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https://github.com/RGBCube/serenity
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545ce5b595
The platform independent Processor.h file includes the shared processor code and includes the specific platform header file. All references to the Arch/x86/Processor.h file have been replaced with a reference to Arch/Processor.h.
49 lines
994 B
C++
49 lines
994 B
C++
/*
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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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#include <AK/Types.h>
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#include <Kernel/Arch/Processor.h>
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#include <Kernel/Arch/x86/ASM_wrapper.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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#define XCR_XFEATURE_ENABLED_MASK 0
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UNMAP_AFTER_INIT u64 read_xcr0()
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{
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u32 eax, edx;
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asm volatile("xgetbv"
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: "=a"(eax), "=d"(edx)
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: "c"(XCR_XFEATURE_ENABLED_MASK));
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return eax + ((u64)edx << 32);
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}
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UNMAP_AFTER_INIT void write_xcr0(u64 value)
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{
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u32 eax = value;
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u32 edx = value >> 32;
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asm volatile("xsetbv" ::"a"(eax), "d"(edx), "c"(XCR_XFEATURE_ENABLED_MASK));
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}
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void stac()
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{
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if (!Processor::current().has_feature(CPUFeature::SMAP))
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return;
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asm volatile("stac" ::
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: "cc");
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}
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void clac()
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{
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if (!Processor::current().has_feature(CPUFeature::SMAP))
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return;
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asm volatile("clac" ::
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: "cc");
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}
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}
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