Rep:Re: Rep:Re: [f-cpu] Stack handling

["Nicolas Boulay" <nicolas.boulay@ifrance.com>]

That's OS stuff not cpu one.

nicO

-----Message d'origine-----
De: Ben Franchuk <bfranchuk@jetnet.ab.ca>
A: f-cpu@seul.org
Date: 24/07/02
Objet: Re: Rep:Re: [f-cpu] Stack handling

Nicolas Boulay wrote:
>>From the beginning we choose that they will be no hardware stack in
> F-cpu. Stacks are always a bottleneck. So this should be left on the
SW
> side.
> 
> If you want to avoid the need to save and restore data for call
> convention, we should use windowed register (that could be a great
thing
> to decrease memory pressure, because most of the time there is no
memory
> access). But the interrupt handler must be really optimised.

I say make interupts slow and force people to use well designed buffered
hardware.Task switching needs to be fast for threads than handle i/o.

> For interrupt management, it must have somethings as a lifo to be
> reentrant (nested interrupt). The linked list previously proposed is
> hard for the hardware and hard to be extended.
> 
One advantage of fixed Interupt and I/O locations (i/o page?) is that
they don't cause a page fault as they are static locations for the MMU.
Video/Sound/network buffers really need to be re-designed for MMU and
task
swaping.


-- 
Ben Franchuk - Dawn * 12/24 bit cpu *
www.jetnet.ab.ca/users/bfranchuk/index.html

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