16 Nov
2014
16 Nov
'14
4:01 p.m.
Author: hbelusca
Date: Sun Nov 16 16:01:09 2014
New Revision: 65421
URL: http://svn.reactos.org/svn/reactos?rev=65421&view=rev
Log:
[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.
Modified:
trunk/reactos/subsystems/ntvdm/bios/vidbios.c
Modified: trunk/reactos/subsystems/ntvdm/bios/vidbios.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/ntvdm/bios/vidb…
==============================================================================
--- trunk/reactos/subsystems/ntvdm/bios/vidbios.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/ntvdm/bios/vidbios.c [iso-8859-1] Sun Nov 16 16:01:09 2014
@@ -50,7 +50,7 @@
/* Sequencer Registers */
{0x00, 0x08, 0x03, 0x00, 0x02},
- /* CRTC Registers */
+ /* CRTC Registers */ /* CGA-compatible: 0xC7, 0x06, 0x07 */
{0x2D, 0x27, 0x28, 0x90, 0x2B, 0xA0, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x14, 0x1F, 0x96, 0xB9, 0xA3,
0xFF},
@@ -71,7 +71,7 @@
/* Sequencer Registers */
{0x00, 0x00, 0x03, 0x00, 0x02},
- /* CRTC Registers */
+ /* CRTC Registers */ /* CGA-compatible: 0xC7, 0x06, 0x07 */
{0x5F, 0x4F, 0x50, 0x82, 0x55, 0x81, 0xBF, 0x1F, 0x00, 0x4F, 0x0D, 0x0E,
0x00, 0x00, 0x00, 0x00, 0x9C, 0x8E, 0x8F, 0x28, 0x1F, 0x96, 0xB9, 0xA3,
0xFF},
@@ -2100,19 +2100,25 @@
*/
Bda->CrtBasePort = (Registers->Misc & 0x01) ? VGA_CRTC_INDEX_COLOR
: VGA_CRTC_INDEX_MONO;
+ /* Bit 1 indicates whether display is color (0) or monochrome (1) */
+ Bda->VGAOptions = (Bda->VGAOptions & 0xFD) | (!(Registers->Misc &
0x01) << 1);
+
+ /* Turn the video off */
+ IOWriteB(VGA_SEQ_INDEX, VGA_SEQ_CLOCK_REG);
+ IOWriteB(VGA_SEQ_DATA , IOReadB(VGA_SEQ_DATA) | VGA_SEQ_CLOCK_SD);
/* Write the misc register */
IOWriteB(VGA_MISC_WRITE, Registers->Misc);
/* Synchronous reset on */
IOWriteB(VGA_SEQ_INDEX, VGA_SEQ_RESET_REG);
- IOWriteB(VGA_SEQ_DATA , VGA_SEQ_RESET_AR);
+ IOWriteB(VGA_SEQ_DATA , VGA_SEQ_RESET_AR );
/* Write the sequencer registers */
for (i = 1; i < VGA_SEQ_MAX_REG; i++)
{
IOWriteB(VGA_SEQ_INDEX, i);
- IOWriteB(VGA_SEQ_DATA, Registers->Sequencer[i]);
+ IOWriteB(VGA_SEQ_DATA , Registers->Sequencer[i]);
}
/* Synchronous reset off */
@@ -2121,9 +2127,9 @@
/* Unlock CRTC registers 0-7 */
IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_END_HORZ_BLANKING_REG);
- IOWriteB(VGA_CRTC_DATA, IOReadB(VGA_CRTC_DATA) | 0x80);
+ IOWriteB(VGA_CRTC_DATA , IOReadB(VGA_CRTC_DATA) | 0x80);
IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_VERT_RETRACE_END_REG);
- IOWriteB(VGA_CRTC_DATA, IOReadB(VGA_CRTC_DATA) & ~0x80);
+ IOWriteB(VGA_CRTC_DATA , IOReadB(VGA_CRTC_DATA) & ~0x80);
// Make sure they remain unlocked
Registers->CRT[VGA_CRTC_END_HORZ_BLANKING_REG] |= 0x80;
Registers->CRT[VGA_CRTC_VERT_RETRACE_END_REG] &= ~0x80;
@@ -2132,24 +2138,21 @@
for (i = 0; i < VGA_CRTC_MAX_REG; i++)
{
IOWriteB(VGA_CRTC_INDEX, i);
- IOWriteB(VGA_CRTC_DATA, Registers->CRT[i]);
+ IOWriteB(VGA_CRTC_DATA , Registers->CRT[i]);
}
/* Write the GC registers */
for (i = 0; i < VGA_GC_MAX_REG; i++)
{
IOWriteB(VGA_GC_INDEX, i);
- IOWriteB(VGA_GC_DATA, Registers->Graphics[i]);
+ IOWriteB(VGA_GC_DATA , Registers->Graphics[i]);
}
/* Write the AC registers */
- // DbgPrint("\n");
for (i = 0; i < VGA_AC_MAX_REG; i++)
{
VgaSetSinglePaletteRegister(i, Registers->Attribute[i]);
- // DbgPrint("Registers->Attribute[%d] = %d\n", i,
Registers->Attribute[i]);
}
- // DbgPrint("\n");
