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Kernel: Move hypervisor vendor ID string to ProcessorInfo

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This will make it possible to expose it in /proc/cpuinfo. :^)
This commit is contained in:
Linus Groh 2022-04-03 16:58:36 +01:00 • committed by Andreas Kling
parent f6181cd47e
commit 8d96525b9d
3 changed files with 31 additions and 21 deletions
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35
Kernel/Arch/x86/common/ProcessorInfo.cpp
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@ -14,6 +14,7 @@ namespace Kernel {
ProcessorInfo::ProcessorInfo(Processor const& processor)
: m_vendor_id_string(build_vendor_id_string())
, m_hypervisor_vendor_id_string(build_hypervisor_vendor_id_string(processor))
, m_brand_string(build_brand_string())
, m_features_string(build_features_string(processor))
{
@ -35,21 +36,35 @@ ProcessorInfo::ProcessorInfo(Processor const& processor)
m_display_model = model;
}
}
static void emit_u32(StringBuilder& builder, u32 value)
{
builder.appendff("{:c}{:c}{:c}{:c}",
value & 0xff,
(value >> 8) & 0xff,
(value >> 16) & 0xff,
(value >> 24) & 0xff);
};
NonnullOwnPtr<KString> ProcessorInfo::build_vendor_id_string()
{
CPUID cpuid(0);
StringBuilder builder;
auto emit_u32 = [&](u32 value) {
builder.appendff("{:c}{:c}{:c}{:c}",
value & 0xff,
(value >> 8) & 0xff,
(value >> 16) & 0xff,
(value >> 24) & 0xff);
};
emit_u32(cpuid.ebx());
emit_u32(cpuid.edx());
emit_u32(cpuid.ecx());
emit_u32(builder, cpuid.ebx());
emit_u32(builder, cpuid.edx());
emit_u32(builder, cpuid.ecx());
return KString::must_create(builder.string_view());
}
NonnullOwnPtr<KString> ProcessorInfo::build_hypervisor_vendor_id_string(Processor const& processor)
{
if (!processor.has_feature(CPUFeature::HYPERVISOR))
return KString::must_create({});
CPUID cpuid(0x40000000);
StringBuilder builder;
emit_u32(builder, cpuid.ebx());
emit_u32(builder, cpuid.ecx());
emit_u32(builder, cpuid.edx());
return KString::must_create(builder.string_view());
}