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@ -13,7 +13,8 @@ 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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static constexpr u64 CNTFRQ = 19'200'000; // CNTPCT_EL0 Frequency = 19.2 MHz
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static constexpr u64 GPUTickFreq = 614'400'000; // GM20B GPU Tick Frequency = 614.4 MHz
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virtual ~WallClock() = default;
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@ -29,6 +30,9 @@ public:
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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 guest GPU ticks since the construction of this clock.
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virtual u64 GetGPUTick() 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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@ -46,6 +50,10 @@ public:
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return us * UsToCNTPCTRatio::num / UsToCNTPCTRatio::den;
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}
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static inline u64 NSToGPUTick(u64 ns) {
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return ns * NsToGPUTickRatio::num / NsToGPUTickRatio::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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@ -54,6 +62,14 @@ public:
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return cntpct * UsToCNTPCTRatio::den / UsToCNTPCTRatio::num;
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}
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static inline u64 GPUTickToNS(u64 gpu_tick) {
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return gpu_tick * NsToGPUTickRatio::den / NsToGPUTickRatio::num;
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}
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static inline u64 CNTPCTToGPUTick(u64 cntpct) {
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return cntpct * CNTPCTToGPUTickRatio::num / CNTPCTToGPUTickRatio::den;
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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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@ -63,6 +79,8 @@ protected:
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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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using NsToGPUTickRatio = std::ratio<GPUTickFreq, std::nano::den>;
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using CNTPCTToGPUTickRatio = std::ratio<GPUTickFreq, CNTFRQ>;
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};
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std::unique_ptr<WallClock> CreateOptimalClock();
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