Merge pull request #11718 from liamwhite/arm64-native-clock
common: add arm64 native clock
This commit is contained in:
commit
b28b05e2aa
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@ -189,6 +189,14 @@ if(ARCHITECTURE_x86_64)
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target_link_libraries(common PRIVATE xbyak::xbyak)
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endif()
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if (ARCHITECTURE_arm64 AND (ANDROID OR LINUX))
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target_sources(common
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PRIVATE
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arm64/native_clock.cpp
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arm64/native_clock.h
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)
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endif()
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if (MSVC)
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target_compile_definitions(common PRIVATE
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# The standard library doesn't provide any replacement for codecvt yet
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@ -0,0 +1,72 @@
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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "common/arm64/native_clock.h"
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namespace Common::Arm64 {
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namespace {
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NativeClock::FactorType GetFixedPointFactor(u64 num, u64 den) {
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return (static_cast<NativeClock::FactorType>(num) << 64) / den;
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}
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u64 MultiplyHigh(u64 m, NativeClock::FactorType factor) {
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return static_cast<u64>((m * factor) >> 64);
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}
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} // namespace
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NativeClock::NativeClock() {
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const u64 host_cntfrq = GetHostCNTFRQ();
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ns_cntfrq_factor = GetFixedPointFactor(NsRatio::den, host_cntfrq);
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us_cntfrq_factor = GetFixedPointFactor(UsRatio::den, host_cntfrq);
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ms_cntfrq_factor = GetFixedPointFactor(MsRatio::den, host_cntfrq);
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guest_cntfrq_factor = GetFixedPointFactor(CNTFRQ, host_cntfrq);
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gputick_cntfrq_factor = GetFixedPointFactor(GPUTickFreq, host_cntfrq);
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}
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std::chrono::nanoseconds NativeClock::GetTimeNS() const {
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return std::chrono::nanoseconds{MultiplyHigh(GetHostTicksElapsed(), ns_cntfrq_factor)};
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}
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std::chrono::microseconds NativeClock::GetTimeUS() const {
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return std::chrono::microseconds{MultiplyHigh(GetHostTicksElapsed(), us_cntfrq_factor)};
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}
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std::chrono::milliseconds NativeClock::GetTimeMS() const {
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return std::chrono::milliseconds{MultiplyHigh(GetHostTicksElapsed(), ms_cntfrq_factor)};
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}
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u64 NativeClock::GetCNTPCT() const {
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return MultiplyHigh(GetHostTicksElapsed(), guest_cntfrq_factor);
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}
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u64 NativeClock::GetGPUTick() const {
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return MultiplyHigh(GetHostTicksElapsed(), gputick_cntfrq_factor);
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}
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u64 NativeClock::GetHostTicksNow() const {
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u64 cntvct_el0 = 0;
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asm volatile("dsb ish\n\t"
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"mrs %[cntvct_el0], cntvct_el0\n\t"
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"dsb ish\n\t"
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: [cntvct_el0] "=r"(cntvct_el0));
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return cntvct_el0;
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}
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u64 NativeClock::GetHostTicksElapsed() const {
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return GetHostTicksNow();
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}
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bool NativeClock::IsNative() const {
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return true;
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}
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u64 NativeClock::GetHostCNTFRQ() {
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u64 cntfrq_el0 = 0;
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asm("mrs %[cntfrq_el0], cntfrq_el0" : [cntfrq_el0] "=r"(cntfrq_el0));
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return cntfrq_el0;
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}
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} // namespace Common::Arm64
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@ -0,0 +1,47 @@
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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include "common/wall_clock.h"
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namespace Common::Arm64 {
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class NativeClock final : public WallClock {
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public:
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explicit NativeClock();
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std::chrono::nanoseconds GetTimeNS() const override;
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std::chrono::microseconds GetTimeUS() const override;
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std::chrono::milliseconds GetTimeMS() const override;
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u64 GetCNTPCT() const override;
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u64 GetGPUTick() const override;
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u64 GetHostTicksNow() const override;
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u64 GetHostTicksElapsed() const override;
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bool IsNative() const override;
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static u64 GetHostCNTFRQ();
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public:
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using FactorType = unsigned __int128;
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FactorType GetGuestCNTFRQFactor() const {
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return guest_cntfrq_factor;
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}
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private:
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FactorType ns_cntfrq_factor;
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FactorType us_cntfrq_factor;
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FactorType ms_cntfrq_factor;
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FactorType guest_cntfrq_factor;
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FactorType gputick_cntfrq_factor;
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};
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} // namespace Common::Arm64
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@ -10,6 +10,10 @@
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#include "common/x64/rdtsc.h"
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#endif
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#if defined(ARCHITECTURE_arm64) && defined(__linux__)
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#include "common/arm64/native_clock.h"
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#endif
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namespace Common {
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class StandardWallClock final : public WallClock {
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@ -53,7 +57,7 @@ private:
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};
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std::unique_ptr<WallClock> CreateOptimalClock() {
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#ifdef ARCHITECTURE_x86_64
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#if defined(ARCHITECTURE_x86_64)
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const auto& caps = GetCPUCaps();
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if (caps.invariant_tsc && caps.tsc_frequency >= std::nano::den) {
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@ -64,6 +68,8 @@ std::unique_ptr<WallClock> CreateOptimalClock() {
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// - Is not more precise than 1 GHz (1ns resolution)
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return std::make_unique<StandardWallClock>();
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}
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#elif defined(ARCHITECTURE_arm64) && defined(__linux__)
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return std::make_unique<Arm64::NativeClock>();
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#else
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return std::make_unique<StandardWallClock>();
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#endif
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