Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output access regulation
Reexamination Certificate
2005-02-03
2009-08-11
Tsai, Henry W. H. (Department: 2184)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output access regulation
C710S240000, C711S165000
Reexamination Certificate
active
07574537
ABSTRACT:
A method, apparatus, and computer program product are disclosed in a data processing system for migrating data pages subject to DMA access by temporarily disabling selected DMA operations within a physical I/O adapter. A determination is made as to whether to disable data access DMA capabilities of the physical I/O adapter. An operating mode of the physical I/O adapter is set to a particular mode utilizing a mode bit according to the determination of whether to disable data access DMA capabilities. Only data access DMA capabilities of the physical I/O adapter are disabled when the mode bit is set. Administrative services operations continue to be performed by the physical I/O adapter when the data access DMA capabilities of the physical I/O adapter are disabled.
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Arndt Richard Louis
Craddock David F.
Gregg Thomas Anthony
Schmidt Donald William
Gerhardt Diana R.
International Business Machines - Corporation
Mamo Elias
Tsai Henry W. H.
Yee & Associates P.C.
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