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28 lines
632 B
C++
28 lines
632 B
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/CurrentTime.h>
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#include <Kernel/Arch/x86_64/ASM_wrapper.h>
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#include <Kernel/Arch/x86_64/Processor.h>
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namespace Kernel {
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static u64 current_time_tsc()
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{
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return read_tsc();
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}
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fptr optional_current_time()
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{
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VERIFY(Processor::is_initialized()); // sanity check
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// Figure out a good scheduling time source
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if (Processor::current().has_feature(CPUFeature::TSC) && Processor::current().has_feature(CPUFeature::CONSTANT_TSC)) {
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return current_time_tsc;
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}
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return nullptr;
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}
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}
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