112 lines
3.7 KiB
Groff
112 lines
3.7 KiB
Groff
.\"-
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.\" Copyright (c) 2008 Rui Paulo
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 23, 2012
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.Dt AMDTEMP 4
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.Os
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.Sh NAME
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.Nm amdtemp
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.Nd device driver for
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.Tn AMD
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processor on-die digital thermal sensor
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device amdtemp"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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amdtemp_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the on-die digital thermal sensor present
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in
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.Tn AMD
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Family 0Fh, 10h, 11h, 12h, 14h, and 15h processors.
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.Pp
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For Family 0Fh processors, the
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.Nm
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driver reports each core's temperature through sysctl nodes, named
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.Va dev.amdtemp.%d.core{0,1}.sensor{0,1} .
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The driver also creates
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.Va dev.cpu.%d.temperature
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in the corresponding CPU device's sysctl tree, displaying the maximum
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temperature of the two sensors located in each CPU core.
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.Pp
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For Family 10h, 11h, 12h, 14h, and 15h processors, the driver reports each
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package's temperature through a sysctl node, named
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.Va dev.amdtemp.%d.core0.sensor0 .
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The driver also creates
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.Va dev.cpu.%d.temperature
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in the corresponding CPU device's sysctl tree, displaying the temperature
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of the shared sensor located in each CPU package.
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.Sh SYSCTL VARIABLES
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The following variable is available as both
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.Xr sysctl 8
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variable and
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.Xr loader 8
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tunable:
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.Bl -tag -width indent
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.It Va dev.amdtemp.%d.sensor_offset
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.El
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Add the given offset to the temperature of the sensor.
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Default is 0.
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.Sh SEE ALSO
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.Xr loader 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 7.1 .
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.Sh AUTHORS
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.An Rui Paulo Aq rpaulo@FreeBSD.org
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.An Norikatsu Shigemura Aq nork@FreeBSD.org
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.An Jung-uk Kim Aq jkim@FreeBSD.org
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.Sh CAVEATS
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For Family 10h and later processors,
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.Do
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(the reported temperature) is a non-physical temperature measured on
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an arbitrary scale and it does not represent an actual physical
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temperature like die or case temperature.
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Instead, it specifies the processor temperature relative to the point
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at which the system must supply the maximum cooling for the processor's
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specified maximum case temperature and maximum thermal power dissipation
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.Dc
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according to
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.Rs
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.%T BIOS and Kernel Developer's Guide (BKDG) for AMD Processors
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.%U http://developer.amd.com/documentation/guides/Pages/default.aspx
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.Re
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