> > especially if you want to do it right on the BX. But you can do this and rtlinux
> > does
>
> There is already desc->handler->ack(irq) in do_IRQ which does that. Is any
> more special handling needed?
You need to keep the IRQ line masked not just ack it. The code for handling all
the BX and other cases is there but its a bit more than 3 clock cycles long
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