kern/include/ports/io.h

#ifndef SYSTEM_H
#define SYSTEM_H

#include <stdint.h>

// Port functions
uint8_t inb(uint16_t port) {
    uint8_t result;
    asm volatile("inb %1, %0" : "=a"(result) : "Nd"(port));
    return result;
}

void outb(uint16_t port, uint8_t data) {
    asm volatile("outb %0, %1" :: "a"(data), "Nd"(port));
}

uint16_t inw(uint16_t port) {
    uint16_t result;
    asm volatile("inw %1, %0" : "=a"(result) : "Nd"(port));
    return result;
}

void outw(uint16_t port, uint16_t data) {
    asm volatile("outw %0, %1" :: "a"(data), "Nd"(port));
}

void ioWait() {
    // Waits ~1 I/O Cycle (Linux uses this so it should be good)
    asm volatile("outb %%al, $0x80" : : "a"(0));
}

#endif