117 lines
4.4 KiB
C++
Executable file
117 lines
4.4 KiB
C++
Executable file
// Copyright 2020 yuzu Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <array>
|
|
#include <chrono>
|
|
#include <limits>
|
|
#include <mutex>
|
|
#include <thread>
|
|
|
|
#include "common/atomic_ops.h"
|
|
#include "common/uint128.h"
|
|
#include "common/x64/native_clock.h"
|
|
|
|
namespace Common {
|
|
|
|
u64 EstimateRDTSCFrequency() {
|
|
const auto milli_10 = std::chrono::milliseconds{10};
|
|
// get current time
|
|
_mm_mfence();
|
|
const u64 tscStart = __rdtsc();
|
|
const auto startTime = std::chrono::high_resolution_clock::now();
|
|
// wait roughly 3 seconds
|
|
while (true) {
|
|
auto milli = std::chrono::duration_cast<std::chrono::milliseconds>(
|
|
std::chrono::high_resolution_clock::now() - startTime);
|
|
if (milli.count() >= 3000)
|
|
break;
|
|
std::this_thread::sleep_for(milli_10);
|
|
}
|
|
const auto endTime = std::chrono::high_resolution_clock::now();
|
|
_mm_mfence();
|
|
const u64 tscEnd = __rdtsc();
|
|
// calculate difference
|
|
const u64 timer_diff =
|
|
std::chrono::duration_cast<std::chrono::nanoseconds>(endTime - startTime).count();
|
|
const u64 tsc_diff = tscEnd - tscStart;
|
|
const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff);
|
|
return tsc_freq;
|
|
}
|
|
|
|
namespace X64 {
|
|
NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_,
|
|
u64 rtsc_frequency_)
|
|
: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, true), rtsc_frequency{
|
|
rtsc_frequency_} {
|
|
_mm_mfence();
|
|
time_point.inner.last_measure = __rdtsc();
|
|
time_point.inner.accumulated_ticks = 0U;
|
|
ns_rtsc_factor = GetFixedPoint64Factor(1000000000, rtsc_frequency);
|
|
us_rtsc_factor = GetFixedPoint64Factor(1000000, rtsc_frequency);
|
|
ms_rtsc_factor = GetFixedPoint64Factor(1000, rtsc_frequency);
|
|
clock_rtsc_factor = GetFixedPoint64Factor(emulated_clock_frequency, rtsc_frequency);
|
|
cpu_rtsc_factor = GetFixedPoint64Factor(emulated_cpu_frequency, rtsc_frequency);
|
|
}
|
|
|
|
u64 NativeClock::GetRTSC() {
|
|
TimePoint new_time_point{};
|
|
TimePoint current_time_point{};
|
|
do {
|
|
current_time_point.pack = time_point.pack;
|
|
_mm_mfence();
|
|
const u64 current_measure = __rdtsc();
|
|
u64 diff = current_measure - current_time_point.inner.last_measure;
|
|
diff = diff & ~static_cast<u64>(static_cast<s64>(diff) >> 63); // max(diff, 0)
|
|
new_time_point.inner.last_measure = current_measure > current_time_point.inner.last_measure
|
|
? current_measure
|
|
: current_time_point.inner.last_measure;
|
|
new_time_point.inner.accumulated_ticks = current_time_point.inner.accumulated_ticks + diff;
|
|
} while (!Common::AtomicCompareAndSwap(time_point.pack.data(), new_time_point.pack,
|
|
current_time_point.pack));
|
|
/// The clock cannot be more precise than the guest timer, remove the lower bits
|
|
return new_time_point.inner.accumulated_ticks & inaccuracy_mask;
|
|
}
|
|
|
|
void NativeClock::Pause(bool is_paused) {
|
|
if (!is_paused) {
|
|
TimePoint current_time_point{};
|
|
TimePoint new_time_point{};
|
|
do {
|
|
current_time_point.pack = time_point.pack;
|
|
new_time_point.pack = current_time_point.pack;
|
|
_mm_mfence();
|
|
new_time_point.inner.last_measure = __rdtsc();
|
|
} while (!Common::AtomicCompareAndSwap(time_point.pack.data(), new_time_point.pack,
|
|
current_time_point.pack));
|
|
}
|
|
}
|
|
|
|
std::chrono::nanoseconds NativeClock::GetTimeNS() {
|
|
const u64 rtsc_value = GetRTSC();
|
|
return std::chrono::nanoseconds{MultiplyHigh(rtsc_value, ns_rtsc_factor)};
|
|
}
|
|
|
|
std::chrono::microseconds NativeClock::GetTimeUS() {
|
|
const u64 rtsc_value = GetRTSC();
|
|
return std::chrono::microseconds{MultiplyHigh(rtsc_value, us_rtsc_factor)};
|
|
}
|
|
|
|
std::chrono::milliseconds NativeClock::GetTimeMS() {
|
|
const u64 rtsc_value = GetRTSC();
|
|
return std::chrono::milliseconds{MultiplyHigh(rtsc_value, ms_rtsc_factor)};
|
|
}
|
|
|
|
u64 NativeClock::GetClockCycles() {
|
|
const u64 rtsc_value = GetRTSC();
|
|
return MultiplyHigh(rtsc_value, clock_rtsc_factor);
|
|
}
|
|
|
|
u64 NativeClock::GetCPUCycles() {
|
|
const u64 rtsc_value = GetRTSC();
|
|
return MultiplyHigh(rtsc_value, cpu_rtsc_factor);
|
|
}
|
|
|
|
} // namespace X64
|
|
|
|
} // namespace Common
|