Generic DMA memory space mapping

Details Generic DMA memory space mapping Generic DMA memory space mapping

2005-11-30

2011-10-18

Kindred, Alford (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S022000

Reexamination Certificate

active

08041851

ABSTRACT:
In a data processing system having multiple input/output adapters, a DMA memory block is assigned to each adapter. The DMA memory block has a data area and a generic common control area. All adapters have the same translation control entry for the control area. The control area includes a mapped page assigned to each adapter request and an unmapped buffer space interposed between the mapped pages. By mapping the generic DMA memory, memory space which is not required by an adapter is not mapped unnecessarily. Because the generic DMA memory space is part of each adapter's DMA memory space, adapters are unable to write to partitions to which they do not belong and the possibility of cross-partition memory writes is reduced. Moreover, runaway writes to dedicated DMA memory space may be caught as soon as they occur.

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