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CPUCTL(8)                   System Manager's Manual                  CPUCTL(8)

NAME
     cpuctl -- program to control CPUs

SYNOPSIS
     cpuctl command [arguments]

DESCRIPTION
     The cpuctl command can be used to control and inspect the state of CPUs
     in the system.

     The first argument, command, specifies the action to take.  Valid
     commands are:

     identify cpu     Output information on the specified CPU's features and
                      capabilities.  Not available on all architectures.

     list             For each CPU in the system, display the current state
                      and time of the last state change.

     offline cpuno    Set the specified CPU off line.

                      Unbound LWPs (lightweight processes) will not be
                      executed on the CPU while it is off line.  Bound LWPs
                      will continue to be executed on the CPU, and device
                      interrupts routed to the CPU will continue to be
                      handled.  A future release of the system may allow
                      device interrupts to be re-routed away from individual
                      CPUs.

                      At least one CPU in the system must remain on line.

     online cpuno     Set the specified CPU on line, making it available to
                      run unbound LWPs.

     ucode [file]     This applies the microcode patch on all CPUs.  The
                      default filename is used if no filename is specified.
                      The identify command prints the installed version on
                      that CPU.  On success the identify command show
                      different ucode versions before and after this command.

FILES
     /dev/cpuctl  control device
     /libdata/firmware/x86/amd/
                  The directory to install the microcode file for AMD CPUs
                  into.  The default filename is microcode_amd.bin for CPU
                  families 0x10 to 0x14.  The default filename is
                  microcode_amd_famXXh.bin where XX is the CPU family starting
                  with 15 (hex).  Get it from
                  http://www.amd64.org/support/microcode.html

EXAMPLES
     Run
           cpuctl identify 0
     and you should see something like this:

           cpu0: UCode version: 0x1000080

     After applying the microcode patch with
           cpuctl ucode
     you can see with
           cpuctl identify 0
     that the patch got applied:

           cpu0: UCode version: 0x1000083

SEE ALSO
     psrset(8), schedctl(8)

HISTORY
     The cpuctl command first appeared in NetBSD 5.0.

NetBSD 6.1.5                   January 13, 2012                   NetBSD 6.1.5