mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 09:12:45 +00:00
38fca26f54
This adds just enough stubs to make the kernel compile on x86_64. Obviously it won't do anything useful - in fact it won't even attempt to boot because Multiboot doesn't support ELF64 binaries - but it gets those compiler errors out of the way so more progress can be made getting all the missing functionality in place.
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@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/x86/CPUID.h>
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#include <Kernel/Arch/x86/Processor.h>
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#include <Kernel/Arch/x86/ProcessorInfo.h>
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namespace Kernel {
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ProcessorInfo::ProcessorInfo(Processor& processor)
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: m_processor(processor)
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{
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u32 max_leaf;
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{
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CPUID cpuid(0);
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StringBuilder builder;
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auto emit_u32 = [&](u32 value) {
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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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max_leaf = cpuid.eax();
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emit_u32(cpuid.ebx());
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emit_u32(cpuid.edx());
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emit_u32(cpuid.ecx());
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m_cpuid = builder.build();
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}
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{
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VERIFY(max_leaf >= 1);
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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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u32 max_extended_leaf = CPUID(0x80000000).eax();
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if (max_extended_leaf >= 0x80000004) {
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alignas(u32) char buffer[48];
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u32* bufptr = reinterpret_cast<u32*>(buffer);
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auto copy_brand_string_part_to_buffer = [&](u32 i) {
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CPUID cpuid(0x80000002 + i);
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*bufptr++ = cpuid.eax();
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*bufptr++ = cpuid.ebx();
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*bufptr++ = cpuid.ecx();
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*bufptr++ = cpuid.edx();
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};
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copy_brand_string_part_to_buffer(0);
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copy_brand_string_part_to_buffer(1);
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copy_brand_string_part_to_buffer(2);
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m_brandstr = buffer;
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}
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// Cache the CPU feature string
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m_features = m_processor.features_string();
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}
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}
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