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Re: [Qemu-devel] [4239] x86/x86-64 MMU PAE fixes
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From: |
Stuart Brady |
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Subject: |
Re: [Qemu-devel] [4239] x86/x86-64 MMU PAE fixes |
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Date: |
Tue, 22 Apr 2008 23:37:17 +0100 |
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User-agent: |
Mutt/1.5.13 (2006-08-11) |
On Tue, Apr 22, 2008 at 11:19:24PM +0100, Stuart Brady wrote:
> The documentation I'm using:
>
> "Intel 64 and IA-32 Architectures Software Development Manual,
> Volume 3A: System Programming Guide, Part 1"
...
"AMD64 Architecture Programmer's Manual, Volume 2: System Programming"
gives a different story.
Only bits 52-63 are reserved (MBZ), although for PDEs and PTEs (but not
PDPEs, it would seem), bit 63 is the NX bit.
However, "The AMD x86-64 Architecture Programmers Overview" says that
"bits 63:52 in all page-table entry formats are available for use by
system software".
--
Stuart Brady