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, 1978
Filed:
Apr. 25, 1977
Andrew Robert Heller, Mohegan Lake, NY (US);
Richard Lee Sites, San Diego, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The embodiment relates to special controls in a processor to prevent synonym entries in a translation lookaside buffer (DLAT) for a system which has DLAT entries that can concurrently translate virtual page addresses in multiple address spaces into real main storage page frame addresses. The controls use a synonym resolution register (SRR) which divides each address space in the system into common and private portions. Fields in the SRR indicate which portions are to be common to all address spaces, and which portions are private in each address space. A SRR control circuit selects a particular status field under control of a virtual address requesting main storage access. Each DLAT entry contains a common/private storage indicator which is controlled by the particular status field when the DLAT entry is loaded. When the DLAT entry is read, the private/common storage indicator controls whether the DLAT entry can only be used privately by the address space identified in the DLAT, or commonly by all address spaces.