diff options
Diffstat (limited to '')
-rw-r--r-- | src/common/x64/native_clock.cpp | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/src/common/x64/native_clock.cpp b/src/common/x64/native_clock.cpp index bc1a973b0..76c66e7ee 100644 --- a/src/common/x64/native_clock.cpp +++ b/src/common/x64/native_clock.cpp @@ -53,11 +53,11 @@ u64 EstimateRDTSCFrequency() { FencedRDTSC(); // Get the current time. - const auto start_time = Common::SteadyClock::Now(); + const auto start_time = Common::RealTimeClock::Now(); const u64 tsc_start = FencedRDTSC(); // Wait for 250 milliseconds. std::this_thread::sleep_for(std::chrono::milliseconds{250}); - const auto end_time = Common::SteadyClock::Now(); + const auto end_time = Common::RealTimeClock::Now(); const u64 tsc_end = FencedRDTSC(); // Calculate differences. const u64 timer_diff = static_cast<u64>( @@ -72,13 +72,29 @@ NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequen u64 rtsc_frequency_) : WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, true), rtsc_frequency{ rtsc_frequency_} { + // Thread to re-adjust the RDTSC frequency after 10 seconds has elapsed. + time_sync_thread = std::jthread{[this](std::stop_token token) { + // Get the current time. + const auto start_time = Common::RealTimeClock::Now(); + const u64 tsc_start = FencedRDTSC(); + // Wait for 10 seconds. + if (!Common::StoppableTimedWait(token, std::chrono::seconds{10})) { + return; + } + const auto end_time = Common::RealTimeClock::Now(); + const u64 tsc_end = FencedRDTSC(); + // Calculate differences. + const u64 timer_diff = static_cast<u64>( + std::chrono::duration_cast<std::chrono::nanoseconds>(end_time - start_time).count()); + const u64 tsc_diff = tsc_end - tsc_start; + const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff); + rtsc_frequency = tsc_freq; + CalculateAndSetFactors(); + }}; + time_point.inner.last_measure = FencedRDTSC(); time_point.inner.accumulated_ticks = 0U; - ns_rtsc_factor = GetFixedPoint64Factor(NS_RATIO, rtsc_frequency); - us_rtsc_factor = GetFixedPoint64Factor(US_RATIO, rtsc_frequency); - ms_rtsc_factor = GetFixedPoint64Factor(MS_RATIO, rtsc_frequency); - clock_rtsc_factor = GetFixedPoint64Factor(emulated_clock_frequency, rtsc_frequency); - cpu_rtsc_factor = GetFixedPoint64Factor(emulated_cpu_frequency, rtsc_frequency); + CalculateAndSetFactors(); } u64 NativeClock::GetRTSC() { @@ -138,6 +154,14 @@ u64 NativeClock::GetCPUCycles() { return MultiplyHigh(rtsc_value, cpu_rtsc_factor); } +void NativeClock::CalculateAndSetFactors() { + ns_rtsc_factor = GetFixedPoint64Factor(NS_RATIO, rtsc_frequency); + us_rtsc_factor = GetFixedPoint64Factor(US_RATIO, rtsc_frequency); + ms_rtsc_factor = GetFixedPoint64Factor(MS_RATIO, rtsc_frequency); + clock_rtsc_factor = GetFixedPoint64Factor(emulated_clock_frequency, rtsc_frequency); + cpu_rtsc_factor = GetFixedPoint64Factor(emulated_cpu_frequency, rtsc_frequency); +} + } // namespace X64 } // namespace Common |