linux-kernel - struct page for a non-physical-memory address

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Message-ID:  <loom.20060830T151949-979@post.gmane.org>
Date:	Wed, 30 Aug 2006 13:51:21 +0000 (UTC)
From:	yipee <yipeeyipeeyipeeyipee@...oo.com>
To:	linux-kernel@...r.kernel.org
Subject:  struct page for a non-physical-memory address

Hi,

I want to let a nopage mmap handler return a 'struct page' that
refers to a non-physical-memory address (e.g. some device memory).
pfn_valid(x) fails for this address (returning 0) so
pfn_to_page(x) can't be used.
How can I implement this functionality? Must the VM_IO bit be set?
Are there several methods to implement this?

thanks,
y

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