kernel/io.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

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

void outb(uint16_t port, uint8_t val)
{
    asm volatile ("outb %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;
}