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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/steady_clock.h"
#include "common/uint128.h"
#include "common/wall_clock.h"
#ifdef __ANDROID__
#include <sys/system_properties.h>
#endif
#ifdef ARCHITECTURE_x86_64
#include "common/x64/cpu_detect.h"
#include "common/x64/rdtsc.h"
#endif
namespace Common {
#if defined(ARCHITECTURE_x86_64)
WallClock::WallClock(bool invariant_, u64 rdtsc_frequency_) noexcept
: invariant{invariant_}
, rdtsc_frequency{rdtsc_frequency_}
, ns_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(NsRatio::den, rdtsc_frequency_)}
, us_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(UsRatio::den, rdtsc_frequency_)}
, ms_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(MsRatio::den, rdtsc_frequency_)}
, cntpct_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(CNTFRQ, rdtsc_frequency_)}
, gputick_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(GPUTickFreq, rdtsc_frequency_)}
{}
std::chrono::nanoseconds WallClock::GetTimeNS() const {
if (invariant)
return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::system_clock::now().time_since_epoch());
return std::chrono::nanoseconds{MultiplyHigh(GetUptime(), ns_rdtsc_factor)};
}
std::chrono::microseconds WallClock::GetTimeUS() const {
if (invariant)
return std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch());
return std::chrono::microseconds{MultiplyHigh(GetUptime(), us_rdtsc_factor)};
}
std::chrono::milliseconds WallClock::GetTimeMS() const {
if (invariant)
return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch());
return std::chrono::milliseconds{MultiplyHigh(GetUptime(), ms_rdtsc_factor)};
}
s64 WallClock::GetCNTPCT() const {
if (invariant)
return GetUptime() * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
return MultiplyHigh(GetUptime(), cntpct_rdtsc_factor);
}
s64 WallClock::GetGPUTick() const {
if (invariant)
return GetUptime() * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
return MultiplyHigh(GetUptime(), gputick_rdtsc_factor);
}
s64 WallClock::GetUptime() const {
if (invariant)
return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::steady_clock::now().time_since_epoch()).count();
return s64(Common::X64::FencedRDTSC());
}
bool WallClock::IsNative() const {
if (invariant)
return false;
return true;
}
#elif defined(HAS_NCE)
namespace {
[[nodiscard]] WallClock::FactorType GetFixedPointFactor(u64 num, u64 den) noexcept {
return (WallClock::FactorType(num) << 64) / den;
}
[[nodiscard]] u64 MultiplyHigh(u64 m, WallClock::FactorType factor) noexcept {
return static_cast<u64>((m * factor) >> 64);
}
[[nodiscard]] s64 GetHostCNTFRQ() noexcept {
u64 cntfrq_el0 = 0;
#ifdef ANDROID
std::string_view board{""};
char buffer[PROP_VALUE_MAX];
int len{__system_property_get("ro.product.board", buffer)};
board = std::string_view(buffer, static_cast<size_t>(len));
if (board == "s5e9925") { // Exynos 2200
cntfrq_el0 = 25600000;
} else if (board == "exynos2100") { // Exynos 2100
cntfrq_el0 = 26000000;
} else if (board == "exynos9810") { // Exynos 9810
cntfrq_el0 = 26000000;
} else if (board == "s5e8825") { // Exynos 1280
cntfrq_el0 = 26000000;
} else {
asm volatile("mrs %[cntfrq_el0], cntfrq_el0" : [cntfrq_el0] "=r"(cntfrq_el0));
}
return cntfrq_el0;
#else
asm volatile("mrs %[cntfrq_el0], cntfrq_el0" : [cntfrq_el0] "=r"(cntfrq_el0));
return cntfrq_el0;
#endif
}
} // namespace
WallClock::WallClock(bool invariant_, u64 rdtsc_frequency_) noexcept {
const u64 host_cntfrq = std::max<u64>(GetHostCNTFRQ(), 1);
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 WallClock::GetTimeNS() const {
return std::chrono::nanoseconds{MultiplyHigh(GetUptime(), ns_cntfrq_factor)};
}
std::chrono::microseconds WallClock::GetTimeUS() const {
return std::chrono::microseconds{MultiplyHigh(GetUptime(), us_cntfrq_factor)};
}
std::chrono::milliseconds WallClock::GetTimeMS() const {
return std::chrono::milliseconds{MultiplyHigh(GetUptime(), ms_cntfrq_factor)};
}
s64 WallClock::GetCNTPCT() const {
return MultiplyHigh(GetUptime(), guest_cntfrq_factor);
}
s64 WallClock::GetGPUTick() const {
return MultiplyHigh(GetUptime(), gputick_cntfrq_factor);
}
s64 WallClock::GetUptime() const {
s64 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;
}
bool WallClock::IsNative() const {
return true;
}
#else
WallClock::WallClock(bool invariant_, u64 rdtsc_frequency_) noexcept {}
std::chrono::nanoseconds WallClock::GetTimeNS() const {
return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::system_clock::now().time_since_epoch());
}
std::chrono::microseconds WallClock::GetTimeUS() const {
return std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch());
}
std::chrono::milliseconds WallClock::GetTimeMS() const {
return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch());
}
s64 WallClock::GetCNTPCT() const {
return GetUptime() * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
}
s64 WallClock::GetGPUTick() const {
return GetUptime() * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
}
s64 WallClock::GetUptime() const {
return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::steady_clock::now().time_since_epoch()).count();
}
bool WallClock::IsNative() const {
return false;
}
#endif
WallClock CreateOptimalClock() noexcept {
#if defined(ARCHITECTURE_x86_64)
auto const& caps = GetCPUCaps();
return WallClock(!(caps.invariant_tsc && caps.tsc_frequency >= std::nano::den), caps.tsc_frequency);
#elif defined(HAS_NCE)
return WallClock(false, 1);
#else
return WallClock(true, 1);
#endif
}
} // namespace Common
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