Re: [PATCH][RFC] P4/Xeon Thermal LVT support

Maciej W. Rozycki (
Wed, 27 Mar 2002 16:24:02 +0100 (MET)

On Wed, 27 Mar 2002, Zwane Mwaikambo wrote:

> > > #define FIRST_DEVICE_VECTOR 0x31
> > > +#define THERMAL_APIC_VECTOR 0x32 /* Thermal monitor local vector */
> > > #define FIRST_SYSTEM_VECTOR 0xef
> >
> > You certainly want to select a different vector.
> Whats wrong with that vector? I tried to follow the guidelines as
> specified in hw_irq.h and opted to go for the lower priority ones, or
> is the vector not serviceable due to its range?

You can't use a vector that is in the range assigned to I/O APIC
interrupts (i.e. 0x31 - 0xee). Otherwise you'll get an overlap when the
vector gets assigned to an ordinary IRQ line. Also you probably want a
high-priority interrupt as the condition is serious, if not critical --
system failures, such as bus exceptions, machine check faults, parity
errors, power failures, etc. demand a high priority service.

+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+        e-mail:, PGP key available        +

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