How to mask IRQ

Sergei Organov osv at
Wed Jun 1 13:09:55 UTC 2005

eric.valette at writes:

> Quoting Sergei Organov <osv at>:
> > leonp at writes:
> >
> > Sorry, but I fail to see how it supposed to work if your IRQ handler is
> > invoked when another IRQ handler is running. Your change to the
> > ppc_cached_irq_mask on exit from your IRQ handler will be overwritten on
> > return from another IRQ handler. Am I missing something?
> This is exactly why manipulating masks within one interrupt handler
> leads to non working code : what mask do you intend to restore and
> when?.

I believe I've already posted working solution that correctly emulates
hardware PIC with ability to mask/unmask individual interrupts earlier
in this thread.


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