Method and system for performing DMA transfers using operating system allocated I/O buffers
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United States of America Patent
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Jul 22, 2003
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N/A
app pub date -
Feb 29, 2000
filing date -
Feb 29, 2000
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Abstract
A method and system for performing direct memory access (DMA) transfers using operating system allocated I/O buffers provides a mechanism for device to device transfers without utilizing global system memory. Memory is allocated on a local bus to which both devices have a requested degree of affinity and transfers are performed to and from this memory. Operating system routines provide for selection of global system memory or local memory based on whether there is local memory available to which both devices have a requested degree of affinity. The memory can be deallocated after each transfer and reallocated for each subsequent transfer.
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