[Quickos-general] Re: Questions & Suggestions

[Andreas Z. <azh...@gm...>]

Aleksey Saushev wrote:

>   Well, I think it is better to suppose O.S. 386 CPU
> dependent. Not to write "as portable as we can".

Yes. 386sx...P4...K7/8/9/10

>   About peripherial requirements. I asked if we need program
> anything except FDD/HDD and console (at first & in future).

VGA,HERC,CGA?,TIMER, my special hardware

>   Also, should I relate the "quickness" to computational
> or to peripherial work.

It think theres no problem for both ones.

> I mean what to plan:
> fast task switching (cooperative or preemptive)

i prefer mix cooperative or preemptive - some task has to be
cooperative( ... need so write 128 bytes within 250?sec... ).
I want a my DOS back, 32bit advadages and multitasking.

> or better disk caching policy.

later. that not i think at this moment. if our kernel works, we
could optimize in this way.

>   Suggestions.
>   1. If we want really quick OS, we have to forget about
> swapping, paging, protection.

seldom if we need "hard"-realtime - therefor must forget swapping,
paging.
But most time we can go with preemptive and sometimes we can switch
to cooperative ("soft-realtime").

I think if we want to produce a safe os, we must present a preemptive
multitasking system with paging. if that works fine we can insert
cooperative tasks.
First a want a safe OS, i dont want to go the way which win3.1 win9x has
gone.
Only if you really need more control over you processor - then you can
switch
down protection. Most time we dont need.

>   Q: What do we want to throw away?
>      What do we want to see working?

First I want a working preemptive-pageing-kernel.

>   2. Booting from FAT.

yes. or from ROMFS because i want to start this os diskless. just from
ROM link network cards do

>   3. FAT support.

>   Q: Do you have any doc/code showing I/O from
> protected mode?

YES. i have a working pmode-demo.

>   4. Flat memory: no paging, no swapping, single address
> space.

its difficult to share data-memory among tasks (in a save way) without
paging. for most
tasks i prefer paging.

>   5. Operating shell for interractive debugging.
> (I think FORTH is the best way to organize it.)

I dont believe that its the best way.
But seeing is believing. :-)

--
Mfg Andreas Ziermann
b...@lo...
--
http://www.loet.de