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:
Apr. 13, 2021
Filed:
Jun. 20, 2019
International Business Machines Corporation, Armonk, NY (US);
Dan F. Greiner, San Jose, CA (US);
Charles W. Gainey, Jr., Poughkeepsie, NY (US);
Lisa C. Heller, Rhinebeck, NY (US);
Damian L. Osisek, Vestal, NY (US);
Erwin Pfeffer, Lam, DE;
Timothy J. Slegel, Staatsburg, NY (US);
Charles F. Webb, Wappingers Falls, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
What is provided is an enhanced dynamic address translation facility. In one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Based on the origin address, a segment table entry is obtained which contains a format control field and an access validity field. If the format control and access validity are enabled, the segment table entry further contains an access control and fetch protection fields, and a segment-frame absolute address. Store operations to the block of data are permitted only if the access control field matches a program access key provided by either a Program Status Word or an operand of a program instruction being executed. Fetch operations from the desired block of data are permitted only if the program access key associated with the virtual address is equal to the segment access control field.