cpucontrol man page on FreeBSD

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

NAME
     cpucontrol — control utility for the cpuctl(4) device.

SYNOPSIS
     cpucontrol [-vh] -m msr device
     cpucontrol [-vh] -m msr=value device
     cpucontrol [-vh] -m msr&=mask device
     cpucontrol [-vh] -m msr|=mask device
     cpucontrol [-vh] -i level device
     cpucontrol [-vh] [-d datadir] -u device

DESCRIPTION
     The cpucontrol utility can be used to read and write arbitrary machine-
     specific CPU registers via the cpuctl(4) special device.  It can also be
     used to apply CPU firmware updates.

     The following options are available:

     -d datadir
	     Where to look for microcode images.  The option can be specified
	     multiple times.

     -m msr[=value]
	     Show value of the specified MSR.  MSR register number should be
	     given as a hexadecimal number.

     -m msr=value
	     Store the value in the specified MSR register.  The value argu‐
	     ment can be prefixed with ~ operator.  In this case the inverted
	     value of argument will be stored in the register.

     -m msr&=mask
	     Store the result of bitwise AND operation between mask and the
	     current MSR value in the MSR register.  The mask argument can be
	     prefixed with ~ operator.	In this case the inverted value of
	     mask will be used.

     -m msr|=mask
	     Store the result of bitwise OR operation between mask and the
	     current MSR value in the MSR register.  The mask argument can be
	     prefixed with ~ operator.	In this case the inverted value of
	     mask will be used.

     -i level
	     Retrieve CPUID info.  Level should be given as a hex number.

     -u	     Apply CPU firmware updates.  The cpucontrol utility will walk
	     through the configured data directories and apply all firmware
	     updates available for this CPU.

     -v	     Increase the verbosity level.

     -h	     Show help message.

EXIT STATUS
     The cpucontrol utility exits 0 on success, and >0 if an error occurs.

EXAMPLES
     The command

     “cpucontrol -m 0x10 /dev/cpuctl0”

     will read the contents of TSC MSR from CPU 0.

     To set the CPU 0 TSC MSR register value to 0x1 issue

     “cpucontrol -m 0x10=0x1 /dev/cpuctl0”.

     The following command will clear the second bit of TSC register:

     “cpucontrol -m 0x10&=~0x02 /dev/cpuctl0”.

     The following command will set the forth and second bit of TSC register:

     “cpucontrol -m 0x10|=0x0a /dev/cpuctl0”.

     The command

     “cpucontrol -i 0x1 /dev/cpuctl1”

     will retrieve the CPUID level 0x1 from CPU 1.

     To perform firmware updates on CPU 0 from images located at
     /usr/local/share/cpuctl/ use the following command:

     “cpucontrol -d /usr/local/share/cpuctl/ -u /dev/cpuctl0”

SEE ALSO
     cpuctl(4)

HISTORY
     The cpucontrol utility first appeared in FreeBSD 7.2.

BUGS
     Yes, probably, report if any.

AUTHORS
     The cpucontrol utility and this manual page was written by Stanislav
     Sedov ⟨stas@FreeBSD.org⟩.

BSD				 June 30, 2009				   BSD
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