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Question about prioritized ARM interrupt

Offline Yang Fang over 9 years ago

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.

Offline Yang Fang over 9 years ago

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

Thank you very much, folks.
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Offline Vaibhav Malik over 9 years ago

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

Eric,

In case you are wondering around the software changing priority of the interrupt at run time before processor acknowledges the interrupt, then it is captured under spurious interrupt category (though it is unlikely from your question but just thought to share it)

Vaibhav
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Offline Vaibhav Malik over 9 years ago

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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Offline Alban Rampon over 9 years ago

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

Hi Eric,

I'm afraid that would be depending on the type of interrupt/archi.
I would recommend the ARM Generic Interrupt Controller - ARM IHI 0048B (PDF) spec document.
Then, looking at page 16 and the Interrupt States and Types, you can first distinguish edge or level senstive interrupts. They would be handled differently...
I'm not sure about "blocked" word meaning and would advise you to look for "pending" keyword in that document.

Kindly,
Alban.

PS: Thanks Luke
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