BarinkOS/src/kernel/arch/i386/idt/idt.cpp

#include "idt.h"
//#include "scancodes/set1.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) {
        
     
        if ( regs.int_no != 0) {
            kterm_writestring("received interrupt!\n");
            printf("(IRQ) Interrupt number: %d \n", regs.int_no);
        
        }
        
        if ( regs.int_no == 1 ){
            // Keyboard interrupt !!

            int scan;
            register int i;

            // Read scancode 

            scan = inb(0x60);
            
            // Send ack message!
            i = inb(0x61);
            outb(0x61, i|0x80);
            outb(0x61, i);
            kterm_writestring("A key was pressed/released\n");
            printf( "Scancode: %x\n", scan);

    
        }

        
        
        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;


    // 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);


    // pic IRQ Table
    set_id_entry(32, (uint32_t)irq0, 0x08, 0x8E);
    set_id_entry(33, (uint32_t)irq1, 0x08, 0x8E);
    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);
    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);
}