AMDTEMP(4) FreeBSD Kernel Interfaces Manual AMDTEMP(4)
NAME
amdtemp - AMD CPU on-die digital thermal sensor
SYNOPSIS
amdtemp* at amdnb_miscbus?
DESCRIPTION
The amdtemp driver provides support for the on-die digital thermal sensor
present on AMD K8, AMD Barcelona, AMD Phenom, AMD Griffin, AMD Fusion,
AMD Bobcat, and AMD Puma CPUs.
These sensors were officially introduced in AMD K8 Revision F processors,
and provide 0.5<degree>C accuracy. Precision was improved in Revision G
chips, which provide two more bits for 0.25<degree>C steppings. Each
core has two temperature sensors, and there are up to two cores per CPU
socket.
AMD Barcelona, AMD Phenom, AMD Griffin, AMD Fusion, AMD Bobcat, and AMD
Puma provide 0.125<degree>gC accuracy and provide one temperature sensor
for each CPU socket.
The amdtemp driver reports temperatures through the envsys(4) API.
Sensor Units Typical Use
CPUN sensor0 <mu>K cpuN temperature
SEE ALSO
envsys(4), envstat(8), powerd(8)
HISTORY
The amdtemp driver first appeared in OpenBSD 4.4 named "kate". It was
then ported to NetBSD 5.0. The driver has been renamed with support for
newer AMD CPUs.
AUTHORS
The amdtemp driver was written by Constantine A. Murenin
<
[email protected]> whilst at the University of Waterloo. It was adapted
to NetBSD by Christoph Egger.
FreeBSD 14.1-RELEASE-p8 January 28, 2018 FreeBSD 14.1-RELEASE-p8