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/*
* Copyright 2001 Ani Joshi <ajoshi@unixbox.com>
*
* XFree86 4.x driver for S3 chipsets
*
*
* 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 Ani Joshi not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Ani Joshi makes no representations
* about the suitability of this software for any purpose. It is provided
* "as-is" without express or implied warranty.
*
* ANI JOSHI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL ANI JOSHI 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.
*
*
*/
/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/s3/s3_bios.c,v 1.3 2002/01/25 21:56:08 tsi Exp $ */
#include "xf86.h"
#include "xf86_OSproc.h"
#include "xf86_ansic.h"
#include "compiler.h"
#include "s3.h"
static unsigned char *find_bios_string(S3Ptr pS3, int BIOSbase,
char *match1, char *match2)
{
static unsigned char bios[BIOS_BSIZE];
static int init=0;
int i, j, l1, l2;
if (!init) {
init = 1;
if (xf86ReadDomainMemory(pS3->PciTag, BIOSbase, BIOS_BSIZE, bios) != BIOS_BSIZE)
return NULL;
if ((bios[0] != 0x55) || (bios[1] != 0xaa))
return NULL;
}
if (match1 == NULL)
return NULL;
l1 = strlen(match1);
if (match2 != NULL)
l2 = strlen(match2);
else
l2 = 0;
for (i=0; i<BIOS_BSIZE; i++)
if (bios[i] == match1[0] && !memcmp(&bios[i], match1, l1)) {
if (match2 == NULL)
return &bios[i+l1];
else
for(j=i+l1; (j<BIOS_BSIZE-l2) && bios[j]; j++)
if (bios[j] == match2[0] &&
!memcmp(&bios[j], match2, l2))
return &bios[j+l2];
}
return NULL;
}
int S3GetRefClock(ScrnInfoPtr pScrn)
{
S3Ptr pS3 = S3PTR(pScrn);
int RefClock = 16000; /* default */
if (find_bios_string(pS3, BIOS_BASE, "Number Nine Visual Technology",
"Motion 771") != NULL)
RefClock = 16000;
return RefClock;
}
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