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Re: 64 Bit Support?

From: Andrei E. Warkentin
Subject: Re: 64 Bit Support?
Date: Sun, 17 Jun 2007 12:29:43 -0700

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. 

Andrei Evgenievich Warkentin
Cell: (+1) (847) 321-15-55

17.06.2007, в 4:03, Jeroen Dekkers писал(а):

At Sun, 17 Jun 2007 11:37:15 +0200,
Stefan Reinauer wrote:

* Robert Millan <address@hidden> [070617 11:26]:
On Sun, Jun 17, 2007 at 02:16:41AM +0200, Jeroen Dekkers wrote:
At Sun, 17 Jun 2007 17:11:44 -0600,
David Broadfoot wrote:
I am wondering if there is plans for Grub 2 to be able to be compiled 
and run in a 64 bit enviroment. I am a part of the Cross-LFS Dev. team, 
and Under the pure 64 bit system, we have to use a 32 static version of 
grub compiled on a 32 computer in order to get it to boot, or use 
*Cough* lilo.

Thanks for your time

Interesting would also be to boot pure 64bit kernels. I think some of
the BSDs have their bootloader switch to 64bit long mode, so the kernel
does not have to dot this anymore. Maybe grub could do the same thing.

To enable long mode you have to enable paging and I don't think the
bootloader should be doing things like that. I also don't see any
problems with the OS enabling long mode.

Jeroen Dekkers

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