On Wed, Nov 05, 2008 at 11:25:15AM -0600, Hollis Blanchard wrote:
>
> Module memory is allocated by grub_malloc(), but as you can see at
> http://svn.savannah.gnu.org/viewvc/trunk/grub2/kern/ieee1275/init.c?revision=1806&root=grub&view=markup
> the GRUB heap capped at 4MB (I don't mean size, I mean the end of the heap).
It's not really capped at 4 MB. It will cap it only when an heuristic tells it
there's still enough room for heap:
/* Avoid claiming anything above HEAP_MAX_ADDR, if possible. */
if ((addr < HEAP_MAX_ADDR) && /* if it's too
late, don't bother */
(addr + len > HEAP_MAX_ADDR) && /*
if it wasn't available anyway, don't bother */
(total + (HEAP_MAX_ADDR - addr) > HEAP_MIN_SIZE)) /*
only limit ourselves when we can afford to */
Argueably, this is not my best piece of code... today I'd have implemented a
payload relocator (like the one used by loader/i386/pc/multiboot.c) just so we
can happily use everything in /memory/available as heap.
And I'd even advice doing the same for powerpc (sharing code with i386 if
possible).
--
Robert Millan
The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
how) you may access your data; but nobody's threatening your freedom: we
still allow you to remove your data and not access it at all."
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