Method and system for initiating and loading DMA controller registers by using user-level programs
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
Feb 2, 1996
filing date -
Feb 2, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a computer system the typically high overhead requirement for CPU instructions to operate a conventional direct memory access (DMA) controller are reduced to two user-level memory references via User-level Direct Memory Access (UDMA). The UDMA apparatus is located between the CPU and a DMA Controller, whereby the UDMA is programmed to use existing virtual memory translation hardware of the associated computer system to perform permission checking and address translation without Kernel involvement, and otherwise use minimal Kernel involvement for other operations.
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