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386_common: Optimize I/O permission checking for word and dword operations (based on qemu)

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RichardG867
2023-04-22 18:41:42 -03:00
parent 041e916472
commit c076406450
7 changed files with 50 additions and 97 deletions
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19
src/cpu/386_common.c
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@@ -1427,25 +1427,26 @@ x86illegal(void)
}
int
checkio(uint32_t port)
checkio(uint32_t port, int mask)
{
uint16_t t;
uint8_t d;
cpl_override = 1;
t = readmemw(tr.base, 0x66);
cpl_override = 0;
if (cpu_state.abrt)
if (cpu_state.abrt) {
cpl_override = 0;
return 0;
}
if ((t + (port >> 3UL)) > tr.limit)
return 1;
if ((t + (port >> 3UL) + 1) > tr.limit) {
cpl_override = 0;
return mask;
}
cpl_override = 1;
d = readmembl(tr.base + t + (port >> 3));
t = readmemwl(tr.base + t + (port >> 3));
cpl_override = 0;
return d & (1 << (port & 7));
return (t >> (port & 7)) & mask;
}
#ifdef OLD_DIVEXCP