1*ed843ae9SCosta Shulyupin.. SPDX-License-Identifier: GPL-2.0 2*ed843ae9SCosta Shulyupin.. include:: ../../disclaimer-zh_CN.rst 3*ed843ae9SCosta Shulyupin 4*ed843ae9SCosta Shulyupin:Original: Documentation/arch/riscv/vm-layout.rst 5*ed843ae9SCosta Shulyupin 6*ed843ae9SCosta Shulyupin:翻译: 7*ed843ae9SCosta Shulyupin 8*ed843ae9SCosta Shulyupin 司延腾 Yanteng Si <siyanteng@loongson.cn> 9*ed843ae9SCosta Shulyupin Binbin Zhou <zhoubinbin@loongson.cn> 10*ed843ae9SCosta Shulyupin 11*ed843ae9SCosta Shulyupin============================ 12*ed843ae9SCosta ShulyupinRISC-V Linux上的虚拟内存布局 13*ed843ae9SCosta Shulyupin============================ 14*ed843ae9SCosta Shulyupin 15*ed843ae9SCosta Shulyupin:作者: Alexandre Ghiti <alex@ghiti.fr> 16*ed843ae9SCosta Shulyupin:日期: 12 February 2021 17*ed843ae9SCosta Shulyupin 18*ed843ae9SCosta Shulyupin这份文件描述了RISC-V Linux内核使用的虚拟内存布局。 19*ed843ae9SCosta Shulyupin 20*ed843ae9SCosta Shulyupin32位 RISC-V Linux 内核 21*ed843ae9SCosta Shulyupin====================== 22*ed843ae9SCosta Shulyupin 23*ed843ae9SCosta ShulyupinRISC-V Linux Kernel SV32 24*ed843ae9SCosta Shulyupin------------------------ 25*ed843ae9SCosta Shulyupin 26*ed843ae9SCosta ShulyupinTODO 27*ed843ae9SCosta Shulyupin 28*ed843ae9SCosta Shulyupin64位 RISC-V Linux 内核 29*ed843ae9SCosta Shulyupin====================== 30*ed843ae9SCosta Shulyupin 31*ed843ae9SCosta ShulyupinRISC-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*ed843ae9SCosta Shulyupin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 33*ed843ae9SCosta Shulyupin内核所在的地方。 34*ed843ae9SCosta Shulyupin 35*ed843ae9SCosta ShulyupinRISC-V Linux Kernel SV39 36*ed843ae9SCosta Shulyupin------------------------ 37*ed843ae9SCosta Shulyupin 38*ed843ae9SCosta Shulyupin:: 39*ed843ae9SCosta Shulyupin 40*ed843ae9SCosta Shulyupin ======================================================================================================================== 41*ed843ae9SCosta Shulyupin 开始地址 | 偏移 | 结束地址 | 大小 | 虚拟内存区域描述 42*ed843ae9SCosta Shulyupin ======================================================================================================================== 43*ed843ae9SCosta Shulyupin | | | | 44*ed843ae9SCosta Shulyupin 0000000000000000 | 0 | 0000003fffffffff | 256 GB | 用户空间虚拟内存，每个内存管理器不同 45*ed843ae9SCosta Shulyupin __________________|____________|__________________|_________|___________________________________________________________ 46*ed843ae9SCosta Shulyupin | | | | 47*ed843ae9SCosta Shulyupin 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*ed843ae9SCosta Shulyupin | | | | 开始偏移的非经典虚拟内存地址空洞。 49*ed843ae9SCosta Shulyupin | | | | 50*ed843ae9SCosta Shulyupin __________________|____________|__________________|_________|___________________________________________________________ 51*ed843ae9SCosta Shulyupin | 52*ed843ae9SCosta Shulyupin | 内核空间的虚拟内存，在所有进程之间共享: 53*ed843ae9SCosta Shulyupin ____________________________________________________________|___________________________________________________________ 54*ed843ae9SCosta Shulyupin | | | | 55*ed843ae9SCosta Shulyupin ffffffc6fee00000 | -228 GB | ffffffc6feffffff | 2 MB | fixmap 56*ed843ae9SCosta Shulyupin ffffffc6ff000000 | -228 GB | ffffffc6ffffffff | 16 MB | PCI io 57*ed843ae9SCosta Shulyupin ffffffc700000000 | -228 GB | ffffffc7ffffffff | 4 GB | vmemmap 58*ed843ae9SCosta Shulyupin ffffffc800000000 | -224 GB | ffffffd7ffffffff | 64 GB | vmalloc/ioremap space 59*ed843ae9SCosta Shulyupin ffffffd800000000 | -160 GB | fffffff6ffffffff | 124 GB | 直接映射所有物理内存 60*ed843ae9SCosta Shulyupin fffffff700000000 | -36 GB | fffffffeffffffff | 32 GB | kasan 61*ed843ae9SCosta Shulyupin __________________|____________|__________________|_________|____________________________________________________________ 62*ed843ae9SCosta Shulyupin | 63*ed843ae9SCosta Shulyupin | 64*ed843ae9SCosta Shulyupin ____________________________________________________________|____________________________________________________________ 65*ed843ae9SCosta Shulyupin | | | | 66*ed843ae9SCosta Shulyupin ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF 67*ed843ae9SCosta Shulyupin ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel 68*ed843ae9SCosta Shulyupin __________________|____________|__________________|_________|____________________________________________________________ 69*ed843ae9SCosta Shulyupin 70*ed843ae9SCosta Shulyupin 71*ed843ae9SCosta ShulyupinRISC-V Linux Kernel SV48 72*ed843ae9SCosta Shulyupin------------------------ 73*ed843ae9SCosta Shulyupin 74*ed843ae9SCosta Shulyupin:: 75*ed843ae9SCosta Shulyupin 76*ed843ae9SCosta Shulyupin ======================================================================================================================== 77*ed843ae9SCosta Shulyupin 开始地址 | 偏移 | 结束地址 | 大小 | 虚拟内存区域描述 78*ed843ae9SCosta Shulyupin ======================================================================================================================== 79*ed843ae9SCosta Shulyupin | | | | 80*ed843ae9SCosta Shulyupin 0000000000000000 | 0 | 00007fffffffffff | 128 TB | 用户空间虚拟内存，每个内存管理器不同 81*ed843ae9SCosta Shulyupin __________________|____________|__________________|_________|___________________________________________________________ 82*ed843ae9SCosta Shulyupin | | | | 83*ed843ae9SCosta Shulyupin 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*ed843ae9SCosta Shulyupin | | | | 开始偏移的非经典虚拟内存地址空洞。 85*ed843ae9SCosta Shulyupin | | | | 86*ed843ae9SCosta Shulyupin __________________|____________|__________________|_________|___________________________________________________________ 87*ed843ae9SCosta Shulyupin | 88*ed843ae9SCosta Shulyupin | 内核空间的虚拟内存，在所有进程之间共享: 89*ed843ae9SCosta Shulyupin ____________________________________________________________|___________________________________________________________ 90*ed843ae9SCosta Shulyupin | | | | 91*ed843ae9SCosta Shulyupin ffff8d7ffee00000 | -114.5 TB | ffff8d7ffeffffff | 2 MB | fixmap 92*ed843ae9SCosta Shulyupin ffff8d7fff000000 | -114.5 TB | ffff8d7fffffffff | 16 MB | PCI io 93*ed843ae9SCosta Shulyupin ffff8d8000000000 | -114.5 TB | ffff8f7fffffffff | 2 TB | vmemmap 94*ed843ae9SCosta Shulyupin ffff8f8000000000 | -112.5 TB | ffffaf7fffffffff | 32 TB | vmalloc/ioremap space 95*ed843ae9SCosta Shulyupin ffffaf8000000000 | -80.5 TB | ffffef7fffffffff | 64 TB | 直接映射所有物理内存 96*ed843ae9SCosta Shulyupin ffffef8000000000 | -16.5 TB | fffffffeffffffff | 16.5 TB | kasan 97*ed843ae9SCosta Shulyupin __________________|____________|__________________|_________|____________________________________________________________ 98*ed843ae9SCosta Shulyupin | 99*ed843ae9SCosta Shulyupin | 从此处开始，与39-bit布局相同： 100*ed843ae9SCosta Shulyupin ____________________________________________________________|____________________________________________________________ 101*ed843ae9SCosta Shulyupin | | | | 102*ed843ae9SCosta Shulyupin ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF 103*ed843ae9SCosta Shulyupin ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel 104*ed843ae9SCosta Shulyupin __________________|____________|__________________|_________|____________________________________________________________ 105