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authorCatalin Marinas <catalin.marinas@arm.com>2014-07-21 18:54:50 +0400
committerCatalin Marinas <catalin.marinas@arm.com>2014-07-23 18:28:15 +0400
commit383c2799113b00a5f12c820ff0fd3dfca9e5be89 (patch)
treef2f9788dcbfa62fe6160cae82e67b8d83eca5bc0 /Documentation/arm64
parent7078db46215f9137801a122f87ac31c504220a94 (diff)
downloadlinux-383c2799113b00a5f12c820ff0fd3dfca9e5be89.tar.xz
arm64: Add support for 48-bit VA space with 64KB page configuration
This patch allows support for 3 levels of page tables with 64KB page configuration allowing 48-bit VA space. The pgd is no longer a full PAGE_SIZE (PTRS_PER_PGD is 64) and (swapper|idmap)_pg_dir are not fully populated (pgd_alloc falls back to kzalloc). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Jungseok Lee <jungseoklee85@gmail.com>
Diffstat (limited to 'Documentation/arm64')
-rw-r--r--Documentation/arm64/memory.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt
index 8845d0847a66..344e85cc7323 100644
--- a/Documentation/arm64/memory.txt
+++ b/Documentation/arm64/memory.txt
@@ -45,6 +45,14 @@ Start End Size Use
fffffc0000000000 ffffffffffffffff 4TB kernel
+AArch64 Linux memory layout with 64KB pages + 3 levels:
+
+Start End Size Use
+-----------------------------------------------------------------------
+0000000000000000 0000ffffffffffff 256TB user
+ffff000000000000 ffffffffffffffff 256TB kernel
+
+
For details of the virtual kernel memory layout please see the kernel
booting log.