The Tera Two-Level Operating System. Revision 1.2.

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
May 16, 1994
Accession Number
ADA324543

Tags

DTIC Thesaurus Topics

  • Computer Program Documentation
  • Computer Programs
  • Computers
  • Indicators
  • Motivation
  • Operating Systems

Fields of Study

  • Physics

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