Core temperature

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=C2=B0C, may actually be 85=C2=B0C on some sy=
stems)

  hw.coretemp.delta     current temperature in =C2=B0C 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
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no
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