BarinkOS/src/kernel/idt/idt.cpp

#include "idt.h"
#include "../pit.h"
#include "../keyboard/keyboard.h"

IDT_entry idt_table[256];
IDT_ptr idt_ptr;

void set_id_entry (uint8_t num , uint32_t base, uint16_t sel,  uint8_t flags){
    idt_table[num].offset_1 = base & 0xFFFF;
    idt_table[num].selector = sel;
    idt_table[num].zero = 0;
    idt_table[num].type_attr = flags;
    idt_table[num].offset_2 = (base >> 16) & 0xFFFF;

};

void irs_handler (registers regs) {
        kterm_writestring("received interrupt!\n");
     
        printf("(IRS) Interrupt number: %d \n", regs.int_no);

        if( regs.int_no == 13){
            printf(" Error code: %d \n", regs.err_code);

        }
        

    
  
       

}



void irq_handler (registers regs) {

    

    switch (regs.int_no) {
    case 0:
            pit_tick++;
        break;
    case 1:
        // Keyboard interrupt !!

        int scan;
        int i;/*register*/

        // Read scancode 
        scan = inb(0x60);
        
        // Send ack message!
        i = inb(0x61);
        outb(0x61, i|0x80);
        outb(0x61, i);

        // NOTE: check for special scan codes 
        // e.g. modifiers etc..
        if( scan < 0x37){
            //printf("Read from IO: 0x%x\n", scan);
            keyPress.ScanCode = scan ;
            //printf( "[From Interrupt] Scancode: %x\n", keyPress.ScanCode);

        }

        
        break;    
    case 12:
        // PS2 Mouse interrupt 
        printf("Mouse event triggered!");
        //int event = inb(0x60);
        break;

    default:
        printf("Interrupt happened!");
        printf("Received INT: 0x%x\n", regs.int_no);
        break;
    }        

    outb(0x20, 0x20); // send end of interrupt to master

    if ( regs.int_no > 8 && regs.int_no <= 15) {
        outb(0xA0, 0x20); // send end of interrupt to slave 
    }
    
    
    if( regs.int_no == 13){
        printf(" Error code: %d \n", regs.err_code);

    }

}

void init_idt(){
    // Initialise the IDT pointer
    idt_ptr.length = sizeof(IDT_entry) * 255;
    idt_ptr.base = (uint32_t)&idt_table;

    printf("Init IDT\n");
    
    // TODO: Set everything to zero first

    set_id_entry(0,  (uint32_t) irs0 , 0x08, 0x8F);
    set_id_entry(1,  (uint32_t) irs1 , 0x08, 0x8E);
    set_id_entry(2,  (uint32_t) irs2 , 0x08, 0x8E);
    set_id_entry(3,  (uint32_t) irs3 , 0x08, 0x8E);
    set_id_entry(4,  (uint32_t) irs4 , 0x08, 0x8E);
    set_id_entry(5,  (uint32_t) irs5 , 0x08, 0x8E);
    set_id_entry(6,  (uint32_t) irs6 , 0x08, 0x8E);
    set_id_entry(7,  (uint32_t) irs7 , 0x08, 0x8E);
    set_id_entry(8,  (uint32_t) irs8 , 0x08, 0x8E);
    set_id_entry(9,  (uint32_t) irs9 , 0x08, 0x8E);
    set_id_entry(10, (uint32_t) irs10 , 0x08, 0x8E);
    set_id_entry(11, (uint32_t) irs11 , 0x08, 0x8E);
    set_id_entry(12, (uint32_t) irs12 , 0x08, 0x8E);
    set_id_entry(13, (uint32_t) irs13 , 0x08, 0x8E);
    set_id_entry(14, (uint32_t) irs14 , 0x08, 0x8E);
    set_id_entry(15, (uint32_t) irs15 , 0x08, 0x8E);
    set_id_entry(16, (uint32_t) irs16 , 0x08, 0x8E);
    set_id_entry(17, (uint32_t) irs17 , 0x08, 0x8E);
    set_id_entry(18, (uint32_t) irs18 , 0x08, 0x8E);
    set_id_entry(19, (uint32_t) irs19 , 0x08, 0x8E); 
    set_id_entry(20, (uint32_t) irs20 , 0x08, 0x8E);
    set_id_entry(21, (uint32_t) irs21 , 0x08, 0x8E);
    set_id_entry(22, (uint32_t) irs22 , 0x08, 0x8E);
    set_id_entry(23, (uint32_t) irs23 , 0x08, 0x8E);
    set_id_entry(24, (uint32_t) irs24 , 0x08, 0x8E);
    set_id_entry(25, (uint32_t) irs25 , 0x08, 0x8E);
    set_id_entry(26, (uint32_t) irs26 , 0x08, 0x8E);
    set_id_entry(27, (uint32_t) irs27 , 0x08, 0x8E); 
    set_id_entry(28, (uint32_t) irs28 , 0x08, 0x8E);
    set_id_entry(29, (uint32_t) irs29 , 0x08, 0x8E);
    set_id_entry(30, (uint32_t) irs30 , 0x08, 0x8E);
    set_id_entry(31, (uint32_t) irs31 , 0x08, 0x8E);


    //print_serial("Remapping PIC\n");
    PIC_remap(0x20, 0x28);

    // clear mask for IRQ 12
    uint8_t value = inb(0x21) & ~(1<< 12);
    outb(0x21, value);



    // pic IRQ Table
    set_id_entry(32, (uint32_t)irq0, 0x08, 0x8E);
    set_id_entry(33, (uint32_t)irq1, 0x08, 0x8E); // PS2 Keyboard
    set_id_entry(34, (uint32_t)irq2, 0x08, 0x8E);
    set_id_entry(35, (uint32_t)irq3, 0x08, 0x8E);
    set_id_entry(36, (uint32_t)irq4, 0x08, 0x8E);
    set_id_entry(37, (uint32_t)irq5, 0x08, 0x8E);
    set_id_entry(38, (uint32_t)irq6, 0x08, 0x8E);
    set_id_entry(39, (uint32_t)irq7, 0x08, 0x8E);
    set_id_entry(40, (uint32_t)irq8, 0x08, 0x8E);
    set_id_entry(41, (uint32_t)irq9, 0x08, 0x8E);
    set_id_entry(42, (uint32_t)irq10, 0x08, 0x8E);
    set_id_entry(43, (uint32_t)irq11, 0x08, 0x8E);
    set_id_entry(44, (uint32_t)irq12, 0x08, 0x8E); // PS2 Mouse
    set_id_entry(45, (uint32_t)irq13, 0x08, 0x8E);
    set_id_entry(46, (uint32_t)irq14, 0x08, 0x8E);
    set_id_entry(47, (uint32_t)irq15, 0x08, 0x8E);

    
    idt_flush((uint32_t)&idt_ptr);
}