Atmosphere/libraries/libmesosphere/source/kern_k_interrupt_event.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>
namespace ams::kern {
namespace {
constinit KLightLock g_interrupt_event_lock;
constinit KInterruptEventTask *g_interrupt_event_task_table[KInterruptController::NumInterrupts] = {};
}
Result KInterruptEvent::Initialize(int32_t interrupt_name, ams::svc::InterruptType type) {
MESOSPHERE_ASSERT_THIS();
/* Verify the interrupt is defined and global. */
R_UNLESS(Kernel::GetInterruptManager().IsInterruptDefined(interrupt_name), svc::ResultOutOfRange());
R_UNLESS(Kernel::GetInterruptManager().IsGlobal(interrupt_name), svc::ResultOutOfRange());
/* Set interrupt id. */
m_interrupt_id = interrupt_name;
/* Set core id. */
m_core_id = GetCurrentCoreId();
/* Initialize readable event base. */
KReadableEvent::Initialize(nullptr);
/* Try to register the task. */
R_TRY(KInterruptEventTask::Register(m_interrupt_id, m_core_id, type == ams::svc::InterruptType_Level, this));
/* Mark initialized. */
m_is_initialized = true;
return ResultSuccess();
}
void KInterruptEvent::Finalize() {
MESOSPHERE_ASSERT_THIS();
g_interrupt_event_task_table[m_interrupt_id]->Unregister(m_interrupt_id, m_core_id);
/* Perform inherited finalization. */
KAutoObjectWithSlabHeapAndContainer<KInterruptEvent, KReadableEvent>::Finalize();
}
Result KInterruptEvent::Reset() {
MESOSPHERE_ASSERT_THIS();
/* Lock the task. */
KScopedLightLock lk(g_interrupt_event_task_table[m_interrupt_id]->GetLock());
/* Clear the event. */
R_TRY(KReadableEvent::Reset());
/* Clear the interrupt. */
Kernel::GetInterruptManager().ClearInterrupt(m_interrupt_id, m_core_id);
return ResultSuccess();
}
Result KInterruptEventTask::Register(s32 interrupt_id, s32 core_id, bool level, KInterruptEvent *event) {
/* Lock the task table. */
KScopedLightLock lk(g_interrupt_event_lock);
/* Get a task for the id. */
bool allocated = false;
KInterruptEventTask *task = g_interrupt_event_task_table[interrupt_id];
if (task != nullptr) {
/* Check that there's not already an event for this task. */
R_UNLESS(task->m_event == nullptr, svc::ResultBusy());
} else {
/* Allocate a new task. */
task = KInterruptEventTask::Allocate();
R_UNLESS(task != nullptr, svc::ResultOutOfResource());
allocated = true;
}
/* Ensure that the task is cleaned up if anything goes wrong. */
auto task_guard = SCOPE_GUARD { if (allocated) { KInterruptEventTask::Free(task); } };
/* Register/bind the interrupt task. */
{
/* Acqquire exclusive access to the task. */
KScopedLightLock tlk(task->m_lock);
/* Bind the interrupt handler. */
R_TRY(Kernel::GetInterruptManager().BindHandler(task, interrupt_id, core_id, KInterruptController::PriorityLevel_High, true, level));
/* Set the event. */
task->m_event = event;
}
/* If we allocated, set the event in the table. */
if (allocated) {
g_interrupt_event_task_table[interrupt_id] = task;
}
/* We successfully registered, so we don't need to free the task. */
task_guard.Cancel();
return ResultSuccess();
}
void KInterruptEventTask::Unregister(s32 interrupt_id, s32 core_id) {
MESOSPHERE_ASSERT_THIS();
/* Lock the task table. */
KScopedLightLock lk(g_interrupt_event_lock);
/* Lock the task. */
KScopedLightLock tlk(m_lock);
/* Ensure we can unregister. */
MESOSPHERE_ABORT_UNLESS(g_interrupt_event_task_table[interrupt_id] == this);
MESOSPHERE_ABORT_UNLESS(m_event != nullptr);
/* Unbind the interrupt. */
m_event = nullptr;
Kernel::GetInterruptManager().UnbindHandler(interrupt_id, core_id);
}
KInterruptTask *KInterruptEventTask::OnInterrupt(s32 interrupt_id) {
MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_UNUSED(interrupt_id);
return this;
}
void KInterruptEventTask::DoTask() {
MESOSPHERE_ASSERT_THIS();
/* Lock the task table. */
KScopedLightLock lk(m_lock);
if (m_event != nullptr) {
m_event->Signal();
}
}
}