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From
SubjectRe: Interrupts not being raised.
Date
Followup to:  <E10BJOL-0000GF-00@devel2.axiom.internal>
By author: David Woodhouse <David.Woodhouse@mvhi.com>
In newsgroup: linux.dev.kernel
>
> I've now read setup.S, and can see where the PICs are reprogrammed to map
> IRQ0-15 onto int 0x20-0x2f. So how does the PIC generate the correct INT?
> Surely the CPU doesn't have that many external pins?
>

The PIC puts the vector number on the data bus during the INTACK
cycle.

-hpa
--
"Linux is a very complete and sophisticated operating system. There
are, and will be, large numbers of applications available for it."
-- Paul Maritz, Group Vice President for Platforms And Applications,
Microsoft Corporation [Reference at: http://www.kernel.org/~hpa/ms.html]

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