Suggestions wanted

[Paul Goyette <paul%whooppee.com@localhost>]

While looking at including ADT7490 support in my recently-committed 
dbcool driver, I discovered that this beast implements a rather odd sort 
of sensor!

There's new PECI (Intel's "Platform Environment Control Interface") set 
of four sensors.  This is actually a communications path to the CPU 
which provides the actual sensor values.  Unfortunately, the spec calls 
for the PECI temp sensors to be reported as a _relative_ temperature, 
measured in degrees C.  The values are always negative (less than 0), 
and are relative to a CPU-specific Tcc thermal control circuit 
activation temperature.  There appears to be no way to access the value 
of Tcc, so it's apparently impossible to convert the relative readings 
to absolute ones.

I could just display these values as absolute temperatures, and they 
would mostly make sense when displayed in degreesC.  But if the user 
were to convert to degrees F (with envstat -f) the values would be off 
by 32F.

Alternatively, I could implement a new sensor type in sysmon_envsys(9) 
and envstat(8) for relative temperature sensors.

Or I could just ignore these sensors completely.

Are there any other options?

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