The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 2010
Filed:
May. 15, 2008
Daniel Robert Lipps, Kasson, MN (US);
Travis James Pizel, Rochester, MN (US);
Daniel Robert Lipps, Kasson, MN (US);
Travis James Pizel, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method, apparatus, and program product access memory resources of a computer using a group of direct access memory (DMA) devices. A first DMA device is designated a primary device after association with an active translation table (ATT), while a second DMA device is designated a backup device after association with an inactive translation table (ITT). A translation is entered into the ATT for the first DMA device to permit it to perform a DMA operation, while a translation is inhibited from being entered into the ITT for a second DMA device to prevent it from performing a DMA operation. Thereafter, the roles of the first and second DMA devices may be swapped by associating the first DMA device with the ITT and associating the second DMA device with the ATT. The computer may be a logically partitioned computer of the type that includes a plurality of logical partitions.