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Add dummy MSRs on RDMSR to appease whatever CPU-Z is looking for on Pentium II systems

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This commit is contained in:
Jonathan Campbell 2022-01-02 22:23:49 -08:00
parent 81ccc54180
commit 64c27b55e4
1 changed files with 15 additions and 0 deletions
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15
src/cpu/cpu.cpp
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@ -4260,6 +4260,11 @@ bool CPU_RDMSR() {
reg_edx = reg_eax = 0;
UNBLOCKED_LOG(LOG_CPU,LOG_NORMAL)("RDMSR: Faking Local APIC");
return true;
case 0x0000002a: /* MSR_IA32_EBL_CR_POWERON */
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUMII) return false;
reg_edx = reg_eax = 0;
UNBLOCKED_LOG(LOG_CPU,LOG_NORMAL)("RDMSR: MSR_IA32_EBL_CR_POWERON");
return true;
case 0x0000008b: /* Intel microcode revision... Windows ME insists on reading this at startup if Pentium II and stepping 3 */
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUMII) return false;
UNBLOCKED_LOG(LOG_CPU,LOG_NORMAL)("RDMSR: Guest is reading Intel microcode revision");
@ -4281,6 +4286,16 @@ bool CPU_RDMSR() {
UNBLOCKED_LOG(LOG_CPU,LOG_NORMAL)("RDMSR: Attempt to read MSR_PLATFORM_INFO");
reg_edx = reg_eax = 0;
return true;
case 0x00000119: /* MSR_IA32_BBL_CR_CTL */
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUMII) return false;
reg_edx = reg_eax = 0;
UNBLOCKED_LOG(LOG_CPU,LOG_NORMAL)("RDMSR: MSR_IA32_BBL_CR_CTL");
return true;
case 0x0000011e: /* MSR_IA32_BBL_CR_CTL3 */
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUMII) return false;
reg_edx = reg_eax = 0;
UNBLOCKED_LOG(LOG_CPU,LOG_NORMAL)("RDMSR: MSR_IA32_BBL_CR_CTL3");
return true;
case 0x00000140: /* IA32_MISC_ENABLE [https://www.geoffchappell.com/studies/windows/km/cpu/msr/misc_enable.htm] */
/* Linux kernel assumes this MSR is present if Pentium III and will crash otherwise */
if (CPU_ArchitectureType<CPU_ARCHTYPE_PENTIUMIII) return false;