mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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146 lines
4.8 KiB
C++
146 lines
4.8 KiB
C++
/*
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* Copyright (c) 2018-2020 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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#include <mesosphere.hpp>
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namespace ams::kern {
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namespace {
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constinit KLightLock g_interrupt_event_lock;
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constinit KInterruptEventTask *g_interrupt_event_task_table[KInterruptController::NumInterrupts] = {};
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}
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Result KInterruptEvent::Initialize(int32_t interrupt_name, ams::svc::InterruptType type) {
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MESOSPHERE_ASSERT_THIS();
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/* Set interrupt id. */
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this->interrupt_id = interrupt_name;
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/* Initialize readable event base. */
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KReadableEvent::Initialize(nullptr);
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/* Try to register the task. */
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R_TRY(KInterruptEventTask::Register(std::addressof(this->task), this->interrupt_id, type == ams::svc::InterruptType_Level, this));
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/* Mark initialized. */
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this->is_initialized = true;
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return ResultSuccess();
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}
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void KInterruptEvent::Finalize() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(this->task != nullptr);
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this->task->Unregister();
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}
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Result KInterruptEvent::Reset() {
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MESOSPHERE_ASSERT_THIS();
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/* Lock the task table. */
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KScopedLightLock lk(g_interrupt_event_lock);
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/* Clear the event. */
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R_TRY(KReadableEvent::Reset());
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/* Clear the interrupt. */
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Kernel::GetInterruptManager().ClearInterrupt(this->interrupt_id);
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return ResultSuccess();
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}
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Result KInterruptEventTask::Register(KInterruptEventTask **out, s32 interrupt_id, bool level, KInterruptEvent *event) {
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/* Verify the interrupt id is defined and global. */
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R_UNLESS(Kernel::GetInterruptManager().IsInterruptDefined(interrupt_id), svc::ResultOutOfRange());
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R_UNLESS(Kernel::GetInterruptManager().IsGlobal(interrupt_id), svc::ResultOutOfRange());
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/* Lock the task table. */
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KScopedLightLock lk(g_interrupt_event_lock);
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/* Get a task for the id. */
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bool allocated = false;
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KInterruptEventTask *task = g_interrupt_event_task_table[interrupt_id];
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if (task != nullptr) {
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/* Check that there's not already an event for this task. */
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R_UNLESS(task->event == nullptr, svc::ResultBusy());
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} else {
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/* Allocate a new task. */
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task = KInterruptEventTask::Allocate();
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R_UNLESS(task != nullptr, svc::ResultOutOfResource());
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allocated = true;
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}
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/* Register/bind the interrupt task. */
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{
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/* Ensure that the task is cleaned up if anything goes wrong. */
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auto task_guard = SCOPE_GUARD { if (allocated) { KInterruptEventTask::Free(task); } };
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/* Bind the interrupt handler. */
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R_TRY(Kernel::GetInterruptManager().BindHandler(task, interrupt_id, GetCurrentCoreId(), KInterruptController::PriorityLevel_High, true, level));
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/* We successfully registered, so we don't need to free the task. */
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task_guard.Cancel();
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}
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/* Set the event. */
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task->event = event;
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/* If we allocated, set the event in the table. */
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if (allocated) {
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task->interrupt_id = interrupt_id;
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g_interrupt_event_task_table[interrupt_id] = task;
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}
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/* Set the output. */
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*out = task;
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return ResultSuccess();
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}
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void KInterruptEventTask::Unregister() {
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MESOSPHERE_ASSERT_THIS();
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/* Lock the task table. */
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KScopedLightLock lk(g_interrupt_event_lock);
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/* Ensure we can unregister. */
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MESOSPHERE_ABORT_UNLESS(g_interrupt_event_task_table[this->interrupt_id] == this);
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MESOSPHERE_ABORT_UNLESS(this->event != nullptr);
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this->event = nullptr;
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/* Unbind the interrupt. */
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Kernel::GetInterruptManager().UnbindHandler(this->interrupt_id, GetCurrentCoreId());
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}
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KInterruptTask *KInterruptEventTask::OnInterrupt(s32 interrupt_id) {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_UNUSED(interrupt_id);
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return this;
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}
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void KInterruptEventTask::DoTask() {
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MESOSPHERE_ASSERT_THIS();
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/* Lock the task table. */
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KScopedLightLock lk(g_interrupt_event_lock);
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if (this->event != nullptr) {
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this->event->Signal();
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}
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}
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}
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