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OPTi chipset mask and CPU fixes, fixes #895.

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OBattler
2024-07-25 06:54:26 +02:00
parent 0af09b0578
commit 3ea7f2ad92
6 changed files with 139 additions and 59 deletions
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21
src/cpu/x86_ops_pmode.h
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@@ -430,12 +430,21 @@ op0F01_common(uint32_t fetchdat, int is32, int is286, int ea32)
case 0x20: /*SMSW*/
if (cpu_mod != 3)
SEG_CHECK_WRITE(cpu_state.ea_seg);
if (is486 || isibm486)
seteaw(msw);
else if (is386)
seteaw(msw | /* 0xFF00 */ 0xFFE0);
else
seteaw(msw | 0xFFF0);
if (is386 && is32 && (cpu_mod == 3)) {
if (is486 || isibm486)
seteaw(cr0);
else if (is386 && !cpu_16bitbus)
seteaw(cr0 | /* 0x7FFFFF00 */ 0x7FFFFFE0);
else
seteaw(cr0 | 0x7FFFFFF0);
} else {
if (is486 || isibm486)
seteaw(msw);
else if (is386 && !cpu_16bitbus)
seteaw(msw | /* 0xFF00 */ 0xFFE0);
else
seteaw(msw | 0xFFF0);
}
CLOCK_CYCLES(2);
PREFETCH_RUN(2, 2, rmdat, 0, 0, (cpu_mod == 3) ? 0 : 1, 0, ea32);
break;