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[NTVDM]

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Fix host-to-VGA address translation.


svn path=/trunk/; revision=67280
This commit is contained in:
Aleksandar Andrejevic
2015-04-18 22:00:44 +00:00
parent f033a19054
commit f6e7bd7e87
1 changed files with 6 additions and 12 deletions
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reactos/subsystems/mvdm/ntvdm/hardware/video/vga.c
+6 -12
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@@ -629,13 +629,13 @@ static inline DWORD VgaTranslateReadAddress(DWORD Address)
{
/* The lowest two bits are the plane number */
Plane = Offset & 0x03;
Offset >>= 2;
Offset &= ~3;
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
/* The LSB is the plane number */
Plane = Offset & 0x01;
Offset >>= 1;
Offset &= ~1;
}
else
{
@@ -643,9 +643,6 @@ static inline DWORD VgaTranslateReadAddress(DWORD Address)
Plane = VgaGcRegisters[VGA_GC_READ_MAP_SEL_REG] & 0x03;
}
/* Multiply the offset by the address size */
Offset *= VgaGetAddressSize();
return Offset + Plane * VGA_BANK_SIZE;
}
@@ -656,18 +653,15 @@ static inline DWORD VgaTranslateWriteAddress(DWORD Address)
/* Check for chain-4 and odd-even mode */
if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
{
/* Shift the offset to the right by 2 */
Offset >>= 2;
/* Clear the lowest two bits since they're used to select the bank */
Offset &= ~3;
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
/* Shift the offset to the right by 1 */
Offset >>= 1;
/* Clear the lowest bit since it's used to select odd/even */
Offset &= ~1;
}
/* Multiply the offset by the address size */
Offset *= VgaGetAddressSize();
/* Return the offset on plane 0 */
return Offset;
}