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// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cstdint>
#include "common/uint128.h"
#include "common/wall_clock.h"
#ifdef ARCHITECTURE_x86_64
#include "common/x64/cpu_detect.h"
#include "common/x64/native_clock.h"
#endif
namespace Common {
using base_timer = std::chrono::steady_clock;
using base_time_point = std::chrono::time_point<base_timer>;
class StandardWallClock final : public WallClock {
public:
explicit StandardWallClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_)
: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, false),
emulated_clock_factor{GetFixedPoint64Factor(emulated_clock_frequency, 1000000000)},
emulated_cpu_factor{GetFixedPoint64Factor(emulated_cpu_frequency, 1000000000)} {
start_time = base_timer::now();
}
std::chrono::nanoseconds GetTimeNS() override {
base_time_point current = base_timer::now();
auto elapsed = current - start_time;
return std::chrono::duration_cast<std::chrono::nanoseconds>(elapsed);
}
std::chrono::microseconds GetTimeUS() override {
base_time_point current = base_timer::now();
auto elapsed = current - start_time;
return std::chrono::duration_cast<std::chrono::microseconds>(elapsed);
}
std::chrono::milliseconds GetTimeMS() override {
base_time_point current = base_timer::now();
auto elapsed = current - start_time;
return std::chrono::duration_cast<std::chrono::milliseconds>(elapsed);
}
u64 GetClockCycles() override {
return MultiplyHigh(GetTimeNS().count(), emulated_clock_factor);
}
u64 GetCPUCycles() override {
return MultiplyHigh(GetTimeNS().count(), emulated_cpu_factor);
}
void Pause([[maybe_unused]] bool is_paused) override {
// Do nothing in this clock type.
}
private:
base_time_point start_time;
const u64 emulated_clock_factor;
const u64 emulated_cpu_factor;
};
#ifdef ARCHITECTURE_x86_64
std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
u32 emulated_clock_frequency) {
const auto& caps = GetCPUCaps();
u64 rtsc_frequency = 0;
if (caps.invariant_tsc) {
rtsc_frequency = EstimateRDTSCFrequency();
}
if (rtsc_frequency == 0) {
return std::make_unique<StandardWallClock>(emulated_cpu_frequency,
emulated_clock_frequency);
} else {
return std::make_unique<X64::NativeClock>(emulated_cpu_frequency, emulated_clock_frequency,
rtsc_frequency);
}
}
#else
std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
u32 emulated_clock_frequency) {
return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency);
}
#endif
} // namespace Common
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