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- Check VESA BIOS signature before reporting VESA extensions are present

svn path=/trunk/; revision=54260
This commit is contained in:
Cameron Gutman 2011-10-27 19:11:22 +00:00
parent c59fc2237c
commit 9485661218
1 changed files with 13 additions and 17 deletions
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30
reactos/boot/freeldr/freeldr/arch/i386/i386vid.c
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@ -205,7 +205,7 @@ USHORT BiosIsVesaSupported(VOID)
if (Regs.w.ax != 0x004F)
{
TRACE("Failed.\n");
ERR("VESA BIOS call failed\n");
return 0x0000;
}
@ -222,22 +222,18 @@ USHORT BiosIsVesaSupported(VOID)
TRACE("SvgaInfo->ProductRevisionStringPtr = 0x%x\n", SvgaInfo->ProductRevisionStringPtr);
TRACE("SvgaInfo->VBE/AF Version = 0x%x (BCD WORD)\n", SvgaInfo->VBE_AF_Version);
//TRACE("\nSupported VESA and OEM video modes:\n");
//VideoModes = (USHORT*)SvgaInfo->SupportedModeListPtr;
//for (Index=0; VideoModes[Index]!=0xFFFF; Index++)
//{
// TRACE("Mode %d: 0x%x\n", Index, VideoModes[Index]);
//}
//if (SvgaInfo->VesaVersion >= 0x0200)
//{
// TRACE("\nSupported accelerated video modes (VESA v2.0):\n");
// VideoModes = (USHORT*)SvgaInfo->AcceleratedModeListPtr;
// for (Index=0; VideoModes[Index]!=0xFFFF; Index++)
// {
// TRACE("Mode %d: 0x%x\n", Index, VideoModes[Index]);
// }
//}
if (SvgaInfo->Signature[0] != 'V' ||
SvgaInfo->Signature[1] != 'E' ||
SvgaInfo->Signature[2] != 'S' ||
SvgaInfo->Signature[3] != 'A')
{
ERR("Bad signature in VESA information (%c%c%c%c)\n",
SvgaInfo->Signature[0],
SvgaInfo->Signature[1],
SvgaInfo->Signature[2],
SvgaInfo->Signature[3]);
return 0x0000;
}
return SvgaInfo->VesaVersion;
}