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outsw.html
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<!-- Creator : groff version 1.22.4 -->
<!-- CreationDate: Wed Jan 29 11:26:38 2020 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="Content-Style" content="text/css">
<style type="text/css">
p { margin-top: 0; margin-bottom: 0; vertical-align: top }
pre { margin-top: 0; margin-bottom: 0; vertical-align: top }
table { margin-top: 0; margin-bottom: 0; vertical-align: top }
h1 { text-align: center }
</style>
<title>OUTB</title>
</head>
<body>
<h1 align="center">OUTB</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#CONFORMING TO">CONFORMING TO</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#COLOPHON">COLOPHON</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">outb, outw,
outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl,
outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - port I/O</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>#include
<sys/io.h></b></p>
<p style="margin-left:11%; margin-top: 1em"><b>unsigned
char inb(unsigned short int</b> <i>port</i><b>); <br>
unsigned char inb_p(unsigned short int</b> <i>port</i><b>);
<br>
unsigned short int inw(unsigned short int</b>
<i>port</i><b>); <br>
unsigned short int inw_p(unsigned short int</b>
<i>port</i><b>); <br>
unsigned int inl(unsigned short int</b> <i>port</i><b>);
<br>
unsigned int inl_p(unsigned short int</b>
<i>port</i><b>);</b></p>
<p style="margin-left:11%; margin-top: 1em"><b>void
outb(unsigned char</b> <i>value</i><b>, unsigned short
int</b> <i>port</i><b>); <br>
void outb_p(unsigned char</b> <i>value</i><b>, unsigned
short int</b> <i>port</i><b>); <br>
void outw(unsigned short int</b> <i>value</i><b>, unsigned
short int</b> <i>port</i><b>); <br>
void outw_p(unsigned short int</b> <i>value</i><b>, unsigned
short int</b> <i>port</i><b>); <br>
void outl(unsigned int</b> <i>value</i><b>, unsigned short
int</b> <i>port</i><b>); <br>
void outl_p(unsigned int</b> <i>value</i><b>, unsigned short
int</b> <i>port</i><b>);</b></p>
<p style="margin-left:11%; margin-top: 1em"><b>void
insb(unsigned short int</b> <i>port</i><b>, void
*</b><i>addr</i><b>, <br>
unsigned long int</b> <i>count</i><b>); <br>
void insw(unsigned short int</b> <i>port</i><b>, void
*</b><i>addr</i><b>, <br>
unsigned long int</b> <i>count</i><b>); <br>
void insl(unsigned short int</b> <i>port</i><b>, void
*</b><i>addr</i><b>, <br>
unsigned long int</b> <i>count</i><b>); <br>
void outsb(unsigned short int</b> <i>port</i><b>, const void
*</b><i>addr</i><b>, <br>
unsigned long int</b> <i>count</i><b>); <br>
void outsw(unsigned short int</b> <i>port</i><b>, const void
*</b><i>addr</i><b>, <br>
unsigned long int</b> <i>count</i><b>); <br>
void outsl(unsigned short int</b> <i>port</i><b>, const void
*</b><i>addr</i><b>, <br>
unsigned long int</b> <i>count</i><b>);</b></p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">This family of
functions is used to do low-level port input and output. The
out* functions do port output, the in* functions do port
input; the b-suffix functions are byte-width and the
w-suffix functions word-width; the _p-suffix functions pause
until the I/O completes.</p>
<p style="margin-left:11%; margin-top: 1em">They are
primarily designed for internal kernel use, but can be used
from user space.</p>
<p style="margin-left:11%; margin-top: 1em">You must
compile with <b>-O</b> or <b>-O2</b> or similar. The
functions are defined as inline macros, and will not be
substituted in without optimization enabled, causing
unresolved references at link time.</p>
<p style="margin-left:11%; margin-top: 1em">You use
<b>ioperm</b>(2) or alternatively <b>iopl</b>(2) to tell the
kernel to allow the user space application to access the I/O
ports in question. Failure to do this will cause the
application to receive a segmentation fault.</p>
<h2>CONFORMING TO
<a name="CONFORMING TO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>outb</b>()
and friends are hardware-specific. The <i>value</i> argument
is passed first and the <i>port</i> argument is passed
second, which is the opposite order from most DOS
implementations.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>ioperm</b>(2),
<b>iopl</b>(2)</p>
<h2>COLOPHON
<a name="COLOPHON"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">This page is
part of release 5.02 of the Linux <i>man-pages</i> project.
A description of the project, information about reporting
bugs, and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.</p>
<hr>
</body>
</html>