| CORETEMP(4) | Device Drivers Manual (x86) | CORETEMP(4) | 
coretemp —
coretemp* at cpu?
coretemp driver provides support for the on-die
  digital thermal sensor present on Intel Core and newer CPUs.
The temperatures can be observed by using the envsys(4) API or the envstat(8) command. Temperatures are reported for each core separately.
coretemp driver is able to send a
  critical event to the
  powerd(8) daemon. The script
  /etc/powerd/scripts/sensor_temperature will be
  executed by the daemon (if running) when the limit has been reached.
Michael Berktold and Tian Tian (Intel Corporation), CPU Monitoring With DTS/PECI, White Paper, http://edc.intel.com/Download.aspx?id=2612, September 2010.
coretemp driver first appeared in
  FreeBSD 7.0. It was later ported to
  NetBSD 5.0.
coretemp driver was written by Rui
  Paulo
  <rpaulo@FreeBSD.org>
  as part of a Google Summer of Code project. It was adapted to
  NetBSD by Juan Romero
  Pardines.
| February 23, 2010 | NetBSD 10.1 |