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Rtker supports interrupt handling mechanism wherein it remains
responsive to the device while deferring accessing to the shared data
structures. Hence any ISR should be written in two halves.
- Immediate ISR This part is executed immediately the
interrupt is raised. Typically it acknowledges the device about the
interrupt.
- Bottom Half ISR This part is executed in a thread
context. Typically it does data transfers to/from the kernel.
Soumyadeb Mitra
2002-08-07