Apparatus, system and method for controlling access to...

Details Apparatus, system and method for controlling access to... Apparatus, system and method for controlling access to...

2006-03-07

2006-03-07

Dang, Khanh (Department: 2111)

Electrical computers and digital data processing systems: input/

Access arbitrating

Hierarchical or multilevel arbitrating

C710S026000, C709S240000

Reexamination Certificate

active

07010633

ABSTRACT:
An apparatus, system and method for controlling access to facilities based on usage class of a requestor are provided. With the apparatus, system and method, a two level protection mechanism is provided for protecting host channel adapter (HCA) facilities from unauthorized access. With the present invention, a first level of access is provided through virtual address translation and a mechanism for determining if the requestor of access may access a system memory address space page associated with a real address to which the virtual address maps. A second level of access is provided through the allocation of usage classes and determining a required usage class for accessing an HCA facility.

REFERENCES:
patent: 6718392 (2004-04-01), Krause
patent: 6804729 (2004-10-01), Swanberg
patent: 2002/0184392 (2002-12-01), Parthasarathy et al.
patent: 2003/0046505 (2003-03-01), Craddock et al.
patent: 2004/0193833 (2004-09-01), Hampton et al.

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