k-tana-zero/k/pic/pic.c

#include "pic.h"
#include "io.h"

void remap_pic(void)
{
    // ICW1
    outb(MASTER_PORT_A, ICW1_INIT | ICW1_ICW4);
    outb(SLAVE_PORT_A, ICW1_INIT | ICW1_ICW4);

    // ICW2
    outb(MASTER_PORT_B, ICW2_M_OFFSET);
    outb(SLAVE_PORT_B, ICW2_S_OFFSET);

    // ICW3
    outb(MASTER_PORT_B, PIC_PIN_2);
    outb(SLAVE_PORT_B, 2);

    // ICW4
    outb(MASTER_PORT_B, ICW4_INIT);
    outb(SLAVE_PORT_B, ICW4_INIT);

    // OCW1
    outb(MASTER_PORT_B, PIC_PIN_3 | PIC_PIN_4 | PIC_PIN_5 |
                        PIC_PIN_6 | PIC_PIN_7);
    outb(SLAVE_PORT_B, PIC_PIN_0 | PIC_PIN_1 | PIC_PIN_2 | PIC_PIN_3 |
                       PIC_PIN_4 | PIC_PIN_5);

    asm volatile("sti");
}