Merging direct memory access windows
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United States of America Patent
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Aug 11, 2015
Grant Date -
Feb 26, 2015
app pub date -
Aug 22, 2013
filing date -
Aug 22, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A computing device may merge two translation tables used when performing a DMA operation into a single, combined translation table. To merge the translation tables, the computing device may update a register in the IOMMU to include a pointer to the combined translation table. In addition, the IOMMU may clear one of the registers from having a pointer to one of the merged translation table. Doing so means the entries in this translation table are now no longer assigned. The IOMMU may update the register with the pointer to the combined translation table to include the unassigned entries in the combined translation table. In this manner, the entries from the two translation tables are merged into the single, combined table. The combined translation table may be owned or assigned to a service provider that originally owned one of the merged translation tables or to a completely different service provider.
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