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. 03, 2018
Filed:
May. 20, 2016
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, Bavaria, 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 is first obtained and an initial origin address of a translation table of the hierarchy of translation tables is obtained. Based on the obtained initial origin, a segment table entry is obtained. The segment table entry is configured to contain a format control and access validity fields. If the format control and access validity fields are enabled, the segment table entry further contains an access control field, a fetch protection field, and a segment-frame absolute address. Store operations are permitted only if the access control field matches a program access key provided by any one of a Program Status Word or an operand of a program instruction being emulated. Fetch operations are permitted if the program access key associated with the virtual address is equal to the segment access control field or the fetch protection field is not enabled.