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