Subject: Re: device driver docs / interrupts
To: None <firstname.lastname@example.org>
From: Charles M. Hannum <email@example.com>
Date: 02/22/1995 15:23:45
First of all, disable_intr() and enable_intr() are highly PC-specific.
Given that NetBSD runs of a few other architectures that can also use
ISA cards, we want to avoid adding more i386 dependencies where
Secondly, the spl*() functions are fairly cheap on an iAPX86, so there
is very little reason to avoid using them.
how atomic are assignments? can "a = 0" be interrupted? how about
cp = p -> foo?
The question is too vague. There are many cases where the compiler is
allowed to reorder operations. In addition, on some CPUs, if you
write across a page boundary, part of the write can be completed
before you process a page fault for the latter part.