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[NTVDM]
- Remove some old comments (and commented DPRINTs); - More support for Bda->VGAOptions; - Improve implementation of VidBiosSetCursorShape (start some cursor emulation, and add a note about it); - Implement few "Alternate Function Select" subfunctions. svn path=/trunk/; revision=65421
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Hermès Bélusca-Maïto
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2577b38332
commit
4a12998fb3
1 changed files with 144 additions and 30 deletions
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@ -50,7 +50,7 @@ static VGA_REGISTERS VideoMode_40x25_text =
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/* Sequencer Registers */
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{0x00, 0x08, 0x03, 0x00, 0x02},
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/* CRTC Registers */
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/* CRTC Registers */ /* CGA-compatible: 0xC7, 0x06, 0x07 */
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{0x2D, 0x27, 0x28, 0x90, 0x2B, 0xA0, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
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0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x1F, 0x96, 0xB9, 0xA3,
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0xFF},
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@ -71,7 +71,7 @@ static VGA_REGISTERS VideoMode_80x25_text =
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/* Sequencer Registers */
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{0x00, 0x00, 0x03, 0x00, 0x02},
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/* CRTC Registers */
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/* CRTC Registers */ /* CGA-compatible: 0xC7, 0x06, 0x07 */
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{0x5F, 0x4F, 0x50, 0x82, 0x55, 0x81, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
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0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x1F, 0x96, 0xB9, 0xA3,
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0xFF},
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@ -2100,19 +2100,25 @@ static BOOLEAN VgaSetRegisters(PVGA_REGISTERS Registers)
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*/
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Bda->CrtBasePort = (Registers->Misc & 0x01) ? VGA_CRTC_INDEX_COLOR
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: VGA_CRTC_INDEX_MONO;
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/* Bit 1 indicates whether display is color (0) or monochrome (1) */
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Bda->VGAOptions = (Bda->VGAOptions & 0xFD) | (!(Registers->Misc & 0x01) << 1);
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/* Turn the video off */
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IOWriteB(VGA_SEQ_INDEX, VGA_SEQ_CLOCK_REG);
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IOWriteB(VGA_SEQ_DATA , IOReadB(VGA_SEQ_DATA) | VGA_SEQ_CLOCK_SD);
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/* Write the misc register */
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IOWriteB(VGA_MISC_WRITE, Registers->Misc);
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/* Synchronous reset on */
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IOWriteB(VGA_SEQ_INDEX, VGA_SEQ_RESET_REG);
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IOWriteB(VGA_SEQ_DATA , VGA_SEQ_RESET_AR);
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IOWriteB(VGA_SEQ_DATA , VGA_SEQ_RESET_AR );
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/* Write the sequencer registers */
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for (i = 1; i < VGA_SEQ_MAX_REG; i++)
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{
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IOWriteB(VGA_SEQ_INDEX, i);
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IOWriteB(VGA_SEQ_DATA, Registers->Sequencer[i]);
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IOWriteB(VGA_SEQ_DATA , Registers->Sequencer[i]);
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}
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/* Synchronous reset off */
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@ -2121,9 +2127,9 @@ static BOOLEAN VgaSetRegisters(PVGA_REGISTERS Registers)
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/* Unlock CRTC registers 0-7 */
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IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_END_HORZ_BLANKING_REG);
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IOWriteB(VGA_CRTC_DATA, IOReadB(VGA_CRTC_DATA) | 0x80);
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IOWriteB(VGA_CRTC_DATA , IOReadB(VGA_CRTC_DATA) | 0x80);
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IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_VERT_RETRACE_END_REG);
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IOWriteB(VGA_CRTC_DATA, IOReadB(VGA_CRTC_DATA) & ~0x80);
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IOWriteB(VGA_CRTC_DATA , IOReadB(VGA_CRTC_DATA) & ~0x80);
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// Make sure they remain unlocked
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Registers->CRT[VGA_CRTC_END_HORZ_BLANKING_REG] |= 0x80;
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Registers->CRT[VGA_CRTC_VERT_RETRACE_END_REG] &= ~0x80;
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@ -2132,24 +2138,21 @@ static BOOLEAN VgaSetRegisters(PVGA_REGISTERS Registers)
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for (i = 0; i < VGA_CRTC_MAX_REG; i++)
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{
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IOWriteB(VGA_CRTC_INDEX, i);
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IOWriteB(VGA_CRTC_DATA, Registers->CRT[i]);
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IOWriteB(VGA_CRTC_DATA , Registers->CRT[i]);
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}
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/* Write the GC registers */
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for (i = 0; i < VGA_GC_MAX_REG; i++)
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{
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IOWriteB(VGA_GC_INDEX, i);
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IOWriteB(VGA_GC_DATA, Registers->Graphics[i]);
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IOWriteB(VGA_GC_DATA , Registers->Graphics[i]);
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}
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/* Write the AC registers */
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// DbgPrint("\n");
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for (i = 0; i < VGA_AC_MAX_REG; i++)
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{
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VgaSetSinglePaletteRegister(i, Registers->Attribute[i]);
