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Pentium II: Change BIOS update signature to non-zero on CPUID with EAX = 1, fixes microcode update error messages on some BIOS'es.

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OBattler 2024-12-22 04:09:55 +01:00
parent 74bda71219
commit 8f25851406
1 changed files with 16 additions and 0 deletions
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16
src/cpu/cpu.c
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@ -2432,6 +2432,11 @@ cpu_CPUID(void)
EAX = CPUID;
EBX = ECX = 0;
EDX = CPUID_FPU | CPUID_DE | CPUID_TSC | CPUID_MSR | CPUID_CMPXCHG8B | CPUID_CMOV | CPUID_MMX;
/*
Return anything non-zero in bits 32-63 of the BIOS signature MSR
to indicate there has been an update.
*/
msr.bbl_cr_dx[3] = 0xffffffff00000000ULL;
} else
EAX = EBX = ECX = EDX = 0;
break;
@ -2470,6 +2475,11 @@ cpu_CPUID(void)
EAX = CPUID;
EBX = ECX = 0;
EDX = CPUID_FPU | CPUID_VME | CPUID_DE | CPUID_PSE | CPUID_TSC | CPUID_MSR | CPUID_PAE | CPUID_MCE | CPUID_CMPXCHG8B | CPUID_MMX | CPUID_MTRR | CPUID_PGE | CPUID_MCA | CPUID_SEP | CPUID_CMOV;
/*
Return anything non-zero in bits 32-63 of the BIOS signature MSR
to indicate there has been an update.
*/
msr.bbl_cr_dx[3] = 0xffffffff00000000ULL;
} else if (EAX == 2) {
EAX = 0x03020101; /* Instruction TLB: 4 KB pages, 4-way set associative, 32 entries
Instruction TLB: 4 MB pages, fully associative, 2 entries
@ -2493,6 +2503,11 @@ cpu_CPUID(void)
EAX = CPUID;
EBX = ECX = 0;
EDX = CPUID_FPU | CPUID_VME | CPUID_DE | CPUID_PSE | CPUID_TSC | CPUID_MSR | CPUID_PAE | CPUID_MCE | CPUID_CMPXCHG8B | CPUID_MMX | CPUID_MTRR | CPUID_PGE | CPUID_MCA | CPUID_SEP | CPUID_FXSR | CPUID_CMOV | CPUID_PSE36;
/*
Return anything non-zero in bits 32-63 of the BIOS signature MSR
to indicate there has been an update.
*/
msr.bbl_cr_dx[3] = 0xffffffff00000000ULL;
} else if (EAX == 2) {
EAX = 0x03020101; /* Instruction TLB: 4 KB pages, 4-way set associative, 32 entries
Instruction TLB: 4 MB pages, fully associative, 2 entries
@ -3250,6 +3265,7 @@ pentium_invalid_rdmsr:
case 0x88 ... 0x8b:
EAX = msr.bbl_cr_dx[ECX - 0x88] & 0xffffffff;
EDX = msr.bbl_cr_dx[ECX - 0x88] >> 32;
// EDX |= 0xffffffff;
break;
/* Unknown */
case 0xae: