Date: Wed, 21 Jan 1998 02:38:20 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: weeteck@eecs.umich.edu (Wee Teck Ng) Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: fastintr interrupt handler Message-ID: <199801210238.TAA01077@usr08.primenet.com> In-Reply-To: <199801202248.RAA27603@singapore.eecs.umich.edu> from "Wee Teck Ng" at Jan 20, 98 05:48:47 pm
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> i've a question concerning the two different types of interrupt > handler: fastintr and slowintr. i've looked at the code in vector.s, > and somewhat understands what both do. i've also gathered from sio.c > that comm port 1 & 2 uses fastintr. my question is: > > - is it safe to use fastintr for keyboard? For input, probably; for LED changes... ugh. It would mean you'd need status so that the fastintr/slow stuff didn't interfere with each other. I think, though, that Bruce would hate using it for keyboards. It's really for stuff with small buffers that has to run to completion in the interrupt routine (and that's a watered down version of a very long explanation that Bruce posted a while back). The one thing I can think of that I might throw in there would be a floppy tape driver, and that would be hideous. 8-|. You can also ask Bruce directly (hopefully on the list so I can save what he says about it). 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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