kernel/io.c


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#include <stdint.h>
#include "io.h"

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

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

uint8_t inb(uint16_t port)
{
    uint8_t ret;
    asm volatile ("inb %1, %0" : "=a" (ret) : "dN" (port));
    return ret;
}

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