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. 07, 2021
Filed:
Jun. 08, 2018
Arm Limited, Cambridge, GB;
Jason Parker, Sheffield, GB;
Matthew Lucien Evans, Cambridge, GB;
Gareth Rhys Stockwell, Cambridge, GB;
Djordje Kovacevic, Hitchin, GB;
ARM LIMITED, Cambridge, GB;
Abstract
Memory access circuitry enforces ownership rights for memory regions. A given memory region is associated with an owner realm specified from multiple realms, each realm corresponding to a portion of at least one software process executed by processing circuitry. In response to a realm switch from a source realm to a target realm at a more privileged exception level, state masking of a subset of architectural state associated with a source realm is performed to make the state inaccessible to a target realm. In response to a flush command following the realm switch, any of the subset of architectural state data not already saved to at least one realm execution context memory region is ensured to be saved.