/* Set the PEL mask */
IOWriteB(VGA_DAC_MASK, 0xFF);
@@ -2157,6 +2160,10 @@
/* Enable screen and disable palette access */
IOReadB(VGA_INSTAT1_READ); // Put the AC register into index state
IOWriteB(VGA_AC_INDEX, 0x20);
+
+ /* Turn the video on */
+ IOWriteB(VGA_SEQ_INDEX, VGA_SEQ_CLOCK_REG);
+ IOWriteB(VGA_SEQ_DATA , IOReadB(VGA_SEQ_DATA) & ~VGA_SEQ_CLOCK_SD);
/* Enable interrupts */
setIF(1);
@@ -2263,6 +2270,53 @@
}
}
+static VOID VidBiosSetCursorShape(WORD CursorStartEnd)
+{
+ /* Only valid in text-mode */
+ if ((Bda->VideoMode > 0x03) && (Bda->VideoMode != 0x07)) return;
+
+ /* Update the BDA */
+ Bda->CursorStartLine = HIBYTE(CursorStartEnd) & 0x1F;
+ Bda->CursorEndLine = LOBYTE(CursorStartEnd) & 0x1F;
+
+ /*
+ * In cursor emulation mode, we suppose the cursor scanlines
+ * to be in CGA mode, so that we need to adjust them
+ *
+ * WARNING!!
+ * =========
+ * Contrary to what is mentioned in lots of literature out there, e.g. in:
+ * http://webpages.charter.net/danrollins/techhelp/0072.HTM
+ * http://www.bioscentral.com/misc/bda.htm
+ * and in other various places, bit 0 of Bda->VGAOptions is 0 when
+ * cursor emulation is ENABLED, and is 1 when it is DISABLED.
+ *
+ * The following documentation is right about this fact:
+ *
http://www.cs.nyu.edu/~mwalfish/classes/ut/s12-cs372h/ref/hardware/vgadoc/V…
+ * https://sites.google.com/site/pcdosretro/biosdata
+ *
+ * A proof that it is OK is that in the following code samples it is
+ * explicitely mentioned that setting bit 0 disables cursor emulation:
+ * - Code snippets in PC Magazine vol.5 num.15 of 16/09/1986, p.291-292;
+ * - CardFile DOS utility (Jeff Prosise, PC Magazine vol.6 num.17 of 13/10/1987,
p.403-416):
+ * https://ia600700.us.archive.org/1/items/srccode-00000020/cardfile.asm.txt
+ * (function 'show_cursor', "or ega_info,1 ;disable EGA cursor
emulation")
+ */
+ if (!(Bda->VGAOptions & 0x01))
+ {
+ // HACK: Quick "fix" for cursor scanline adjustment. This must be
reworked.
+ DPRINT1("HACK: Using HACK for cursor scanlines adjustment\n");
+ CursorStartEnd = MAKEWORD((LOBYTE(CursorStartEnd) & 0x1F) * 2,
+ (HIBYTE(CursorStartEnd) & 0x1F) * 2 |
(HIBYTE(CursorStartEnd) & 0xE0));
+ }
+
+ /* Modify the CRTC registers */
+ IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_START_REG);
+ IOWriteB(VGA_CRTC_DATA , HIBYTE(CursorStartEnd));
+ IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_END_REG);
+ IOWriteB(VGA_CRTC_DATA , LOBYTE(CursorStartEnd));
+}
+
VOID VidBiosSyncCursorPosition(VOID)
{
BYTE Row, Column;
@@ -2340,7 +2394,7 @@
Bda->VideoPageOffset = Bda->VideoPage * Bda->VideoPageSize;
/* 256 KB Video RAM; set bit 7 if we do not clear the screen */
- Bda->VGAOptions = 0x60 | (DoNotClear ? 0x80 : 0x00);
+ Bda->VGAOptions = 0x60 | (Bda->VGAOptions & 0x7F) | (DoNotClear ? 0x80
: 0x00);
Bda->VGASwitches = 0xF9; /* High-resolution */
/* Set the start address in the CRTC */
@@ -2357,6 +2411,15 @@
Resolution = VgaGetDisplayResolution();
Bda->ScreenColumns = Resolution.X;
Bda->ScreenRows = Resolution.Y - 1;
+
+ /*
+ * Update the cursor shape (text-mode only).
+ * Use the default CGA cursor scanline values,
+ * see: http://vitaly_filatov.tripod.com/ng/asm/asm_023.2.html
+ */
+ if ((ModeNumber >= 0x00 && ModeNumber <= 0x03) || (ModeNumber ==
0x07))
+ // FIXME: we might read the CRT registers and do the adjustment?
