[PATCH] abort when core.img is too big

[Robert Millan]

With the addition of memdisk, it is too easy for user to create an image
big enough that would corrupt upper memory (starting with vga region).  This
happens at roughly ~600 kiB memdisk size.

This patch adds a check in grub-mkimage to prevent this.  I did also take
the opportunity to reuse the upper memory macro to avoid hardcoding its
address for VGA stuff.

Comments?

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call… if you are unable to speak?
(as seen on /.)

size_limit.diff
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