RE: pentium 4MB pages question for you MMU hackers

Derrik Pates (dpates@Cavern.NMSU.Edu)
Fri, 3 Jan 1997 18:01:56 -0700 (MST)

On Fri, 3 Jan 1997, Michael Nelson wrote:

> >The Intel CPUs (and most other CPUs that do multitasking) have what are
> >called "rings" which describe what kind of access the process can get to
> >the CPU. The lowest ringlevel (ring 0) is your kernel and driver code.
> >Most other CPUs only have 2 ringlevels, but Intel 32-bit CPUs (the 386 and
> >up) have 4 ringlevels, but no one has ever put anything but rings 0 and 3
> >to use.
> That's not true at all, there are several operating systems that have put the other rings to use. QNX and OS/2 to name a couple.
> -mike

Ahhh... Well, at least someone has put that feature to use. As far as I
had read tho, it hadn't been used. I guess I stand corrected.

Derrik Pates

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