KATE(4) OpenBSD Programmer's Manual KATE(4)NAMEkate - AMD K8 temperature sensor
SYNOPSIS
kate* at pci?
DESCRIPTION
The kate driver provides support for the temperature sensors available in
the AMD K8 family of processors.
These sensors were officially introduced with Revision F Family 0Fh
processors, and provide 1 degC accuracy. Precision was improved in
Revision G chips, which provide two more bits for 0.25 degC steppings.
Each core may have two temperature sensors, and there may be up to two
cores per package.
Multiprocessor systems would have one instance of kate per each chip. In
each instance, temp0 and temp1 sensors correspond to the temperature
sensors on the first core, whereas temp2 and temp3 correspond to the
temperature sensors on the second core. As such, single core chips may
have two sensors, and dual-core dual-processor systems may have as many
as 8 temperature sensors in total.
Since many prior revisions of the chips appear to have valid readings for
at least some temperature sensors in the same address space as the
aforementioned revisions, the driver may also attach on such older
revisions provided that it finds some sensor readings that appear valid.
However, in such cases kate would not print the core revision information
into the dmesg.
Sensor values are made available through the sysctl(8) interface.
SEE ALSOintro(4), pci(4), sensorsd(8), sysctl(8)
BIOS and Kernel Developer's Guide for AMD NPT Family 0Fh Processors,
Publication # 32559, pp. 21--23 and pp. 179--184, July 2007.
Revision Guide for AMD NPT Family 0Fh Processors, Publication # 33610,
February 2008.
HISTORY
The kate driver first appeared in OpenBSD 4.4.
AUTHORS
The kate driver was written by Constantine A. Murenin <cnst@openbsd.org>
whilst at the University of Waterloo.
OpenBSD 4.9 February 4, 2010 OpenBSD 4.9
