The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1995
Filed:
Jan. 03, 1992
James G Brenza, Putnam Valley, NY (US);
Joseph M Gdaniec, Vestal, NY (US);
Peter H Gum, Poughkeepsie, NY (US);
Kathryn M Jackson, Poughkeepsie, NY (US);
Mark M Maccabee, Kingston, NY (US);
Casper A Scalzi, Poughkeepsie, NY (US);
Bhaskar Sinha, Wappingers Falls, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An addressing method using large addresses in a guest/host environment within a computer system. The guests are operating-systems, and the host is a hypervisor program. Each guest has a guest real address space (guest RAS) mapped onto a host large real address space (host LRAS) using means disclosed herein. To do this, each guest RAS is first assigned to a contiguous part of a host large virtual address space (LVAS) by assigning each guest RAS to one or more contiguous units of virtual addressing in the host LVAS, each unit having a 2 gigabyte (GB) size. The host LVAS is represented by a sequence of entries (ALEs) in a host access list (AL), in which each ALE represents a 2 GB unit of virtual addressing in the host LVAS. An ALE is selected in the AL by using a high-order part of a host large virtual address (host LVA) representing a guest RA or LRA. A host LVA is generated from a guest RA for obtaining the guest address in host main storage. The host LVA is translated in a number of different ways to a host LRA, depending on the type of guest providing the corresponding guest RA or LRA. The guest types include V=V, V=FC, V=FD and V=R guests, which is indicated in a guest control block (GCB).