From 383c2799113b00a5f12c820ff0fd3dfca9e5be89 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Mon, 21 Jul 2014 15:54:50 +0100 Subject: 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 Tested-by: Jungseok Lee --- Documentation/arm64/memory.txt | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'Documentation/arm64') 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. -- cgit v1.2.3-58-ga151