The coretemp driver reports each core's temperature through the envsys(4) API. The driver has only 1 temperature sensor:
Sensor | Units | Typical Use |
sensor0 |
/etc/powerd/scripts/sensor_temperature
powerd(8)
script (if running) when the temperature has reached a critical state.
The 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.