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


#include <myke/drivers/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_word_out(unsigned short port, unsigned short data) {
    __asm__("out %%ax, %%dx" : : "a" (data), "d" (port));
}

unsigned int port_double_word_in(unsigned int port) {
    unsigned int result;
    __asm__("in %%dx, %%eax" : "=a" (result) : "d" (port));
    return result;
}

void port_double_word_out(unsigned short port, unsigned int data) {
    __asm__("out %%eax, %%dx" : : "a" (data), "d" (port));
}

void port_word_out_repeat(unsigned short port, unsigned short *data, int buffer_size) {
    asm("rep outsw"
    : "+S"(data), "+c"(buffer_size)
    : "d"(port)
    : "memory");
}

void port_word_in_repeat(unsigned short port, unsigned short *data, int buffer_size) {
    asm("rep insw"
    : "+D"(data), "+c"(buffer_size)
    : "d"(port)
    : "memory");
}

void port_double_word_in_repeat(unsigned short port, unsigned int *data, int buffer_size) {
    asm("rep insl"
    : "+D"(data), "+c"(buffer_size)
    : "d"(port)
    : "memory");
}