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linux/Documentation/x86/x86_64/mm.txt

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Linux-2.6.12-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!
2005-04-17 00:20:36 +02:00
<previous description obsolete, deleted>
Virtual memory map with 4 level page tables:
[PATCH] x86-64: cleanup Doc/x86_64/ files Fix typos. Lots of whitespace changes for readability and consistency. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andi Kleen <ak@suse.de>
2007-02-13 13:26:23 +01:00
0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm
Linux-2.6.12-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!
2005-04-17 00:20:36 +02:00
hole caused by [48:63] sign extension
[PATCH] x86-64: cleanup Doc/x86_64/ files Fix typos. Lots of whitespace changes for readability and consistency. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andi Kleen <ak@suse.de>
2007-02-13 13:26:23 +01:00
ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole
x86: fix typo in address space documentation Fix a trivial typo in Documentation/x86/x86_64/mm.txt. [ Impact: documentation only ] Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: Rik van Riel <riel@redhat.com>
2009-05-06 04:07:07 +02:00
ffff880000000000 - ffffc7ffffffffff (=64 TB) direct mapping of all phys. memory
x86: 46 bit physical address support on 64 bits Extend the maximum addressable memory on x86-64 from 2^44 to 2^46 bytes. This requires some shuffling around of the vmalloc and virtual memmap memory areas, to keep them away from the direct mapping of up to 64TB of physical memory. This patch also introduces a guard hole between the vmalloc area and the virtual memory map space. There's really no good reason why we wouldn't have a guard hole there. [ Impact: future hardware enablement ] Signed-off-by: Rik van Riel <riel@redhat.com> LKML-Reference: <20090505172856.6820db22@cuia.bos.redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-05-05 23:28:56 +02:00
ffffc80000000000 - ffffc8ffffffffff (=40 bits) hole
ffffc90000000000 - ffffe8ffffffffff (=45 bits) vmalloc/ioremap space
ffffe90000000000 - ffffe9ffffffffff (=40 bits) hole
ffffea0000000000 - ffffeaffffffffff (=40 bits) virtual memory map (1TB)
Linux-2.6.12-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!
2005-04-17 00:20:36 +02:00
... unused hole ...
x86_64: fix mm.txt documentation Commit 85eb69a16aab5a394ce043c2131319eae35e6493 introduced 512 MiB sized kernel and 1.5 GiB sized module space but omitted to change documentation properly. Fix that. [Wasn't the hole intentional protection hole?] Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: hpa@zytor.com Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-12 15:43:37 +02:00
ffffffff80000000 - ffffffffa0000000 (=512 MB) kernel text mapping, from phys 0
x86-64, docs, mm: Add vsyscall range to virtual address space layout Add the end of the virtual address space to its layout documentation. Signed-off-by: Borislav Petkov <bp@alien8.de> Link: http://lkml.kernel.org/r/1362428180-8865-4-git-send-email-bp@alien8.de Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2013-03-04 21:16:18 +01:00
ffffffffa0000000 - ffffffffff5fffff (=1525 MB) module mapping space
ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
Linux-2.6.12-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!
2005-04-17 00:20:36 +02:00
[PATCH] x86-64: cleanup Doc/x86_64/ files Fix typos. Lots of whitespace changes for readability and consistency. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andi Kleen <ak@suse.de>
2007-02-13 13:26:23 +01:00
The direct mapping covers all memory in the system up to the highest
[PATCH] x86_64: Some clarifications for Documention/x86_64/mm.txt I got some questions on this, so just fix up the documentation. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-05 17:25:54 +01:00
memory address (this means in some cases it can also include PCI memory
[PATCH] x86-64: cleanup Doc/x86_64/ files Fix typos. Lots of whitespace changes for readability and consistency. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andi Kleen <ak@suse.de>
2007-02-13 13:26:23 +01:00
holes).
[PATCH] x86_64: Some clarifications for Documention/x86_64/mm.txt I got some questions on this, so just fix up the documentation. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-05 17:25:54 +01:00
Linux-2.6.12-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!
2005-04-17 00:20:36 +02:00
vmalloc space is lazily synchronized into the different PML4 pages of
the processes using the page fault handler, with init_level4_pgt as
reference.
[PATCH] x86-64: cleanup Doc/x86_64/ files Fix typos. Lots of whitespace changes for readability and consistency. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andi Kleen <ak@suse.de>
2007-02-13 13:26:23 +01:00
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.
Linux-2.6.12-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!
2005-04-17 00:20:36 +02:00
-Andi Kleen, Jul 2004
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