$NetBSD: i386_iopl.2,v 1.17 2008/04/30 13:10:50 martin Exp $
Copyright (c) 1996 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by John T. Kohl and Charles M. Hannum.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd April 12, 2004 .Dt I386_IOPL 2 i386 .Os .Sh NAME .Nm i386_iopl .Nd change the i386 I/O privilege level .Sh LIBRARY .Lb libi386 .Sh SYNOPSIS n sys/types.h n machine/sysarch.h .Ft int .Fn i386_iopl "int iopl" .Sh DESCRIPTION .Fn i386_iopl sets the i386 I/O privilege level to the value specified by .Ar iopl . This call is restricted to the super-user. .Sh RETURN VALUES Upon successful completion, .Fn i386_iopl returns 0. Otherwise, a value of -1 is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS .Fn i386_iopl will fail if: l -tag -width [EINVAL] t Bq Er EPERM The caller was not the super-user, or the operation was not permitted at the current security level. .El .Sh REFERENCES i386 Microprocessor Programmer's Reference Manual, Intel .Sh WARNING You can really hose your machine if you enable user-level I/O and write to hardware ports without care.
Copyright (c) 1996 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by John T. Kohl and Charles M. Hannum.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd April 12, 2004 .Dt I386_IOPL 2 i386 .Os .Sh NAME .Nm i386_iopl .Nd change the i386 I/O privilege level .Sh LIBRARY .Lb libi386 .Sh SYNOPSIS n sys/types.h n machine/sysarch.h .Ft int .Fn i386_iopl "int iopl" .Sh DESCRIPTION .Fn i386_iopl sets the i386 I/O privilege level to the value specified by .Ar iopl . This call is restricted to the super-user. .Sh RETURN VALUES Upon successful completion, .Fn i386_iopl returns 0. Otherwise, a value of -1 is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS .Fn i386_iopl will fail if: l -tag -width [EINVAL] t Bq Er EPERM The caller was not the super-user, or the operation was not permitted at the current security level. .El .Sh REFERENCES i386 Microprocessor Programmer's Reference Manual, Intel .Sh WARNING You can really hose your machine if you enable user-level I/O and write to hardware ports without care.
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