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Interrupt Handling (cont)
Interrupt Context:
- Interrupts are triggered asynchronously by external
events
- Interrupts do not run in user context
- Process-related data is not available from within ISRs
Classes of Interrupt:
- Two broad classes of interrupt: High-level and normal
interrupts
- Most interrupts on the system are normal interrupts
- Seldom must a device be configured to a high-level
interrupt
- High-level interrupts are handled much like traditional
UNIX interrupts
- A high-level interrupt has no process or thread context
of its own
- A high-level interrupt may not block for any reason
- A high-level ISR may only call mutex_enter(9F), the
associated mutex_exit(9F), and ddi_trigger_softintr(9F)
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