Date: Sun, 03 Nov 1996 14:15:59 -0700 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 Message-ID: <199611032115.OAA29180@clem.systemsix.com> In-Reply-To: Your message of "Sun, 03 Nov 1996 14:00:34 MST." <199611032100.OAA03152@phaeton.artisoft.com>
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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 -----BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.2 mQCNAzHe7tEAAAEEAM274wAEEdP+grIrV6UtBt54FB5ufifFRA5ujzflrvlF8aoE 04it5BsUPFi3jJLfvOQeydbegexspPXL6kUejYt2OeptHuroIVW5+y2M2naTwqtX WVGeBP6s2q/fPPAS+g+sNZCpVBTbuinKa/C4Q6HJ++M9AyzIq5EuvO0a8Rr9AAUR tBlTdGV2ZSBQYXNzZSA8c21wQGNzbi5uZXQ+ =ds99 -----END PGP PUBLIC KEY BLOCK-----
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