| .. 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 |
| __________________|____________|__________________|_________|____________________________________________________________ |
