Re: Process memory DMA access from devices, kiobuf ?

From: Gerd Knorr (kraxel@bytesex.org)
Date: Thu Mar 08 2001 - 13:53:28 EST

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In reply to: Terry Barnaby: "Process memory DMA access from devices, kiobuf ?"
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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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