diff options
Diffstat (limited to 'nx-X11/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c')
-rw-r--r-- | nx-X11/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/nx-X11/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c b/nx-X11/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c new file mode 100644 index 000000000..2c85ea92c --- /dev/null +++ b/nx-X11/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c @@ -0,0 +1,111 @@ +/* $XdotOrg: xc/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c,v 1.2 2005/11/08 06:33:30 jkj Exp $ */ +/* + * Copyrught 2005 Kean Johnston <jkj@sco.com> + * Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany + * Copyright 1993 by David Wexelblat <dwex@goblin.org> + * + * 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 names of Thomas Roell, David Dawes + * and Kean Johnston not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior permission. + * Thomas Roell, David Dawes and Kean Johnston make no representations + * about the suitability of this software for any purpose. It is provided + * "as is" without express or implied warranty. + * + * THOMAS ROELL, DAVID DAWES AND KEAN JOHNSTON DISCLAIM ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THOMAS ROELLm DAVID WEXELBLAT + * OR KEAN JOHNSTON 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. + * + */ +/* $XConsortium$ */ + +#include "X.h" + +#define _NEED_SYSI86 +#include "xf86.h" +#include "xf86Priv.h" +#include "xf86_OSlib.h" +#include "xf86OSpriv.h" + +#ifndef MAP_FAILED +#define MAP_FAILED ((void *)-1) +#endif + +static Bool +linearVidMem(void) +{ + return TRUE; +} + +static pointer +mapVidMem(int ScreenNum, unsigned long Base, unsigned long Size, int flags) +{ + pointer base; + int fd; + + fd = open(DEV_MEM, (flags & VIDMEM_READONLY) ? O_RDONLY : O_RDWR); + if (fd < 0) { + FatalError("xf86MapVidMem: failed to open %s (%s)\n", + DEV_MEM, strerror(errno)); + } + base = mmap((caddr_t)0, Size, (flags & VIDMEM_READONLY) ? + PROT_READ : (PROT_READ | PROT_WRITE), + MAP_SHARED, fd, (off_t)Base); + close(fd); + + if (base == MAP_FAILED) { + FatalError("%s: Could not mmap framebuffer [s=%x,a=%x] (%s)\n", + "xf86MapVidMem", Size, Base, strerror(errno)); + } + return(base); +} + +/* ARGSUSED */ +static void +unmapVidMem(int ScreenNum, pointer Base, unsigned long Size) +{ + munmap(Base, Size); +} + +/* + * For some SVR4 versions, a 32-bit read is done for the first location + * in each page when the page is first mapped. If this is done while + * memory access is enabled for regions that have read side-effects, + * this can cause unexpected results, including lockups on some hardware. + * This function is called to make sure each page is mapped while it is + * safe to do so. + */ + +#define X_PAGE_SIZE 4096 + +static void +readSideEffects(int ScreenNum, pointer Base, unsigned long Size) +{ + unsigned long base, end, addr; + CARD32 val; + + base = (unsigned long)Base; + end = base + Size; + + for (addr = base; addr < end; addr += X_PAGE_SIZE) + val = *(volatile CARD32 *)addr; +} + +void +xf86OSInitVidMem(VidMemInfoPtr pVidMem) +{ + pVidMem->linearSupported = linearVidMem(); + pVidMem->mapMem = mapVidMem; + pVidMem->unmapMem = unmapVidMem; + pVidMem->readSideEffects = readSideEffects; + pVidMem->initialised = TRUE; +} + |