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.conf(5):

           amdtemp_load="YES"

DESCRIPTION

     The amdtemp driver provides support for the on-die digital thermal sensor present in AMD Family 0Fh, 10h,
     11h, 12h, 14h, 15h, 16h, and 17h processors.

     For Family 0Fh processors, the amdtemp 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, 15h, 16h, and 17h 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 amdtemp driver first appeared in FreeBSD 7.1.

AUTHORS

     Rui Paulo <rpaulo@FreeBSD.org>
     Norikatsu Shigemura <nork@FreeBSD.org>
     Jung-uk Kim <jkim@FreeBSD.org>

CAVEATS

     For Family 10h and later processors, “(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” according to BIOS and Kernel Developer's Guide (BKDG) for AMD Processors,
     http://developer.amd.com/resources/developer-guides-manuals/.