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)
