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[NTVDM]: Add a common helper to sync the BIOS cursor for the active display page, with VGA.

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svn path=/branches/ntvdm/; revision=62409
This commit is contained in:
Hermès Bélusca-Maïto 2014-03-03 00:09:22 +00:00
parent 667b254535
commit 7a52bcd33a
2 changed files with 26 additions and 23 deletions
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47
subsystems/ntvdm/bios/vidbios.c
View file

@ -880,24 +880,6 @@ static VOID VgaChangePalette(BYTE ModeNumber)
VgaSetPalette(Palette, Size);
}
static VOID VgaGetCursorPosition(PBYTE Row, PBYTE Column)
{
SHORT ScreenColumns = VgaGetDisplayResolution().X;
BYTE OffsetLow, OffsetHigh;
WORD Offset;
/* Get the cursor location */
IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
OffsetLow = IOReadB(VGA_CRTC_DATA);
IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
OffsetHigh = IOReadB(VGA_CRTC_DATA);
Offset = MAKEWORD(OffsetLow, OffsetHigh);
*Row = (BYTE)(Offset / ScreenColumns);
*Column = (BYTE)(Offset % ScreenColumns);
}
static VOID VidBiosGetCursorPosition(PBYTE Row, PBYTE Column, BYTE Page)
{
/* Make sure the selected video page is valid */
@ -929,6 +911,28 @@ static VOID VidBiosSetCursorPosition(BYTE Row, BYTE Column, BYTE Page)
}
}
VOID VidBiosSyncCursorPosition(VOID)
{
BYTE Row, Column;
BYTE Low, High;
SHORT ScreenColumns = VgaGetDisplayResolution().X;
WORD Offset;
/* Get the cursor location */
IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_LOW_REG);
Low = IOReadB(VGA_CRTC_DATA);
IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_LOC_HIGH_REG);
High = IOReadB(VGA_CRTC_DATA);
Offset = MAKEWORD(Low, High);
Row = (BYTE)(Offset / ScreenColumns);
Column = (BYTE)(Offset % ScreenColumns);
/* Synchronize our cursor position with VGA */
VidBiosSetCursorPosition(Row, Column, Bda->VideoPage);
}
BYTE VidBiosGetVideoMode(VOID)
{
return Bda->VideoMode;
@ -1530,8 +1534,6 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
BOOLEAN VidBiosInitialize(VOID)
{
BYTE Row, Column;
/* Some interrupts are in fact addresses to tables */
((PULONG)BaseAddress)[0x1D] = (ULONG)NULL;
((PULONG)BaseAddress)[0x1F] = (ULONG)NULL;
@ -1542,9 +1544,8 @@ BOOLEAN VidBiosInitialize(VOID)
/* Set the default video mode */
VidBiosSetVideoMode(BIOS_DEFAULT_VIDEO_MODE);
/* Update cursor position */
VgaGetCursorPosition(&Row, &Column);
VidBiosSetCursorPosition(Row, Column, Bda->VideoPage);
/* Synchronize our cursor position with VGA */
VidBiosSyncCursorPosition();
/* Register the BIOS support BOPs */
RegisterBop(BOP_VIDEO_INT, VidBiosVideoService);

2
subsystems/ntvdm/bios/vidbios.h
View file

@ -39,6 +39,8 @@ enum
VOID WINAPI VidBiosVideoService(LPWORD Stack);
VOID VidBiosSyncCursorPosition(VOID);
BOOLEAN VidBiosInitialize(VOID);
VOID VidBiosCleanup(VOID);