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man/orig/cpucontrol

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

Содержание

[править] NAME

    cpucontrol -- control utility for the cpuctl(4) device.

[править] 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

[править] 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.

[править] EXIT STATUS

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

[править] 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

[править] SEE ALSO

cpuctl(4)

[править] HISTORY

    The cpucontrol utility first appeared in FreeBSD 7.2.

[править] AUTHORS

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

[править] BUGS

    Yes, probably, report if any.

FreeBSD 9.0 June 30, 2009 FreeBSD 9.0