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authorCatalin Marinas <catalin.marinas@arm.com>2013-10-23 16:50:07 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2013-11-05 17:23:52 +0000
commit847264fb7e73ade5b5e4b6eea3daa243a1f5217e (patch)
tree3688d8bf1cd8f06e8bff978922d14c79406f5ce8 /Documentation/arm64
parent122e2fa0d310d262cb85cf0b003032e5d2bc2ae7 (diff)
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arm64: Use 42-bit address space with 64K pages
This patch expands the VA_BITS to 42 when the 64K page configuration is enabled allowing 2TB kernel linear mapping. Linux still uses 2 levels of page tables in this configuration with pgd now being a full page. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'Documentation/arm64')
-rw-r--r--Documentation/arm64/memory.txt27
1 files changed, 26 insertions, 1 deletions
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt
index f28899d5c83e..5e054bfe4dde 100644
--- a/Documentation/arm64/memory.txt
+++ b/Documentation/arm64/memory.txt
@@ -21,7 +21,7 @@ The swapper_pgd_dir address is written to TTBR1 and never written to
TTBR0.
-AArch64 Linux memory layout:
+AArch64 Linux memory layout with 4KB pages:
Start End Size Use
-----------------------------------------------------------------------
@@ -46,6 +46,31 @@ ffffffbffc000000 ffffffbfffffffff 64MB modules
ffffffc000000000 ffffffffffffffff 256GB kernel logical memory map
+AArch64 Linux memory layout with 64KB pages:
+
+Start End Size Use
+-----------------------------------------------------------------------
+0000000000000000 000003ffffffffff 4TB user
+
+fffffc0000000000 fffffdfbfffeffff ~2TB vmalloc
+
+fffffdfbffff0000 fffffdfbffffffff 64KB [guard page]
+
+fffffdfc00000000 fffffdfdffffffff 8GB vmemmap
+
+fffffdfe00000000 fffffdfffbbfffff ~8GB [guard, future vmmemap]
+
+fffffdfffbc00000 fffffdfffbdfffff 2MB earlyprintk device
+
+fffffdfffbe00000 fffffdfffbe0ffff 64KB PCI I/O space
+
+fffffdfffbe10000 fffffdfffbffffff ~2MB [guard]
+
+fffffdfffc000000 fffffdffffffffff 64MB modules
+
+fffffe0000000000 ffffffffffffffff 2TB kernel logical memory map
+
+
Translation table lookup with 4KB pages:
+--------+--------+--------+--------+--------+--------+--------+--------+