63 lines
1.4 KiB
C++
63 lines
1.4 KiB
C++
// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <optional>
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#include "common/wall_clock.h"
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namespace Common {
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namespace X64 {
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class NativeClock final : public WallClock {
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public:
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explicit NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_,
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u64 rtsc_frequency_);
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std::chrono::nanoseconds GetTimeNS() override;
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std::chrono::microseconds GetTimeUS() override;
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std::chrono::milliseconds GetTimeMS() override;
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u64 GetClockCycles() override;
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u64 GetCPUCycles() override;
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void Pause(bool is_paused) override;
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private:
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u64 GetRTSC();
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union alignas(16) TimePoint {
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TimePoint() : pack{} {}
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u128 pack{};
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struct Inner {
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u64 last_measure{};
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u64 accumulated_ticks{};
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} inner;
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};
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/// value used to reduce the native clocks accuracy as some apss rely on
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/// undefined behavior where the level of accuracy in the clock shouldn't
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/// be higher.
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static constexpr u64 inaccuracy_mask = ~(UINT64_C(0x400) - 1);
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TimePoint time_point;
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// factors
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u64 clock_rtsc_factor{};
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u64 cpu_rtsc_factor{};
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u64 ns_rtsc_factor{};
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u64 us_rtsc_factor{};
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u64 ms_rtsc_factor{};
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u64 rtsc_frequency;
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};
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} // namespace X64
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u64 EstimateRDTSCFrequency();
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} // namespace Common
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