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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-14 12:46:06 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-14 12:46:06 -0500
commit414f827c46973ba39320cfb43feb55a0eeb9b4e8 (patch)
tree45e860974ef698e71370a0ebdddcff4f14fbdf9e /Documentation/x86_64/mm.txt
parent86a71dbd3e81e8870d0f0e56b87875f57e58222b (diff)
parent126b1922367fbe5513daa675a2abd13ed3917f4e (diff)
Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6
* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6: (94 commits) [PATCH] x86-64: Remove mk_pte_phys() [PATCH] i386: Fix broken CONFIG_COMPAT_VDSO on i386 [PATCH] i386: fix 32-bit ioctls on x64_32 [PATCH] x86: Unify pcspeaker platform device code between i386/x86-64 [PATCH] i386: Remove extern declaration from mm/discontig.c, put in header. [PATCH] i386: Rename cpu_gdt_descr and remove extern declaration from smpboot.c [PATCH] i386: Move mce_disabled to asm/mce.h [PATCH] i386: paravirt unhandled fallthrough [PATCH] x86_64: Wire up compat epoll_pwait [PATCH] x86: Don't require the vDSO for handling a.out signals [PATCH] i386: Fix Cyrix MediaGX detection [PATCH] i386: Fix warning in cpu initialization [PATCH] i386: Fix warning in microcode.c [PATCH] x86: Enable NMI watchdog for AMD Family 0x10 CPUs [PATCH] x86: Add new CPUID bits for AMD Family 10 CPUs in /proc/cpuinfo [PATCH] i386: Remove fastcall in paravirt.[ch] [PATCH] x86-64: Fix wrong gcc check in bitops.h [PATCH] x86-64: survive having no irq mapping for a vector [PATCH] i386: geode configuration fixes [PATCH] i386: add option to show more code in oops reports ...
Diffstat (limited to 'Documentation/x86_64/mm.txt')
-rw-r--r--Documentation/x86_64/mm.txt22
1 files changed, 11 insertions, 11 deletions
diff --git a/Documentation/x86_64/mm.txt b/Documentation/x86_64/mm.txt
index 133561b9cb0c..f42798ed1c54 100644
--- a/Documentation/x86_64/mm.txt
+++ b/Documentation/x86_64/mm.txt
@@ -3,26 +3,26 @@
3 3
4Virtual memory map with 4 level page tables: 4Virtual memory map with 4 level page tables:
5 5
60000000000000000 - 00007fffffffffff (=47bits) user space, different per mm 60000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm
7hole caused by [48:63] sign extension 7hole caused by [48:63] sign extension
8ffff800000000000 - ffff80ffffffffff (=40bits) guard hole 8ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole
9ffff810000000000 - ffffc0ffffffffff (=46bits) direct mapping of all phys. memory 9ffff810000000000 - ffffc0ffffffffff (=46 bits) direct mapping of all phys. memory
10ffffc10000000000 - ffffc1ffffffffff (=40bits) hole 10ffffc10000000000 - ffffc1ffffffffff (=40 bits) hole
11ffffc20000000000 - ffffe1ffffffffff (=45bits) vmalloc/ioremap space 11ffffc20000000000 - ffffe1ffffffffff (=45 bits) vmalloc/ioremap space
12... unused hole ... 12... unused hole ...
13ffffffff80000000 - ffffffff82800000 (=40MB) kernel text mapping, from phys 0 13ffffffff80000000 - ffffffff82800000 (=40 MB) kernel text mapping, from phys 0
14... unused hole ... 14... unused hole ...
15ffffffff88000000 - fffffffffff00000 (=1919MB) module mapping space 15ffffffff88000000 - fffffffffff00000 (=1919 MB) module mapping space
16 16
17The direct mapping covers all memory in the system upto the highest 17The direct mapping covers all memory in the system up to the highest
18memory address (this means in some cases it can also include PCI memory 18memory address (this means in some cases it can also include PCI memory
19holes) 19holes).
20 20
21vmalloc space is lazily synchronized into the different PML4 pages of 21vmalloc space is lazily synchronized into the different PML4 pages of
22the processes using the page fault handler, with init_level4_pgt as 22the processes using the page fault handler, with init_level4_pgt as
23reference. 23reference.
24 24
25Current X86-64 implementations only support 40 bit of address space, 25Current X86-64 implementations only support 40 bits of address space,
26but we support upto 46bits. This expands into MBZ space in the page tables. 26but we support up to 46 bits. This expands into MBZ space in the page tables.
27 27
28-Andi Kleen, Jul 2004 28-Andi Kleen, Jul 2004