pcvesa.c File Reference

#include <freeldr.h>
#include <debug.h>
#include <pshpack2.h>
#include <poppack.h>

Include dependency graph for pcvesa.c:

Go to the source code of this file.

Classes
struct	VESA_SVGA_INFO

Typedefs
typedef struct VESA_SVGA_INFO *	PVESA_SVGA_INFO

Functions
	DBG_DEFAULT_CHANNEL (HWDETECT)
USHORT	BiosIsVesaSupported (VOID)
BOOLEAN	BiosIsVesaDdcSupported (VOID)
BOOLEAN	BiosVesaReadEdid (VOID)

Typedef Documentation

PVESA_SVGA_INFO

typedef struct VESA_SVGA_INFO * PVESA_SVGA_INFO

Function Documentation

BiosIsVesaDdcSupported()

BOOLEAN BiosIsVesaDdcSupported

(

VOID

)

Definition at line 242 of file pcvesa.c.

{
    REGS Regs;

    TRACE("BiosIsVesaDdcSupported()\n");

    Regs.w.ax = 0x4F15;
    Regs.b.bl = 0;
    Regs.w.cx = 0;
    Regs.w.es = 0;
    Regs.w.di = 0;
    Int386(0x10, &Regs, &Regs);

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

    TRACE("BL = 0x%x\n", Regs.b.bl);

    if (Regs.w.ax != 0x004F)
    {
        WARN("VBE/DDC Installation check function not supported (AL=0x%x) or failed (AH=0x%x)\n",
             Regs.b.al, Regs.b.ah);
        return FALSE;
    }

    return (Regs.b.ah == 0);
}

Referenced by DetectDisplayController().

BiosIsVesaSupported()

USHORT BiosIsVesaSupported

(

VOID

)

Definition at line 160 of file pcvesa.c.

{
    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)
    {
        WARN("VBE Get SuperVGA information function not supported (AL=0x%x) or failed (AH=0x%x)\n",
             Regs.b.al, Regs.b.ah);
        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;
}

Referenced by DetectDisplayController().

BiosVesaReadEdid()

BOOLEAN BiosVesaReadEdid

(

VOID

)

Definition at line 272 of file pcvesa.c.

{
    REGS Regs;

    TRACE("BiosVesaReadEdid()\n");

    RtlZeroMemory((PVOID)BIOSCALLBUFFER, 128);

    Regs.w.ax = 0x4F15;
    Regs.b.bl = 1;
    Regs.w.cx = 0;
    Regs.w.dx = 0;
    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)
    {
        WARN("VBE/DDC Read EDID function not supported (AL=0x%x) or failed (AH=0x%x)\n",
             Regs.b.al, Regs.b.ah);
        return FALSE;
    }

    return (Regs.b.ah == 0);
}

Referenced by DetectDisplayController().

DBG_DEFAULT_CHANNEL()

DBG_DEFAULT_CHANNEL

(

HWDETECT

)