IOPort Class Reference

Abstracts access to the I/O address space. More...

#include <machine/ioport.h>

Public Member Functions
	IOPort (uint16_t addr)
	Constructor.
void	outb (uint8_t val) const
	Write one byte to the I/O port.
void	outw (uint16_t val) const
	Write one word (2 bytes) to the I/O port.
uint8_t	inb () const
	Read one byte from the I/O port.
uint16_t	inw () const
	Read one word (2 bytes) from the I/O port.

Private Attributes
uint16_t	address
	Address in I/O address space.

Detailed Description

Abstracts access to the I/O address space.

x86 PCs have a separated I/O address space that is accessible only via the machine instructions in and out. An IOPort object encapsulates the corresponding address in the I/O address space and can be used for byte or word-wise reading or writing.

Constructor & Destructor Documentation

IOPort()

IOPort::IOPort ( uint16_t  addr )

inlineexplicit

Constructor.

Parameters

addr	Address from the I/O address space

Member Function Documentation

outb()

void IOPort::outb ( uint8_t  val ) const

inline

Write one byte to the I/O port.

Parameters

val	The value to be written

outw()

void IOPort::outw ( uint16_t  val ) const

inline

Write one word (2 bytes) to the I/O port.

Parameters

val	The value to be written

inb()

uint8_t IOPort::inb ( ) const

inline

Read one byte from the I/O port.

Returns

Read byte

inw()

uint16_t IOPort::inw ( ) const

inline

Read one word (2 bytes) from the I/O port.

Returns

Read word (2 bytes)

Member Data Documentation

address

uint16_t IOPort::address

private

Address in I/O address space.

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The documentation for this class was generated from the following file:

• machine/ioport.h