Messages in this thread | | | From | Michael Nelson <> | Subject | RE: pentium 4MB pages question for you MMU hackers | Date | Fri, 3 Jan 1997 18:42:34 -0500 |
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>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
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