pic.h

#ifndef PIC_H
#define PIC_H
#include "kernel.h"

#define PIC1_CMD  0x20
#define PIC1_DATA 0x21
#define PIC2_CMD  0xA0
#define PIC2_DATA 0xA1

#define PIC_EOI   0x20   /* End-Of-Interrupt command */

/* Remap PIC so IRQ0–15 map to interrupts 32–47 (avoiding CPU exceptions) */
void pic_remap(void);
void pic_send_eoi(uint8_t irq);
void pic_mask_irq(uint8_t irq);
void pic_unmask_irq(uint8_t irq);

/* Low-level port I/O */
static inline void outb(uint16_t port, uint8_t val) {
    __asm__ volatile ("outb %0, %1" :: "a"(val), "Nd"(port));
}
static inline uint8_t inb(uint16_t port) {
    uint8_t val;
    __asm__ volatile ("inb %1, %0" : "=a"(val) : "Nd"(port));
    return val;
}
static inline void io_wait(void) { outb(0x80, 0); }

#endif