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/*
* 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.
*
*/
#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;
}
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