112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
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/* $XdotOrg$ */
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/*
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* Copyrught 2005 Kean Johnston <jkj@sco.com>
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* Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany
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* Copyright 1993 by David Wexelblat <dwex@goblin.org>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the names of Thomas Roell, David Dawes
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* and Kean Johnston not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior permission.
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* Thomas Roell, David Dawes and Kean Johnston make no representations
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* about the suitability of this software for any purpose. It is provided
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* "as is" without express or implied warranty.
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*
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* THOMAS ROELL, DAVID DAWES AND KEAN JOHNSTON DISCLAIM ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THOMAS ROELLm DAVID WEXELBLAT
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* OR KEAN JOHNSTON BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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* THIS SOFTWARE.
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*
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*/
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/* $XConsortium$ */
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#include "X.h"
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#define _NEED_SYSI86
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#include "xf86.h"
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#include "xf86Priv.h"
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#include "xf86_OSlib.h"
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#include "xf86OSpriv.h"
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void *)-1)
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#endif
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static Bool
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linearVidMem(void)
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{
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return TRUE;
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}
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static pointer
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mapVidMem(int ScreenNum, unsigned long Base, unsigned long Size, int flags)
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{
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pointer base;
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int fd;
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fd = open(DEV_MEM, (flags & VIDMEM_READONLY) ? O_RDONLY : O_RDWR);
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if (fd < 0) {
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FatalError("xf86MapVidMem: failed to open %s (%s)\n",
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DEV_MEM, strerror(errno));
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}
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base = mmap((caddr_t)0, Size, (flags & VIDMEM_READONLY) ?
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PROT_READ : (PROT_READ | PROT_WRITE),
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MAP_SHARED, fd, (off_t)Base);
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close(fd);
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if (base == MAP_FAILED) {
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FatalError("%s: Could not mmap framebuffer [s=%x,a=%x] (%s)\n",
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"xf86MapVidMem", Size, Base, strerror(errno));
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}
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return(base);
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}
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/* ARGSUSED */
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static void
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unmapVidMem(int ScreenNum, pointer Base, unsigned long Size)
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{
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munmap(Base, Size);
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}
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/*
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* For some SVR4 versions, a 32-bit read is done for the first location
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* in each page when the page is first mapped. If this is done while
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* memory access is enabled for regions that have read side-effects,
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* this can cause unexpected results, including lockups on some hardware.
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* This function is called to make sure each page is mapped while it is
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* safe to do so.
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*/
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#define X_PAGE_SIZE 4096
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static void
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readSideEffects(int ScreenNum, pointer Base, unsigned long Size)
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{
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unsigned long base, end, addr;
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CARD32 val;
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base = (unsigned long)Base;
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end = base + Size;
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for (addr = base; addr < end; addr += X_PAGE_SIZE)
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val = *(volatile CARD32 *)addr;
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}
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void
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xf86OSInitVidMem(VidMemInfoPtr pVidMem)
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{
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pVidMem->linearSupported = linearVidMem();
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pVidMem->mapMem = mapVidMem;
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pVidMem->unmapMem = unmapVidMem;
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pVidMem->readSideEffects = readSideEffects;
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pVidMem->initialised = TRUE;
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}
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