Methods for context switching within a disk controller
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United States of America Patent
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Jun 4, 2002
Grant Date -
N/A
app pub date -
Apr 12, 2000
filing date -
May 5, 1999
priority date (Note) -
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Abstract
The present invention is related to methods and systems for context switching within a disk controller, allowing controller processors to efficiently switch between multiple tasks. In a first mode, a first memory is used to temporarily store data being transferred between a disk storage device coupled to the disk controller and a bus coupled to the disk controller. The transfer is managed by a disk controller processor. A first context is stored in a second memory coupled to the disk controller processor. In a second mode, the first memory is used to store a second context for later use by the disk controller processor. At least a portion of the first context information stored in the second memory is swapped with at least a portion of the second context information stored in the first memory at least partly in response to a first event. The swapped portion is then swapped back to the second memory in response to a second event.
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