[FreeVMS] Re: interrupts and ipls


Subject: [FreeVMS] Re: interrupts and ipls
roart@nvg.ntnu.no
Date: Tue Nov 20 2001 - 17:08:53 CET


On Mon, Nov 19, 2001 at 05:11:06PM +0100, roart@nvg.ntnu.no wrote:
>
> Who knows PC interrupts and Linux well enough to implement IPLs?

And FreeBSD, too?

> Since the PC does not have real IPLs, we may have to disable all interrupts
> at at lower priority and then enable them again.
> (I think FreeBSD does something like this)

I have not exactly found out what happens, but it seems FreeBSD masks them
away as pending, and then does them when the priority level is restored.
Still struggling to find the interrupt handlers and what is going on there.

With VMS being the interrupt-driven system it is, we really need to get
going on this "emulated" IPL bit, so we might get on with further scheduling,
ASTs, timing and the rest.

So, who knows PC interrupts well today?

-Roar Thronśs

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