linux-kernel - [x86_64] Implementation differences compared to x86

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Date:	Mon, 13 Oct 2008 14:26:19 +0200
From:	Eric Lacombe <tuxiko@...e.fr>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [x86_64] Implementation differences compared to x86_32

Hi,

Thanks again for all your answers.
I have some new questions with regard to x86_64 specificities.

- In x86_32, the physical memory is mapped on kernel land by way of 4 MB 
pages.
But for x86_64, I read that the physical memory was mapped by way of 4 KB 
pages. Is it true ? and in this case, why this choice ?

- Is the LDT used in x86_64 ?
I saw that the GDT_ENTRY_LDT is defined to 10 but when I read in the GDT at 
0x50 for the segment descriptor, there is nothing, the area is filled with 
zeros.

- Where can I find some documentation about the specifities of x86_64 compared 
to x86_32, particularly about memory management ?
Perhaps you can (or someone on the list) depict those specificities ?

Thanks in advance

	Eric
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