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CPUCTL(8)		  BSD 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 com‐
     mands 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 exe‐
		      cuted on the CPU while it is off line.  Bound LWPs will
		      continue to be executed on the CPU, and device inter‐
		      rupts 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 differ‐
		      ent 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.

BSD			       January 13, 2012				   BSD

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