Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 24 insertions, 0 deletions

diff --git a/Documentation/x86_64/mm.txt b/Documentation/x86_64/mm.txt
new file mode 100644
index 00000000000..662b73971a6
--- /dev/null
+++ b/Documentation/x86_64/mm.txt
@@ -0,0 +1,24 @@
+
+<previous description obsolete, deleted>
+
+Virtual memory map with 4 level page tables:
+
+0000000000000000 - 00007fffffffffff (=47bits) user space, different per mm
+hole caused by [48:63] sign extension
+ffff800000000000 - ffff80ffffffffff (=40bits) guard hole
+ffff810000000000 - ffffc0ffffffffff (=46bits) direct mapping of phys. memory
+ffffc10000000000 - ffffc1ffffffffff (=40bits) hole
+ffffc20000000000 - ffffe1ffffffffff (=45bits) vmalloc/ioremap space
+... unused hole ...
+ffffffff80000000 - ffffffff82800000 (=40MB)   kernel text mapping, from phys 0
+... unused hole ...
+ffffffff88000000 - fffffffffff00000 (=1919MB) module mapping space
+
+vmalloc space is lazily synchronized into the different PML4 pages of
+the processes using the page fault handler, with init_level4_pgt as
+reference.
+
+Current X86-64 implementations only support 40 bit of address space,
+but we support upto 46bits. This expands into MBZ space in the page tables.
+
+-Andi Kleen, Jul 2004