1.\" Copyright (c) 2006, 2008 Stanislav Sedov <stas@FreeBSD.org>. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd August 4, 2008 28.Dt CPUCONTROL 8 29.Os 30.Sh NAME 31.Nm cpucontrol 32.Nd control utility for the 33.Xr cpuctl 4 34device. 35.Sh SYNOPSIS 36.Nm 37.Op Fl vh 38.Fl m Ar msr Ns Op = Ns Ar value 39.Bk 40.Ar device 41.Ek 42.Nm 43.Op Fl vh 44.Fl i Ar level 45.Bk 46.Ar device 47.Ek 48.Nm 49.Op Fl vh 50.Op Fl d Ar datadir 51.Fl u 52.Bk 53.Ar device 54.Ek 55.Sh DESCRIPTION 56The 57.Nm 58utility can be used to read and write arbitrary machine-specific 59CPU registers via the 60.Xr cpuctl 4 61special device. 62It can also be used to apply CPU firmware updates. 63.Pp 64The following options are available: 65.Bl -tag -width indent 66.It Fl d Ar datadir 67Where to look for microcode images. 68The option can be specified multiple times. 69.It Fl m Ar msr Ns Op = Ns Ar value 70Read/write the specified MSR. 71Both the MSR and the value should be given as a hex number. 72.It Fl i Ar level 73Retrieve CPUID info. 74Level should be given as a hex number. 75.It Fl u 76Apply CPU firmware updates. 77The 78.Nm 79utility will walk through the configured data directories 80and apply all firmware updates available for this CPU. 81.It Fl v 82Increase the verbosity level. 83.It Fl h 84Show help message. 85.El 86.Sh EXIT STATUS 87.Ex -std 88.Sh EXAMPLES 89The command 90.Pp 91.Dq Li "cpucontrol -m 0x10 /dev/cpuctl0" 92.Pp 93will read the contents of TSC MSR from CPU 0. 94.Pp 95To set the CPU 0 TSC MSR register value to 0x1 issue 96.Pp 97.Dq Li "cpucontrol -m 0x10=0x1 /dev/cpuctl0" 98.Pp 99The command 100.Pp 101.Dq Li "cpucontrol -i 0x1 /dev/cpuctl1" 102.Pp 103will retrieve the CPUID level 0x1 from CPU 1. 104.Pp 105To perform firmware updates on CPU 0 from images located at 106.Pa /usr/local/share/cpuctl/ 107use the following command: 108.Pp 109.Dq Li "cpucontrol -d /usr/local/share/cpuctl/ -u /dev/cpuctl0" 110.Sh SEE ALSO 111.Xr cpuctl 4 112.Sh HISTORY 113The 114.Nm 115utility first appeared in 116.Fx 8.0 . 117.Sh BUGS 118Yes, probably, report if any. 119.Sh AUTHORS 120The 121.Nm 122utility and this manual page was written by 123.An Stanislav Sedov Aq stas@FreeBSD.org . 124