> > > 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.
desc->handler->ack could be mask_and_ack_8259A, ack_edge_ioapic_irq,
mask_and_ack_level_ioapic_irq or ack_lapic_irq - it does exactly that -
masking and acking an interrupt.
> The code for handling all
> the BX and other cases is there but its a bit more than 3 clock cycles long
What magic does it have to do? Where is it in kernel?
Mikulas
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