4 Jan
2002
4 Jan
'02
3:50 p.m.
On Fri, 4 Jan 2002, Bill Pechter wrote:
The problem is VMS uses 4 separate CPU modes, besides
the Unix kernel
and user modes which makes it difficult if not impossible to get it
right on x86.
32-bit x86 processors have 4 privelege levels for segment-level and I/O
protection, but only 2 privelege levels for page-level protection.
--
Jeffrey S. Sharp
jss(a)subatomix.com