.. SPDX-License-Identifier: GPL-2.0 .. include:: ../disclaimer-zh_CN.rst :Original: Documentation/riscv/vm-layout.rst :翻译: å¸å»¶è…¾ Yanteng Si <siyanteng@loongson.cn> Binbin Zhou <zhoubinbin@loongson.cn> ============================ RISC-V Linux上的虚拟内å˜å¸ƒå±€ ============================ :作者: Alexandre Ghiti <alex@ghiti.fr> :日期: 12 February 2021 这份文件æ述了RISC-V Linuxå†…æ ¸ä½¿ç”¨çš„è™šæ‹Ÿå†…å˜å¸ƒå±€ã€‚ 32ä½ RISC-V Linux å†…æ ¸ ====================== RISC-V Linux Kernel SV32 ------------------------ TODO 64ä½ RISC-V Linux å†…æ ¸ ====================== RISC-V特æƒæž¶æž„文档指出,64ä½åœ°å€ "必须使第63-48ä½å€¼éƒ½ç‰äºŽç¬¬47ä½ï¼Œå¦åˆ™å°†å‘生缺页异常。":这将虚 拟地å€ç©ºé—´åˆ†æˆä¸¤åŠï¼Œä¸é—´æœ‰ä¸€ä¸ªéžå¸¸å¤§çš„洞,下åŠéƒ¨åˆ†æ˜¯ç”¨æˆ·ç©ºé—´æ‰€åœ¨çš„地方,上åŠéƒ¨åˆ†æ˜¯RISC-V Linux å†…æ ¸æ‰€åœ¨çš„åœ°æ–¹ã€‚ RISC-V Linux Kernel SV39 ------------------------ :: ======================================================================================================================== å¼€å§‹åœ°å€ | å移 | 结æŸåœ°å€ | å¤§å° | 虚拟内å˜åŒºåŸŸæè¿° ======================================================================================================================== | | | | 0000000000000000 | 0 | 0000003fffffffff | 256 GB | 用户空间虚拟内å˜ï¼Œæ¯ä¸ªå†…å˜ç®¡ç†å™¨ä¸åŒ __________________|____________|__________________|_________|___________________________________________________________ | | | | 0000004000000000 | +256 GB | ffffffbfffffffff | ~16M TB | ... 巨大的ã€å‡ 乎64ä½å®½çš„ç›´åˆ°å†…æ ¸æ˜ å°„çš„-256GB地方 | | | | 开始å移的éžç»å…¸è™šæ‹Ÿå†…å˜åœ°å€ç©ºæ´žã€‚ | | | | __________________|____________|__________________|_________|___________________________________________________________ | | å†…æ ¸ç©ºé—´çš„è™šæ‹Ÿå†…å˜ï¼Œåœ¨æ‰€æœ‰è¿›ç¨‹ä¹‹é—´å…±äº«: ____________________________________________________________|___________________________________________________________ | | | | 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 | ç›´æŽ¥æ˜ å°„æ‰€æœ‰ç‰©ç†å†…å˜ fffffff700000000 | -36 GB | fffffffeffffffff | 32 GB | kasan __________________|____________|__________________|_________|____________________________________________________________ | | ____________________________________________________________|____________________________________________________________ | | | | ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel __________________|____________|__________________|_________|____________________________________________________________ RISC-V Linux Kernel SV48 ------------------------ :: ======================================================================================================================== å¼€å§‹åœ°å€ | å移 | 结æŸåœ°å€ | å¤§å° | 虚拟内å˜åŒºåŸŸæè¿° ======================================================================================================================== | | | | 0000000000000000 | 0 | 00007fffffffffff | 128 TB | 用户空间虚拟内å˜ï¼Œæ¯ä¸ªå†…å˜ç®¡ç†å™¨ä¸åŒ __________________|____________|__________________|_________|___________________________________________________________ | | | | 0000800000000000 | +128 TB | ffff7fffffffffff | ~16M TB | ... 巨大的ã€å‡ 乎64ä½å®½çš„ç›´åˆ°å†…æ ¸æ˜ å°„çš„-128TB地方 | | | | 开始å移的éžç»å…¸è™šæ‹Ÿå†…å˜åœ°å€ç©ºæ´žã€‚ | | | | __________________|____________|__________________|_________|___________________________________________________________ | | å†…æ ¸ç©ºé—´çš„è™šæ‹Ÿå†…å˜ï¼Œåœ¨æ‰€æœ‰è¿›ç¨‹ä¹‹é—´å…±äº«: ____________________________________________________________|___________________________________________________________ | | | | ffff8d7ffee00000 | -114.5 TB | ffff8d7ffeffffff | 2 MB | fixmap ffff8d7fff000000 | -114.5 TB | ffff8d7fffffffff | 16 MB | PCI io ffff8d8000000000 | -114.5 TB | ffff8f7fffffffff | 2 TB | vmemmap ffff8f8000000000 | -112.5 TB | ffffaf7fffffffff | 32 TB | vmalloc/ioremap space ffffaf8000000000 | -80.5 TB | ffffef7fffffffff | 64 TB | ç›´æŽ¥æ˜ å°„æ‰€æœ‰ç‰©ç†å†…å˜ ffffef8000000000 | -16.5 TB | fffffffeffffffff | 16.5 TB | kasan __________________|____________|__________________|_________|____________________________________________________________ | | 从æ¤å¤„开始,与39-bit布局相åŒï¼š ____________________________________________________________|____________________________________________________________ | | | | ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel __________________|____________|__________________|_________|____________________________________________________________