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Date:      Fri, 31 May 2002 14:06:17 -0700
From:      Terry Lambert <tlambert2@mindspring.com>
To:        Bosko Milekic <bmilekic@unixdaemons.com>
Cc:        Aaro J Koskinen <akoskine@cc.helsinki.fi>, freebsd-hackers@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG
Subject:   Re: ICU_LEN with IO APIC
Message-ID:  <3CF7E5C9.82526E0A@mindspring.com>
References:  <Pine.OSF.4.30.0205311112190.30721-100000@sirppi.helsinki.fi> <20020531092348.B69469@unixdaemons.com>

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Bosko Milekic wrote:
> On Fri, May 31, 2002 at 12:12:00PM +0300, Aaro J Koskinen wrote:
> > Is there any particular reason why the number of interrupts is limited
> > to 32 on APIC systems? Is it just a conservative guess on the number of
> > interrupts anyone might want to need...?
> 
>   I'm not sure but perhaps this is historical (and now also required
>   again), but if we use a word to mask out interrupts than after 32 we
>   run out of bits.  "Who needs more than 32 interrupts anyway?!" :-)

Who needs more than 4?

Foo on PCI.

-- Terry

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