From: Hugang <hugang@soulinfo.com>
To: Christoph Hellwig <hch@infradead.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Problem with remap_page_range/mmap
Date: Fri, 26 Mar 2004 17:58:29 +0800 [thread overview]
Message-ID: <20040326175829.083d7e72@localhost> (raw)
In-Reply-To: <20040326094656.A3812@infradead.org>
On Fri, 26 Mar 2004 09:46:56 +0000
Christoph Hellwig <hch@infradead.org> wrote:
> On Fri, Mar 26, 2004 at 10:36:19AM +0100, Christian Leber wrote:
> > What would be the good idea? I need at least 8 at least 4MB (2MB are
> > enough for 2.4) big physical memory pieces for DMA, mapped to
> > userspace.
> >
> > remap_page_range for ia64.
>
> Put the page structs into an array and return them from ->nopage. The
> kernel pagefault code will set up the ptes for you.
>
> Now actually getting 4MB of continguous memory is a different issue..
>
> I'm surprised you actually managed to get the allocation to succeed.
There is more detailed information about make page usable to user space,
http://www.xml.com/ldd/chapter/book/ch13.html
Hope that's useful.
--
Hu Gang / Steve
Linux Registered User 204016
GPG Public Key: http://soulinfo.com/~hugang/hugang.asc
prev parent reply other threads:[~2004-03-26 10:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-25 23:48 Problem with remap_page_range/mmap Christian Leber
2004-03-26 7:17 ` Christoph Hellwig
2004-03-26 9:36 ` Christian Leber
2004-03-26 9:46 ` Christoph Hellwig
2004-03-26 9:58 ` Hugang [this message]
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