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From: Steve Passe <smp@csn.net>
To: dg@root.com
cc: 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 00:43:51 PST."
             <199611030843.AAA23866@root.com> 
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Date: Sun, 03 Nov 1996 02:00:44 -0700
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Hi,

>   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.

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

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