I heard about Ring0 & Ring3.but Where does ring2 get lost in between??!!!
Posted on 2003-11-28 12:11:32 by zakham
this might be enlighting:

groar wrote:

> Hi all,
> A question haunts me for some time ! I just want to know what are ring1
> and ring2... Can they be useful? Which are the levels of privileges of
> these ring ? I would be happy if somebody could bring an answer to me.
> thank you.
> groar

Most types of CPUs do not have that many rings. So most OSes only
use two of them, ring0 = kernel, ring3 = user.
Rings 1 and 2 are just two more levels of rights. Just like ring0 can
do some stuff with ring3 but not visa-versa, each level has access to
any lower level ring IE one with a higher number. (O>1>2>3)

I think OS2 used all four levels. 0= kernel, 1= drivers, 2= libs, 3= user.
Or something like that... I think adding OS2 to your googling might
shed more light on it.

Hope this helps.
Posted on 2003-11-28 12:19:32 by scientica