io.c

来自「用于汇编领域的,运用于OS的MAIN函数.基于硬件基础的源代码」· C语言 代码 · 共 33 行

#include "io.h"

void outbyte(unsigned short port, unsigned char value)
{
	__asm__ __volatile__ (
		"outb	%b0, %w1"
		:
		: "a" (value), "Nd" (port)
	);
}

unsigned char inbyte(unsigned short port)
{
	unsigned char value;

	__asm__ __volatile__ (
		"inb	%w1, %b0"
		: "=a" (value)
		: "Nd" (port)
	);
}

void iodelay(void)
{
	unsigned char value = 0;

	__asm__ __volatile__ (
		"outb %0, $0x80"
		:
		: "a" (value)
	);
}