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-rw-r--r--src/common/arm64/native_clock.cpp72
-rw-r--r--src/common/arm64/native_clock.h47
2 files changed, 119 insertions, 0 deletions
diff --git a/src/common/arm64/native_clock.cpp b/src/common/arm64/native_clock.cpp
new file mode 100644
index 000000000..88fdba527
--- /dev/null
+++ b/src/common/arm64/native_clock.cpp
@@ -0,0 +1,72 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/arm64/native_clock.h"
+
+namespace Common::Arm64 {
+
+namespace {
+
+NativeClock::FactorType GetFixedPointFactor(u64 num, u64 den) {
+ return (static_cast<NativeClock::FactorType>(num) << 64) / den;
+}
+
+u64 MultiplyHigh(u64 m, NativeClock::FactorType factor) {
+ return static_cast<u64>((m * factor) >> 64);
+}
+
+} // namespace
+
+NativeClock::NativeClock() {
+ const u64 host_cntfrq = GetHostCNTFRQ();
+ ns_cntfrq_factor = GetFixedPointFactor(NsRatio::den, host_cntfrq);
+ us_cntfrq_factor = GetFixedPointFactor(UsRatio::den, host_cntfrq);
+ ms_cntfrq_factor = GetFixedPointFactor(MsRatio::den, host_cntfrq);
+ guest_cntfrq_factor = GetFixedPointFactor(CNTFRQ, host_cntfrq);
+ gputick_cntfrq_factor = GetFixedPointFactor(GPUTickFreq, host_cntfrq);
+}
+
+std::chrono::nanoseconds NativeClock::GetTimeNS() const {
+ return std::chrono::nanoseconds{MultiplyHigh(GetHostTicksElapsed(), ns_cntfrq_factor)};
+}
+
+std::chrono::microseconds NativeClock::GetTimeUS() const {
+ return std::chrono::microseconds{MultiplyHigh(GetHostTicksElapsed(), us_cntfrq_factor)};
+}
+
+std::chrono::milliseconds NativeClock::GetTimeMS() const {
+ return std::chrono::milliseconds{MultiplyHigh(GetHostTicksElapsed(), ms_cntfrq_factor)};
+}
+
+u64 NativeClock::GetCNTPCT() const {
+ return MultiplyHigh(GetHostTicksElapsed(), guest_cntfrq_factor);
+}
+
+u64 NativeClock::GetGPUTick() const {
+ return MultiplyHigh(GetHostTicksElapsed(), gputick_cntfrq_factor);
+}
+
+u64 NativeClock::GetHostTicksNow() const {
+ u64 cntvct_el0 = 0;
+ asm volatile("dsb ish\n\t"
+ "mrs %[cntvct_el0], cntvct_el0\n\t"
+ "dsb ish\n\t"
+ : [cntvct_el0] "=r"(cntvct_el0));
+ return cntvct_el0;
+}
+
+u64 NativeClock::GetHostTicksElapsed() const {
+ return GetHostTicksNow();
+}
+
+bool NativeClock::IsNative() const {
+ return true;
+}
+
+u64 NativeClock::GetHostCNTFRQ() {
+ u64 cntfrq_el0 = 0;
+ asm("mrs %[cntfrq_el0], cntfrq_el0" : [cntfrq_el0] "=r"(cntfrq_el0));
+ return cntfrq_el0;
+}
+
+} // namespace Common::Arm64
diff --git a/src/common/arm64/native_clock.h b/src/common/arm64/native_clock.h
new file mode 100644
index 000000000..a28b419f2
--- /dev/null
+++ b/src/common/arm64/native_clock.h
@@ -0,0 +1,47 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/wall_clock.h"
+
+namespace Common::Arm64 {
+
+class NativeClock final : public WallClock {
+public:
+ explicit NativeClock();
+
+ std::chrono::nanoseconds GetTimeNS() const override;
+
+ std::chrono::microseconds GetTimeUS() const override;
+
+ std::chrono::milliseconds GetTimeMS() const override;
+
+ u64 GetCNTPCT() const override;
+
+ u64 GetGPUTick() const override;
+
+ u64 GetHostTicksNow() const override;
+
+ u64 GetHostTicksElapsed() const override;
+
+ bool IsNative() const override;
+
+ static u64 GetHostCNTFRQ();
+
+public:
+ using FactorType = unsigned __int128;
+
+ FactorType GetGuestCNTFRQFactor() const {
+ return guest_cntfrq_factor;
+ }
+
+private:
+ FactorType ns_cntfrq_factor;
+ FactorType us_cntfrq_factor;
+ FactorType ms_cntfrq_factor;
+ FactorType guest_cntfrq_factor;
+ FactorType gputick_cntfrq_factor;
+};
+
+} // namespace Common::Arm64