Atmosphere/exosphere/program/source/secmon_interrupt_handler.cpp

70 lines
2.3 KiB
C++

/*
* 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 <exosphere.hpp>
#include "secmon_interrupt_handler.hpp"
#include "secmon_error.hpp"
namespace ams::secmon {
namespace {
constexpr inline int InterruptHandlersMax = 4;
constinit InterruptHandler g_handlers[InterruptHandlersMax] = {};
constinit int g_interrupt_ids[InterruptHandlersMax] = {};
constinit u8 g_interrupt_core_masks[InterruptHandlersMax] = {};
}
void SetInterruptHandler(int interrupt_id, u8 core_mask, InterruptHandler handler) {
for (int i = 0; i < InterruptHandlersMax; ++i) {
if (g_interrupt_ids[i] == 0) {
g_interrupt_ids[i] = interrupt_id;
g_handlers[i] = handler;
g_interrupt_core_masks[i] = core_mask;
return;
}
}
AMS_ABORT("Failed to register interrupt handler");
}
void HandleInterrupt() {
/* Get the interrupt id. */
const int interrupt_id = gic::GetInterruptRequestId();
if (interrupt_id >= gic::InterruptCount) {
/* Invalid interrupt number, just return. */
return;
}
/* Check each handler. */
for (int i = 0; i < InterruptHandlersMax; ++i) {
if (g_interrupt_ids[i] == interrupt_id) {
/* Validate that we can invoke the handler. */
AMS_ABORT_UNLESS((g_interrupt_core_masks[i] & (1u << hw::GetCurrentCoreId())) != 0);
/* Invoke the handler. */
g_handlers[i]();
gic::SetEndOfInterrupt(interrupt_id);
return;
}
}
AMS_ABORT("Failed to find interrupt handler.");
}
}