Method and apparatus for manipulating direct memory access transfers
US8006001B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2004 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Mar 7, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A mechanism is provided for removal of instructions for context re-evaluation. The mechanism receives an external request to perform the instruction remove. In response to this external request, the mechanism next determines when the state of the system is stable for allowing the instruction remove. Then the mechanism creates a first event to remove a current data instruction in a DMA, if present, and merge it back onto the list of pending contexts from where it originated. The mechanism waits for feedback that the first event has completed. Then the mechanism creates a second event to remove a pending data instruction that was chosen to be next in the DMA, if present, and merge it back onto the list of pending contexts from where it originated. Finally the mechanism waits for feedback that the second event has completed. The merging of contexts back onto the pending list from where they originated aborts any activity related to preparing further data instructions and holds off further decisions about which context to DMA next until the instruction remove procedure is completed and a correct priority decision can be made again. The result of the ability to remove instructions is th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.