeltaZ /= WHEEL_DELTA;
+    }
+  else
+    {
+      /*
+       * Wheel has not moved past WHEEL_DELTA threshold;
+       * we will store the wheel delta until the threshold
+       * has been reached.
+       */
+      pScreenPriv->iDeltaZ = iDeltaZ;
+      return 0;
+    }
+
+  /* Set the button to indicate up or down wheel delta */
+  if (iDeltaZ > 0)
+    {
+      button = Button4;
+    }
+  else
+    {
+      button = Button5;
+    }
+
+  /*
+   * Flip iDeltaZ to positive, if negative,
+   * because always need to generate a *positive* number of
+   * button clicks for the Z axis.
+   */
+  if (iDeltaZ < 0)
+    {
+      iDeltaZ *= -1;
+    }
+
+  /* Generate X input messages for each wheel delta we have seen */
+  while (iDeltaZ--)
+    {
+      /* Push the wheel button */
+      winMouseButtonsSendEvent (ButtonPress, button);
+
+      /* Release the wheel button */
+      winMouseButtonsSendEvent (ButtonRelease, button);
+    }
+
+  return 0;
+}
+
+
+/*
+ * Enqueue a mouse button event
+ */
+
+void
+winMouseButtonsSendEvent (int iEventType, int iButton)
+{
+  ValuatorMask mask;
+
+  if (g_winMouseButtonMap)
+    iButton = g_winMouseButtonMap[iButton];
+
+  valuator_mask_zero(&mask);
+  QueuePointerEvents(g_pwinPointer, iEventType, iButton,
+		     POINTER_RELATIVE, &mask);
+
+#if CYGDEBUG
+  ErrorF("winMouseButtonsSendEvent: iEventType: %d, iButton: %d, nEvents %d\n",
+          iEventType, iButton, nevents);
+#endif
+}
+
+
+/*
+ * Decide what to do with a Windows mouse message
+ */
+
+int
+winMouseButtonsHandle (ScreenPtr pScreen,
+		       int iEventType, int iButton,
+		       WPARAM wParam)
+{
+  winScreenPriv(pScreen);
+  winScreenInfo		*pScreenInfo = pScreenPriv->pScreenInfo;
+
+  /* Send button events right away if emulate 3 buttons is off */
+  if (pScreenInfo->iE3BTimeout == WIN_E3B_OFF)
+    {
+      /* Emulate 3 buttons is off, send the button event */
+      winMouseButtonsSendEvent (iEventType, iButton);
+      return 0;
+    }
+
+  /* Emulate 3 buttons is on, let the fun begin */
+  if (iEventType == ButtonPress
+      && pScreenPriv->iE3BCachedPress == 0
+      && !pScreenPriv->fE3BFakeButton2Sent)
+    {
+      /*
+       * Button was pressed, no press is cached,
+       * and there is no fake button 2 release pending.
+       */
+
+      /* Store button press type */
+      pScreenPriv->iE3BCachedPress = iButton;
+
+      /*
+       * Set a timer to send this button press if the other button
+       * is not pressed within the timeout time.
+       */
+      SetTimer (pScreenPriv->hwndScreen,
+		WIN_E3B_TIMER_ID,
+		pScreenInfo->iE3BTimeout,
+		NULL);
+    }
+  else if (iEventType == ButtonPress
+	   && pScreenPriv->iE3BCachedPress != 0
+	   && pScreenPriv->iE3BCachedPress != iButton
+	   && !pScreenPriv->fE3BFakeButton2Sent)
+    {
+      /*
+       * Button press is cached, other button was pressed,
+       * and there is no fake button 2 release pending.
+       */
+
+      /* Mouse button was cached and other button was pressed */
+      KillTimer (pScreenPriv->hwndScreen, WIN_E3B_TIMER_ID);
+      pScreenPriv->iE3BCachedPress = 0;
+
+      /* Send fake middle button */
+      winMouseButtonsSendEvent (ButtonPress, Button2);
+
+      /* Indicate that a fake middle button event was sent */
+      pScreenPriv->fE3BFakeButton2Sent = TRUE;
+    }
+  else if (iEventType == ButtonRelease
+	   && pScreenPriv->iE3BCachedPress == iButton)
+    {
+      /*
+       * Cached button was released before timer ran out,
+       * and before the other mouse button was pressed.
+       */
+      KillTimer (pScreenPriv->hwndScreen, WIN_E3B_TIMER_ID);
+      pScreenPriv->iE3BCachedPress = 0;
+
+      /* Send cached press, then send release */
+      winMouseButtonsSendEvent (ButtonPress, iButton);
+      winMouseButtonsSendEvent (ButtonRelease, iButton);
+    }
+  else if (iEventType == ButtonRelease
+	   && pScreenPriv->fE3BFakeButton2Sent
+	   && !(wParam & MK_LBUTTON)
+	   && !(wParam & MK_RBUTTON))
+    {
+      /*
+       * Fake button 2 was sent and both mouse buttons have now been released
+       */
+      pScreenPriv->fE3BFakeButton2Sent = FALSE;
+      
+      /* Send middle mouse button release */
+      winMouseButtonsSendEvent (ButtonRelease, Button2);
+    }
+  else if (iEventType == ButtonRelease
+	   && pScreenPriv->iE3BCachedPress == 0
+	   && !pScreenPriv->fE3BFakeButton2Sent)
+    {
+      /*
+       * Button was release, no button is cached,
+       * and there is no fake button 2 release is pending.
+       */
+      winMouseButtonsSendEvent (ButtonRelease, iButton);
+    }
+
+  return 0;
+}
+
+/**
+ * Enqueue a motion event.
+ *
+ *  XXX: miPointerMove does exactly this, but is static :-( (and uses a static buffer)
+ *
+ */
+void winEnqueueMotion(int x, int y)
+{
+  int valuators[2];
+  ValuatorMask mask;
+
+  miPointerSetPosition(g_pwinPointer, POINTER_RELATIVE, &x, &y);
+  valuators[0] = x;
+  valuators[1] = y;
+
+  valuator_mask_set_range(&mask, 0, 2, valuators);
+  QueuePointerEvents(g_pwinPointer, MotionNotify, 0,
+		     POINTER_ABSOLUTE | POINTER_SCREEN, &mask);
+
+}