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Question about prioritized ARM interrupt

Yang Fang
Note: This was originally posted on 3rd October 2011 at http://forums.arm.com

One simple question but I did not find a clear answer. In the prioritized ARM interrupt, low and same priority interrupt will be masked out, so only higher priority interrupt can stop current interrupt. But will the lower interrupt flags also blocked? So another way to ask the question is whether lower interrupt will be ignored or there is a queue which will execute lower priority interrupt after current interrupt is serviced? Thank you.
Parents
  • Note: This was originally posted on 5th October 2011 at http://forums.arm.com

    Eric,

    There is another concept of interrupt nesting or preemption where the concept is signaling of higher priority pending interrupts to a target processor before an active interrupt completes. When this occurs, the initial active interrupt is said to have been preempted where the processor must save the context and later restore the same while resuming.

    Vaibhav
Reply
  • Note: This was originally posted on 5th October 2011 at http://forums.arm.com

    Eric,

    There is another concept of interrupt nesting or preemption where the concept is signaling of higher priority pending interrupts to a target processor before an active interrupt completes. When this occurs, the initial active interrupt is said to have been preempted where the processor must save the context and later restore the same while resuming.

    Vaibhav
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