Method and apparatus for direct input and output in a...

Details Method and apparatus for direct input and output in a... Method and apparatus for direct input and output in a...

2006-03-16

2008-11-11

Peyton, Tammara (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S028000, C710S033000, C710S036000, C375S213000, C711S163000

Reexamination Certificate

active

07451249

ABSTRACT:
Method and apparatus for allowing a direct memory access unit to have access to a virtual address space is accomplished by receiving a request for memory access from the direct memory access device; determining a device identifier according to the received request for memory access; determining a memory protection schema according to the determined device identifier; and granting the direct memory access unit access to memory in accordance with the determined memory protection schema.

REFERENCES:
patent: 6519645 (2003-02-01), Markos et al.
patent: 2002/0138701 (2002-09-01), Suzuoki et al.
patent: 2005/0076186 (2005-04-01), Traut
patent: 2006/0146057 (2006-07-01), Blythe
patent: 1 271 327 (2003-01-01), None
IBM Technical Disclosure Bulletin, vol. 33, No. 11, pp. 398-399 (Apr. 1, 1991).
EP Search Report from counterpart EP 06 11 1395.

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