Messages in this thread |  | | Date | Tue, 21 Jan 1997 18:28:16 +0100 | From | Andries.Brouwer@cwi ... | Subject | DMA question |
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A physicist posed the following question: I have a device that does DMA. The area involved is mmapped by several user processes. The hardware does not allow user program access while the DMA is in progress. What Linux primitives can be used to prevent such access?
So, is there a reasonable way to put processes to sleep when they try to access a prespecified range of memory, so that the driver can wake them up when DMA has finished? Or perhaps to prevent scheduling of those processes that have this memory range in their address space?
Andries
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