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