xf86 becomes a MI manpage

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-.\"	$OpenBSD: xf86.4,v 1.16 2001/10/05 14:45:54 mpech Exp $
-.\"
-.\" Copyright (c) 1998 Matthieu Herrb
-.\" All rights reserved.
-.\"
-.\" 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.
-.\" 3. The name of the author may not be used to endorse or promote products
-.\"    derived from this software without specific prior written permission
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 February 20, 1998
-.Dt XF86 4 i386
-.Os
-.Sh NAME
-.Nm xf86
-.Nd XFree86 aperture driver
-.Sh SYNOPSIS
-.Cd "option APERTURE"
-.Sh DESCRIPTION
-The
-.Pa /dev/xf86
-driver provides access to the memory and I/O ports of a VGA board for
-use by the XFree86 X servers
-when running with a kernel security level > 0.
-.Pp
-The X servers require the use of this driver.
-.Sh ACCESS CONTROL
-Access to the
-.Pa /dev/xf86
-device is allowed when the sysctl variable
-.Va machdep.allowaperture
->= 1.
-This variable (which default value is 0)
-can only be manipulated when the security level is <= 0, so it should be
-set in
-.Pa /etc/sysctl.conf .
-The possible values for 
-.Va machdep.allowaperture 
-are:
-.Bl -tag -width Ds
-.It 0
-the aperture driver is disabled.
-Opening it returns
-.Dv EPERM. 
-.It 1
-the aperture driver allows access to standard VGA framebuffer and
-BIOS.
-.It 2
-the aperture driver allows access to the whole 1st megabyte of physical
-memory, permitting use of the int10 emulation in XFree86 4.0.x.
-Note that this can cause some security problems, since the process that
-has access to the aperture driver can also access part of the kernel
-memory. 
-.El
-.Sh SEE ALSO
-.Xr XF86_Accel 1 ,
-.Xr XF86_SVGA 1 ,
-.Xr options 4 ,
-.Xr sysctl.conf 5 ,
-.Xr config 8 ,
-.Xr sysctl 8
-.Sh HISTORY
-.Pa /dev/xf86
-was introduced as a loadable kernel module for
-.Nx 0.9 c
-with XFree86 3.1.
-It was integrated as an in-kernel device on
-.Ox 2.3 .
-It is required in order to allow access to I/O ports for all X servers since
-.Ox 2.4 .
-.Sh AUTHORS
-The aperture driver was written by Matthieu Herrb.
-.Sh BUGS
-This driver allows access to all addresses above
-.Va physmem .
-It should be restricted to the actual address range of the video
-memory.