1.\" $NetBSD: cpuctl.8,v 1.12 2014/02/19 09:13:21 szptvlfn Exp $ 2.\" 3.\" Copyright (c) 2007, 2008, 2012 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Andrew Doran. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd December 23, 2013 31.Dt CPUCTL 8 32.Os 33.Sh NAME 34.Nm cpuctl 35.Nd program to control CPUs 36.Sh SYNOPSIS 37.Nm cpuctl 38.Op Fl v 39.Ar command 40.Op Ar arguments 41.Sh DESCRIPTION 42The 43.Nm 44command can be used to control and inspect the state of CPUs in the system. 45.Pp 46The first argument, 47.Ar command , 48specifies the action to take. 49Valid commands are: 50.Bl -tag -width XofflineXcpunoX 51.It identify Ar cpu 52Output information on the specified CPU's features and capabilities. 53Not available on all architectures. 54.It list 55For each CPU in the system, display the current state and time of the last 56state change. 57.It offline Ar cpuno 58Set the specified CPU off line. 59.Pp 60Unbound LWPs (lightweight processes) will not be executed on the CPU 61while it is off line. 62Bound LWPs will continue to be executed on the CPU, and device interrupts 63routed to the CPU will continue to be handled. 64A future release of the system may allow device interrupts to be re-routed 65away from individual CPUs. 66.Pp 67At least one CPU in the system must remain on line. 68.It online Ar cpuno 69Set the specified CPU on line, making it available to run unbound LWPs. 70.It ucode Op Ar file 71This applies the microcode patch on all CPUs. 72The default filename is used if no filename is specified. 73The 74.Cm identify 75command prints the installed version on that CPU. 76On success the 77.Cm identify 78command show different ucode versions before and after this command. 79.El 80.Pp 81Valid flags are: 82.Bl -tag -width indent 83.It Fl v 84Be more verbose. 85.El 86.Sh FILES 87.Bl -tag -width /dev/cpuctl -compact 88.It Pa /dev/cpuctl 89control device 90.It Pa /libdata/firmware/x86/amd/ 91The directory to install the microcode file for AMD CPUs into. 92The default filename is 93.Pa microcode_amd.bin 94for CPU families 0x10 to 0x14. 95The default filename is 96.Pa microcode_amd_famXXh.bin 97where 98.Dv XX 99is the CPU family starting with 15 (hex). 100Get it from 101.Lk http://www.amd64.org/microcode.html 102.El 103.Sh EXAMPLES 104Run 105.Dl cpuctl identify 0 106and you should see something like this: 107.Bd -literal -offset indent 108cpu0: UCode version: 0x1000080 109.Ed 110.Pp 111After applying the microcode patch with 112.Dl cpuctl ucode 113you can see with 114.Dl cpuctl identify 0 115that the patch got applied: 116.Bd -literal -offset indent 117cpu0: UCode version: 0x1000083 118.Ed 119.Sh SEE ALSO 120.Xr psrset 8 , 121.Xr schedctl 8 122.Sh HISTORY 123The 124.Nm 125command first appeared in 126.Nx 5.0 . 127