Core temperature

[Dag-Erling Smørgrav]

I've written a quick-and-dirty driver for the built-in digital
temperature sensor in Intel's Core and Core 2 CPUs (and Xeons built on
the Core architecture).  The driver exports four sysctl nodes under
hw.coretemp:

  hw.coretemp.tjmax     Maximum core temperature (currently hardcoded
                        To 100°C, may actually be 85°C on some systems)

  hw.coretemp.delta     current temperature in °C below Tj(max)

  hw.coretemp.interrupt Lower 32 bits of the IA32_THERMAL_INTERRUPT MSR

  hw.coretemp.status    Lower 32 bits of the IA32_THERMAL_STATUS MSR

I intend to move these into dev.cpu.N in a later version.

Note that the driver currently makes no attempt to handle multi-CPU
systems; it will simply report the temperature of the CPU that contains
whichever core the requesting process happens to be running on.

  http://people.freebsd.org/~des/software/coretemp-20070810.diff

DES
-- 
Dag-Erling Smørgrav - des at des.no