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[NTVDM:BIOS]

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Implement VESA function AH = 07h.


svn path=/trunk/; revision=72516
This commit is contained in:
Aleksandar Andrejevic
2016-08-30 22:52:49 +00:00
parent 622507d06f
commit 81b5e2b655
1 changed files with 98 additions and 0 deletions
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98
reactos/subsystems/mvdm/ntvdm/bios/bios32/vbe.c
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@@ -653,6 +653,104 @@ VOID WINAPI VbeService(LPWORD Stack)
break;
}
/* Get/Set Display Start */
case 0x07:
{
DWORD StartAddress;
BYTE Value;
PCVBE_MODE Mode = VbeGetModeByNumber(Bda->VideoMode);
BYTE OldCrtcIndex = IOReadB(VGA_CRTC_INDEX_COLOR);
if (getBL() & 0x80)
{
/* Wait for a vertical retrace */
if (!(IOReadB(VGA_INSTAT1_READ_COLOR) & VGA_STAT_VRETRACE))
{
setCF(1);
break;
}
setCF(0);
}
switch (getBL() & 0x7F)
{
/* Set Display Start */
case 0x00:
{
setAL(0x4F);
if (Mode == NULL || Mode->Info == NULL)
{
/* This is not a VBE mode */
// TODO: Support anyway, perhaps? It can be done.
setAH(0x01);
break;
}
StartAddress = getCX() + getDX() * Mode->Info->BytesPerScanline;
IOWriteB(VGA_CRTC_INDEX_COLOR, SVGA_CRTC_OVERLAY_REG);
Value = IOReadB(VGA_CRTC_DATA_COLOR);
Value &= ~SVGA_CRTC_EXT_ADDR_BIT19;
Value |= (StartAddress >> 12) & SVGA_CRTC_EXT_ADDR_BIT19;
IOWriteB(VGA_CRTC_DATA_COLOR, Value);
IOWriteB(VGA_CRTC_INDEX_COLOR, SVGA_CRTC_EXT_DISPLAY_REG);
Value = IOReadB(VGA_CRTC_DATA_COLOR);
Value &= ~(SVGA_CRTC_EXT_ADDR_BIT16 | SVGA_CRTC_EXT_ADDR_BITS1718);
Value |= (StartAddress >> 16) & SVGA_CRTC_EXT_ADDR_BIT16;
Value |= (StartAddress >> 15) & SVGA_CRTC_EXT_ADDR_BITS1718;
IOWriteB(VGA_CRTC_DATA_COLOR, Value);
IOWriteB(VGA_CRTC_INDEX_COLOR, VGA_CRTC_START_ADDR_HIGH_REG);
IOWriteB(VGA_CRTC_DATA_COLOR, (StartAddress >> 8) & 0xFF);
IOWriteB(VGA_CRTC_INDEX_COLOR, VGA_CRTC_START_ADDR_LOW_REG);
IOWriteB(VGA_CRTC_DATA_COLOR, StartAddress & 0xFF);
setAH(0);
break;
}
/* Get Display Start */
case 0x01:
{
setAL(0x4F);
StartAddress = 0;
if (Mode == NULL || Mode->Info == NULL)
{
/* This is not a VBE mode */
// TODO: Support anyway, perhaps? It can be done.
setAH(0x01);
break;
}
IOWriteB(VGA_CRTC_INDEX_COLOR, SVGA_CRTC_OVERLAY_REG);
StartAddress = (IOReadB(VGA_CRTC_DATA_COLOR) & SVGA_CRTC_EXT_ADDR_BIT19) << 12;
IOWriteB(VGA_CRTC_INDEX_COLOR, SVGA_CRTC_EXT_DISPLAY_REG);
Value = IOReadB(VGA_CRTC_DATA_COLOR);
StartAddress |= (Value & SVGA_CRTC_EXT_ADDR_BIT16) << 16;
StartAddress |= (Value & SVGA_CRTC_EXT_ADDR_BITS1718) << 15;
IOWriteB(VGA_CRTC_INDEX_COLOR, VGA_CRTC_START_ADDR_HIGH_REG);
StartAddress |= IOReadB(VGA_CRTC_DATA_COLOR) << 8;
IOWriteB(VGA_CRTC_INDEX_COLOR, VGA_CRTC_START_ADDR_LOW_REG);
StartAddress |= IOReadB(VGA_CRTC_DATA_COLOR);
setCX(StartAddress % Mode->Info->BytesPerScanline);
setDX(StartAddress / Mode->Info->BytesPerScanline);
setAH(0);
break;
}
}
IOWriteB(VGA_CRTC_INDEX_COLOR, OldCrtcIndex);
break;
}
default:
{
DPRINT1("VESA BIOS Extensions function %02Xh NOT IMPLEMENTED!\n", getAL());