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authormarha <marha@users.sourceforge.net>2009-07-25 20:12:58 +0000
committermarha <marha@users.sourceforge.net>2009-07-25 20:12:58 +0000
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-
- README for XFree86 OS-support Layer
- -----------------------------------
-
-Contents
---------
- 1) Overview
- 2) Directory Layout
- 3) Adding a new OS
- 4) OS Support API
-
-1 - Overview
-------------
- This directory contains the OS support layer functions for the XFree86
-servers. In addition, some miscellaneous server support functions (not
-OS-dependent) are included here, to take advantage of the fact that this
-library comes last in the linking order.
-
-Most of the functionality required to support a new OS is encapsulated in
-this library. It is hoped that all OS-specific details can be encapsulated,
-but that is not likely ever to be completely possible. Hence some minor
-changes will wind up being made in other parts of the server. The major
-design principles for this library are maintainability, readability, and
-portability. Sometimes these goals conflict; some somewhat arbitrary choices
-have been made in implementation.
-
-2 - Directory Layout
---------------------
- os-support/ Contains headers and documentation; no code
- misc/ Non-OS-specific miscellaneous functions that
- fit best into the link architecture this way.
- shared/ Contains files with functions used by more than one
- OS. These are symlinked into the OS subdirectories
- at build time via Imakefile rules. This is alway
- preferable to reproducing functions in more than one
- OS library.
- bsd/ OS support for the 386BSD/NetBSD/FreeBSD operating
- systems.
- bsdi/ OS support for the BSD/386 operating system.
- linux/ OS support for the Linux operating system.
- sco/ OS support for the SCO SVR3.x operating system.
- solx86/ OS support for the Solaris x86 operating system.
- sysv/ OS support for all SVR4.0 and SVR4.2, and for
- ISC and AT&T SVR3.2 operating systems.
-
-3 - Adding A New OS
--------------------
- Adding a support for a new operating system entails implementing all of
-the functions described in the API below. Many of these functions are no-ops
-for many operating systems, and appropriate files with dummy declarations are
-available in the 'shared' subdirectory.
-
-If your OS is sufficiently similar to an existing OS, you can make use of
-the existing subdirectory. One of the reasons for implementing this OS
-library was the unmaintainability of the spagetti-#ifdef code that existed
-before. You should try to avoid cluttering the code with #ifdef's. If
-you find that the subdirectory is getting cluttered, split off into a
-seperate subdirectory (e.g. as was done for SCO, rather than cluttering
-the 'sysv' subdirectory). You can split functions out of an existing
-subdirectory into the 'shared' subdirectory, if that is appropriate. Just
-remember to update the Imakefile for the old subdirectory.
-
-You will still likely have to make some small changes to other parts of
-the server. You should not put OS-specific #define's or #include's anywhere
-else in the server. These should all go in the "xf86_OSlib.h" header file
-in this directory.
-
-4 - OS Support API
------------------
-void xf86OpenConsole(void)
-{
- /*
- * Open console device, activate VTs, etc, etc. Fill in requisite
- * pieces of xf86Info. Most of this code comes from xf86Init.c
- */
-}
-
-void xf86CloseConsole(void)
-{
- /*
- * Close console at server exit.
- */
-}
-
-Bool xf86VTSwitchPending(void)
-{
- /*
- * Returns TRUE iff there is a VT switch operation pending for
- * the server. In the USL VT model, this is indicated via a
- * signal handler. Should return FALSE always for OSs without
- * VTs.
- */
-}
-
-Bool xf86VTSwitchAway(void)
-{
- /*
- * Handles the OS-specific action for switching away from the active
- * VT. Returns FALSE if the switch away fails. Should return
- * FALSE always for OSs without VTs (then again, this function
- * should never be called in that case).
- */
-}
-
-Bool xf86VTSwitchTo(void)
-{
- /*
- * Handles the OS-specific action for switching to the active VT.
- * Returns FALSE if the switch to fails. Should return TRUE
- * always for OSs without VTs (then again, this function should
- * never be called in that case).
- */
-}
-
-Bool xf86LinearVidMem(void)
-{
- /*
- * Returns TRUE if the OS supports mapping linear frame buffers
- * (ie memory at addresses above physical memory).
- */
-}
-
-pointer xf86MapVidMem(int ScreenNum, pointer Base, unsigned long Size)
-{
- /*
- * Handle mapping the video memory. Returns (pointer *)0 for
- * failure; causes server exit. It is allowable to call FatalError()
- * from inside this function and exit directly.
- */
-}
-
-void xf86UnMapVidMem(int ScreenNum, pointer Base, unsigned long Size)
-{
- /*
- * Handle unmapping the video memory. This should undo what
- * xf86MapVidMem() does. Base is a pointer obtained from
- * a previous call to xf86MapVidMem().
