path: root/Documentation/x86/x86_64
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authorIngo Molnar <mingo@kernel.org>2013-11-26 12:23:04 +0100
committerIngo Molnar <mingo@kernel.org>2013-11-26 12:23:04 +0100
commit61d066977583803d333f1e7266b8ba772162dda4 (patch)
tree087d56e401422f1a8a165a782216aa6d0291a60e /Documentation/x86/x86_64
parentb975dc3689fc6a3718ad288ce080924f9cb7e176 (diff)
parentee41143027706d9f342dfe05487a00b20887fde7 (diff)
Merge tag 'efi-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/efi
Pull EFI virtual mapping changes from Matt Fleming: * New static EFI runtime services virtual mapping layout which is groundwork for kexec support on EFI. (Borislav Petkov) Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/x86/x86_64')
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt
index 881582f75c9c..c584a51add15 100644
--- a/Documentation/x86/x86_64/mm.txt
+++ b/Documentation/x86/x86_64/mm.txt
@@ -28,4 +28,11 @@ reference.
Current X86-64 implementations only support 40 bits of address space,
but we support up to 46 bits. This expands into MBZ space in the page tables.
+We map EFI runtime services in the aforementioned PGD in the virtual
+range of 64Gb (arbitrarily set, can be raised if needed)
+0xffffffef00000000 - 0xffffffff00000000
-Andi Kleen, Jul 2004

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