yoann@mandrakesoft.com wrote:
>
> Petko Manolov <petkan@spct.net> writes:
>
> > Most cpu architectures don't have more than two levels - kernel and
> > user.
>
> I don't see this as a problem, please explain...
OSes (like NT on x86) uses ring 0 privileged level (the highest) for
the microkernel and ring 1 (or 2) for the device drivers, file
systems, network protkols, etc. User level progs are in ring 3.
If you have just two rings you should put everything except the
kernel in user level.
> > AFAIK Linus don't like the idea of micro kernel and i bet it won't
> > happen soon (if happens at all ;-).
>
> agree :)))
>
> >
> > > The advantage is that there is really not many chance for the kernel
> > > to crash, as it only do minimal thing.
> > >
> > > If a driver crash, it doesn't disturb the kernel.
> >
> > Moving all drivers in user level is *bad* idea.
>
> It will clearly be slower, but please give reason for that thinking :)
This is not minor reason, but is not the most important. Imagine the
posibility any user can break your hdd or network driver. This can't
be called OS any more (may be DOS ;-)).
best,
Petkan
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This archive was generated by hypermail 2b29 : Thu Jun 15 2000 - 21:00:18 EST