- */
-}
-
-void xf86MapDisplay(int ScreenNum, int Region)
-{
- /*
- * For OSs that require the screen be mapped when entering a VT.
- * A dummy function will be defined for OSs that don't require
- * this (or don't have VTs at all).
- */
-}
-
-void xf86UnMapDisplay(int ScreenNum, int Region)
-{
- /*
- * For Os that require that the screen be unmapped when leaving a
- * VT. A dummy function will be defined for OSs that don't require
- * this (or don't have VTs at all).
- */
-}
-
-int xf86ReadBIOS(unsigned long Base, unsigned long Offset,
- unsigned char *Buf, int Len)
-{
- /*
- * Read Len bytes from the BIOS at address Base, offset Offset,
- * into buffer Buf. Returns -1 for failure or if the OS does
- * not support reading the BIOS. This causes a driver probe
- * to fail, but does not cause the server to abort.
- */
-}
-
-
-void xf86EnableIOPorts(int ScreenNum)
-{
- /*
- * Enables I/O permissions. The OS layer should
- * enable all I/O port access.
- */
-}
-
-void xf86DisableIOPorts(int ScreenNum)
-{
- /*
- * Disables I/O permissions.
- */
-}
-
-Bool xf86DisableInterrupts(void)
-{
- /*
- * Disable interrupts if allowed for this OS. Returns FALSE if
- * this is not allowed or if the attempt fails for some reason.
- */
-}
-
-void xf86EnableInterrupts(void)
-{
- /*
- * Reenable interrupts
- */
-}
-
-int xf86ProcessArgument(int argc, char *argv[], int i)
-{
- /*
- * Process OS-specific command-line arguments. See
- * ddxProcessArgument() for more info.
- */
-}
-
-void xf86UseMsg(void)
-{
- /*
- * Print list of OS-specific command-line arguments. See
- * ddxUseMsg() for more info.
- */
-}
-
-void xf86SoundKbdBell(int loudness, int pitch, int duration)
-{
- /*
- * Sound the keyboard bell. pitch is in Hz, duration in ms,
- * loudness is in the range 0-100 (0 -> off). For systems
- * where the loudness can't be controlled, scale the duration
- * by loudness/50.
- */
-}
-
-void xf86SetKbdLeds(int leds)
-{
- /*
- * Set the keyboard LEDs to the state indicated in leds
- */
-}
-
-int xf86GetKbdLeds(void)
-{
- /*
- * Return the state of the keyboard LEDs. If the OS doesn't
- * support this, return 0.
- */
-}
-
-void xf86SetKbdRepeat(char rad)
-{
- /*
- * Set the keyboard repeat rate and delay according the
- * the rad value. The lower 5 bits determine the repeat
- * rate (lower value -> higher rate). The next 2 bits
- * determine the delay.
- * This should possibly be changed to take separate rate and
- * delay parameters.
- */
-}
-
-void xf86KbdInit(void)
-{
- /*
- * Save initial keyboard state. This is called at the start of
- * each server generation.
- */
-}
-
-int xf86KbdOn(void)
-{
- /*
- * Set the keyboard up for use with X. This is called whenever
- * the server becomes active (ie at the start of each generation and
- * whenever its VT becomes active). Return the file descriptor
- * for keyboard input. Return -1 if there is no file descriptor
- * to add as an input device. If there are errors encountered,
- * call FatalError(). A return value of -1 is not considered an
- * error condition.
- */
-}
-
-int xf86KbdOff(void)
-{
- /*
- * Return the keyboard to the state saved by xf86KbdInit(). This is
- * called at the end of a server generation, and also when the
- * server's VT ceases being active. Returns the keyboard file
- * descriptor. Returns -1 if there is no file descriptor to be
- * removed as an input device. Errors should be handled the same
- * way as in xf86KbdOn().
- */
-}
-
-void xf86KbdEvents(void)
-{
- /*
- * Read characters from the keyboard device, and post the events
- * by calling xf86PostKbdEvent(). Read as much as is available
- * without waiting.
- */
-}
-
-void xf86SetMouseSpeed(int old, int new, unsigned cflag)
-{
- /*
- * Set the speed of the mouse port. old is the previous speed,
- * new is the new speed, and cflag is the value of the termio[s]
- * c_cflag field. For mice that have programmable speed operation,
- * this should send the appropriate commands to the mouse.
- */
-}
-
-void xf86MouseInit(void)
-{
- /*
- * This is called at the start of each server generation. In most
- * cases this is a noop. If the mouse must not be opened/closed
- * when VT switching, the open should be done here.
