lkml.org 
[lkml]   [1997]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRE: pentium 4MB pages question for you MMU hackers
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
dpates@cavern.nmsu.edu

"What'll you two lovable plush toys have?"
"How 'bout a root beer popsicle and an Orange Julius? What about you,
Max?"
"Dishwater! And put it in a dirty glass!"
-Sam & Max
"Fair Wind to Java"


\
 
 \ /
  Last update: 2005-03-22 13:38    [W:2.375 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site