1.\"- 2.\" Copyright (c) 2008 Rui Paulo 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.Dd September 5, 2017 27.Dt AMDTEMP 4 28.Os 29.Sh NAME 30.Nm amdtemp 31.Nd device driver for 32.Tn AMD 33processor on-die digital thermal sensor 34.Sh SYNOPSIS 35To compile this driver into the kernel, 36place the following line in your 37kernel configuration file: 38.Bd -ragged -offset indent 39.Cd "device amdtemp" 40.Ed 41.Pp 42Alternatively, to load the driver as a 43module at boot time, place the following line in 44.Xr loader.conf 5 : 45.Bd -literal -offset indent 46amdtemp_load="YES" 47.Ed 48.Sh DESCRIPTION 49The 50.Nm 51driver provides support for the on-die digital thermal sensor present 52in 53.Tn AMD 54Family 0Fh, 10h, 11h, 12h, 14h, 15h, 16h, and 17h processors. 55.Pp 56For Family 0Fh processors, the 57.Nm 58driver reports each core's temperature through sysctl nodes, named 59.Va dev.amdtemp.%d.core{0,1}.sensor{0,1} . 60The driver also creates 61.Va dev.cpu.%d.temperature 62in the corresponding CPU device's sysctl tree, displaying the maximum 63temperature of the two sensors located in each CPU core. 64.Pp 65For Family 10h, 11h, 12h, 14h, 15h, 16h, and 17h processors, the driver reports 66each package's temperature through a sysctl node, named 67.Va dev.amdtemp.%d.core0.sensor0 . 68The driver also creates 69.Va dev.cpu.%d.temperature 70in the corresponding CPU device's sysctl tree, displaying the temperature 71of the shared sensor located in each CPU package. 72.Sh SYSCTL VARIABLES 73The following variable is available as both 74.Xr sysctl 8 75variable and 76.Xr loader 8 77tunable: 78.Bl -tag -width indent 79.It Va dev.amdtemp.%d.sensor_offset 80.El 81Add the given offset to the temperature of the sensor. 82Default is 0. 83.Sh SEE ALSO 84.Xr coretemp 4 , 85.Xr loader 8 , 86.Xr sysctl 8 87.Sh HISTORY 88The 89.Nm 90driver first appeared in 91.Fx 7.1 . 92.Sh AUTHORS 93.An Rui Paulo Aq Mt rpaulo@FreeBSD.org 94.An Norikatsu Shigemura Aq Mt nork@FreeBSD.org 95.An Jung-uk Kim Aq Mt jkim@FreeBSD.org 96.Sh CAVEATS 97For Family 10h and later processors, 98.Do 99(the reported temperature) is a non-physical temperature measured on 100an arbitrary scale and it does not represent an actual physical 101temperature like die or case temperature. 102Instead, it specifies the processor temperature relative to the point 103at which the system must supply the maximum cooling for the processor's 104specified maximum case temperature and maximum thermal power dissipation 105.Dc 106according to 107.Rs 108.%T BIOS and Kernel Developer's Guide (BKDG) for AMD Processors 109.%U http://developer.amd.com/resources/developer-guides-manuals/ 110.Re 111