提交 78b0634d 编写于 作者: J Juergen Gross 提交者: Ingo Molnar

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: NJuergen 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.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
上级 1e2ae9ec
...@@ -19,7 +19,7 @@ ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks ...@@ -19,7 +19,7 @@ ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
ffffffef00000000 - ffffffff00000000 (=64 GB) EFI region mapping space ffffffef00000000 - ffffffff00000000 (=64 GB) EFI region mapping space
... unused hole ... ... unused hole ...
ffffffff80000000 - ffffffffa0000000 (=512 MB) kernel text mapping, from phys 0 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 ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
...@@ -31,8 +31,8 @@ vmalloc space is lazily synchronized into the different PML4 pages of ...@@ -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 the processes using the page fault handler, with init_level4_pgt as
reference. reference.
Current X86-64 implementations only support 40 bits of address space, Current X86-64 implementations support up to 46 bits of address space (64 TB),
but we support up to 46 bits. This expands into MBZ space in the page tables. 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 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). memory window (this size is arbitrary, it can be raised later if needed).
......
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