USHORT BiosIsVesaSupported ( VOID )
Definition at line 162 of file i386vid.c.
Referenced by DetectDisplayController().
{
    REGS            Regs;
    PVESA_SVGA_INFO SvgaInfo = (PVESA_SVGA_INFO)BIOSCALLBUFFER;
    //USHORT*           VideoModes;
    //USHORT            Index;

    TRACE("BiosIsVesaSupported()\n");

    RtlZeroMemory(SvgaInfo, sizeof(VESA_SVGA_INFO));

    // Make sure we receive version 2.0 info
    SvgaInfo->Signature[0] = 'V';
    SvgaInfo->Signature[1] = 'B';
    SvgaInfo->Signature[2] = 'E';
    SvgaInfo->Signature[3] = '2';

    // Int 10h AX=4F00h
    // VESA SuperVGA BIOS (VBE) - GET SuperVGA INFORMATION
    //
    // AX = 4F00h
    // ES:DI -> buffer for SuperVGA information (see #00077)
    // Return:
    // AL = 4Fh if function supported
    // AH = status
    //   00h successful
    // ES:DI buffer filled
    //   01h failed
    //   ---VBE v2.0---
    //   02h function not supported by current hardware configuration
    //   03h function invalid in current video mode
    //
    // Determine whether VESA BIOS extensions are present and the
    // capabilities supported by the display adapter
    //
    // Installation check;VESA SuperVGA
    Regs.w.ax = 0x4F00;
    Regs.w.es = BIOSCALLBUFSEGMENT;
    Regs.w.di = BIOSCALLBUFOFFSET;
    Int386(0x10, &Regs, &Regs);

    TRACE("AL = 0x%x\n", Regs.b.al);
    TRACE("AH = 0x%x\n", Regs.b.ah);

    if (Regs.w.ax != 0x004F)
    {
        ERR("VESA BIOS call failed\n");
        return 0x0000;
    }

    TRACE("Supported.\n");
    TRACE("SvgaInfo->Signature[4] = %c%c%c%c\n", SvgaInfo->Signature[0], SvgaInfo->Signature[1], SvgaInfo->Signature[2], SvgaInfo->Signature[3]);
    TRACE("SvgaInfo->VesaVersion = v%d.%d\n", ((SvgaInfo->VesaVersion >> 8) & 0xFF), (SvgaInfo->VesaVersion & 0xFF));
    TRACE("SvgaInfo->OemNamePtr = 0x%x\n", SvgaInfo->OemNamePtr);
    TRACE("SvgaInfo->Capabilities = 0x%x\n", SvgaInfo->Capabilities);
    TRACE("SvgaInfo->VideoMemory = %dK\n", SvgaInfo->TotalVideoMemory * 64);
    TRACE("---VBE v2.0 ---\n");
    TRACE("SvgaInfo->OemSoftwareVersion = v%d.%d\n", ((SvgaInfo->OemSoftwareVersion >> 8) & 0x0F) + (((SvgaInfo->OemSoftwareVersion >> 12) & 0x0F) * 10), (SvgaInfo->OemSoftwareVersion & 0x0F) + (((SvgaInfo->OemSoftwareVersion >> 4) & 0x0F) * 10));
    TRACE("SvgaInfo->VendorNamePtr = 0x%x\n", SvgaInfo->VendorNamePtr);
    TRACE("SvgaInfo->ProductNamePtr = 0x%x\n", SvgaInfo->ProductNamePtr);
    TRACE("SvgaInfo->ProductRevisionStringPtr = 0x%x\n", SvgaInfo->ProductRevisionStringPtr);
    TRACE("SvgaInfo->VBE/AF Version = 0x%x (BCD WORD)\n", SvgaInfo->VBE_AF_Version);

    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;
}
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