/* * 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; }