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.\" $FreeBSD$ 27.\" 28.Dd March 27, 2015 29.Dt AMDTEMP 4 30.Os 31.Sh NAME 32.Nm amdtemp 33.Nd device driver for 34.Tn AMD 35processor on-die digital thermal sensor 36.Sh SYNOPSIS 37To compile this driver into the kernel, 38place the following line in your 39kernel configuration file: 40.Bd -ragged -offset indent 41.Cd "device amdtemp" 42.Ed 43.Pp 44Alternatively, to load the driver as a 45module at boot time, place the following line in 46.Xr loader.conf 5 : 47.Bd -literal -offset indent 48amdtemp_load="YES" 49.Ed 50.Sh DESCRIPTION 51The 52.Nm 53driver provides support for the on-die digital thermal sensor present 54in 55.Tn AMD 56Family 0Fh, 10h, 11h, 12h, 14h, 15h, and 16h processors. 57.Pp 58For Family 0Fh processors, the 59.Nm 60driver reports each core's temperature through sysctl nodes, named 61.Va dev.amdtemp.%d.core{0,1}.sensor{0,1} . 62The driver also creates 63.Va dev.cpu.%d.temperature 64in the corresponding CPU device's sysctl tree, displaying the maximum 65temperature of the two sensors located in each CPU core. 66.Pp 67For Family 10h, 11h, 12h, 14h, 15h, and 16h processors, the driver reports each 68package's temperature through a sysctl node, named 69.Va dev.amdtemp.%d.core0.sensor0 . 70The driver also creates 71.Va dev.cpu.%d.temperature 72in the corresponding CPU device's sysctl tree, displaying the temperature 73of the shared sensor located in each CPU package. 74.Sh SYSCTL VARIABLES 75The following variable is available as both 76.Xr sysctl 8 77variable and 78.Xr loader 8 79tunable: 80.Bl -tag -width indent 81.It Va dev.amdtemp.%d.sensor_offset 82.El 83Add the given offset to the temperature of the sensor. 84Default is 0. 85.Sh SEE ALSO 86.Xr loader 8 , 87.Xr sysctl 8 88.Sh HISTORY 89The 90.Nm 91driver first appeared in 92.Fx 7.1 . 93.Sh AUTHORS 94.An Rui Paulo Aq Mt rpaulo@FreeBSD.org 95.An Norikatsu Shigemura Aq Mt nork@FreeBSD.org 96.An Jung-uk Kim Aq Mt jkim@FreeBSD.org 97.Sh CAVEATS 98For Family 10h and later processors, 99.Do 100(the reported temperature) is a non-physical temperature measured on 101an arbitrary scale and it does not represent an actual physical 102temperature like die or case temperature. 103Instead, it specifies the processor temperature relative to the point 104at which the system must supply the maximum cooling for the processor's 105specified maximum case temperature and maximum thermal power dissipation 106.Dc 107according to 108.Rs 109.%T BIOS and Kernel Developer's Guide (BKDG) for AMD Processors 110.%U http://developer.amd.com/documentation/guides/Pages/default.aspx 111.Re 112