2002-10-01 20:02:41 +04:00
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.\" $NetBSD: x86_64_iopl.2,v 1.3 2002/10/01 16:02:43 wiz Exp $
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.\"
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.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by John T. Kohl and Charles M. Hannum.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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2002-07-04 16:24:40 +04:00
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.Dd July 3, 2002
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.Dt X86_64_IOPL 2 x86_64
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.Os
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.Sh NAME
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.Nm x86_64_iopl
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.Nd change the x86_64 I/O privilege level
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.Sh LIBRARY
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.Lb libx86_64
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.Sh SYNOPSIS
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.Fd #include \*[Lt]sys/types.h\*[Gt]
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.Fd #include \*[Lt]machine/sysarch.h\*[Gt]
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.Ft int
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.Fn x86_64_iopl "int iopl"
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.Sh DESCRIPTION
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.Fn x86_64_iopl
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sets the x86_64 I/O privilege level to the value specified by
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.Ar iopl .
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This call is restricted to the super-user.
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn x86_64_iopl
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returns 0.
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Otherwise, a value of \-1 is returned and the global
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variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn x86_64_iopl
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will fail if:
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.Bl -tag -width [EINVAL]
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.It Bq Er EPERM
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The caller was not the super-user, or the operation was not permitted at the
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current security level.
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.El
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.Sh WARNING
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You can really hose your machine if you enable user-level I/O and
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write to hardware ports without care.
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