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Man Pages


Manual Reference Pages  -  CPUCONTROL (8)

NAME

cpucontrol - control utility for the cpuctl(4) device

CONTENTS

Synopsis
Description
Exit Status
Examples
See Also
History
Authors
Bugs

SYNOPSIS

cpucontrol [-vh] -m msr
.Bk device
.Ek cpucontrol [-vh] -m msr = value
.Bk device
.Ek cpucontrol [-vh] -m msr &= mask
.Bk device
.Ek cpucontrol [-vh] -m msr |= mask
.Bk device
.Ek cpucontrol [-vh] -i level
.Bk device
.Ek cpucontrol [-vh] -i level,level_type
.Bk device
.Ek cpucontrol [-vh] [-d datadir] -u
.Bk device
.Ek

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 argument 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.
-i level,level_type
  Retrieve CPUID info. Level and level_type should be given as hex numbers.
-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


.Ex -std

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
.Fx 7.2 .

AUTHORS

The cpucontrol utility and this manual page was written by
.An Stanislav Sedov Aq stas@FreeBSD.org .

BUGS

Yes, probably, report if any.
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