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Ported the (S)VGA linear read latch fix from PCem.

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This commit is contained in:
OBattler
2019-12-28 05:51:22 +01:00
parent 8cad1a3c4c
commit f12d9c14db
1 changed files with 12 additions and 22 deletions
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34
src/video/vid_svga.c
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@@ -11,7 +11,7 @@
* This is intended to be used by another SVGA driver, * This is intended to be used by another SVGA driver,
* and not as a card in it's own right. * and not as a card in it's own right.
* *
* Version: @(#)vid_svga.c 1.0.39 2019/12/03 * Version: @(#)vid_svga.c 1.0.40 2019/12/28
* *
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/> * Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com> * Miran Grca, <mgrca8@gmail.com>
@@ -1119,31 +1119,21 @@ svga_read_common(uint32_t addr, uint8_t linear, void *p)
addr &= svga->decode_mask; addr &= svga->decode_mask;
/* standard VGA latched access */ /* standard VGA latched access */
if (linear) { if (latch_addr >= svga->vram_max) {
if (addr >= svga->vram_max) for (i = 0; i < count; i++)
return 0xff; svga->latch.b[i] = 0xff;
} else {
addr &= svga->vram_mask; latch_addr &= svga->vram_mask;
for (i = 0; i < count; i++) for (i = 0; i < count; i++)
svga->latch.b[i] = svga->vram[addr | i]; svga->latch.b[i] = svga->vram[latch_addr | i];
} else {
if (latch_addr >= svga->vram_max) {
for (i = 0; i < count; i++)
svga->latch.b[i] = 0xff;
} else {
latch_addr &= svga->vram_mask;
for (i = 0; i < count; i++)
svga->latch.b[i] = svga->vram[latch_addr | i];
}
if (addr >= svga->vram_max)
return 0xff;
addr &= svga->vram_mask;
} }
if (addr >= svga->vram_max)
return 0xff;
addr &= svga->vram_mask;
if (svga->readmode) { if (svga->readmode) {
temp = 0xff; temp = 0xff;