amdtemp (4)

Leading comments

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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...

(The comments found at the beginning of the groff file "man4/amdtemp.4freebsd".)

NAME

amdtemp - device driver for AMD processor on-die digital thermal sensor

SYNOPSIS

To compile this driver into the kernel, place the following line in your kernel configuration file:

device amdtemp

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:

amdtemp_load="YES"

DESCRIPTION

The driver provides support for the on-die digital thermal sensor present in AMD Family 0Fh, 10h, 11h, 12h, 14h, and 15h processors.

For Family 0Fh processors, the driver reports each core's temperature through sysctl nodes, named dev.amdtemp.%d.core{0,1}.sensor{0,1} The driver also creates 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.

For Family 10h, 11h, 12h, 14h, and 15h processors, the driver reports each package's temperature through a sysctl node, named dev.amdtemp.%d.core0.sensor0 The driver also creates dev.cpu.%d.temperature in the corresponding CPU device's sysctl tree, displaying the temperature of the shared sensor located in each CPU package.

SYSCTL VARIABLES

The following variable is available as both sysctl(8) variable and loader(8) tunable:

dev.amdtemp.%d.sensor_offset

Add the given offset to the temperature of the sensor. Default is 0.

SEE ALSO

loader(8), sysctl(8)

HISTORY

The driver first appeared in Fx 7.1 .

AUTHORS

An Rui Paulo Aq rpaulo@FreeBSD.org An Norikatsu Shigemura Aq nork@FreeBSD.org An Jung-uk Kim Aq jkim@FreeBSD.org

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

BIOS and Kernel Developer's Guide (BKDG) for AMD Processors