68 lines
3.5 KiB
ReStructuredText
68 lines
3.5 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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.. include:: ../disclaimer-zh_CN.rst
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:Original: Documentation/riscv/vm-layout.rst
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:翻译:
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司延腾 Yanteng Si <siyanteng@loongson.cn>
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============================
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RISC-V Linux上的虚拟内存布局
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============================
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:作者: Alexandre Ghiti <alex@ghiti.fr>
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:日期: 12 February 2021
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这份文件描述了RISC-V Linux内核使用的虚拟内存布局。
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32位 RISC-V Linux 内核
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======================
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RISC-V Linux Kernel SV32
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------------------------
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TODO
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64位 RISC-V Linux 内核
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======================
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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
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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
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内核所在的地方。
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RISC-V Linux Kernel SV39
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------------------------
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::
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========================================================================================================================
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开始地址 | 偏移 | 结束地址 | 大小 | 虚拟内存区域描述
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========================================================================================================================
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0000000000000000 | 0 | 0000003fffffffff | 256 GB | 用户空间虚拟内存，每个内存管理器不同
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__________________|____________|__________________|_________|___________________________________________________________
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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
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| | | | 开始偏移的非经典虚拟内存地址空洞。
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__________________|____________|__________________|_________|___________________________________________________________
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| 内核空间的虚拟内存，在所有进程之间共享:
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____________________________________________________________|___________________________________________________________
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ffffffc6fee00000 | -228 GB | ffffffc6feffffff | 2 MB | fixmap
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ffffffc6ff000000 | -228 GB | ffffffc6ffffffff | 16 MB | PCI io
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ffffffc700000000 | -228 GB | ffffffc7ffffffff | 4 GB | vmemmap
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ffffffc800000000 | -224 GB | ffffffd7ffffffff | 64 GB | vmalloc/ioremap space
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ffffffd800000000 | -160 GB | fffffff6ffffffff | 124 GB | 直接映射所有物理内存
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fffffff700000000 | -36 GB | fffffffeffffffff | 32 GB | kasan
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__________________|____________|__________________|_________|____________________________________________________________
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____________________________________________________________|____________________________________________________________
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ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF
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ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel
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__________________|____________|__________________|_________|____________________________________________________________
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