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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-FileCopyrightText: Copyright 2013 Dolphin Emulator Project / 2015 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <optional>
#include <string_view>
#include <chrono>
#include <memory>
#include <ratio>
#include "common/common_types.h"
namespace Common {
class WallClock {
public:
static constexpr u64 CNTFRQ = 19'200'000; // CNTPCT_EL0 Frequency = 19.2 MHz
static constexpr u64 GPUTickFreq = 614'400'000; // GM20B GPU Tick Frequency = 614.4 MHz
static constexpr u64 CPUTickFreq = 1'020'000'000; // T210/4 A57 CPU Tick Frequency = 1020.0 MHz
explicit WallClock(bool invariant, u64 rdtsc_frequency_) noexcept;
/// @returns The time in nanoseconds since the construction of this clock.
std::chrono::nanoseconds GetTimeNS() const;
/// @returns The time in microseconds since the construction of this clock.
std::chrono::microseconds GetTimeUS() const;
/// @returns The time in milliseconds since the construction of this clock.
std::chrono::milliseconds GetTimeMS() const;
/// @returns The guest CNTPCT ticks since the construction of this clock.
s64 GetCNTPCT() const;
/// @returns The guest GPU ticks since the construction of this clock.
s64 GetGPUTick() const;
/// @returns The raw host timer ticks since an indeterminate epoch.
s64 GetUptime() const;
/// @returns Whether the clock directly uses the host's hardware clock.
bool IsNative() const;
// @returns Nanoseconds to native ticks
u64 NsToTicks(std::chrono::nanoseconds ns) const;
static inline u64 NSToCNTPCT(u64 ns) {
return ns * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
}
static inline u64 NSToGPUTick(u64 ns) {
return ns * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
}
// Cycle Timing
static inline u64 CPUTickToNS(u64 cpu_tick) {
return cpu_tick * CPUTickToNsRatio::num / CPUTickToNsRatio::den;
}
static inline u64 CPUTickToUS(u64 cpu_tick) {
return cpu_tick * CPUTickToUsRatio::num / CPUTickToUsRatio::den;
}
static inline u64 CPUTickToCNTPCT(u64 cpu_tick) {
return cpu_tick * CPUTickToCNTPCTRatio::num / CPUTickToCNTPCTRatio::den;
}
static inline u64 CPUTickToGPUTick(u64 cpu_tick) {
return cpu_tick * CPUTickToGPUTickRatio::num / CPUTickToGPUTickRatio::den;
}
using NsRatio = std::nano;
using UsRatio = std::micro;
using MsRatio = std::milli;
using NsToUsRatio = std::ratio_divide<std::nano, std::micro>;
using NsToMsRatio = std::ratio_divide<std::nano, std::milli>;
using NsToCNTPCTRatio = std::ratio<CNTFRQ, std::nano::den>;
using NsToGPUTickRatio = std::ratio<GPUTickFreq, std::nano::den>;
// Cycle Timing
using CPUTickToNsRatio = std::ratio<std::nano::den, CPUTickFreq>;
using CPUTickToUsRatio = std::ratio<std::micro::den, CPUTickFreq>;
using CPUTickToCNTPCTRatio = std::ratio<CNTFRQ, CPUTickFreq>;
using CPUTickToGPUTickRatio = std::ratio<GPUTickFreq, CPUTickFreq>;
#if defined(ARCHITECTURE_x86_64)
u64 rdtsc_frequency;
u64 ns_rdtsc_factor;
u64 us_rdtsc_factor;
u64 ms_rdtsc_factor;
u64 rdtsc_ns_integer;
u64 rdtsc_ns_factor;
u64 cntpct_rdtsc_factor;
u64 gputick_rdtsc_factor;
bool invariant;
#elif defined(HAS_NCE)
using FactorType = unsigned __int128;
[[nodiscard]] inline FactorType GetGuestCNTFRQFactor() const {
return guest_cntfrq_factor;
}
FactorType ns_cntfrq_factor;
FactorType us_cntfrq_factor;
FactorType ms_cntfrq_factor;
FactorType cntfrq_ns_factor;
FactorType guest_cntfrq_factor;
FactorType gputick_cntfrq_factor;
#endif
};
#ifdef ARCHITECTURE_x86_64
/// x86/x64 CPU capabilities that may be detected by this module
struct CPUCaps {
enum class Manufacturer : u8 {
Unknown = 0,
Intel = 1,
AMD = 2,
Hygon = 3,
};
static Manufacturer ParseManufacturer(std::string_view brand_string);
Manufacturer manufacturer;
char brand_string[13];
char cpu_string[48];
u32 base_frequency;
u32 max_frequency;
u32 bus_frequency;
u32 tsc_crystal_ratio_denominator;
u32 tsc_crystal_ratio_numerator;
u32 crystal_frequency;
u64 tsc_frequency; // Derived from the above three values
bool sse3 : 1;
bool ssse3 : 1;
bool sse4_1 : 1;
bool sse4_2 : 1;
bool avx : 1;
bool avx2 : 1;
bool avx512f : 1;
bool avx512dq : 1;
bool avx512cd : 1;
bool avx512bw : 1;
bool avx512vl : 1;
bool avx512vbmi : 1;
bool avx512bitalg : 1;
bool aes : 1;
bool bmi1 : 1;
bool bmi2 : 1;
bool f16c : 1;
bool fma : 1;
bool gfni : 1;
bool invariant_tsc : 1;
bool lzcnt : 1;
bool monitorx : 1;
bool movbe : 1;
bool pclmulqdq : 1;
bool popcnt : 1;
bool sha : 1;
bool waitpkg : 1;
};
#else
struct CPUCaps {
bool padding;
};
#endif
/// Detects CPU core count
std::optional<int> GetProcessorCount();
/// @brief Global cpu caps
extern const CPUCaps g_cpu_caps;
/// @brief Global wall clock
extern const WallClock g_wall_clock;
} // namespace Common
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