#ifndef PIC_H
#define PIC_H

#include "hos_types.h"
#include "portio.h"

#define PIC1            0x20
#define PIC2            0xA0
#define PIC1_COMMAND    PIC1
#define PIC1_DATA       (PIC1+1)
#define PIC2_COMMAND    PIC2
#define PIC2_DATA       (PIC2+1)
#define PIC_EOI         0x20

#define ICW1_ICW4       0x01            /* ICW4 (not) needed */
#define ICW1_SINGLE     0x02            /* Single (cascade) mode */
#define ICW1_INTERVAL4  0x04            /* Call address interval 4 (8) */
#define ICW1_LEVEL      0x08            /* Level triggered (edge) mode */
#define ICW1_INIT       0x10            /* Initialization - required! */

#define ICW4_8086       0x01            /* 8086/88 (MCS-80/85) mode */
#define ICW4_AUTO       0x02            /* Auto (normal) EOI */
#define ICW4_BUF_SLAVE  0x08            /* Buffered mode/slave */
#define ICW4_BUF_MASTER 0x0C            /* Buffered mode/master */
#define ICW4_SFNM       0x10            /* Special fully nested (not) */

void pic_remap(u8_t base1, u8_t base2);

/* Masks interrupts on first Programmable Interrupt Controller */
#define pic_mask1(mask) outportb(PIC1_DATA, mask) /* 0x21, maskfield *OCW1* */

/* Masks interrupts on second Programmable Interrupt Controller */
#define pic_mask2(mask) outportb(PIC2_DATA, mask) /* 0xA1, maskfield *OCW1* */

/* Signals an End Of Interrupt signal to the first PIC */
#define pic_eoi() outportb(0x20, 0x20)

/* Signals an End Of Interrupt signal to both the second and first PIC unit */
static inline void pic_eoi2()
{
        outportb(0xA0, 0x20);
        outportb(0x20, 0x20);
}

#endif