Interrupt prioritization on linux for ppc440

Eugene Surovegin ebs at
Tue Apr 19 10:27:43 EST 2005

On Mon, Apr 18, 2005 at 04:11:02PM -0700, Shawn Jin wrote:


> However there could be a possible problem when a 2nd critical
> interrupt is asserted before the 1st one is served. Then fetching the
> VR returns the address for the 2nd interrupt. Of course if UIC can
> queue interrupts when calculating VRs, there wouldn't be such a
> problem.

According to the user manual, UIC indeed queues IRQs based on their 
priorities, so I guess there shouldn't be any problems.

Look at paragraphs titled "Vector generation scenarios".


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