Method for preventing transfer of data to corrupt addresses

Details Method for preventing transfer of data to corrupt addresses Method for preventing transfer of data to corrupt addresses

1998-03-31

1999-12-28

Chung, Phung M.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

714 42, 714718, 714799, 714819, G06F 1134

Patent

active

060095423

ABSTRACT:
A method of data transfer in a data processing system having at least one source buffer and at least one destination buffer. The source buffer includes a plurality of data blocks, each data block having an address and being for storage of data including an identifier uniquely identifying that data block. The destination buffer includes a plurality of data blocks corresponding to the data blocks of the source buffer, each destination block having an address and being for storage of data. Each source block identifier is a function of a corresponding destination block address. Transferring data from the source buffer to the destination buffer includes: (a) obtaining the address of a data block in the destination buffer to transfer data into; (b) obtaining the address of a corresponding data block in the source buffer to transfer data from; and (c) checking the integrity of said addresses before data transfer, including: (i) retrieving the source block identifier in the source block via the source block address; (ii) generating an expected identifier value for the source block from the address of the destination block via said function relation between the source block identifier and the destination block address; (iii) comparing the expected identifier value with the retrieved identifier value; and (iv) if there is a mismatch, signaling an error condition representing corruption of one or more of the source block and the destination block addresses.

REFERENCES:
patent: 4903194 (1990-02-01), Houdek et al.
patent: 5444722 (1995-08-01), Tran

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