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From: panqinglin2020@iscas.ac.cn
To: paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu, linux-riscv@lists.infradead.org
Cc: jeff@riscv.org, xuyinan@ict.ac.cn,
	Qinglin Pan <panqinglin2020@iscas.ac.cn>
Subject: [PATCH v1 2/2] Documentation, mm: Add Sv57 vm layout documentation
Date: Wed, 24 Nov 2021 19:18:29 +0800	[thread overview]
Message-ID: <20211124111829.788114-3-panqinglin2020@iscas.ac.cn> (raw)
In-Reply-To: <20211124111829.788114-1-panqinglin2020@iscas.ac.cn>

From: Qinglin Pan <panqinglin2020@iscas.ac.cn>

This patch adds descriptions of Sv57 into vm-layout.rst. When using
Sv57, the kernel will use 0xff80000000000000 as PAGE_OFFSET.

Signed-off-by: Qinglin Pan <panqinglin2020@iscas.ac.cn>
---
 Documentation/riscv/vm-layout.rst | 36 +++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/Documentation/riscv/vm-layout.rst b/Documentation/riscv/vm-layout.rst
index f10128e0a95f..5c115355a8f9 100644
--- a/Documentation/riscv/vm-layout.rst
+++ b/Documentation/riscv/vm-layout.rst
@@ -97,3 +97,39 @@ RISC-V Linux Kernel SV48
    ffffffff00000000 |   -4    GB | ffffffff7fffffff |    2 GB | modules, BPF
    ffffffff80000000 |   -2    GB | ffffffffffffffff |    2 GB | kernel
   __________________|____________|__________________|_________|____________________________________________________________
+
+
+RISC-V Linux Kernel SV57
+------------------------
+
+::
+
+  ========================================================================================================================
+        Start addr    |   Offset   |     End addr     |  Size   | VM area description
+  ========================================================================================================================
+                      |            |                  |         |
+     0000000000000000 |    0       | 00ffffffffffffff |  64 PB  | user-space virtual memory, different per mm
+    __________________|____________|__________________|_________|___________________________________________________________
+                      |            |                  |         |
+     0100000000000000 |  +64    PB | feffffffffffffff | ~16M TB | ... huge, almost 64 bits wide hole of non-canonical
+                      |            |                  |         | virtual memory addresses up to the -64 PB
+                      |            |                  |         | starting offset of kernel mappings.
+    __________________|____________|__________________|_________|___________________________________________________________
+                                                                |
+                                                                | Kernel-space virtual memory, shared between all processes:
+    ____________________________________________________________|___________________________________________________________
+                      |            |                  |         |
+     ff00000000000000 |  -64    PB | ff1fffffffffffff |    8 PB | kasan
+     ff3bfffffee00000 |  -49    PB | ff3bfffffeffffff |    2 MB | fixmap
+     ff3bffffff000000 |  -49    PB | ff3bffffffffffff |   16 MB | PCI io
+     ff3c000000000000 |  -49    PB | ff3fffffffffffff |    1 PB | vmemmap
+     ff40000000000000 |  -48    PB | ff7fffffffffffff |   16 PB | vmalloc/ioremap space
+     ff80000000000000 |  -32    PB | fffffffeffffffff |   32 PB | direct mapping of all physical memory
+    __________________|____________|__________________|_________|____________________________________________________________
+                                                                |
+                                                                | Identical layout to the 39-bit one from here on:
+    ____________________________________________________________|____________________________________________________________
+                      |            |                  |         |
+     ffffffff00000000 |   -4    GB | ffffffff7fffffff |    2 GB | modules, BPF
+     ffffffff80000000 |   -2    GB | ffffffffffffffff |    2 GB | kernel
+    __________________|____________|__________________|_________|____________________________________________________________
-- 
2.32.0


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  parent reply	other threads:[~2021-11-24 11:19 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-24 11:18 [PATCH v1 0/2] Add Sv57 page table support panqinglin2020
2021-11-24 11:18 ` [PATCH v1 1/2] riscv, mm: Add Sv57 support based on Sv48 implementation panqinglin2020
2021-11-24 11:18 ` panqinglin2020 [this message]
2021-11-24 11:20 [RESEND PATCH v1 0/2] Add Sv57 page table support panqinglin2020
2021-11-24 11:20 ` [PATCH v1 2/2] Documentation, mm: Add Sv57 vm layout documentation panqinglin2020

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