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better vga irq2 emulation/misc vga reg vret signalling (hal)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3168
This commit is contained in:
Sebastian Strohhäcker 2008-06-03 18:35:32 +00:00
parent c1722ea760
commit b5c65f12a0
3 changed files with 43 additions and 19 deletions
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7
src/hardware/vga_crtc.cpp
View file

@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: vga_crtc.cpp,v 1.32 2008-03-30 18:02:23 qbix79 Exp $ */
/* $Id: vga_crtc.cpp,v 1.33 2008-06-03 18:35:32 c2woody Exp $ */
#include <stdlib.h>
#include "dosbox.h"
@ -220,6 +220,11 @@ void vga_write_p3d5(Bitu port,Bitu val,Bitu iolen) {
break;
case 0x11: /* Vertical Retrace End Register */
crtc(vertical_retrace_end)=val;
if (IS_EGAVGA_ARCH && !(val & 0x10)) {
vga.draw.vret_triggered=false;
if (GCC_UNLIKELY(machine==MCH_EGA)) PIC_DeActivateIRQ(9);
}
if (IS_VGA_ARCH) crtc(read_only)=(val & 128)>0;
else crtc(read_only)=false;
/*

21
src/hardware/vga_draw.cpp
View file

@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: vga_draw.cpp,v 1.100 2008-05-28 20:43:13 qbix79 Exp $ */
/* $Id: vga_draw.cpp,v 1.101 2008-06-03 18:35:32 c2woody Exp $ */
#include <string.h>
#include <math.h>
@ -730,6 +730,13 @@ static void INLINE VGA_ChangesStart( void ) {
}
#endif
static void VGA_VertInterrupt(Bitu val) {
if ((!vga.draw.vret_triggered) && ((vga.crtc.vertical_retrace_end&0x30)==0x10)) {
vga.draw.vret_triggered=true;
if (GCC_UNLIKELY(machine==MCH_EGA)) PIC_ActivateIRQ(9);
}
}
static void VGA_DisplayStartLatch(Bitu val) {
vga.config.real_start=vga.config.display_start & (vga.vmemwrap-1);
}
@ -750,6 +757,11 @@ static void VGA_VerticalTimer(Bitu val) {
} else PIC_AddEvent( VGA_DisplayStartLatch,(float)flip_offset);
PIC_AddEvent(VGA_PanningLatch,(float)vga.draw.delay.vrend);
// EGA: 82c435 datasheet: interrupt happens at display end
// VGA: checked with scope
// add a little amount of time to make sure the last drawpart has already fired
if (IS_EGAVGA_ARCH) PIC_AddEvent(VGA_VertInterrupt,(float)(vga.draw.delay.vdend + 0.005));
if ( GCC_UNLIKELY( vga.draw.parts_left)) {
if (!IS_VGA_ARCH || (svgaCard!=SVGA_None)) {
LOG(LOG_VGAMISC,LOG_NORMAL)( "Parts left: %d", vga.draw.parts_left );
@ -841,12 +853,7 @@ static void VGA_VerticalTimer(Bitu val) {
#ifdef VGA_KEEP_CHANGES
if (startaddr_changed) VGA_ChangesStart();
#endif
if (GCC_UNLIKELY(machine==MCH_EGA)) {
if (!(vga.crtc.vertical_retrace_end&0x20)) {
PIC_ActivateIRQ(2);
vga.draw.vret_triggered=true;
}
}
if ((IS_VGA_ARCH) && (svgaCard==SVGA_None)) PIC_AddEvent(VGA_DrawSingleLine,(float)(vga.draw.delay.htotal/4.0));
else PIC_AddEvent(VGA_DrawPart,(float)vga.draw.delay.parts,vga.draw.parts_lines);
//VGA_DrawPart( vga.draw.parts_lines );

34
src/hardware/vga_misc.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (C) 2002-2007 The DOSBox Team
* Copyright (C) 2002-2008 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: vga_misc.cpp,v 1.36 2007-12-10 22:11:13 c2woody Exp $ */
/* $Id: vga_misc.cpp,v 1.37 2008-06-03 18:35:32 c2woody Exp $ */
#include "dosbox.h"
#include "inout.h"
@ -135,16 +135,28 @@ static Bitu read_p3c8(Bitu port,Bitu iolen) {
}
static Bitu read_p3c2(Bitu port,Bitu iolen) {
if (GCC_UNLIKELY(machine==MCH_EGA)) {
Bitu retcode=0x60;
retcode |= (vga.draw.vret_triggered ? 0x80 : 0x00);
vga.draw.vret_triggered=false;
// ega colour monitor
if ((((vga.misc_output>>2)&3)==0) || (((vga.misc_output>>2)&3)==3)) retcode|=0x10;
return retcode;
} else {
return 0x70;
Bit8u retval=0;
if (machine==MCH_EGA) retval = 0x0F;
else if (IS_VGA_ARCH) retval = 0x60;
if ((machine==MCH_VGA) || (((vga.misc_output>>2)&3)==0) || (((vga.misc_output>>2)&3)==3)) {
retval |= 0x10;
}
if (vga.draw.vret_triggered) retval |= 0x80;
return retval;
/*
0-3 0xF on EGA, 0x0 on VGA
4 Status of the switch selected by the Miscellaneous Output
Register 3C2h bit 2-3. Switch high if set.
(apparently always 1 on VGA)
5 (EGA) Pin 19 of the Feature Connector (FEAT0) is high if set
6 (EGA) Pin 17 of the Feature Connector (FEAT1) is high if set
(default differs by card, ET4000 sets them both)
7 If set IRQ 2 has happened due to Vertical Retrace.
Should be cleared by IRQ 2 interrupt routine by clearing port 3d4h
index 11h bit 4.
*/
}
void VGA_SetupMisc(void) {