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Kernel: Add CPUID flag for long mode

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This isn't particularly useful because by the time we've entered
init() the CPU had better support x86_64 anyway. However this shows the
CPU flag in System Monitor - even in 32-bit mode.
This commit is contained in:
Gunnar Beutner 2021-06-26 04:21:51 +02:00 • committed by Andreas Kling
parent 409b874514
commit 389bf82889
2 changed files with 5 additions and 0 deletions
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1
Kernel/Arch/x86/CPUID.h
View file

@ -53,6 +53,7 @@ enum class CPUFeature : u32 {
XSAVE = (1 << 21),
AVX = (1 << 22),
FXSR = (1 << 23),
LM = (1 << 24),
};
}

4
Kernel/Arch/x86/common/Processor.cpp
View file

@ -109,6 +109,8 @@ UNMAP_AFTER_INIT void Processor::cpu_detect()
set_feature(CPUFeature::NX);
if (extended_processor_info.edx() & (1 << 27))
set_feature(CPUFeature::RDTSCP);
if (extended_processor_info.edx() & (1 << 29))
set_feature(CPUFeature::LM);
if (extended_processor_info.edx() & (1 << 11)) {
// Only available in 64 bit mode
set_feature(CPUFeature::SYSCALL);
@ -260,6 +262,8 @@ String Processor::features_string() const
return "xsave";
case CPUFeature::AVX:
return "avx";
case CPUFeature::LM:
return "lm";
// no default statement here intentionally so that we get
// a warning if a new feature is forgotten to be added here
}