error in assumptions in the handling of interrupts.

Ralph Blach rcblach at
Fri Jul 28 22:13:04 EST 2000

I would like explain a bug which I found in the 4xx interrupt controller
code yesterday.
In the ppc4xx_pic.c code their is a routine called


The purpose of this code is disable interrupts on the level and reset
the ISR.

This will NOT work because for Level interrupts, the ISR will cannot be
reset until
the interrupting source is cleared.

The ack to reset the ISR for interrupt must go in the


routine which  irq.c  calls after the interrupt routine has been

Chip Blach
IBM MicroElectronics
Raleigh, NC.

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