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Kernel: Detect syscall/sysenter support

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Tom 2020-07-07 19:23:38 -06:00 • committed by Andreas Kling
parent 5b6920a18a
commit ce5ae83963
2 changed files with 25 additions and 2 deletions
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16
Kernel/Arch/i386/CPU.cpp
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@ -788,10 +788,20 @@ void Processor::cpu_detect()
set_feature(CPUFeature::TSC);
if (processor_info.ecx() & (1 << 30))
set_feature(CPUFeature::RDRAND);
if (processor_info.edx() & (1 << 11)) {
u32 stepping = processor_info.eax() & 0xf;
u32 model = (processor_info.eax() >> 4) & 0xf;
u32 family = (processor_info.eax() >> 8) & 0xf;
if (!(family == 6 && model < 3 && stepping < 3))
set_feature(CPUFeature::SEP);
}
CPUID extended_processor_info(0x80000001);
if (extended_processor_info.edx() & (1 << 20))
set_feature(CPUFeature::NX);
if (extended_processor_info.edx() & (1 << 11)) {
// Only available in 64 bit mode
set_feature(CPUFeature::SYSCALL);
}
CPUID extended_features(0x7);
if (extended_features.ebx() & (1 << 20))
@ -895,6 +905,10 @@ String Processor::features_string() const
return "tsc";
case CPUFeature::UMIP:
return "umip";
case CPUFeature::SEP:
return "sep";
case CPUFeature::SYSCALL:
return "syscall";
// no default statement here intentionally so that we get
// a warning if a new feature is forgotten to be added here
}