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Re: [PATCH] efika memory issues

From: Hollis Blanchard
Subject: Re: [PATCH] efika memory issues
Date: Tue, 31 Jul 2007 10:55:09 -0500

On 7/31/07, Robert Millan <address@hidden> wrote:
> On Mon, Jul 30, 2007 at 05:35:28PM -0500, Hollis Blanchard wrote:
> > >         release hardcoded 0x4000:0xffc000 region.
> >
> > Hmm, does this actually work? Since GRUB itself falls within that
> > regions, the grub_ieee1275_release() call will mark all the memory
> > that the GRUB kernel and modules occupy as free, which means they will
> > be clobbered by heap usage.
> Didn't think of this.. (by chance it worked here, though).  How about using
> max(_end,0x4000) instead of 0x4000 ?
> (and adjusting region length not to overflow 0x1000000)

That won't quite work because the modules are loaded in the area
immediately following the kernel. However, because they are added in a
post-processing step, we don't know their end address at link time.

I think the simplest solution will be to allocate Efika's heap high,
as we talked about earlier. If the first "available" region is above
4MB, just reserve 4MB and don't worry about where it is. In general we
should try to keep 4MB free, but at the end of the day it's Efika's
fault and probably won't be a big deal for them anyways.


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