linux-kernel - [PATCH] Documentation/arm64: add memory layout with 4KB pages + VA39-bit

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Date:   Thu, 30 Sep 2021 18:50:26 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] Documentation/arm64: add memory layout with 4KB pages +
 VA39-bit

The 4KB pages + 3 levels (39-bit) combination is also widely used in
arm64 world, add the memory layout description for this combination.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
---
 Documentation/arm64/memory.rst | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/arm64/memory.rst b/Documentation/arm64/memory.rst
index 901cd094f4ec..d1745b570f0c 100644
--- a/Documentation/arm64/memory.rst
+++ b/Documentation/arm64/memory.rst
@@ -26,6 +26,23 @@ The swapper_pg_dir address is written to TTBR1 and never written to
 TTBR0.
 
 
+AArch64 Linux memory layout with 4KB pages + 3 levels (39-bit)::
+  Start			End			Size		Use
+  -----------------------------------------------------------------------
+  0000000000000000	0000007fffffffff	 512GB		user
+  ffffff8000000000	ffffffbfffffffff	 256GB		kernel logical memory map
+ [ffffffb000000000	ffffffbfffffffff]	  64GB		[kasan shadow region]
+  ffffffc000000000	ffffffc007ffffff	 128MB		bpf jit region
+  ffffffc008000000	ffffffc00fffffff	 128MB		modules
+  ffffffc010000000	fffffffdefffffff      253440MB		vmalloc
+  fffffffdf0000000	fffffffdfdffffff	 224MB		fixed mappings (top down)
+  fffffffdfe000000	fffffffdfe7fffff	   8MB		[guard region]
+  fffffffdfe800000	fffffffdff7fffff	  16MB		PCI I/O space
+  fffffffdff800000	fffffffdffffffff	   8MB		[guard region]
+  fffffffe00000000	ffffffffefffffff	   4GB		vmemmap
+  ffffffff00000000	ffffffffffffffff	   4GB		[guard region]
+
+
 AArch64 Linux memory layout with 4KB pages + 4 levels (48-bit)::
 
   Start			End			Size		Use
-- 
2.33.0