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Kernel: Reorganize Arch/x86 directory to Arch/x86_64 after i686 removal
No functional change.
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commit
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129 changed files with 482 additions and 1116 deletions
53
Kernel/Arch/x86_64/MSR.h
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53
Kernel/Arch/x86_64/MSR.h
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/*
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* Copyright (c) 2018-2021, 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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#pragma once
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#include <AK/Types.h>
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#include <Kernel/Arch/x86_64/CPUID.h>
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#include <AK/Platform.h>
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VALIDATE_IS_X86()
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namespace Kernel {
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class MSR {
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uint32_t m_msr;
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public:
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static bool have()
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{
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CPUID id(1);
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return (id.edx() & (1 << 5)) != 0;
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}
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MSR(const MSR&) = delete;
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MSR& operator=(const MSR&) = delete;
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MSR(uint32_t msr)
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: m_msr(msr)
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{
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}
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[[nodiscard]] u64 get()
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{
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u32 low, high;
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asm volatile("rdmsr"
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: "=a"(low), "=d"(high)
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: "c"(m_msr));
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return ((u64)high << 32) | low;
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}
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void set(u64 value)
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{
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u32 low = value & 0xffffffff;
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u32 high = value >> 32;
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asm volatile("wrmsr" ::"a"(low), "d"(high), "c"(m_msr));
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}
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};
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}
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