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Interrupt Handling
Registering Interrupt Handlers:
- Most drivers implement an Interrupt Service Routine
(ISR)
- DDI/DKI routine ddi_add_intr(9F) registers the driver's
ISR
- ddi_add_intr(9F) is usually called from driver's attach(9E)
routine
- ddi_remove_intr(9F) is usually called from driver's
detach(9E) routine
- Interrupt characteristics (IRQ, priority) embedded
in "interrupts" property
- Each device instance has its own "interrupts" property
- Driver specifies ISR to call when the device might
have interrupted
- Driver also specifies argument to be passed to that
ISR
- The argument allows the interrupt routine to distinguish
between multiple device instances that may have been registered to the
same ISR
- Argument is conventionally a pointer to the instance's
soft state structure
- A device may have more than one interrupt, though most
have only one
- If the device has more than one interrupt, the driver
adds each one in a separate call to ddi_add_intr(9F)
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