I'm running OpenSolaris in the Simics full system simulator
(www.simics.net) and it can be configured to trigger events in the
simulated hardware when these types of instructions (which as you said,
do nothing in reality) occur. In this case I need the simulated hardware
to be notified when a processor enters the idle-loop.

 / Marcus


> will always zero the register, since sethi only sets the *high* bits.
> 
> What are you trying to do?
> 
> Cheers,
> - jonathan
> 

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