2.4, i386, virtual irq support ?

[Olivier Galibert]

The visual workstation includes a 8259 multiplexing floppy, serial and
parallel which ends up as one irqline (and one vector only).  I need
to be able to fan out this unique vector into different virtual irqs,
but that doesn't seems to be supported by
arch/i386/kernel/irq.c:do_IRQ().  Is there an easy way to do that?

Please note that this is not the same as a pure shared irq line, since
the 8259 tells which of the peripherals actually caused the irq, and
each source can be masked independently.

  OG.