Commit 125c0d0b authored by Yanteng Si's avatar Yanteng Si Committed by Jonathan Corbet
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docs/zh_CN: add riscv vm-layout translation 



Translate .../riscv/vm-layout.rst into Chinese.

Signed-off-by: default avatarYanteng Si <siyanteng@loongson.cn>
Reviewed-by: default avatarAlex Shi <alexs@kernel.org>
Link: https://lore.kernel.org/r/b59965f7f88ea22ec824dc2e92561b018fd370d1.1646108017.git.siyanteng@loongson.cn


Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent f09f6f9b

Documentation/translations/zh_CN/riscv/index.rst

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@@ -18,6 +18,7 @@ RISC-V 体系结构 
    :maxdepth: 1



    boot-image-header

    vm-layout

    pmu

    patch-acceptance

Documentation/translations/zh_CN/riscv/vm-layout.rst

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.. SPDX-License-Identifier: GPL-2.0

.. include:: ../disclaimer-zh_CN.rst



:Original: Documentation/riscv/vm-layout.rst



:翻译:



 司延腾 Yanteng Si <siyanteng@loongson.cn>



============================

RISC-V Linux上的虚拟内存布局

============================



:作者: Alexandre Ghiti <alex@ghiti.fr>

:日期: 12 February 2021



这份文件描述了RISC-V Linux内核使用的虚拟内存布局。



32位 RISC-V Linux 内核

======================



RISC-V Linux Kernel SV32

------------------------



TODO



64位 RISC-V Linux 内核

======================



RISC-V特权架构文档指出，64位地址 "必须使第63-48位值都等于第47位，否则将发生缺页异常。"：这将虚

拟地址空间分成两半，中间有一个非常大的洞，下半部分是用户空间所在的地方，上半部分是RISC-V Linux

内核所在的地方。



RISC-V Linux Kernel SV39

------------------------



::



  ========================================================================================================================

      开始地址       |   偏移      |     结束地址      |  大小    | 虚拟内存区域描述

  ========================================================================================================================

                    |            |                  |         |

   0000000000000000 |    0       | 0000003fffffffff |  256 GB | 用户空间虚拟内存，每个内存管理器不同

  __________________|____________|__________________|_________|___________________________________________________________

                    |            |                  |         |

   0000004000000000 | +256    GB | ffffffbfffffffff | ~16M TB | ... 巨大的、几乎64位宽的直到内核映射的-256GB地方

                    |            |                  |         |     开始偏移的非经典虚拟内存地址空洞。

                    |            |                  |         |

  __________________|____________|__________________|_________|___________________________________________________________

                                                              |

                                                              | 内核空间的虚拟内存，在所有进程之间共享:

  ____________________________________________________________|___________________________________________________________

                    |            |                  |         |

   ffffffc6fee00000 | -228    GB | ffffffc6feffffff |    2 MB | fixmap

   ffffffc6ff000000 | -228    GB | ffffffc6ffffffff |   16 MB | PCI io

   ffffffc700000000 | -228    GB | ffffffc7ffffffff |    4 GB | vmemmap

   ffffffc800000000 | -224    GB | ffffffd7ffffffff |   64 GB | vmalloc/ioremap space

   ffffffd800000000 | -160    GB | fffffff6ffffffff |  124 GB | 直接映射所有物理内存

   fffffff700000000 |  -36    GB | fffffffeffffffff |   32 GB | kasan

  __________________|____________|__________________|_________|____________________________________________________________

                                                              |

                                                              |

  ____________________________________________________________|____________________________________________________________

                    |            |                  |         |

   ffffffff00000000 |   -4    GB | ffffffff7fffffff |    2 GB | modules, BPF

   ffffffff80000000 |   -2    GB | ffffffffffffffff |    2 GB | kernel

  __________________|____________|__________________|_________|____________________________________________________________