Accession Number : ADA324543

Title :   The Tera Two-Level Operating System. Revision 1.2.

Corporate Author : TERA COMPUTER CO SEATTLE WA

PDF Url : ADA324543

Report Date : 16 MAY 1994

Pagination or Media Count : 19

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.

Descriptors :   *DATA PROCESSING SECURITY, *OPERATING SYSTEMS(COMPUTERS), DATA MANAGEMENT, COMPUTER COMMUNICATIONS, SUBROUTINES, COMPUTER FILES, COMPUTER PROGRAM VERIFICATION, FIELDS(COMPUTER PROGRAMS).

Subject Categories : Computer Programming and Software
      Computer Systems Management and Standards

Distribution Statement : APPROVED FOR PUBLIC RELEASE