Date: Sun, 3 Nov 1996 14:00:34 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: smp@csn.net (Steve Passe) Cc: dg@Root.COM, hackers@freefall.freebsd.org, smp@freefall.freebsd.org, bde@zeta.org.au Subject: Re: ed0 timeouts Message-ID: <199611032100.OAA03152@phaeton.artisoft.com> In-Reply-To: <199611030900.CAA25770@clem.systemsix.com> from "Steve Passe" at Nov 3, 96 02:00:44 am
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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". Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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