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Two-Level Scheme for Maintaining Information Related to Invalid Segments

IP.com Disclosure Number: IPCOM000046887D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07

Publishing Venue

IBM

Related People

Authors:
Howell, JD Prasad, P Schulze, ES [+details]

Abstract

An operating system involves the following definitions: Segment: A block of sequential virtual addresses spanning 1 megabyte of virtual storage and beginning at an address that is a multiple of its size. Segment Table Entry (SGTE): A control block describing the attributes of a segment. When the segment is valid in storage, its SGTE points to the real address of its page table. Page: A block of sequential virtual addresses spanning 4 kilo-bytes of virtual storage and beginning at an address that is a multiple of its size. Page Table (PGT): A Page Table describes the attributes of pages in a segment. There is an entry in a PGT for each page in the segment. The PGTs may not always be addressable in storage.