'\" te
.\" Copyright (c) 2006, Sun Microsystems, Inc.
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.TH INB 9F "September 12, 2020"
.SH NAME
inb, inw, inl \- read from an I/O port
.SH SYNOPSIS
.nf
#include <sys/ddi.h>
#include <sys/sunddi.h>

\fBunsigned char\fR \fBinb\fR(\fBint\fR \fIport\fR);
.fi

.LP
.nf
\fBunsigned short\fR \fBinw\fR(\fBint\fR
\fIport\fR);
.fi

.LP
.nf
\fBunsigned long\fR \fBinl\fR(\fBint\fR \fIport\fR);
.fi

.SH INTERFACE LEVEL
The functions described here are obsolete. For the \fBinb()\fR, \fBinw()\fR,
and \fBinl()\fR functions, use, respectively, \fBddi_get8\fR(9F),
\fBddi_get16\fR(9F), and \fBddi_get32\fR(9F) instead.
.SH PARAMETERS
.ne 2
.na
\fB\fIport\fR\fR
.ad
.RS 9n
A valid I/O port address.
.RE

.sp
.ne 2
.na
\fB\fIaddr\fR\fR
.ad
.RS 9n
The address of a buffer where the values will be stored.
.RE

.sp
.ne 2
.na
\fB\fIcount\fR\fR
.ad
.RS 9n
The number of values to be read from the I/O port.
.RE

.SH DESCRIPTION
These routines read data of various sizes from the I/O port with the address
specified by \fIport\fR.
.sp
.LP
The \fBinb()\fR, \fBinw()\fR, and \fBinl()\fR functions read 8 bits, 16 bits,
and 32 bits of data respectively, returning the resulting values.
.SH RETURN VALUES
The \fBinb()\fR, \fBinw()\fR, and \fBinl()\fR functions return the value that
was read from the I/O port.
.SH CONTEXT
These functions may be called from user, interrupt, or kernel context.
.SH ATTRIBUTES
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Architecture	x86
_
Stability Level	 Obsolete
.TE

.SH SEE ALSO
\fBisa\fR(4), \fBattributes\fR(5), \fBddi_get8\fR(9F), \fBddi_get16\fR(9F),
\fBddi_get32\fR(9F), \fBoutb\fR(9F)
.sp
.LP
\fIWriting Device Drivers\fR