common: add arm64 native clock

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