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From: Steve Passe <smp@csn.net>
To: Terry Lambert <terry@lambert.org>
cc: dg@Root.COM, hackers@freefall.freebsd.org, smp@freefall.freebsd.org,
        bde@zeta.org.au
Subject: Re: ed0 timeouts 
In-reply-to: Your message of "Sun, 03 Nov 1996 14:00:34 MST."
             <199611032100.OAA03152@phaeton.artisoft.com> 
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Date: Sun, 03 Nov 1996 14:15:59 -0700
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> > >   Yes, you can get another interrupt while servicing one. The driver loops
> > >until all interrupts are serviced, but there would be a window between when it
> > >thinks there are no more interrupts to service and returning to vector.s to
> > >unmask the interrupts. This window will exist in all ISA drivers.
> > 
> > bummer...
> > 
> > Intel says:
> > 
> > It is strongly recommended that first 82489 (ie APIC) should be unmasked
> > and then the device interrupt should be enabled.  By this sequence software
> > can ensure that always an edge will occur at the APIC input only after
> > the interrupt is unmasked.
> 
> Or: "Don't ack the thing until fater it's unmasked".

Huh?  forgive me, not enough sleep...  Is this sarcasm or a suggestion that
is going over my head?

--
Steve Passe	| powered by
smp@csn.net	|            FreeBSD

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