mount_kernfs —
mount the /kern file system
  
    | mount_kernfs | [ -ooptions]
      /kern mount_point | 
The mount_kernfs command attaches an instance of the
  kernel parameter namespace to the global filesystem namespace. The
  conventional mount point is /kern. The directory
  specified by mount_point is converted to an absolute
  path before use. This command is normally executed by
  mount(8) at boot time.
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.
The options are as follows:
  - -o
- Options are specified with a -oflag followed by a
      comma separated string of options. See the
      mount(8) man page for
      possible options and their meanings.
  - boottime
- the time at which the system was last booted (decimal ASCII).
- copyright
- kernel copyright message.
- 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.
- hz
- the frequency of the system clock (decimal ASCII).
- 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.
- msgbuf
- the kernel message buffer, also read by
      syslogd(8), through the
      log device, and by
      dmesg(8).
- pagesize
- the machine pagesize (decimal ASCII).
- physmem
- the number of pages of physical memory in the machine (decimal
    ASCII).
- rootdev
- the root device.
- rrootdev
- the raw root device.
- time
- the second and microsecond value of the system clock. Both numbers are in
      decimal ASCII.
- version
- the kernel version string. The head line for
      /etc/motd can be generated by running:
      “sed 1q /kern/version”
Themount_kernfs utility first appeared in
  4.4BSD.
This filesystem may not be NFS-exported.