xref: /illumos-gate/usr/src/man/man9f/outb.9f (revision bbf21555)
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OUTB 9F "Oct 24, 2012"
NAME
outb, outw, outl - write to an I/O port
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>

void outb(int port, unsigned char value);

void outw(int port, unsigned short value);

void outl(int port, unsigned long value);
INTERFACE LEVEL
The functions described here are obsolete. For the outb(), outw(), and outl() functions use, respectively, ddi_put8(9F), ddi_put16(9F), and ddi_put32(9F) instead.
PARAMETERS
port

A valid I/O port address.

value

The data to be written to the I/O port.

addr

The address of a buffer from which the values will be fetched.

count

The number of values to be written to the I/O port.

DESCRIPTION
These routines write data of various sizes to the I/O port with the address specified by port.

The outb(), outw(), and outl() functions write 8 bits, 16 bits, and 32 bits of data respectively, writing the data specified by value.

CONTEXT
These functions may be called from user, interrupt, or kernel context.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
ATTRIBUTE TYPE ATTRIBUTE VALUE
Architecture x86
Interface Stability Obsolete
SEE ALSO
isa (5), attributes (7), ddi_put16 (9F), ddi_put32 (9F), ddi_put8 (9F), inb (9F)

Writing Device Drivers