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Re: 64 Bit Support?


From: Jeroen Dekkers
Subject: Re: 64 Bit Support?
Date: Sun, 17 Jun 2007 23:06:03 +0200
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At Sun, 17 Jun 2007 12:29:43 -0700,
Andrei E. Warkentin wrote:
> Heh, UEFI x64 runs in long mode, and it has no problems doing things  
> like that. To linearly map the first 4GB you need a whole of 24KB  
> worth of page tables (using 2m pages). And the code to enter long  
> mode directly from RM is pretty trivial. RM->16PM->LM.

But UEFI doesn't need to be booted by a BIOS. We actually want to
install the GRUB2 core into the gap that exists between the partition
table and the first partition that usually starts on the second
head. This gap is 62 sectors, or 31KB. Just a bit more than your
page tables.

Jeroen Dekkers




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