Atmosphere/libraries/libmesosphere/source/arch/arm64/kern_k_hardware_timer.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
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namespace ams::kern::arch::arm64 {
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void KHardwareTimer::Initialize() {
/* Setup the global timer for the core. */
InitializeGlobalTimer();
/* Set maximum time. */
m_maximum_time = static_cast<s64>(std::min<u64>(std::numeric_limits<s64>::max(), cpu::CounterTimerPhysicalTimerCompareValueRegisterAccessor().GetCompareValue()));
/* Bind the interrupt task for this core. */
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Kernel::GetInterruptManager().BindHandler(this, KInterruptName_NonSecurePhysicalTimer, GetCurrentCoreId(), KInterruptController::PriorityLevel_Timer, true, true);
}
void KHardwareTimer::Finalize() {
/* Stop the hardware timer. */
StopTimer();
}
void KHardwareTimer::DoTask() {
/* Handle the interrupt. */
{
KScopedSchedulerLock slk;
KScopedSpinLock lk(this->GetLock());
/* Disable the timer interrupt while we handle this. */
DisableInterrupt();
if (const s64 next_time = this->DoInterruptTaskImpl(GetTick()); 0 < next_time && next_time <= m_maximum_time) {
/* We have a next time, so we should set the time to interrupt and turn the interrupt on. */
SetCompareValue(next_time);
EnableInterrupt();
}
}
/* Clear the timer interrupt. */
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Kernel::GetInterruptManager().ClearInterrupt(KInterruptName_NonSecurePhysicalTimer, GetCurrentCoreId());
}
}