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https://github.com/Atmosphere-NX/Atmosphere.git
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99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
#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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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, NULL}, {0, NULL}, {0, NULL}, {0, NULL} };
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/* Prototypes for internal (private) functions. */
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unsigned int get_interrupt_id(void);
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/* Initializes the GIC. TODO: 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;
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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;
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GICC_BPR = 7;
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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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