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NetBSD 6.1.5 - man page for cpuctl (netbsd section 8)

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

     cpuctl -- program to control CPUs

     cpuctl command [arguments]

     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.

     /dev/cpuctl  control device
		  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 file-
		  name 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

	   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

     psrset(8), schedctl(8)

     The cpuctl command first appeared in NetBSD 5.0.

BSD					 January 13, 2012				      BSD

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