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To: linux-kernel@vger.kernel.org
From: yipee <yipeeyipeeyipeeyipee@yahoo.com>
Subject: Re: changing physical page
Date: Fri, 3 Feb 2006 04:58:07 +0000 (UTC)
Message-ID: <loom.20060203T055339-322@post.gmane.org>
References: A<loom.20060202T160457-366@post.gmane.org> <Pine.LNX.4.61.0602021047350.20707@chaos.analogic.com> <Pine.LNX.4.61.0602021138001.21010@chaos.analogic.com>
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linux-os (Dick Johnson <linux-os <at> analogic.com> writes:

[snip]
 
> If your program(s) rely upon being in some physical location,
> they are broken. Even with mlockall(), you just keep them
> where they are, not where you'd like them to be. If you
> are trying to DMA into/out-of user-space, there is only
> ONE way to do it. Your driver allocates DMA-able pages and
> your code mmaps() it into user-space. That way, the page(s)
> are always present and have the right attributes. If you
> malloc() something, then try to "convert" in the kernel
> through your driver, the code's broken.

And all this page-moving for getting contiguous DMA memory, happens today on
x86_64 kernels?
Can you please give me a pointer to the source code?


Thanks


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