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Enable the SYSENTER/SYSEXIT MSR's on Pentium Pro, fixes OpenBSD booting, fixes #4873.

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This commit is contained in:
OBattler
2024-09-30 18:08:05 +02:00
parent b559b884ef
commit 7e0c6e9b69
1 changed files with 0 additions and 18 deletions
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18
src/cpu/cpu.c
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@@ -3300,26 +3300,17 @@ pentium_invalid_rdmsr:
break;
/* SYSENTER_CS - SYSENTER target CS */
case 0x174:
if (cpu_s->cpu_type == CPU_PENTIUMPRO)
goto i686_invalid_rdmsr;
EAX &= 0xffff0000;
EAX |= msr.sysenter_cs;
EDX = 0x00000000;
break;
/* SYSENTER_ESP - SYSENTER target ESP */
case 0x175:
if (cpu_s->cpu_type == CPU_PENTIUMPRO)
goto i686_invalid_rdmsr;
EAX = msr.sysenter_esp;
EDX = 0x00000000;
break;
/* SYSENTER_EIP - SYSENTER target EIP */
case 0x176:
if (cpu_s->cpu_type == CPU_PENTIUMPRO)
goto i686_invalid_rdmsr;
EAX = msr.sysenter_eip;
EDX = 0x00000000;
break;
@@ -4069,23 +4060,14 @@ pentium_invalid_wrmsr:
break;
/* SYSENTER_CS - SYSENTER target CS */
case 0x174:
if (cpu_s->cpu_type == CPU_PENTIUMPRO)
goto i686_invalid_wrmsr;
msr.sysenter_cs = EAX & 0xFFFF;
break;
/* SYSENTER_ESP - SYSENTER target ESP */
case 0x175:
if (cpu_s->cpu_type == CPU_PENTIUMPRO)
goto i686_invalid_wrmsr;
msr.sysenter_esp = EAX;
break;
/* SYSENTER_EIP - SYSENTER target EIP */
case 0x176:
if (cpu_s->cpu_type == CPU_PENTIUMPRO)
goto i686_invalid_wrmsr;
msr.sysenter_eip = EAX;
break;
/* MCG_CAP - Machine Check Global Capability */