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Date: Sun, 09 Feb 2003 02:50:55 +0100
From: Jerome de Vivie <jerome.devivie@free.fr>
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To: Rik van Riel <riel@conectiva.com.br>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mmap inside kernel memory.
References: <3E45A7C4.8F1EBDFA@free.fr> <Pine.LNX.4.50L.0302082159460.12742-100000@imladris.surriel.com>
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Rik van Riel wrote:
> 
> On Sun, 9 Feb 2003, Jerome de Vivie wrote:
> 
> > "mmap" seems to be design for mapping file or device inside a process
> > memory. Is it possible to map a file into the kernel virtual memory ?
> 
> In theory yes (using vmalloc space), but you really don't want to.

Yes, it's very tricky ! I have (na?vly) try this:

vaddr=vmalloc(len);
do_mmap(file ,kvaddr ,len ,PROT_READ|PROT_WRITE ,MAP_FIXED|MAP_PRIVATE
,0);

Here, do_mmap check if the addresse match inside current process and
return me -ENOMEM. Are there others functions which i could use to
associate this file and a vmalloc'ed space ?


j.

-- 
J?r?me de Vivie
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