Bruce, for the low-level impared such as myself, can you give a quick
precis on teh difference between "fast" interrupt handlers in -current
and 'normal' interrupt handlers.

Do fast interrupt handlers enter through "trap()" ?
if they interrupt a user process, do they take on the cred of the running
do they return via doreti()
on returning do they check for ASTs and run userret()?

I have seen the answers to some  of these questions in the code, but
I'd like to get a more 'english' explanation from someone who seems
to understand them..


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