INB(9F) Kernel Functions for Drivers INB(9F)

NAME

inb, inw, inl - read from an I/O port

SYNOPSIS

#include <sys/ddi.h>
#include <sys/sunddi.h>

unsigned char inb(int port);


unsigned short inw(int port);


unsigned long inl(int port);

INTERFACE LEVEL

The functions described here are obsolete. For the inb(), inw(), and
inl() functions, use, respectively, ddi_get8(9F), ddi_get16(9F), and
ddi_get32(9F) instead.

PARAMETERS

port
A valid I/O port address.


addr
The address of a buffer where the values will be stored.


count
The number of values to be read from the I/O port.

DESCRIPTION

These routines read data of various sizes from the I/O port with the
address specified by port.


The inb(), inw(), and inl() functions read 8 bits, 16 bits, and 32
bits of data respectively, returning the resulting values.

RETURN VALUES

The inb(), inw(), and inl() functions return the value that was read
from the I/O port.

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 |
+----------------+-----------------+
|Stability Level | Obsolete |
+----------------+-----------------+

SEE ALSO

isa(5), attributes(7), ddi_get16(9F), ddi_get32(9F), ddi_get8(9F),
outb(9F)


Writing Device Drivers

September 12, 2020 INB(9F)