The Tera Two-Level Operating System. Revision 1.2.
TERA COMPUTER CO SEATTLE WA
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The Tera computer hardware provides for four privilege levels. These privilege levels are used to protect various parts of the system from each other. One level is reserved for very early initialization and as an invalid protection indicator. One is reserved for user mode programs. The other two are for normal use by the operating system OS. This document describes some of the motivation for using two privilege levels in the OS and discusses the way such an OS is built using the Tera tools.
- Computer Programming and Software
- Computer Systems Management and Standards