generic irq handler and stack?

[Tim Sander]

Hi

The interrupt handling on the i.mx35x seems to handle only one interrupt at a 
time. This generates larger then nessecary interrupt jitter. I am currently 
investigating to reprogram the AVIC to enable higher priority interrupts to 
interrupt lower priority interrupts. The mechanism is outlined in section 
13,3.8 of the IMX35 Reference Manual.

I thought about implementing the reprogramming of the AVIC in the 
ack() and end() callbacks. The problem is that i need to push the current 
priority on the stack but that doesn't seem to be possible with the generic 
irq subsystem? Do i need to implement the whole irq handler or is there some 
other way?

Thanks
Tim

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