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[NTVDM:BIOS]

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Implement VBE function AH = 0x05, "CPU Video Memory Control".


svn path=/trunk/; revision=72451
This commit is contained in:
Aleksandar Andrejevic 2016-08-25 03:01:18 +00:00
parent e145ed06c6
commit e7339745af
1 changed files with 47 additions and 0 deletions
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47
reactos/subsystems/mvdm/ntvdm/bios/bios32/vbe.c
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@ -525,6 +525,53 @@ VOID WINAPI VbeService(LPWORD Stack)
break;
}
/* CPU Video Memory Control */
case 0x05:
{
BYTE Window = getBL();
BYTE OldGcIndex = IOReadB(VGA_GC_INDEX);
switch (getBH())
{
/* Select Memory Window */
case 0:
{
setAL(0x4F);
if (getDH() != 0)
{
/* Offset too high */
setAH(1);
break;
}
IOWriteB(VGA_GC_INDEX, (Window == 0) ? SVGA_GC_OFFSET_0_REG : SVGA_GC_OFFSET_1_REG);
IOWriteB(VGA_GC_DATA, getDL());
setAH(0);
break;
}
/* Return Memory Window */
case 1:
{
IOWriteB(VGA_GC_INDEX, (Window == 0) ? SVGA_GC_OFFSET_0_REG : SVGA_GC_OFFSET_1_REG);
setDX(IOReadB(VGA_GC_DATA));
setAX(0x004F);
break;
}
default:
{
DPRINT("VESA INT 0x10, AH = 0x05, Unknown subfunction: %02X", getBH());
}
}
IOWriteB(VGA_GC_INDEX, OldGcIndex);
break;
}
default:
{
DPRINT1("VESA BIOS Extensions function %02Xh NOT IMPLEMENTED!\n", getAL());