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| author | Juergen Gross <jgross@suse.com> | 2016-04-22 09:35:04 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-04-22 10:03:24 +0200 |
| commit | 78b0634d2851d30ec5d289aefbae23b141de67f0 (patch) | |
| tree | 878e5240d567682aadd1e3fa817d2fc4b4982bc5 /Documentation | |
| parent | 1e2ae9ec072f3b7887f456426bc2cf23b80f661a (diff) | |
| download | lwn-78b0634d2851d30ec5d289aefbae23b141de67f0.tar.gz lwn-78b0634d2851d30ec5d289aefbae23b141de67f0.zip | |
x86/doc: Correct limits in Documentation/x86/x86_64/mm.txt
Correct the size of the module mapping space and the maximum available
physical memory size of current processors.
Signed-off-by: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: corbet@lwn.net
Cc: linux-doc@vger.kernel.org
Link: http://lkml.kernel.org/r/1461310504-15977-1-git-send-email-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/x86/x86_64/mm.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt index c518dce7da4d..5aa738346062 100644 --- a/Documentation/x86/x86_64/mm.txt +++ b/Documentation/x86/x86_64/mm.txt @@ -19,7 +19,7 @@ ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks ffffffef00000000 - ffffffff00000000 (=64 GB) EFI region mapping space ... unused hole ... ffffffff80000000 - ffffffffa0000000 (=512 MB) kernel text mapping, from phys 0 -ffffffffa0000000 - ffffffffff5fffff (=1525 MB) module mapping space +ffffffffa0000000 - ffffffffff5fffff (=1526 MB) module mapping space ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole @@ -31,8 +31,8 @@ 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 bits of address space, -but we support up to 46 bits. This expands into MBZ space in the page tables. +Current X86-64 implementations support up to 46 bits of address space (64 TB), +which is our current limit. This expands into MBZ space in the page tables. We map EFI runtime services in the 'efi_pgd' PGD in a 64Gb large virtual memory window (this size is arbitrary, it can be raised later if needed). |