vulcanos/kernel/drivers/isr.c

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#include <stdint.h>
#include "isr.h"
#include "../libc/string.h"
#include "tty.h"
#include "ports.h"
#define PIC1 0x20 // I/O address for master PIC
#define PIC2 0xA0 // I/O address for slave PIC
#define PIC1_COMMAND PIC1
#define PIC1_DATA (PIC1+1)
#define PIC2_COMMAND PIC2
#define PIC2_DATA (PIC2+1)
#define PIC_EOI 0x20 // End Of Interrupt command
// List of messages for known interrupts
uint8_t *interrupts_messages[] = {
(uint8_t*)"Division by Zero", // 0
(uint8_t*)"Debug",
(uint8_t*)"Non-maskable interrupt",
(uint8_t*)"Breakpoint",
(uint8_t*)"Detected overflow",
(uint8_t*)"Out-of-bounds", // 5
(uint8_t*)"Invalid opcode",
(uint8_t*)"No coprocessor",
(uint8_t*)"Double fault",
(uint8_t*)"Coprocessor segment overrun",
(uint8_t*)"Bad TSS", // 10
(uint8_t*)"Segment not present",
(uint8_t*)"Stack fault",
(uint8_t*)"General protection fault",
(uint8_t*)"Page fault",
(uint8_t*)"Unknown interrupt", // 15
(uint8_t*)"Coprocessor fault",
(uint8_t*)"Alignment check",
(uint8_t*)"Machine check",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved",
(uint8_t*)"Reserved"
};
isr_t interrupt_handler[256];
void isr_handler(registers_t regs) {
if(interrupt_handler[regs.int_num] != 0) {
isr_t handler = interrupt_handler[regs.int_num];
handler(regs);
} else {
kprint_c((uint8_t*)"Received interrupt: ", 20, LIGHT_BROWN, BLACK);
kprint_c(interrupts_messages[(uint8_t)regs.int_num],
strlen(interrupts_messages[(uint8_t)regs.int_num]),
WHITE,
BLACK
);
kprint((uint8_t*)"\n");
}
}
void ack_irq(uint32_t int_num) {
// Send and End Of Interrupt(EOF) at the PICs.
if(int_num >= 40)
outb(PIC2_COMMAND, PIC_EOI); // Send reset signal to slave
outb(PIC2_COMMAND, PIC_EOI); // In any case, reset the master
}
void irq_handler(registers_t regs) {
ack_irq(regs.int_num);
if(interrupt_handler[regs.int_num] != 0) {
isr_t handler = interrupt_handler[regs.int_num];
handler(regs);
}
}
void register_interrupt_handler(uint8_t n, isr_t handler) {
interrupt_handler[n] = handler;
}