mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
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67 lines
2.6 KiB
C++
67 lines
2.6 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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namespace ams::os::impl {
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class TickManagerImpl {
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public:
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constexpr TickManagerImpl() { /* ... */ }
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ALWAYS_INLINE Tick GetTick() const {
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s64 tick;
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#if defined(ATMOSPHERE_ARCH_ARM64)
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__asm__ __volatile__("mrs %[tick], cntpct_el0" : [tick]"=&r"(tick) :: "memory");
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#else
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#error "Unknown Architecture for TickManagerImpl::GetTick"
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#endif
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return Tick(tick);
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}
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ALWAYS_INLINE Tick GetSystemTickOrdered() const {
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s64 tick;
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#if defined(ATMOSPHERE_ARCH_ARM64)
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__asm__ __volatile__("dsb ish\n"
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"isb\n"
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"mrs %[tick], cntpct_el0\n"
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"isb"
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: [tick]"=&r"(tick)
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:
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: "memory");
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#else
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#error "Unknown Architecture for TickManagerImpl::GetSystemTickOrdered"
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#endif
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return Tick(tick);
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}
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static constexpr ALWAYS_INLINE s64 GetTickFrequency() {
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return static_cast<s64>(::ams::svc::TicksPerSecond);
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}
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static constexpr ALWAYS_INLINE s64 GetMaxTick() {
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static_assert(GetTickFrequency() <= TimeSpan::FromSeconds(1).GetNanoSeconds());
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return (std::numeric_limits<s64>::max() / TimeSpan::FromSeconds(1).GetNanoSeconds()) * GetTickFrequency();
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}
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static constexpr ALWAYS_INLINE s64 GetMaxTimeSpanNs() {
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static_assert(GetTickFrequency() <= TimeSpan::FromSeconds(1).GetNanoSeconds());
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return TimeSpan::FromNanoSeconds(std::numeric_limits<s64>::max()).GetNanoSeconds();
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}
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};
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}
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