mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-26 22:51:12 +00:00
85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stratosphere.hpp>
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#include <mmsystem.h>
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namespace ams::os::impl {
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class TickManagerImpl {
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private:
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s64 m_tick_frequency;
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TimeSpan m_max_time;
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s64 m_max_tick;
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public:
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TickManagerImpl() {
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/* Get the tick frequency. */
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::timeBeginPeriod(1);
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LARGE_INTEGER freq;
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::QueryPerformanceFrequency(std::addressof(freq));
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m_tick_frequency = static_cast<s64>(freq.QuadPart);
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/* Set maximums. */
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constexpr s64 TickFrequencyForNanoSecondResolution = TimeSpan::FromSeconds(1).GetNanoSeconds();
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if (m_tick_frequency <= TickFrequencyForNanoSecondResolution) {
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m_max_tick = m_tick_frequency * (std::numeric_limits<s64>::max() / TickFrequencyForNanoSecondResolution);
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m_max_time = TimeSpan::FromNanoSeconds(std::numeric_limits<s64>::max());
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} else {
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m_max_tick = std::numeric_limits<s64>::max();
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m_max_time = TimeSpan::FromSeconds(std::numeric_limits<s64>::max() / m_tick_frequency);
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}
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}
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~TickManagerImpl() {
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::timeEndPeriod(1);
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}
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ALWAYS_INLINE Tick GetTick() const {
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LARGE_INTEGER freq;
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::QueryPerformanceCounter(std::addressof(freq));
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return Tick(static_cast<s64>(freq.QuadPart));
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}
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ALWAYS_INLINE Tick GetSystemTickOrdered() const {
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LARGE_INTEGER freq;
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PerformOrderingForGetSystemTickOrdered();
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::QueryPerformanceCounter(std::addressof(freq));
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PerformOrderingForGetSystemTickOrdered();
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return Tick(static_cast<s64>(freq.QuadPart));
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}
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ALWAYS_INLINE s64 GetTickFrequency() const {
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return m_tick_frequency;
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}
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ALWAYS_INLINE s64 GetMaxTick() const {
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return m_max_tick;
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}
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ALWAYS_INLINE s64 GetMaxTimeSpanNs() const {
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return m_max_time.GetNanoSeconds();
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}
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private:
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static ALWAYS_INLINE void PerformOrderingForGetSystemTickOrdered() {
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int a = 0, b, c = 0, d;
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__asm__ __volatile__("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(a), "2"(c) : "memory");
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}
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};
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}
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