Subject: Re: Help port swsusp to ppc.
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
       ncunningham@users.sourceforge.net, Hugang <hugang@soulinfo.com>,
       ncunningham@clear.net.nz,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Debian GNU/Linux PPC <debian-powerpc@lists.debian.org>
In-Reply-To: <20040120113630.GA380@elf.ucw.cz>
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Date: Tue, 20 Jan 2004 22:44:21 +1100
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On Tue, 2004-01-20 at 22:36, Pavel Machek wrote:
> Hi!
> 
> > > Well, *all* the data pages are saved, so that would be okay (even if
> > > they changed, as I'm replacing all the data pages, that should work),
> > > but I'm not saving kernel text for example.
> > 
> > Ahh... that's an interesting point. You aren't saving kernel text. I'm
> > not sure how that could be a problem for me. I think i'll just save it
> > along with the image though. 
> 
> Also pay attetion to page tables. I know that page tables "copy"
> routine is running from are same between suspend and resume kernel.

I plan to run everything provided by the suspended kernel actually. My idea
is to keep a handle to a page of the suspended kernel that contains that
code and just kick into it. Copying pages to their final location without
overriding the source pages is a bit of a funky job, but I had to do it
already with BootX so ... I'll work on that during one of the upcoming few
weeks hopefully, I'm a bit swamped with 3 different things at the moment.

ben.
 

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