mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/*
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* Copyright (c) 2018 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 <stdint.h>
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#include <stdbool.h>
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#include "utils.h"
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#include "interrupt.h"
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/* Global of registered handlers. */
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static struct {
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unsigned int id;
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void (*handler)(void);
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} g_registered_interrupts[MAX_REGISTERED_INTERRUPTS] = { {0} };
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static unsigned int get_interrupt_id(void) {
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return GICC_IAR;
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}
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/* Initializes the GIC. This must be called during wakeup. */
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void intr_initialize_gic(void) {
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/* Setup interrupts 0-0x1F as nonsecure with highest non-secure priority. */
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GICD_IGROUPR[0] = 0xFFFFFFFF;
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for (unsigned int i = 0; i < 0x20; i++) {
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GICD_IPRIORITYR[i] = GIC_PRI_HIGHEST_NONSECURE;
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}
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/* Setup the GICC. */
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GICC_CTLR = 0x1D9;
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GICC_PMR = GIC_PRI_HIGHEST_NONSECURE;
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GICC_BPR = 7;
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}
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/* Initializes Interrupt Groups 1-7 in the GIC. Called by pk2ldr. */
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void intr_initialize_gic_nonsecure(void) {
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for (unsigned int i = 1; i < 8; i++) {
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GICD_IGROUPR[i] = 0xFFFFFFFF;
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}
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for (unsigned int i = 0x20; i < 0xE0; i++) {
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GICD_IPRIORITYR[i] = GIC_PRI_HIGHEST_NONSECURE;
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}
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GICD_CTLR = 1;
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}
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/* Sets GICC_CTLR to appropriate pre-sleep value. */
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void intr_prepare_gicc_for_sleep(void) {
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GICC_CTLR = 0x1E0;
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}
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/* Sets an interrupt's group in the GICD. */
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void intr_set_group(unsigned int id, int group) {
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GICD_IGROUPR[id >> 5] = (GICD_IGROUPR[id >> 5] & (~(1 << (id & 0x1F)))) | ((group & 1) << (id & 0x1F));
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}
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/* Sets an interrupt id as pending in the GICD. */
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void intr_set_pending(unsigned int id) {
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GICD_ISPENDR[id >> 5] = 1 << (id & 0x1F);
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}
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/* Sets an interrupt's priority in the GICD. */
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void intr_set_priority(unsigned int id, uint8_t priority) {
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GICD_IPRIORITYR[id] = priority;
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}
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/* Sets an interrupt's target CPU mask in the GICD. */
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void intr_set_cpu_mask(unsigned int id, uint8_t mask) {
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GICD_ITARGETSR[id] = mask;
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}
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/* Sets an interrupt's edge/level bits in the GICD. */
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void intr_set_edge_level(unsigned int id, int edge_level) {
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GICD_ICFGR[id >> 4] = GICD_ICFGR[id >> 4] & ((~(3 << ((id & 0xF) << 1))) | (((edge_level & 1) << 1) << ((id & 0xF) << 1)));
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}
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/* Sets an interrupt's enabled status in the GICD. */
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void intr_set_enabled(unsigned int id, int enabled) {
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GICD_ISENABLER[id >> 5] = (enabled & 1) << (id & 0x1F);
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}
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/* To be called by FIQ handler. */
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void handle_registered_interrupt(void) {
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unsigned int interrupt_id = get_interrupt_id();
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if (interrupt_id <= 0xDF) {
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bool found_handler = false;
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for (unsigned int i = 0; i < MAX_REGISTERED_INTERRUPTS; i++) {
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if (g_registered_interrupts[i].id == interrupt_id) {
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found_handler = true;
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g_registered_interrupts[i].handler();
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/* Mark that interrupt is done. */
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GICC_EOIR = interrupt_id;
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break;
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}
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}
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/* We must have found a handler, or something went wrong. */
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if (!found_handler) {
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generic_panic();
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}
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}
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}
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/* Registers an interrupt into the global. */
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void intr_register_handler(unsigned int id, void (*handler)(void)) {
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bool registered_handler = false;
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for (unsigned int i = 0; i < MAX_REGISTERED_INTERRUPTS; i++) {
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if (g_registered_interrupts[i].id == 0) {
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g_registered_interrupts[i].handler = handler;
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g_registered_interrupts[i].id = id;
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registered_handler = true;
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break;
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}
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}
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/* Failure to register is an error condition. */
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if (!registered_handler) {
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generic_panic();
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}
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}
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