Electrical computers and digital processing systems: support – Data processing protection using cryptography – Computer instruction/address encryption
Reexamination Certificate
2001-11-13
2011-11-01
Shiferaw, Eleni (Department: 2437)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
Computer instruction/address encryption
Reexamination Certificate
active
08051301
ABSTRACT:
A memory management unit (MMU) is disclosed for managing a memory storing data arranged within a plurality of memory pages. The MMU includes a security check unit (SCU) receiving a linear address generated during execution of a current instruction. The linear address has a corresponding physical address residing within a selected memory page. The SCU uses the linear address to access one or more security attribute data structures located in the memory to obtain a security attribute of the selected memory page. The SCU compares a numerical value conveyed by a security attribute of the current instruction to a numerical value conveyed by the security attribute of the selected memory page, and produces an output signal dependent upon a result of the comparison. The MMU accesses the selected memory page dependent upon the output signal.
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Barnes Brian C.
Schmidt Rodney W.
Strongin Geoffrey S.
Abyaneh Ali
Advanced Micro Devices , Inc.
Shiferaw Eleni
Williams Morgan & Amerson
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