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-rw-r--r--src/common/wall_clock.h89
1 files changed, 61 insertions, 28 deletions
diff --git a/src/common/wall_clock.h b/src/common/wall_clock.h
index 157ec5eae..f45d3d8c5 100644
--- a/src/common/wall_clock.h
+++ b/src/common/wall_clock.h
@@ -5,6 +5,7 @@
#include <chrono>
#include <memory>
+#include <ratio>
#include "common/common_types.h"
@@ -12,50 +13,82 @@ namespace Common {
class WallClock {
public:
- static constexpr u64 NS_RATIO = 1'000'000'000;
- static constexpr u64 US_RATIO = 1'000'000;
- static constexpr u64 MS_RATIO = 1'000;
+ static constexpr u64 CNTFRQ = 19'200'000; // CNTPCT_EL0 Frequency = 19.2 MHz
+ static constexpr u64 GPUTickFreq = 614'400'000; // GM20B GPU Tick Frequency = 614.4 MHz
+ static constexpr u64 CPUTickFreq = 1'020'000'000; // T210/4 A57 CPU Tick Frequency = 1020.0 MHz
virtual ~WallClock() = default;
- /// Returns current wall time in nanoseconds
- [[nodiscard]] virtual std::chrono::nanoseconds GetTimeNS() = 0;
+ /// @returns The time in nanoseconds since the construction of this clock.
+ virtual std::chrono::nanoseconds GetTimeNS() const = 0;
- /// Returns current wall time in microseconds
- [[nodiscard]] virtual std::chrono::microseconds GetTimeUS() = 0;
+ /// @returns The time in microseconds since the construction of this clock.
+ virtual std::chrono::microseconds GetTimeUS() const = 0;
- /// Returns current wall time in milliseconds
- [[nodiscard]] virtual std::chrono::milliseconds GetTimeMS() = 0;
+ /// @returns The time in milliseconds since the construction of this clock.
+ virtual std::chrono::milliseconds GetTimeMS() const = 0;
- /// Returns current wall time in emulated clock cycles
- [[nodiscard]] virtual u64 GetClockCycles() = 0;
+ /// @returns The guest CNTPCT ticks since the construction of this clock.
+ virtual u64 GetCNTPCT() const = 0;
- /// Returns current wall time in emulated cpu cycles
- [[nodiscard]] virtual u64 GetCPUCycles() = 0;
+ /// @returns The guest GPU ticks since the construction of this clock.
+ virtual u64 GetGPUTick() const = 0;
- virtual void Pause(bool is_paused) = 0;
+ /// @returns The raw host timer ticks since an indeterminate epoch.
+ virtual u64 GetHostTicksNow() const = 0;
- /// Tells if the wall clock, uses the host CPU's hardware clock
- [[nodiscard]] bool IsNative() const {
- return is_native;
+ /// @returns The raw host timer ticks since the construction of this clock.
+ virtual u64 GetHostTicksElapsed() const = 0;
+
+ /// @returns Whether the clock directly uses the host's hardware clock.
+ virtual bool IsNative() const = 0;
+
+ static inline u64 NSToCNTPCT(u64 ns) {
+ return ns * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
+ }
+
+ static inline u64 NSToGPUTick(u64 ns) {
+ return ns * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
+ }
+
+ // Cycle Timing
+
+ static inline u64 CPUTickToNS(u64 cpu_tick) {
+ return cpu_tick * CPUTickToNsRatio::num / CPUTickToNsRatio::den;
+ }
+
+ static inline u64 CPUTickToUS(u64 cpu_tick) {
+ return cpu_tick * CPUTickToUsRatio::num / CPUTickToUsRatio::den;
+ }
+
+ static inline u64 CPUTickToCNTPCT(u64 cpu_tick) {
+ return cpu_tick * CPUTickToCNTPCTRatio::num / CPUTickToCNTPCTRatio::den;
+ }
+
+ static inline u64 CPUTickToGPUTick(u64 cpu_tick) {
+ return cpu_tick * CPUTickToGPUTickRatio::num / CPUTickToGPUTickRatio::den;
}
protected:
- explicit WallClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_, bool is_native_)
- : emulated_cpu_frequency{emulated_cpu_frequency_},
- emulated_clock_frequency{emulated_clock_frequency_}, is_native{is_native_} {}
+ using NsRatio = std::nano;
+ using UsRatio = std::micro;
+ using MsRatio = std::milli;
+
+ using NsToUsRatio = std::ratio_divide<std::nano, std::micro>;
+ using NsToMsRatio = std::ratio_divide<std::nano, std::milli>;
+ using NsToCNTPCTRatio = std::ratio<CNTFRQ, std::nano::den>;
+ using NsToGPUTickRatio = std::ratio<GPUTickFreq, std::nano::den>;
- u64 emulated_cpu_frequency;
- u64 emulated_clock_frequency;
+ // Cycle Timing
-private:
- bool is_native;
+ using CPUTickToNsRatio = std::ratio<std::nano::den, CPUTickFreq>;
+ using CPUTickToUsRatio = std::ratio<std::micro::den, CPUTickFreq>;
+ using CPUTickToCNTPCTRatio = std::ratio<CNTFRQ, CPUTickFreq>;
+ using CPUTickToGPUTickRatio = std::ratio<GPUTickFreq, CPUTickFreq>;
};
-[[nodiscard]] std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
- u64 emulated_clock_frequency);
+std::unique_ptr<WallClock> CreateOptimalClock();
-[[nodiscard]] std::unique_ptr<WallClock> CreateStandardWallClock(u64 emulated_cpu_frequency,
- u64 emulated_clock_frequency);
+std::unique_ptr<WallClock> CreateStandardWallClock();
} // namespace Common