Messages in this thread |  | | Date | Fri, 28 Sep 2001 17:30:37 +0200 | From | Christoph Hellwig <> | Subject | Re: inverse mmap() available? |
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In article <3BB49438.1F2C59B3@berlin.de> you wrote:
> Hello! > > Is there a way to map user space memory into kernel address space, e.g. > that i don't have to call get_user(var,...) but simply use var = > *user_space_ptr? > > What i intend to do (as the next step) is to DMA-transfer data directly > between a PCI device and user space memory. The buffer in user space > should be allocated with malloc(), so allocating a buffer in kernel and > mmap()-ping it to user space is not the solution.. > > I guess this has been asked before, any links to further information > would be great.
map_user_kiobuf is what you want :) Some more explanation at:
ftp://ftp.openlinux.org/pub/people/hch/kio/kiobuf.txt
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