Re: Interrupts not being raised.

H. Peter Anvin (hpa@transmeta.com)
12 Feb 1999 20:23:39 GMT

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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