RockOS/kernel/interrupts.c

#include "lib/print.h"
#include <stdint.h>

extern void send_eoi_master(void);
extern void send_eoi_slave(void);
extern uint8_t read_isr_master(void);
extern uint8_t read_isr_slave(void);

extern uint8_t ps2_read_data();

struct registers {
    uint32_t edi, esi, ebp, esp_dummy, ebx, edx, ecx, eax;
    
    uint32_t int_no;    
    uint32_t error_code;
    
    uint32_t eip, cs, eflags, useresp, ss;
};

const char* err_messages[32] = {
    [0] = "Divide by 0",
    [1] = "",
    [8] = "",
    [13] = "General Protection Fault",
    [14] = "Page Fault",
};

void common_interrupt_handler(struct registers *args) {
    switch (args->int_no) {
        case 0:
        case 1:
        case 2:
        case 3:
        case 4:
        case 5:
        case 6:
        case 7:
        case 8:
        case 9:
        case 10:
        case 11:
        case 12:
        case 13:
        case 15:
        case 16:
            kprintf("CPU Error: %s", err_messages[args->int_no]);
            break;
        case 14:{
            uint32_t faulting_address;
            asm volatile("mov %%cr2, %0" : "=r"(faulting_address));
            kprintf("\n--- PAGE FAULT ---\n");
            kprintf("Faulted Virtual Address: 0x%x\n", faulting_address);
            kprintf("Error Code: 0x%x\n", args->error_code);
            kprintf("Instruction Pointer: 0x%x\n", args->eip);
            kprintf("Caused by: %s, %s, running in %s mode\n",
                (args->error_code & 0x01) ? "Protection Violation" : "Page Not Present",
                (args->error_code & 0x02) ? "Write" : "Read",
                (args->error_code & 0x04) ? "User" : "Supervisor");
            while(1);
            break;
        }
        case 32:
            // wake the PIT timer driver
            send_eoi_master();
            break;
        case 33: {
            uint8_t data = ps2_read_data();
            send_eoi_master();
            break;
        }
        default:
            kprintf("Received unhandled interrupt: %d\n", args->int_no);
            return;
    }
}