+ VidBiosSetCursorShape(MAKEWORD(0x07, 0x06));
/* Set the cursor position for each page */
for (Page = 0; Page < BIOS_MAX_PAGES; ++Page)
@@ -2519,18 +2582,7 @@
/* Set Text-Mode Cursor Shape */
case 0x01:
{
- WORD CursorStartEnd = getCX();
-
- /* Update the BDA */
- Bda->CursorStartLine = HIBYTE(CursorStartEnd) & 0x1F;
- Bda->CursorEndLine = LOBYTE(CursorStartEnd) & 0x1F;
-
- /* Modify the CRTC registers */
- IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_START_REG);
- IOWriteB(VGA_CRTC_DATA , HIBYTE(CursorStartEnd));
- IOWriteB(VGA_CRTC_INDEX, VGA_CRTC_CURSOR_END_REG);
- IOWriteB(VGA_CRTC_DATA , Bda->CursorEndLine);
-
+ VidBiosSetCursorShape(getCX());
break;
}
@@ -2548,7 +2600,6 @@
if (getBH() >= BIOS_MAX_PAGES) break;
/* Return the result */
- setAX(0);
setCX(MAKEWORD(Bda->CursorEndLine, Bda->CursorStartLine));
setDX(Bda->CursorPosition[getBH()]);
break;
@@ -2650,7 +2701,7 @@
/* Set Video Colors */
case 0x0B:
{
- if (Bda->VideoMode < 4 || Bda->VideoMode > 6)
+ if (Bda->VideoMode < 0x04 || Bda->VideoMode > 0x06)
{
DPRINT1("BIOS Function INT 10h, AH = 0Bh, BH = 0x%02X is unsupported
for non-CGA modes\n",
getBH());
@@ -2673,7 +2724,7 @@
VgaSetSinglePaletteRegister(VGA_AC_OVERSCAN_REG, Index);
/* Don't set any extra colors when in text mode */
- if (Bda->VideoMode <= 3) break;
+ if (Bda->VideoMode <= 0x03) break;
VgaSetSinglePaletteRegister(0x00, Index);
@@ -2704,7 +2755,7 @@
Bda->CrtColorPaletteMask = (Bda->CrtColorPaletteMask &
0xDF) | ((Index & 1) ? 0x20 : 0x00);
/* Don't set any extra colors when in text mode */
- if (Bda->VideoMode <= 3) break;
+ if (Bda->VideoMode <= 0x03) break;
Index = (Bda->CrtColorPaletteMask & 0x10) | 0x02 | Index;
@@ -3051,8 +3102,71 @@
/* Alternate Function Select */
case 0x12:
{
- DPRINT1("BIOS Function INT 10h, AH = 12h (Alternate Function Select), BX
= 0x%04X NOT IMPLEMENTED\n",
- getBX());
+ switch (getBL())
+ {
+ /* Get EGA/VGA Information */
+ case 0x10:
+ {
+ setBH((Bda->VGAOptions & 0x02) >> 1); /* Color (0) or
monochrome (1) display */
+ setBL((Bda->VGAOptions & 0x60) >> 5); /* Video RAM
size */
+ setCH((Bda->VGASwitches & 0xF0) >> 4); /* Features
settings */
+ setCL( Bda->VGASwitches & 0x0F); /* Switches settings
*/
+ break;
+ }
+
+ /* Enable/Disable Cursor Emulation */
+ case 0x34:
+ {
+ BYTE State = getAL();
+
+ /* Check for validity */
+ if (State > 1) break;
+
+ /*
+ * Enable (State == 0) or disable (State == 1) cursor emulation.
+ * Please read the WARNING in the 'VidBiosSetCursorShape'
+ * function for more details.
+ */
+ Bda->VGAOptions = (Bda->VGAOptions & 0xFE) | (State &
0x01);
+
+ /* Return success */
+ setAL(0x12);
+ break;
+ }
+
+ /* Enable/Disable screen refresh */
+ case 0x36:
+ {
+ BYTE State = getAL();
+ BYTE Clocking;
+
+ /* Check for validity */
+ if (State > 1) break;
+
+ /* Turn the video on (State == 0) or off (State == 1) */
+ IOWriteB(VGA_SEQ_INDEX, VGA_SEQ_CLOCK_REG);
+ Clocking = IOReadB(VGA_SEQ_DATA);
+
+ if (State == 0)
+ Clocking &= ~VGA_SEQ_CLOCK_SD;
+ else
+ Clocking |= VGA_SEQ_CLOCK_SD;
+
+ IOWriteB(VGA_SEQ_DATA, Clocking);
+
+ /* Return success */
+ setAL(0x12);
+ break;
+ }
+
+ default:
+ {
+ DPRINT1("BIOS Function INT 10h, AH = 12h (Alternate Function
Select), BX = 0x%04X NOT IMPLEMENTED\n",
+ getBX());
+ break;
+ }
+ }
+
break;
}