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SubjectRe: Process memory DMA access from devices, kiobuf ?
Date
Terry Barnaby wrote:
> Hi,
>
> We are doing work with FPGA's and have a Linux driver for a particular
> board that has these
> devices. For performance reasons the driver has the ability to DMA
> directly to process (user)
> memory. We have made use of the kiobuf routines such as
> "map_user_kiobuf()" to map into
> physical memory the user address space.
> I note that the RedHat kernels have a patched kernel containing the
> kiobuf code but the
> standard linux source does not right up to 2.4.2.

Huh? map_user_kiobuf() _is_ present in 2.4.2. See include/linux/iobuf.h

Gerd

--
Get back there in front of the computer NOW. Christmas can wait.
-- Linus "the Grinch" Torvalds, 24 Dec 2000 on linux-kernel
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