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:
Dec. 28, 2010
Filed:
Feb. 15, 2005
Rahoul Kumar Varma, Berkshire, GB;
Marc Richard Wicks, Surrey, GB;
Gareth Duncan, Berkshire, GB;
David Francis Mchale, Harrow, GB;
Mike Livesley, Berkshire, GB;
Rahoul Kumar Varma, Berkshire, GB;
Marc Richard Wicks, Surrey, GB;
Gareth Duncan, Berkshire, GB;
David Francis McHale, Harrow, GB;
Mike Livesley, Berkshire, GB;
ARM Limited, Cambridge, GB;
Abstract
A data processing apparatus is provided, which is operable to access data values associated with a respective address values. The data processing apparatus has: a processor; a main memory having a secure data values region; a cache; and cache interface logic having data transaction logic and security determination logic. The data transaction logic receives from the processor a data access request for accessing data in cache. The data access request has an associated address value and a security attribute. If the security attribute indicates that the request is a non-secure data-access request, the security determination logic determines, via a data region allocation table, whether the request is associated with the secure data values region of main memory and the non-secure data access request is allowed to complete if it is not associated with the secure data region.