- */
-}
-
-int xf86MousedOn(void)
-{
- /*
- * Set the mouse up for use with X. This is called whenever
- * the server becomes active (ie at the start of each generation and
- * whenever its VT becomes active). This function normally opens
- * the mouse device, and may call xf86SetupMouse() to initialise
- * the mouse parameters. Return the file descriptor for mouse input.
- * Return -1 if there is no file descriptor to add as an input
- * device. If there are errors encountered, call FatalError().
- * A return value of -1 is not considered an error condition.
- */
-}
-
-int xf86MouseOff(Bool doclose)
-{
- /*
- * Release the mouse from use with X. This is called at the end
- * of a server generation (with doclose==TRUE), and also when the
- * server's VT ceases being active (with doclose==FALSE). If the
- * mouse should not be opened/closed when VT switching, the close
- * should be done here when doclose==TRUE. For other systems, the
- * mouse device should be closed regardless of the doclose value.
- * Returns the mouse file descriptor. Returns -1 if there is no
- * file descriptor to be removed as an input device. Errors
- * should be handled the same way as in xf86MouseOn().
- */
-}
-
-void xf86MouseEvents(void)
-{
- /*
- * Read characters from the mouse device, and post the events
- * by calling xf86PostMseEvent(). Read as much as is available
- * without waiting. If the OS doesn't handle the mouse protocol
- * translation, xf86MouseProtocol() may be called to do the
- * translation and event posting. If the OS does handle the protocol
- * translation, MOUSE_PROTOCOL_IN_KERNEL should be #define'd in
- * xf86_OSlib.h.
- */
-}
-
-int xf86OsMouseProc(DevicePtr pPointer, int what)
-{
- /*
- * Implements the device-proc for the pointer device when an
- * OS-based mouse driver is being used (as opposed to the
- * server's internal mouse driver). Implemented as any other
- * device-proc in the server.
- *
- * This function only needs to be implemented if USE_OSMOUSE is
- * defined for the OS.
- */
-}
-
-int xf86OsMouseEvents(void)
-{
- /*
- * When supporting an OS-based mouse driver (as opposed to the
- * server's internal mouse driver), read some events from the device
- * and post them to the DIX layer through xf86PostMseEvent().
- *
- * This function only needs to be implemented if USE_OSMOUSE is
- * defined for the OS.
- */
-}
-
-void xf86OsMouseOption(int token, pointer lex_ptr)
-{
- /*
- * Used in parsing an OsMouse keyword from the Xconfig file.
- * Passed the token type and a pointer to the token value.
- * The function should do whatever is appropriate for the OS's
- * mouse driver.
- *
- * This function only needs to be implemented if USE_OSMOUSE is
- * defined for the OS.
- */
-}
-
-/*
- * The following functions are simply wrappers around the OS specific
- * libc functions
- */
-
-void *
-xf86memmove(void * dest, const void * src, INT32 n)
-{
- return(memmove(dest,src,n));
-}
-
-void *
-xf86memset(void * s, int c, INT32 n)
-{
- return(memset(s,c,n));
-}
-
-void *
-xf86memcpy(void * dest, const void * src, INT32 n)
-{
- return(memcpy(dest,src,n));
-}
-
-int
-xf86memcmp(const void * s1, const void * s2, INT32 n)
-{
- return(memcmp(s1,s2,n));
-}
-
-char *
-xf86strcat(char * dest, const char * src)
-{
- return(strcat(dest,src));
-}
-
-char *
-xf86strcpy(char * dest, const char * src)
-{
- return(strcpy(dest,src));
-}
-
-int
-xf86strcmp(const char * s1, const char * s2)
-{
- return(strcmp(s1,s2));
-}
-
-int
-xf86strncmp(const char * s1, const char * s2, INT32 n)
-{
- return(strncmp(s1,s2,n));
-}
-
-size_t
-xf86strlen(const char * s)
-{
- return(strlen(s));
-}
-
-void
-xf86getsecs(INT32 * secs, INT32 * usecs)
-{
- struct timeval tv;
-
- gettimeofday(&tv, NULL);
- *secs = tv.tv_sec;
- *usecs= tv.tv_usec;
-
- return;
-}
-
-double
-xf86exp(double x)
-{
- return(exp(x));
-}
-
-double
-xf86log(double x)
-{
- return(log(x));
-}
-
-double
-xf86pow(double x, double y)
-{
- return(pow(x,y));
-}
-
-double
-xf86sqrt(double x)
-{
- return(sqrt(x));
-}
-
-double
-xf86cos(double x)
-{
- return(cos(x));
-}
-
-
-
-
-$XFree86: xc/programs/Xserver/hw/xfree86/os-support/README.OS-lib,v 3.10 2001/12/17 20:00:45 dawes Exp $
-
-
-
-
-
-$XConsortium: README.OS-lib /main/5 1996/02/21 17:50:28 kaleb $