8e56a84566
Previously, we were mixing the raw CPU frequency and CNTFRQ. The raw CPU frequency (1020 MHz) should've never been used as CNTPCT (whose frequency is CNTFRQ) is the only counter available.
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <chrono>
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#include <memory>
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#include <ratio>
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#include "common/common_types.h"
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namespace Common {
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class WallClock {
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public:
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static constexpr u64 CNTFRQ = 19'200'000; // CNTPCT_EL0 Frequency = 19.2 MHz
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virtual ~WallClock() = default;
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/// @returns The time in nanoseconds since the construction of this clock.
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virtual std::chrono::nanoseconds GetTimeNS() const = 0;
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/// @returns The time in microseconds since the construction of this clock.
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virtual std::chrono::microseconds GetTimeUS() const = 0;
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/// @returns The time in milliseconds since the construction of this clock.
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virtual std::chrono::milliseconds GetTimeMS() const = 0;
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/// @returns The guest CNTPCT ticks since the construction of this clock.
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virtual u64 GetCNTPCT() const = 0;
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/// @returns The raw host timer ticks since an indeterminate epoch.
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virtual u64 GetHostTicksNow() const = 0;
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/// @returns The raw host timer ticks since the construction of this clock.
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virtual u64 GetHostTicksElapsed() const = 0;
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/// @returns Whether the clock directly uses the host's hardware clock.
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virtual bool IsNative() const = 0;
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static inline u64 NSToCNTPCT(u64 ns) {
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return ns * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
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}
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static inline u64 USToCNTPCT(u64 us) {
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return us * UsToCNTPCTRatio::num / UsToCNTPCTRatio::den;
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}
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static inline u64 CNTPCTToNS(u64 cntpct) {
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return cntpct * NsToCNTPCTRatio::den / NsToCNTPCTRatio::num;
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}
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static inline u64 CNTPCTToUS(u64 cntpct) {
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return cntpct * UsToCNTPCTRatio::den / UsToCNTPCTRatio::num;
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}
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protected:
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using NsRatio = std::nano;
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using UsRatio = std::micro;
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using MsRatio = std::milli;
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using NsToUsRatio = std::ratio_divide<std::nano, std::micro>;
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using NsToMsRatio = std::ratio_divide<std::nano, std::milli>;
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using NsToCNTPCTRatio = std::ratio<CNTFRQ, std::nano::den>;
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using UsToCNTPCTRatio = std::ratio<CNTFRQ, std::micro::den>;
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};
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std::unique_ptr<WallClock> CreateOptimalClock();
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std::unique_ptr<WallClock> CreateStandardWallClock();
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} // namespace Common
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