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:
Jan. 19, 2021
Filed:
Sep. 03, 2019
Microsoft Technology Licensing, Llc, Redmond, WA (US);
Eric Francis Robinson, Raleigh, NC (US);
Jason Panavich, Raleigh, NC (US);
Thomas Philip Speier, Wake Forest, NC (US);
Microsoft Technology Licensing, LLC, Redmond, WA (US);
Abstract
Facilitating page table entry (PTE) maintenance in processor-based devices is disclosed. In this regard, a processor-based device includes processing elements (PEs) configured to support two new coherence states: walker-readable (W) and modified walker accessible (M). The W coherence state indicates that read access to a corresponding coherence granule by hardware table walkers (HTWs) is permitted, but all write operations and all read operations by non-HTW agents are disallowed. The Mcoherence state indicates that cached copies of the coherence granule visible only to HTWs may exist in other caches. In some embodiments, each PE is also configured to support a special page table entry (SP-PTE) field store instruction for modifying SP-PTE fields of a PTE, indicating to the PE's local cache that the corresponding coherence granule should transition to the Mstate, and indicating to remote local caches that copies of the coherence granule should update their coherence state.