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Subjectvirtual memory question

Given the user-space virtual address of a page, is there a way to
convert this into a physical address (ensuring that the page is
swapped in, etc)?

I have a PCI bus master which can perform dma transfers and I want to
set up the dma registers on the device to write directly to my user
space [it is a a video capture card and I want to write directly to an
X shared memory image]

Cheers, Ian

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