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+.\"
+.\" Copyright (c) 1992, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software donated to Berkeley by
+.\" Jan-Simon Pendry.
+.\"
+.\" 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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"	@(#)mount_kernfs.8	8.2 (Berkeley) 3/27/94
+.\"
+.\"
+.Dd March 27, 1994
+.Dt MOUNT_KERNFS 8
+.Os BSD 4.4
+.Sh NAME
+.Nm mount_kernfs
+.Nd mount the /kern file system
+.Sh SYNOPSIS
+.Nm mount_kernfs
+.Op Fl o Ar options
+.Ar /kern
+.Ar mount_point
+.Sh DESCRIPTION
+The
+.Nm mount_kern
+command attaches an instance of the kernel parameter
+namespace to the global filesystem namespace.
+The conventional mount point is
+.Pa /kern .
+This command is normally executed by
+.Xr mount 8
+at boot time.
+.Pp
+The filesystem includes several regular files which can be read,
+some of which can also be written.
+The contents of the files is in a machine-independent format,
+either a string, or an integer in decimal ASCII.
+Where numbers are returned, a trailing newline character is also added.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl o
+Options are specified with a
+.Fl o
+flag followed by a comma separated string of options.
+See the
+.Xr mount 8
+man page for possible options and their meanings.
+.El
+.Sh FILES
+.Bl -tag -width copyright -compact
+.It Pa boottime
+the time at which the system was last booted (decimal ASCII).
+.It Pa copyright
+kernel copyright message.
+.It Pa hostname
+the hostname, with a trailing newline.
+The hostname can be changed by writing to this file.
+A trailing newline will be stripped from the hostname being written.
+.It Pa hz
+the frequency of the system clock (decimal ASCII).
+.It Pa loadavg
+the 1, 5 and 15 minute load average in kernel fixed-point format.
+The final integer is the fix-point scaling factor.
+All numbers are in decimal ASCII.
+.It Pa pagesize
+the machine pagesize (decimal ASCII).
+.It Pa physmem
+the number of pages of physical memory in the machine (decimal ASCII).
+.It Pa root
+the system root directory.
+In a chroot'ed environment,
+.Nm
+can be used to create a new
+.Pa /kern
+mount point.
+.Pa /kern/root
+will then refer to the system global root, not the current process root.
+.It Pa rootdev
+the root device.
+.It Pa rrootdev
+the raw root device.
+.It Pa time
+the second and microsecond value of the system clock.
+Both numbers are in decimal ASCII.
+.It Pa version
+the kernel version string.
+The head line for
+.Pa /etc/motd
+can be generated by running:
+.Dq Ic "sed 1q /kern/version"
+.El
+.Sh SEE ALSO
+.Xr mount 2 ,
+.Xr unmount 2 ,
+.Xr fstab 5 ,
+.Xr mount 8
+.Sh CAVEATS
+This filesystem may not be NFS-exported.
+.Sh HISTORY
+The
+.Nm mount_kernfs
+utility first appeared in 4.4BSD.