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:
Aug. 10, 2010
Filed:
Jun. 27, 2008
Thomas S. Mathews, Austin, TX (US);
Bruce Mealey, Austin, TX (US);
Pratap Chandra Pattnaik, Ossining, NY (US);
Ravi A. Shankar, Austin, TX (US);
Thomas S. Mathews, Austin, TX (US);
Bruce Mealey, Austin, TX (US);
Pratap Chandra Pattnaik, Ossining, NY (US);
Ravi A. Shankar, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method, system, and program key-controlled object-based memory protection are provided. A processing unit includes an authority check for controlling access by the processing unit to pages of memory according to whether a hardware protection key set currently loaded in an authority mask register allows access to the pages. In particular, each page of memory is assigned a page key number that indexes into the hardware protection key set. The currently loaded hardware protection key set specifies those page key numbers that are currently accessible to the processing unit for the execution context. Each hardware key within the hardware protection key set may be associated with a particular data object or group of data objects. Thus, effectively, the currently loaded hardware protection key set identifies which data objects or groups of data objects are currently accessible. Software keys are assigned to data objects and dynamically mapped to hardware protection key sets, such that when a module is called, the software keys assigned to that module are mapped to the hardware protection key set to be loaded for controlling current access to memory.