mirror of
https://github.com/RGBCube/serenity
synced 2025-05-19 16:55:07 +00:00
112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringBuilder.h>
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#include <AK/Types.h>
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#include <Kernel/Arch/Processor.h>
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#include <Kernel/Arch/x86/CPUID.h>
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#include <Kernel/Arch/x86/ProcessorInfo.h>
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namespace Kernel {
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ProcessorInfo::ProcessorInfo(Processor const& processor)
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: m_vendor_id_string(build_vendor_id_string())
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, m_hypervisor_vendor_id_string(build_hypervisor_vendor_id_string(processor))
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, m_brand_string(build_brand_string())
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, m_features_string(build_features_string(processor))
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{
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CPUID cpuid(1);
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m_stepping = cpuid.eax() & 0xf;
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u32 model = (cpuid.eax() >> 4) & 0xf;
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u32 family = (cpuid.eax() >> 8) & 0xf;
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m_type = (cpuid.eax() >> 12) & 0x3;
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u32 extended_model = (cpuid.eax() >> 16) & 0xf;
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u32 extended_family = (cpuid.eax() >> 20) & 0xff;
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if (family == 15) {
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m_display_family = family + extended_family;
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m_display_model = model + (extended_model << 4);
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} else if (family == 6) {
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m_display_family = family;
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m_display_model = model + (extended_model << 4);
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} else {
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m_display_family = family;
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m_display_model = model;
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}
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}
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static void emit_u32(StringBuilder& builder, u32 value)
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{
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builder.appendff("{:c}{:c}{:c}{:c}",
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value & 0xff,
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(value >> 8) & 0xff,
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(value >> 16) & 0xff,
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(value >> 24) & 0xff);
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};
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NonnullOwnPtr<KString> ProcessorInfo::build_vendor_id_string()
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{
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CPUID cpuid(0);
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StringBuilder builder;
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emit_u32(builder, cpuid.ebx());
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emit_u32(builder, cpuid.edx());
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emit_u32(builder, cpuid.ecx());
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return KString::must_create(builder.string_view());
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}
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NonnullOwnPtr<KString> ProcessorInfo::build_hypervisor_vendor_id_string(Processor const& processor)
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{
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if (!processor.has_feature(CPUFeature::HYPERVISOR))
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return KString::must_create({});
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CPUID cpuid(0x40000000);
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StringBuilder builder;
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emit_u32(builder, cpuid.ebx());
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emit_u32(builder, cpuid.ecx());
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emit_u32(builder, cpuid.edx());
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return KString::must_create(builder.string_view());
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}
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NonnullOwnPtr<KString> ProcessorInfo::build_brand_string()
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{
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u32 max_extended_leaf = CPUID(0x80000000).eax();
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if (max_extended_leaf < 0x80000004)
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return KString::must_create({});
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StringBuilder builder;
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auto append_brand_string_part_to_builder = [&](u32 i) {
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CPUID cpuid(0x80000002 + i);
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emit_u32(builder, cpuid.eax());
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emit_u32(builder, cpuid.ebx());
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emit_u32(builder, cpuid.ecx());
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emit_u32(builder, cpuid.edx());
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};
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append_brand_string_part_to_builder(0);
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append_brand_string_part_to_builder(1);
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append_brand_string_part_to_builder(2);
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auto string_view = builder.string_view();
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// NOTE: Unlike the vendor ID strings, the brand string isn't necessarily fixed length and might have a null terminator in it.
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// Try to find it and use a substring from 0 to that index, or the full length as a fallback.
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return KString::must_create(string_view.substring_view(0, string_view.find('\0').value_or(string_view.length())));
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}
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NonnullOwnPtr<KString> ProcessorInfo::build_features_string(Processor const& processor)
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{
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StringBuilder builder;
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bool first = true;
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for (auto feature = CPUFeature::Type(1u); feature != CPUFeature::__End; feature <<= 1u) {
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if (processor.has_feature(feature)) {
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if (first)
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first = false;
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else
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MUST(builder.try_append(' '));
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MUST(builder.try_append(cpu_feature_to_string_view(feature)));
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}
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}
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return KString::must_create(builder.string_view());
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}
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}
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