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:
Oct. 23, 2007
Filed:
Jul. 27, 2004
Krste Asanovic, Cambridge, MA (US);
Emmett J. Witchel, Austin, TX (US);
Krste Asanovic, Cambridge, MA (US);
Emmett J. Witchel, Austin, TX (US);
Massachusetts Institute of Technology, Cambridge, MA (US);
Abstract
A fine-grained memory protection system and technique provide computer memory protection at least to a word granularity. A permissions table having permission values associated with a computer memory is arranged as protection domains. The permissions table can be cached in a protection lookaside buffer (PLD) and/or in sidecar registers. A software calls across protection domains (a cross-domain call) can be facilitated with a switch gate and a return gate. In some embodiments, a gate table is provided to store the switch gates and return gates, each having gate values. In some embodiments, a stack permission stable allows stack frames to be associated with the cross-domain call.
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