Apparatus and method of memory access control for bus masters
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United States of America Patent
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Jul 26, 2005
Grant Date -
Nov 25, 2004
app pub date -
May 21, 2003
filing date -
May 21, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus of memory access control for bus masters are described. In one embodiment, the method includes the receipt of a direct memory access (DMA) request from a device. Once the DMA request is received, DMA access rights of the device are determined according to an access control list (ACL). Once determined, the device is granted DMA access according to the determined memory access rights of the device. In other words, if a DMA request coincides with DMA access rights assigned to the device, the DMA request is executed. Otherwise, the operating system may be notified of an unauthorized DMA request.
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