@@ -152,6 +152,10 @@ enum vga_retrace_method {
extern enum vga_retrace_method vga_retrace_method;
+#define VGA_CGA_HACK_PALETTE_BLANKING (1<<0)
+#define VGA_CGA_HACK_FONT_HEIGHT (1<<1)
+extern int vga_cga_hacks;
+
int isa_vga_mm_init(hwaddr vram_base,
hwaddr ctrl_base, int it_shift,
MemoryRegion *address_space);
@@ -552,14 +552,31 @@ void vga_ioport_write(void *opaque, uint32_t addr, uint32_t val)
printf("vga: write CR%x = 0x%02x\n", s->cr_index, val);
#endif
/* handle CR0-7 protection */
- if ((s->cr[VGA_CRTC_V_SYNC_END] & VGA_CR11_LOCK_CR0_CR7) &&
- s->cr_index <= VGA_CRTC_OVERFLOW) {
- /* can always write bit 4 of CR7 */
- if (s->cr_index == VGA_CRTC_OVERFLOW) {
- s->cr[VGA_CRTC_OVERFLOW] = (s->cr[VGA_CRTC_OVERFLOW] & ~0x10) |
- (val & 0x10);
+ if (s->cr[VGA_CRTC_V_SYNC_END] & VGA_CR11_LOCK_CR0_CR7) {
+ if (s->cr_index <= VGA_CRTC_OVERFLOW) {
+ /* can always write bit 4 of CR7 */
+ if (s->cr_index == VGA_CRTC_OVERFLOW) {
+ s->cr[VGA_CRTC_OVERFLOW] =
+ (s->cr[VGA_CRTC_OVERFLOW] & ~0x10) | (val & 0x10);
+ }
+ return;
+ } else if ((vga_cga_hacks & VGA_CGA_HACK_FONT_HEIGHT) &&
+ !(s->sr[VGA_SEQ_CLOCK_MODE] & VGA_SR01_CHAR_CLK_8DOTS)) {
+ /* extra CGA compatibility hacks (not in standard VGA) */
+ if (s->cr_index == VGA_CRTC_MAX_SCAN &&
+ val == 7 &&
+ (s->cr[VGA_CRTC_MAX_SCAN] & 0xf) == 0xf) {
+ return;
+ } else if (s->cr_index == VGA_CRTC_CURSOR_START &&
+ val == 6 &&
+ (s->cr[VGA_CRTC_MAX_SCAN] & 0xf) == 0xf) {
+ val = 0xd;
+ } else if (s->cr_index == VGA_CRTC_CURSOR_END &&
+ val == 7 &&
+ (s->cr[VGA_CRTC_MAX_SCAN] & 0xf) == 0xf) {
+ val = 0xe;
+ }
}
- return;
}
s->cr[s->cr_index] = val;
@@ -1896,7 +1913,11 @@ static void vga_update_display(void *opaque)
/* nothing to do */
} else {
full_update = 0;
- if (!(s->ar_index & 0x20)) {
+ if (!(s->ar_index & 0x20) &&
+ /* extra CGA compatibility hacks (not in standard VGA) */
+ (!(vga_cga_hacks & VGA_CGA_HACK_PALETTE_BLANKING) ||
+ s->ar_index != 0 ||
+ !s->ar_flip_flop)) {
graphic_mode = GMODE_BLANK;
} else {
graphic_mode = s->gr[VGA_GFX_MISC] & VGA_GR06_GRAPHICS_MODE;
@@ -1037,6 +1037,25 @@ Valid optional properties are
@item retrace=dumb|precise
Select dumb (default) or precise VGA retrace logic, useful for some
DOS games/demos.
+@item cga_hacks=@var{hack1}[+@var{hack2}[+...]]
+Enable various extra CGA compatibility hacks for programs that are
+trying to directly set CGA modes without BIOS assistance nor
+real knowledge of EGA/VGA. These might only work with -vga std.
+Valid hacks are
+@table @option
+@item palette_blanking
+Wait to blank the screen until palette registers seem to actually be
+modified, instead of blanking it as soon as the palette address bit (0x10)
+of the attribute address register (0x3c0) is cleared.
+@item font_height
+Ignore attempts to change the VGA font height (index 9),
+cursor start (index 10), and cursor end (index 11) of the CRTC control
+registers (0x3d5) if trying to set them to the default for CGA fonts
+instead of VGA fonts.
+@item all
+Enable all CGA hacks. More CGA hacks may be added in future versions
+of qemu.
+@end table
@end table
ETEXI
@@ -180,6 +180,7 @@ int main(int argc, char **argv)
static const char *data_dir;
const char *bios_name = NULL;
enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
+int vga_cga_hacks = 0;
DisplayType display_type = DT_DEFAULT;
static int display_remote;
const char* keyboard_layout = NULL;
@@ -1881,6 +1882,28 @@ static void select_vgahw (const char *p)
else if (strstart(opts, "precise", &nextopt))
vga_retrace_method = VGA_RETRACE_PRECISE;
else goto invalid_vga;
+ } else if (strstart(opts, ",cga_hacks=", &nextopt)) {
+ opts = nextopt;
+ while (*opts) {
+ if (strstart(opts, "all", &nextopt)) {
+ opts = nextopt;
+ vga_cga_hacks |= ~0;
+ } else if (strstart(opts, "palette_blanking", &nextopt)) {
+ opts = nextopt;
+ vga_cga_hacks |= VGA_CGA_HACK_PALETTE_BLANKING;
+ } else if (strstart(opts, "font_height", &nextopt)) {
+ opts = nextopt;
+ vga_cga_hacks |= VGA_CGA_HACK_FONT_HEIGHT;
+ } else {
+ break;
+ }
+
+ if (*opts == '+') {
+ opts++;
+ } else {
+ break;
+ }
+ }
} else goto invalid_vga;
opts = nextopt;
}
This patch adds some optional compatibility hacks (default disabled) to allow Microport UNIX to function under qemu. I've tried to structure it to be easy to add more hacks for other old CGA programs, if anyone ever needs them. Microport UNIX System V/386 v 2.1 (ca 1987) tries to program the CGA registers directly with neither the assistance of BIOS, nor with proper handling of EGA/VGA-only registers. Note that it didn't work on real VGA hardware, either (although in that case, the most obvious problems seemed to be out-of-range hsync and/or vsync signalling, rather than the issues in this patch). Eventually real MDA and/or CGA support might provide an alternative to this patch, although a hybrid approach like this patch might still be useful in marginal cases. Signed-off-by: Matthew Ogilvie <mmogilvi_qemu@miniinfo.net> --- hw/pc.h | 4 ++++ hw/vga.c | 37 +++++++++++++++++++++++++++++-------- qemu-options.hx | 19 +++++++++++++++++++ vl.c | 23 +++++++++++++++++++++++ 4 files changed, 75 insertions(+), 8 deletions(-)