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// DbgPrint("Registers->Attribute[%d] = %d\n", i, Registers->Attribute[i]);
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}
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// DbgPrint("\n");
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/* Set the PEL mask */
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IOWriteB(VGA_DAC_MASK, 0xFF);
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@ -2158,6 +2161,10 @@ static BOOLEAN VgaSetRegisters(PVGA_REGISTERS Registers)
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IOReadB(VGA_INSTAT1_READ); // Put the AC register into index state
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IOWriteB(VGA_AC_INDEX, 0x20);
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/* Turn the video on */
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IOWriteB(VGA_SEQ_INDEX, VGA_SEQ_CLOCK_REG);
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IOWriteB(VGA_SEQ_DATA , IOReadB(VGA_SEQ_DATA) & ~VGA_SEQ_CLOCK_SD);
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/* Enable interrupts */
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setIF(1);
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@ -2263,6 +2270,53 @@ static VOID VidBiosSetCursorPosition(BYTE Row, BYTE Column, BYTE Page)
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}
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}
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static VOID VidBiosSetCursorShape(WORD CursorStartEnd)
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{
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/* Only valid in text-mode */
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if ((Bda->VideoMode > 0x03) && (Bda->VideoMode != 0x07)) return;
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/* Update the BDA */
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Bda->CursorStartLine = HIBYTE(CursorStartEnd) & 0x1F;
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Bda->CursorEndLine = LOBYTE(CursorStartEnd) & 0x1F;
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/*
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* In cursor emulation mode, we suppose the cursor scanlines
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* to be in CGA mode, so that we need to adjust them
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*
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* WARNING!!
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* =========
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* Contrary to what is mentioned in lots of literature out there, e.g. in:
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* http://webpages.charter.net/danrollins/techhelp/0072.HTM
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* http://www.bioscentral.com/misc/bda.htm
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* and in other various places, bit 0 of Bda->VGAOptions is 0 when
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* cursor emulation is ENABLED, and is 1 when it is DISABLED.
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*
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* The following documentation is right about this fact:
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* http://www.cs.nyu.edu/~mwalfish/classes/ut/s12-cs372h/ref/hardware/vgadoc/VGABIOS.TXT
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* https://sites.google.com/site/pcdosretro/biosdata
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*
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* A proof that it is OK is that in the following code samples it is
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* explicitely mentioned that setting bit 0 disables cursor emulation:
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* - Code snippets in PC Magazine vol.5 num.15 of 16/09/1986, p.291-292;
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* - CardFile DOS utility (Jeff Prosise, PC Magazine vol.6 num.17 of 13/10/1987, p.403-416):
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* https://ia600700.us.archive.org/1/items/srccode-00000020/cardfile.asm.txt
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* (function 'show_cursor', "or ega_info,1 ;disable EGA cursor emulation")
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*/
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if (!(Bda->VGAOptions & 0x01))
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{
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// HACK: Quick "fix" for cursor scanline adjustment. This must be reworked.
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DPRINT1("HACK: Using HACK for cursor scanlines adjustment\n");
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CursorStartEnd = MAKEWORD((LOBYTE(CursorStartEnd) & 0x1F) * 2,
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(HIBYTE(CursorStartEnd) & 0x1F) * 2 | (HIBYTE(CursorStartEnd) & 0xE0));
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}
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/* Modify the CRTC registers */
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IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_START_REG);
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IOWriteB(VGA_CRTC_DATA , HIBYTE(CursorStartEnd));
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IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_END_REG);
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IOWriteB(VGA_CRTC_DATA , LOBYTE(CursorStartEnd));
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}
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VOID VidBiosSyncCursorPosition(VOID)
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{
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BYTE Row, Column;
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@ -2340,7 +2394,7 @@ static BOOLEAN VidBiosSetVideoMode(BYTE ModeNumber)
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Bda->VideoPageOffset = Bda->VideoPage * Bda->VideoPageSize;
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/* 256 KB Video RAM; set bit 7 if we do not clear the screen */
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Bda->VGAOptions = 0x60 | (DoNotClear ? 0x80 : 0x00);
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Bda->VGAOptions = 0x60 | (Bda->VGAOptions & 0x7F) | (DoNotClear ? 0x80 : 0x00);
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Bda->VGASwitches = 0xF9; /* High-resolution */
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/* Set the start address in the CRTC */
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@ -2358,6 +2412,15 @@ static BOOLEAN VidBiosSetVideoMode(BYTE ModeNumber)
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Bda->ScreenColumns = Resolution.X;
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Bda->ScreenRows = Resolution.Y - 1;
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/*
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* Update the cursor shape (text-mode only).
