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1.. SPDX-License-Identifier: GPL-2.02.. include:: ../../disclaimer-zh_CN.rst3 4:Original: Documentation/arch/riscv/vm-layout.rst5 6:翻译:7 8 司延腾 Yanteng Si <siyanteng@loongson.cn>9 Binbin Zhou <zhoubinbin@loongson.cn>10 11============================12RISC-V Linux上的虚拟内存布局13============================14 15:作者: Alexandre Ghiti <alex@ghiti.fr>16:日期: 12 February 202117 18这份文件描述了RISC-V Linux内核使用的虚拟内存布局。19 2032位 RISC-V Linux 内核21======================22 23RISC-V Linux Kernel SV3224------------------------25 26TODO27 2864位 RISC-V Linux 内核29======================30 31RISC-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32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 Linux33内核所在的地方。34 35RISC-V Linux Kernel SV3936------------------------37 38::39 40 ========================================================================================================================41 开始地址 | 偏移 | 结束地址 | 大小 | 虚拟内存区域描述42 ========================================================================================================================43 | | | |44 0000000000000000 | 0 | 0000003fffffffff | 256 GB | 用户空间虚拟内存，每个内存管理器不同45 __________________|____________|__________________|_________|___________________________________________________________46 | | | |47 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48 | | | | 开始偏移的非经典虚拟内存地址空洞。49 | | | |50 __________________|____________|__________________|_________|___________________________________________________________51 |52 | 内核空间的虚拟内存，在所有进程之间共享:53 ____________________________________________________________|___________________________________________________________54 | | | |55 ffffffc6fee00000 | -228 GB | ffffffc6feffffff | 2 MB | fixmap56 ffffffc6ff000000 | -228 GB | ffffffc6ffffffff | 16 MB | PCI io57 ffffffc700000000 | -228 GB | ffffffc7ffffffff | 4 GB | vmemmap58 ffffffc800000000 | -224 GB | ffffffd7ffffffff | 64 GB | vmalloc/ioremap space59 ffffffd800000000 | -160 GB | fffffff6ffffffff | 124 GB | 直接映射所有物理内存60 fffffff700000000 | -36 GB | fffffffeffffffff | 32 GB | kasan61 __________________|____________|__________________|_________|____________________________________________________________62 |63 |64 ____________________________________________________________|____________________________________________________________65 | | | |66 ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF67 ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel68 __________________|____________|__________________|_________|____________________________________________________________69 70 71RISC-V Linux Kernel SV4872------------------------73 74::75 76 ========================================================================================================================77 开始地址 | 偏移 | 结束地址 | 大小 | 虚拟内存区域描述78 ========================================================================================================================79 | | | |80 0000000000000000 | 0 | 00007fffffffffff | 128 TB | 用户空间虚拟内存，每个内存管理器不同81 __________________|____________|__________________|_________|___________________________________________________________82 | | | |83 0000800000000000 | +128 TB | ffff7fffffffffff | ~16M TB | ... 巨大的、几乎64位宽的直到内核映射的-128TB地方84 | | | | 开始偏移的非经典虚拟内存地址空洞。85 | | | |86 __________________|____________|__________________|_________|___________________________________________________________87 |88 | 内核空间的虚拟内存，在所有进程之间共享:89 ____________________________________________________________|___________________________________________________________90 | | | |91 ffff8d7ffee00000 | -114.5 TB | ffff8d7ffeffffff | 2 MB | fixmap92 ffff8d7fff000000 | -114.5 TB | ffff8d7fffffffff | 16 MB | PCI io93 ffff8d8000000000 | -114.5 TB | ffff8f7fffffffff | 2 TB | vmemmap94 ffff8f8000000000 | -112.5 TB | ffffaf7fffffffff | 32 TB | vmalloc/ioremap space95 ffffaf8000000000 | -80.5 TB | ffffef7fffffffff | 64 TB | 直接映射所有物理内存96 ffffef8000000000 | -16.5 TB | fffffffeffffffff | 16.5 TB | kasan97 __________________|____________|__________________|_________|____________________________________________________________98 |99 | 从此处开始，与39-bit布局相同：100 ____________________________________________________________|____________________________________________________________101 | | | |102 ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF103 ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel104 __________________|____________|__________________|_________|____________________________________________________________105