xref: /freebsd/usr.sbin/cpucontrol/cpucontrol.8 (revision 2a72feb42b5cfbb556999f1e0a75ebb6ba7d78d0)

.\" Copyright (c) 2006, 2008 Stanislav Sedov <stas@FreeBSD.org>.
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.Dd August 4, 2008
.Dt CPUCONTROL 8
.Os
.Sh NAME
.Nm cpucontrol
.Nd control utility for the
.Xr cpuctl 4
device.
.Sh SYNOPSIS
.Nm
.Op Fl vh
.Fl m Ar msr Ns Op = Ns Ar value
.Bk
.Ar device
.Ek
.Nm
.Op Fl vh
.Fl i Ar level
.Bk
.Ar device
.Ek
.Nm
.Op Fl vh
.Op Fl d Ar datadir
.Fl u
.Bk
.Ar device
.Ek
.Sh DESCRIPTION
The
.Nm
utility can be used to read and write arbitrary machine-specific
CPU registers via the
.Xr cpuctl 4
special device.
It can also be used to apply CPU firmware updates.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl d Ar datadir
Where to look for microcode images.
The option can be specified multiple times.
.It Fl m Ar msr Ns Op = Ns Ar value
Read/write the specified MSR.
Both the MSR and the value should be given as a hex number.
.It Fl i Ar level
Retrieve CPUID info.
Level should be given as a hex number.
.It Fl u
Apply CPU firmware updates.
The
.Nm
utility will walk through the configured data directories
and apply all firmware updates available for this CPU.
.It Fl v
Increase the verbosity level.
.It Fl h
Show help message.
.El
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
The command
.Pp
.Dq Li "cpucontrol -m 0x10 /dev/cpuctl0"
.Pp
will read the contents of TSC MSR from CPU 0.
.Pp
To set the CPU 0 TSC MSR register value to 0x1 issue
.Pp
.Dq Li "cpucontrol -m 0x10=0x1 /dev/cpuctl0"
.Pp
The command
.Pp
.Dq Li "cpucontrol -i 0x1 /dev/cpuctl1"
.Pp
will retrieve the CPUID level 0x1 from CPU 1.
.Pp
To perform firmware updates on CPU 0 from images located at
.Pa /usr/local/share/cpuctl/
use the following command:
.Pp
.Dq Li "cpucontrol -d /usr/local/share/cpuctl/ -u /dev/cpuctl0"
.Sh SEE ALSO
.Xr cpuctl 4
.Sh HISTORY
The
.Nm
utility first appeared in
.Fx 7.2 .
.Sh BUGS
Yes, probably, report if any.
.Sh AUTHORS
The
.Nm
utility and this manual page was written by
.An Stanislav Sedov Aq stas@FreeBSD.org .