Subject: device driver docs / interrupts
To: None <current-users@NetBSD.ORG>
From: Robert Dobbs <firstname.lastname@example.org>
Date: 02/22/1995 18:02:49
Could some kind soul (perhaps he who claimed to be working on a
device driver doc) email me some generals about disabling/enabling
interrupts? specifically: is it always best to use splXXX() or
are there other forms like "disable_intr()" (used in isa/cy.c) which
are better under some circumstances?
how atomic are assignments? can "a = 0" be interrupted? how about
cp = p -> foo?
In the com.c driver, fairly sweeping segments of code are enclosed in
spltty()/splx(); was this a quick and dirty thing, or a reasonable use?