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-.\" Copyright (c) 1995 Paul Gortmaker
-.\" (gpg109@rsphy1.anu.edu.au)
-.\" Wed Nov 29 10:58:54 EST 1995
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH outb 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-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
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/io.h>
-.PP
-.BI "unsigned char inb(unsigned short " port );
-.BI "unsigned char inb_p(unsigned short " port );
-.BI "unsigned short inw(unsigned short " port );
-.BI "unsigned short inw_p(unsigned short " port );
-.BI "unsigned int inl(unsigned short " port );
-.BI "unsigned int inl_p(unsigned short " port );
-.PP
-.BI "void outb(unsigned char " value ", unsigned short " port );
-.BI "void outb_p(unsigned char " value ", unsigned short " port );
-.BI "void outw(unsigned short " value ", unsigned short " port );
-.BI "void outw_p(unsigned short " value ", unsigned short " port );
-.BI "void outl(unsigned int " value ", unsigned short " port );
-.BI "void outl_p(unsigned int " value ", unsigned short " port );
-.PP
-.BI "void insb(unsigned short " port ", void " addr [. count ],
-.BI "           unsigned long " count );
-.BI "void insw(unsigned short " port ", void " addr [. count ],
-.BI "           unsigned long " count );
-.BI "void insl(unsigned short " port ", void " addr [. count ],
-.BI "           unsigned long " count );
-.BI "void outsb(unsigned short " port ", const void " addr [. count ],
-.BI "           unsigned long " count );
-.BI "void outsw(unsigned short " port ", const void " addr [. count ],
-.BI "           unsigned long " count );
-.BI "void outsl(unsigned short " port ", const void " addr [. count ],
-.BI "           unsigned long " count );
-.fi
-.SH DESCRIPTION
-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.
-.PP
-They are primarily designed for internal kernel use,
-but can be used from user space.
-.\" , given the following information
-.\" in addition to that given in
-.\" .BR outb (9).
-.PP
-You must compile with \fB\-O\fP or \fB\-O2\fP or similar.
-The functions
-are defined as inline macros, and will not be substituted in without
-optimization enabled, causing unresolved references at link time.
-.PP
-You use
-.BR ioperm (2)
-or alternatively
-.BR iopl (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.
-.SH VERSIONS
-.BR outb ()
-and friends are hardware-specific.
-The
-.I value
-argument is passed first and the
-.I port
-argument is passed second,
-which is the opposite order from most DOS implementations.
-.SH STANDARDS
-None.
-.SH SEE ALSO
-.BR ioperm (2),
-.BR iopl (2)