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. 06, 2009
Filed:
Aug. 18, 2003
Andrew B. Hastings, Eagan, MN (US);
Andrew B. Hastings, Eagan, MN (US);
Cray Incorporated, Seattle, WA (US);
Abstract
A system includes a memory, a plurality of pages held in the memory, an instruction translation look aside buffer (ITLB), a first data translation look aside buffer (DTLB), and a translation look aside (TLB) miss handler. The system also includes an executable/non-executable (x) indicator associated with each page in memory. The TLB miss handler sets the x-indicator for a particular page to indicate 'non-executable' when that page is accessed in a mode that allows writing to that page. The ITLB or the ITLB miss handler refuses to allow instructions from a page with an associated x-indicator of 'non-executable' to be loaded into the instruction buffer.