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Added Page Size Extension (4MB pages) to Pentium CPUs.

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This commit is contained in:
SarahW 2017-07-16 21:24:09 +01:00
commit dc511447df
3 changed files with 41 additions and 4 deletions
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35
src/mem.c
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@ -873,6 +873,32 @@ uint32_t mmutranslatereal(uint32_t addr, int rw)
}*/
return -1;
}
if ((temp & 0x80) && (cr4 & CR4_PSE))
{
/*4MB page*/
if ((CPL == 3 && !(temp & 4) && !cpl_override) || (rw && !(temp & 2) && (CPL == 3 || cr0 & WP_FLAG)))
{
// if (!nopageerrors) pclog("Page not present! %08X %08X %02X %02X %i %08X %04X:%08X %04X:%08X %i %i %i\n",addr,temp,opcode,opcode2,frame,rmdat32, CS,pc,SS,ESP,ins,CPL,rw);
cr2 = addr;
temp &= 1;
if (CPL == 3)
temp |= 4;
if (rw)
temp |= 2;
cpu_state.abrt = ABRT_PF;
abrt_error = temp;
return -1;
}
mmu_perm = temp & 4;
((uint32_t *)ram)[addr2>>2] |= 0x20;
return (temp & ~0x3fffff) + (addr & 0x3fffff);
}
temp=((uint32_t *)ram)[((temp&~0xFFF)+((addr>>10)&0xFFC))>>2];
temp3=temp&temp2;
// if (output == 3) pclog("Do translate %08X %08X\n", temp, temp3);
@ -921,6 +947,15 @@ uint32_t mmutranslate_noabrt(uint32_t addr, int rw)
if (!(temp&1))
return -1;
if ((temp & 0x80) && (cr4 & CR4_PSE))
{
/*4MB page*/
if ((CPL == 3 && !(temp & 4) && !cpl_override) || (rw && !(temp & 2) && (CPL == 3 || cr0 & WP_FLAG)))
return -1;
return (temp & ~0x3fffff) + (addr & 0x3fffff);
}
temp=((uint32_t *)ram)[((temp&~0xFFF)+((addr>>10)&0xFFC))>>2];
temp3=temp&temp2;