/*
 * ports.c
 *
 *  Created on: Aug 18, 2019
 *      Author: rick
 */


#include "ports.h"

/**
 * Read a byte from the specified port
 */
unsigned char port_byte_in(unsigned short port) {
    unsigned char result;
    __asm__("in %%dx, %%al" : "=a" (result) : "d" (port));
    return result;
}


void port_byte_out(unsigned short port, unsigned char data) {
    __asm__("out %%al, %%dx" : : "a" (data), "d" (port));
}

unsigned short port_word_in(unsigned short port) {
    unsigned short result;
    __asm__("in %%dx, %%ax" : "=a" (result) : "d" (port));
    return result;
}

void port_wordt_out(unsigned short port, unsigned short data) {
    __asm__("out %%ax, %%dx" : : "a" (data), "d" (port));
}