Documentation:Chinese translation of Documentation/arm64/memory.txt
This is a Chinese translated version of Documentation/arm64/memory.txt Signed-off-by: Fu Wei <tekkamanninja@gmail.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Documentation/zh_CN/arm64/memory.txt
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Chinese translated version of Documentation/arm64/memory.txt
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If you have any comment or update to the content, please contact the
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original document maintainer directly. However, if you have a problem
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communicating in English you can also ask the Chinese maintainer for
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help. Contact the Chinese maintainer if this translation is outdated
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or if there is a problem with the translation.
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Maintainer: Catalin Marinas <catalin.marinas@arm.com>
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Chinese maintainer: Fu Wei <tekkamanninja@gmail.com>
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---------------------------------------------------------------------
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Documentation/arm64/memory.txt 的中文翻译
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如果想评论或更新本文的内容,请直接联系原文档的维护者。如果你使用英文
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交流有困难的话,也可以向中文版维护者求助。如果本翻译更新不及时或者翻
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译存在问题,请联系中文版维护者。
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英文版维护者: Catalin Marinas <catalin.marinas@arm.com>
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中文版维护者: 傅炜 Fu Wei <tekkamanninja@gmail.com>
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中文版翻译者: 傅炜 Fu Wei <tekkamanninja@gmail.com>
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中文版校译者: 傅炜 Fu Wei <tekkamanninja@gmail.com>
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以下为正文
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---------------------------------------------------------------------
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Linux 在 AArch64 中的内存布局
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===========================
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作者: Catalin Marinas <catalin.marinas@arm.com>
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日期: 2012 年 02 月 20 日
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本文档描述 AArch64 Linux 内核所使用的虚拟内存布局。此构架可以实现
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页大小为 4KB 的 4 级转换表和页大小为 64KB 的 3 级转换表。
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AArch64 Linux 使用页大小为 4KB 的 3 级转换表配置,对于用户和内核
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都有 39-bit (512GB) 的虚拟地址空间。对于页大小为 64KB的配置,仅
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使用 2 级转换表,但内存布局相同。
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用户地址空间的 63:39 位为 0,而内核地址空间的相应位为 1。TTBRx 的
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选择由虚拟地址的 63 位给出。swapper_pg_dir 仅包含内核(全局)映射,
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而用户 pgd 仅包含用户(非全局)映射。swapper_pgd_dir 地址被写入
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TTBR1 中,且从不写入 TTBR0。
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AArch64 Linux 内存布局:
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起始地址 结束地址 大小 用途
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-----------------------------------------------------------------------
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0000000000000000 0000007fffffffff 512GB 用户空间
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ffffff8000000000 ffffffbbfffcffff ~240GB vmalloc
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ffffffbbfffd0000 ffffffbcfffdffff 64KB [防护页]
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ffffffbbfffe0000 ffffffbcfffeffff 64KB PCI I/O 空间
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ffffffbbffff0000 ffffffbcffffffff 64KB [防护页]
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ffffffbc00000000 ffffffbdffffffff 8GB vmemmap
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ffffffbe00000000 ffffffbffbffffff ~8GB [防护页,未来用于 vmmemap]
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ffffffbffc000000 ffffffbfffffffff 64MB 模块
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ffffffc000000000 ffffffffffffffff 256GB 内存空间
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4KB 页大小的转换表查找:
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+--------+--------+--------+--------+--------+--------+--------+--------+
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|63 56|55 48|47 40|39 32|31 24|23 16|15 8|7 0|
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+--------+--------+--------+--------+--------+--------+--------+--------+
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| | | | | |
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| | | | | v
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| | | | | [11:0] 页内偏移
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| | | | +-> [20:12] L3 索引
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| | | +-----------> [29:21] L2 索引
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| | +---------------------> [38:30] L1 索引
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| +-------------------------------> [47:39] L0 索引 (未使用)
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+-------------------------------------------------> [63] TTBR0/1
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64KB 页大小的转换表查找:
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+--------+--------+--------+--------+--------+--------+--------+--------+
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|63 56|55 48|47 40|39 32|31 24|23 16|15 8|7 0|
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+--------+--------+--------+--------+--------+--------+--------+--------+
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| | | | |
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| | | | v
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| | | | [15:0] 页内偏移
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| | | +----------> [28:16] L3 索引
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| | +--------------------------> [41:29] L2 索引 (仅使用 38:29 )
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| +-------------------------------> [47:42] L1 索引 (未使用)
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+-------------------------------------------------> [63] TTBR0/1
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