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// 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
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