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Make sure the compiler doesn't optimize away writes to video memory

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svn path=/trunk/; revision=24473
This commit is contained in:
Thomas Bluemel 2006-10-09 16:37:27 +00:00
parent 8a80403d2a
commit ca392ef651
1 changed files with 6 additions and 7 deletions
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13
reactos/drivers/base/bootvid/vid_vgatext.c
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@ -61,7 +61,7 @@ static ULONG SizeX, SizeY;
static VOID NTAPI
VidpVgaTextClearDisplay(VOID)
{
WORD *ptr = (WORD*)VidpMemory;
volatile WORD *ptr = (volatile WORD*)VidpMemory;
ULONG i;
for (i = 0; i < SizeX * SizeY; i++, ptr++)
@ -166,13 +166,12 @@ VidVgaTextSolidColorFill(
static VOID NTAPI
VidpVgaTextScrollDisplay(VOID)
{
PUSHORT ptr;
volatile USHORT *ptr;
int i;
ptr = (PUSHORT)VidpMemory + SizeX;
RtlMoveMemory(VidpMemory, ptr, SizeX * (SizeY - 1) * 2);
RtlMoveMemory(VidpMemory, (PUSHORT)VidpMemory + SizeX, SizeX * (SizeY - 1) * 2);
ptr = (PUSHORT)VidpMemory + (SizeX * (SizeY - 1));
ptr = (volatile USHORT *)VidpMemory + (SizeX * (SizeY - 1));
for (i = 0; i < (int)SizeX; i++, ptr++)
*ptr = (CHAR_ATTRIBUTE << 8) + ' ';
}
@ -210,9 +209,9 @@ VidVgaTextDisplayString(
}
else if (*pch != '\r')
{
PUSHORT ptr;
volatile USHORT *ptr;
ptr = (PUSHORT)VidpMemory + ((CursorY * SizeX) + CursorX);
ptr = (volatile USHORT *)VidpMemory + ((CursorY * SizeX) + CursorX);
*ptr = (CHAR_ATTRIBUTE << 8) + *pch;
CursorX++;