1125c0d0bSYanteng Si.. SPDX-License-Identifier: GPL-2.0 2125c0d0bSYanteng Si.. include:: ../disclaimer-zh_CN.rst 3125c0d0bSYanteng Si 4125c0d0bSYanteng Si:Original: Documentation/riscv/vm-layout.rst 5125c0d0bSYanteng Si 6125c0d0bSYanteng Si:翻译: 7125c0d0bSYanteng Si 8125c0d0bSYanteng Si 司延腾 Yanteng Si <siyanteng@loongson.cn> 9*f41c74afSBinbin Zhou Binbin Zhou <zhoubinbin@loongson.cn> 10125c0d0bSYanteng Si 11125c0d0bSYanteng Si============================ 12125c0d0bSYanteng SiRISC-V Linux上的虚拟内存布局 13125c0d0bSYanteng Si============================ 14125c0d0bSYanteng Si 15125c0d0bSYanteng Si:作者: Alexandre Ghiti <alex@ghiti.fr> 16125c0d0bSYanteng Si:日期: 12 February 2021 17125c0d0bSYanteng Si 18125c0d0bSYanteng Si这份文件描述了RISC-V Linux内核使用的虚拟内存布局。 19125c0d0bSYanteng Si 20125c0d0bSYanteng Si32位 RISC-V Linux 内核 21125c0d0bSYanteng Si====================== 22125c0d0bSYanteng Si 23125c0d0bSYanteng SiRISC-V Linux Kernel SV32 24125c0d0bSYanteng Si------------------------ 25125c0d0bSYanteng Si 26125c0d0bSYanteng SiTODO 27125c0d0bSYanteng Si 28125c0d0bSYanteng Si64位 RISC-V Linux 内核 29125c0d0bSYanteng Si====================== 30125c0d0bSYanteng Si 31125c0d0bSYanteng SiRISC-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 32125c0d0bSYanteng Si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 33125c0d0bSYanteng Si内核所在的地方。 34125c0d0bSYanteng Si 35125c0d0bSYanteng SiRISC-V Linux Kernel SV39 36125c0d0bSYanteng Si------------------------ 37125c0d0bSYanteng Si 38125c0d0bSYanteng Si:: 39125c0d0bSYanteng Si 40125c0d0bSYanteng Si ======================================================================================================================== 41125c0d0bSYanteng Si 开始地址 | 偏移 | 结束地址 | 大小 | 虚拟内存区域描述 42125c0d0bSYanteng Si ======================================================================================================================== 43125c0d0bSYanteng Si | | | | 44125c0d0bSYanteng Si 0000000000000000 | 0 | 0000003fffffffff | 256 GB | 用户空间虚拟内存，每个内存管理器不同 45125c0d0bSYanteng Si __________________|____________|__________________|_________|___________________________________________________________ 46125c0d0bSYanteng Si | | | | 47125c0d0bSYanteng Si 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 48125c0d0bSYanteng Si | | | | 开始偏移的非经典虚拟内存地址空洞。 49125c0d0bSYanteng Si | | | | 50125c0d0bSYanteng Si __________________|____________|__________________|_________|___________________________________________________________ 51125c0d0bSYanteng Si | 52125c0d0bSYanteng Si | 内核空间的虚拟内存，在所有进程之间共享: 53125c0d0bSYanteng Si ____________________________________________________________|___________________________________________________________ 54125c0d0bSYanteng Si | | | | 55125c0d0bSYanteng Si ffffffc6fee00000 | -228 GB | ffffffc6feffffff | 2 MB | fixmap 56125c0d0bSYanteng Si ffffffc6ff000000 | -228 GB | ffffffc6ffffffff | 16 MB | PCI io 57125c0d0bSYanteng Si ffffffc700000000 | -228 GB | ffffffc7ffffffff | 4 GB | vmemmap 58125c0d0bSYanteng Si ffffffc800000000 | -224 GB | ffffffd7ffffffff | 64 GB | vmalloc/ioremap space 59125c0d0bSYanteng Si ffffffd800000000 | -160 GB | fffffff6ffffffff | 124 GB | 直接映射所有物理内存 60125c0d0bSYanteng Si fffffff700000000 | -36 GB | fffffffeffffffff | 32 GB | kasan 61125c0d0bSYanteng Si __________________|____________|__________________|_________|____________________________________________________________ 62125c0d0bSYanteng Si | 63125c0d0bSYanteng Si | 64125c0d0bSYanteng Si ____________________________________________________________|____________________________________________________________ 65125c0d0bSYanteng Si | | | | 66125c0d0bSYanteng Si ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF 67125c0d0bSYanteng Si ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel 68125c0d0bSYanteng Si __________________|____________|__________________|_________|____________________________________________________________ 69*f41c74afSBinbin Zhou 70*f41c74afSBinbin Zhou 71*f41c74afSBinbin ZhouRISC-V Linux Kernel SV48 72*f41c74afSBinbin Zhou------------------------ 73*f41c74afSBinbin Zhou 74*f41c74afSBinbin Zhou:: 75*f41c74afSBinbin Zhou 76*f41c74afSBinbin Zhou ======================================================================================================================== 77*f41c74afSBinbin Zhou 开始地址 | 偏移 | 结束地址 | 大小 | 虚拟内存区域描述 78*f41c74afSBinbin Zhou ======================================================================================================================== 79*f41c74afSBinbin Zhou | | | | 80*f41c74afSBinbin Zhou 0000000000000000 | 0 | 00007fffffffffff | 128 TB | 用户空间虚拟内存，每个内存管理器不同 81*f41c74afSBinbin Zhou __________________|____________|__________________|_________|___________________________________________________________ 82*f41c74afSBinbin Zhou | | | | 83*f41c74afSBinbin Zhou 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*f41c74afSBinbin Zhou | | | | 开始偏移的非经典虚拟内存地址空洞。 85*f41c74afSBinbin Zhou | | | | 86*f41c74afSBinbin Zhou __________________|____________|__________________|_________|___________________________________________________________ 87*f41c74afSBinbin Zhou | 88*f41c74afSBinbin Zhou | 内核空间的虚拟内存，在所有进程之间共享: 89*f41c74afSBinbin Zhou ____________________________________________________________|___________________________________________________________ 90*f41c74afSBinbin Zhou | | | | 91*f41c74afSBinbin Zhou ffff8d7ffee00000 | -114.5 TB | ffff8d7ffeffffff | 2 MB | fixmap 92*f41c74afSBinbin Zhou ffff8d7fff000000 | -114.5 TB | ffff8d7fffffffff | 16 MB | PCI io 93*f41c74afSBinbin Zhou ffff8d8000000000 | -114.5 TB | ffff8f7fffffffff | 2 TB | vmemmap 94*f41c74afSBinbin Zhou ffff8f8000000000 | -112.5 TB | ffffaf7fffffffff | 32 TB | vmalloc/ioremap space 95*f41c74afSBinbin Zhou ffffaf8000000000 | -80.5 TB | ffffef7fffffffff | 64 TB | 直接映射所有物理内存 96*f41c74afSBinbin Zhou ffffef8000000000 | -16.5 TB | fffffffeffffffff | 16.5 TB | kasan 97*f41c74afSBinbin Zhou __________________|____________|__________________|_________|____________________________________________________________ 98*f41c74afSBinbin Zhou | 99*f41c74afSBinbin Zhou | 从此处开始，与39-bit布局相同： 100*f41c74afSBinbin Zhou ____________________________________________________________|____________________________________________________________ 101*f41c74afSBinbin Zhou | | | | 102*f41c74afSBinbin Zhou ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF 103*f41c74afSBinbin Zhou ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel 104*f41c74afSBinbin Zhou __________________|____________|__________________|_________|____________________________________________________________ 105