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Kernel: Move feature string building to ProcessorInfo

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Other than a dmesgln(), ProcessorInfo is the only user of this function
and is already responsible for building other CPUID-related strings.
This commit is contained in:
Linus Groh 2022-04-03 16:47:38 +01:00 committed by Andreas Kling
parent 53a95a5347
commit afce63fffc
Notes: sideshowbarker 2024-07-17 14:30:47 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/afce63fffc
Pull-request: https://github.com/SerenityOS/serenity/pull/13482
Reviewed-by: https://github.com/bgianfo ✅
4 changed files with 21 additions and 22 deletions
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2
Kernel/Arch/x86/Processor.h
View file

@ -128,8 +128,6 @@ class Processor {
void cpu_detect();
void cpu_setup();
NonnullOwnPtr<KString> features_string() const;
public:
Processor() = default;

1
Kernel/Arch/x86/ProcessorInfo.h
View file

@ -22,6 +22,7 @@ public:
static NonnullOwnPtr<KString> build_vendor_id_string();
static NonnullOwnPtr<KString> build_brand_string();
static NonnullOwnPtr<KString> build_features_string(Processor const&);
StringView vendor_id_string() const { return m_vendor_id_string->view(); }
StringView brand_string() const { return m_brand_string->view(); }

22
Kernel/Arch/x86/common/Processor.cpp
View file

@ -596,22 +596,6 @@ UNMAP_AFTER_INIT void Processor::cpu_setup()
#endif
}
NonnullOwnPtr<KString> Processor::features_string() const
{
StringBuilder builder;
bool first = true;
for (auto feature = CPUFeature::Type(1u); feature != CPUFeature::__End; feature <<= 1u) {
if (has_feature(feature)) {
if (first)
first = false;
else
MUST(builder.try_append(' '));
MUST(builder.try_append(cpu_feature_to_string_view(feature)));
}
}
return KString::must_create(builder.string_view());
}
UNMAP_AFTER_INIT void Processor::early_initialize(u32 cpu)
{
m_self = this;
@ -651,7 +635,9 @@ UNMAP_AFTER_INIT void Processor::initialize(u32 cpu)
VERIFY(m_self == this);
VERIFY(&current() == this); // sanity check
dmesgln("CPU[{}]: Supported features: {}", current_id(), features_string());
m_info = new ProcessorInfo(*this);
dmesgln("CPU[{}]: Supported features: {}", current_id(), m_info->features_string());
if (!has_feature(CPUFeature::RDRAND))
dmesgln("CPU[{}]: No RDRAND support detected, randomness will be poor", current_id());
dmesgln("CPU[{}]: Physical address bit width: {}", current_id(), m_physical_address_bit_width);
@ -680,8 +666,6 @@ UNMAP_AFTER_INIT void Processor::initialize(u32 cpu)
detect_hypervisor();
}
m_info = new ProcessorInfo(*this);
{
// We need to prevent races between APs starting up at the same time
VERIFY(cpu < s_processors.size());

18
Kernel/Arch/x86/common/ProcessorInfo.cpp
View file

@ -15,7 +15,7 @@ namespace Kernel {
ProcessorInfo::ProcessorInfo(Processor const& processor)
: m_vendor_id_string(build_vendor_id_string())
, m_brand_string(build_brand_string())
, m_features_string(processor.features_string())
, m_features_string(build_features_string(processor))
{
CPUID cpuid(1);
m_stepping = cpuid.eax() & 0xf;
@ -75,4 +75,20 @@ NonnullOwnPtr<KString> ProcessorInfo::build_brand_string()
return KString::must_create(buffer);
}
NonnullOwnPtr<KString> ProcessorInfo::build_features_string(Processor const& processor)
{
StringBuilder builder;
bool first = true;
for (auto feature = CPUFeature::Type(1u); feature != CPUFeature::__End; feature <<= 1u) {
if (processor.has_feature(feature)) {
if (first)
first = false;
else
MUST(builder.try_append(' '));
MUST(builder.try_append(cpu_feature_to_string_view(feature)));
}
}
return KString::must_create(builder.string_view());
}
}