Object reuse protection with error correction

Details Object reuse protection with error correction Object reuse protection with error correction

1992-06-01

1993-09-28

Canney, Vincent P.

Excavating

371 372, 371 401, 371 22, G06F 1110

Patent

active

052492125

ABSTRACT:
A method and apparatus for providing error detection, correction and prevention of unauthorized access to data using memory tags. The method and apparatus includes computing an original error detection/correction code associated with a data word. The original error detection/correction code, using a CPU and a subject identification register, is copied to a tag associated with the data word when an original subject writes the data word into a memory. A single-error-correction/double-error detection (SEC/DED) device applies a first bias to the tag to create a first-biased error detection/correction code when the memory is assigned to a first subject. The SEC/DED device applies a second bias to create a twice-biased error detection/correction code when a second subject attempts to access the data word. Access to the data word is denied if the twice-biased error detection/correction code comprises an uncorrectable error.

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patent: 4926476 (1990-05-01), Covey
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An article entitled "Capability Based Tagged Architectures" by L. Lopriore, IEEE Transactions on Computers, vol. C-33, No. 9, Sep. 1984, pp. 786-803.
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Excerpts from a PhD Dissertation entitled "Error Detection with Memory Tags" by Richard H. Gumpertz, Carnegie-Mellon University, Dec. 1981, excerpts from pp. 38, 39, 40, 51, and 52.
An article entitled "Modern Computer Concepts" by E. J. Laurie, Fellow, IBM Systems Research Institute, The IBS 360 Series, published by South-Western Publishing Co., Burlingame, Calif., copyright 1970, pp. 270-271.
An article entitled "On the Advantages of Tagged Architecture" by E. A. Feustel, IEEE Transactions on Computers, vol. C-22, No. 7, Jul. 1973, pp. 644-656.
An article entitled "Tagged Architecture: How Compelling Are its Advantages?" by E. F. Gehringer and J. Leslie Keedy, IEEE 1985, pp. 162-170.

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