port_io.h File Reference

c wrappers for asm port operations More...

#include "stdint.h"

Go to the source code of this file.

Functions
static uint8_t	inb (uint16_t port)
	read byte from low level port
static void	outb (uint16_t port, uint8_t val)
	write byte to low level port
static uint16_t	inw (uint16_t port)
	read word from low level port
static void	outw (uint16_t port, uint16_t val)
	write word to low level port
static uint32_t	inl (uint16_t port)
	read double word from low level port
static void	outl (uint16_t port, uint32_t val)
	write double word to low level port
static void	io_wait (void)
	perform a short wait (1-4 microseconds)

Detailed Description

c wrappers for asm port operations

Function Documentation

inb()

static uint8_t inb ( uint16_t  port )

inlinestatic

read byte from low level port

Parameters

port	port to read from

Returns

value in port

inl()

static uint32_t inl ( uint16_t  port )

inlinestatic

read double word from low level port

Parameters

port	port to read from

Returns

value in port

inw()

static uint16_t inw ( uint16_t  port )

inlinestatic

read word from low level port

Parameters

port	port to read from

Returns

value in port

io_wait()

static void io_wait ( void  )

inlinestatic

perform a short wait (1-4 microseconds)

This function outputs to a random unused port (0x80 is almost always unused after booting) Since output takes some time, this function can work as a small wait

outb()

static void outb ( uint16_t  port, uint8_t  val  )

inlinestatic

write byte to low level port

Parameters

port	port to write to
val	value to write to port

outl()

static void outl ( uint16_t  port, uint32_t  val  )

inlinestatic

write double word to low level port

Parameters

port	port to write to
val	value to write to port

outw()

static void outw ( uint16_t  port, uint16_t  val  )

inlinestatic

write word to low level port

Parameters

port	port to write to
val	value to write to port