amdtemp(4) - NetBSD Manual Pages

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AMDTEMP(4)              NetBSD 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°C accuracy.  Precision was improved in Revision G chips,
     which provide two more bits for 0.25°C steppings.  Each core has two tem-
     perature 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°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    µK       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
     <cnst@openbsd.org> whilst at the University of Waterloo.  It was adapted
     to NetBSD by Christoph Egger.

NetBSD 10.1                    January 28, 2018                    NetBSD 10.1