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* Use the default CGA cursor scanline values,
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* see: http://vitaly_filatov.tripod.com/ng/asm/asm_023.2.html
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*/
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if ((ModeNumber >= 0x00 && ModeNumber <= 0x03) || (ModeNumber == 0x07))
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// FIXME: we might read the CRT registers and do the adjustment?
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VidBiosSetCursorShape(MAKEWORD(0x07, 0x06));
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/* Set the cursor position for each page */
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for (Page = 0; Page < BIOS_MAX_PAGES; ++Page)
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VidBiosSetCursorPosition(0, 0, Page);
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@ -2519,18 +2582,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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/* Set Text-Mode Cursor Shape */
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case 0x01:
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{
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WORD CursorStartEnd = getCX();
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/* Update the BDA */
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Bda->CursorStartLine = HIBYTE(CursorStartEnd) & 0x1F;
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Bda->CursorEndLine = LOBYTE(CursorStartEnd) & 0x1F;
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/* Modify the CRTC registers */
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IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_START_REG);
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IOWriteB(VGA_CRTC_DATA , HIBYTE(CursorStartEnd));
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IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_END_REG);
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IOWriteB(VGA_CRTC_DATA , Bda->CursorEndLine);
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VidBiosSetCursorShape(getCX());
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break;
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}
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@ -2548,7 +2600,6 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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if (getBH() >= BIOS_MAX_PAGES) break;
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/* Return the result */
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setAX(0);
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setCX(MAKEWORD(Bda->CursorEndLine, Bda->CursorStartLine));
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setDX(Bda->CursorPosition[getBH()]);
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break;
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@ -2650,7 +2701,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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/* Set Video Colors */
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case 0x0B:
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{
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if (Bda->VideoMode < 4 || Bda->VideoMode > 6)
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if (Bda->VideoMode < 0x04 || Bda->VideoMode > 0x06)
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{
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DPRINT1("BIOS Function INT 10h, AH = 0Bh, BH = 0x%02X is unsupported for non-CGA modes\n",
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getBH());
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@ -2673,7 +2724,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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VgaSetSinglePaletteRegister(VGA_AC_OVERSCAN_REG, Index);
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/* Don't set any extra colors when in text mode */
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if (Bda->VideoMode <= 3) break;
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if (Bda->VideoMode <= 0x03) break;
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VgaSetSinglePaletteRegister(0x00, Index);
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@ -2704,7 +2755,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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Bda->CrtColorPaletteMask = (Bda->CrtColorPaletteMask & 0xDF) | ((Index & 1) ? 0x20 : 0x00);
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/* Don't set any extra colors when in text mode */
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if (Bda->VideoMode <= 3) break;
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if (Bda->VideoMode <= 0x03) break;
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Index = (Bda->CrtColorPaletteMask & 0x10) | 0x02 | Index;
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@ -3051,8 +3102,71 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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/* Alternate Function Select */
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case 0x12:
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{
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DPRINT1("BIOS Function INT 10h, AH = 12h (Alternate Function Select), BX = 0x%04X NOT IMPLEMENTED\n",
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getBX());
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switch (getBL())
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{
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/* Get EGA/VGA Information */
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case 0x10:
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{
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setBH((Bda->VGAOptions & 0x02) >> 1); /* Color (0) or monochrome (1) display */
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setBL((Bda->VGAOptions & 0x60) >> 5); /* Video RAM size */
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setCH((Bda->VGASwitches & 0xF0) >> 4); /* Features settings */
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setCL( Bda->VGASwitches & 0x0F); /* Switches settings */
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break;
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}
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/* Enable/Disable Cursor Emulation */
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case 0x34:
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{
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BYTE State = getAL();
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/* Check for validity */
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if (State > 1) break;
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/*
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* Enable (State == 0) or disable (State == 1) cursor emulation.
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* Please read the WARNING in the 'VidBiosSetCursorShape'
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* function for more details.
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*/
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Bda->VGAOptions = (Bda->VGAOptions & 0xFE) | (State & 0x01);
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/* Return success */
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setAL(0x12);
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break;
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}
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/* Enable/Disable screen refresh */
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case 0x36:
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{
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BYTE State = getAL();
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BYTE Clocking;
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/* Check for validity */
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if (State > 1) break;
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/* Turn the video on (State == 0) or off (State == 1) */
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IOWriteB(VGA_SEQ_INDEX, VGA_SEQ_CLOCK_REG);
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Clocking = IOReadB(VGA_SEQ_DATA);
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if (State == 0)
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Clocking &= ~VGA_SEQ_CLOCK_SD;
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else
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Clocking |= VGA_SEQ_CLOCK_SD;
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IOWriteB(VGA_SEQ_DATA, Clocking);
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/* Return success */
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setAL(0x12);
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break;
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}
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default:
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{
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DPRINT1("BIOS Function INT 10h, AH = 12h (Alternate Function Select), BX = 0x%04X NOT IMPLEMENTED\n",
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getBX());
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break;
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}
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}
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break;
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}
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