io.c

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

#include "hos.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)
	);
}

unsigned char inp(unsigned short _port)
{
    unsigned char rv;
    __asm__ __volatile__ ("inb %1, %0"
	  : "=a" (rv)
	  : "d" (_port));
    return(rv);
}

unsigned short inpw (unsigned short _port)
{
    unsigned short rv;
    __asm__ __volatile__ ("inw %1, %0"
	  : "=a" (rv)
	  : "d" (_port));
    return(rv);
}

unsigned long inpd(unsigned short _port)
{
    unsigned long rv;
    __asm__ __volatile__ ("inl %1, %0"
	  : "=a" (rv)
	  : "d" (_port));
    return(rv);
}

void outp(unsigned short _port, unsigned char _data)
{
    __asm__ __volatile__ ("outb %1, %0"
	  :
	  : "d" (_port),
	    "a" (_data));
}

void outpw(unsigned short _port, unsigned short _data)
{
    __asm__ __volatile__ ("outw %1, %0"
	  :
	  : "d" (_port),
	    "a" (_data));
}

void outpd(unsigned short _port, unsigned long _data)
{
    __asm__ __volatile__ ("outl %1, %0"
	  :
	  : "d" (_port),
	    "a" (_data));
}