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authorLinus Torvalds <torvalds@linux-foundation.org>2015-04-18 11:10:49 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-18 11:10:49 -0400
commitd6a24d0640d609138a4e40a4ce9fd9fe7859e24c (patch)
treeaa40fb7f5d03dc605634fb4030afd8798bd6bc0b /Documentation/zh_CN/arm64/legacy_instructions.txt
parent1f5014d6a77513fa7cefe30eb7791d5856c04384 (diff)
parent197175427a221fe3200f7727ea35e261727e7228 (diff)
Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6
Pull documentation updates from Jonathan Corbet: "Numerous fixes, the overdue removal of the i2o docs, some new Chinese translations, and, hopefully, the README fix that will end the flow of identical patches to that file" * tag 'docs-for-linus' of git://git.lwn.net/linux-2.6: (34 commits) Documentation/memcg: update memcg/kmem status Documentation: blackfin: Makefile: Typo building issue Documentation/vm/pagemap.txt: correct location of page-types tool Documentation/memory-barriers.txt: typo fix doc: Add guest_nice column to example output of `cat /proc/stat' Documentation/kernel-parameters: Move "eagerfpu" to its right place Documentation: gpio: Update ACPI part of the document to mention _DSD docs/completion.txt: Various tweaks and corrections doc: completion: context, scope and language fixes Documentation:Update Documentation/zh_CN/arm64/memory.txt Documentation:Update Documentation/zh_CN/arm64/booting.txt Documentation: Chinese translation of arm64/legacy_instructions.txt DocBook media: fix broken EIA hyperlink Documentation: tweak the maintainers entry README: Change gzip/bzip2 to xz compression format README: Update version number reference doc:pci: Fix typo in Documentation/PCI Documentation: drm: Use '->' when describing access through pointers. Documentation: Remove mentioning of block barriers Documentation/email-clients.txt: Fix one grammar mistake, add extra info about TB ...
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+Chinese translated version of Documentation/arm64/legacy_instructions.txt
+
+If you have any comment or update to the content, please contact the
+original document maintainer directly. However, if you have a problem
+communicating in English you can also ask the Chinese maintainer for
+help. Contact the Chinese maintainer if this translation is outdated
+or if there is a problem with the translation.
+
+Maintainer: Punit Agrawal <punit.agrawal@arm.com>
+ Suzuki K. Poulose <suzuki.poulose@arm.com>
+Chinese maintainer: Fu Wei <wefu@redhat.com>
+---------------------------------------------------------------------
+Documentation/arm64/legacy_instructions.txt 的中文翻译
+
+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
+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
+译存在问题,请联系中文版维护者。
+
+本文翻译提交时的 Git 检出点为: bc465aa9d045feb0e13b4a8f32cc33c1943f62d6
+
+英文版维护者: Punit Agrawal <punit.agrawal@arm.com>
+ Suzuki K. Poulose <suzuki.poulose@arm.com>
+中文版维护者: 傅炜 Fu Wei <wefu@redhat.com>
+中文版翻译者: 傅炜 Fu Wei <wefu@redhat.com>
+中文版校译者: 傅炜 Fu Wei <wefu@redhat.com>
+
+以下为正文
+---------------------------------------------------------------------
+Linux 内核在 arm64 上的移植提供了一个基础框架,以支持构架中正在被淘汰或已废弃指令的模拟执行。
+这个基础框架的代码使用未定义指令钩子(hooks)来支持模拟。如果指令存在,它也允许在硬件中启用该指令。
+
+模拟模式可通过写 sysctl 节点(/proc/sys/abi)来控制。
+不同的执行方式及 sysctl 节点的相应值,解释如下:
+
+* Undef(未定义)
+ 值: 0
+ 产生未定义指令终止异常。它是那些构架中已废弃的指令,如 SWP,的默认处理方式。
+
+* Emulate(模拟)
+ 值: 1
+ 使用软件模拟方式。为解决软件迁移问题,这种模拟指令模式的使用是被跟踪的,并会发出速率限制警告。
+ 它是那些构架中正在被淘汰的指令,如 CP15 barriers(隔离指令),的默认处理方式。
+
+* Hardware Execution(硬件执行)
+ 值: 2
+ 虽然标记为正在被淘汰,但一些实现可能提供硬件执行这些指令的使能/禁用操作。
+ 使用硬件执行一般会有更好的性能,但将无法收集运行时对正被淘汰指令的使用统计数据。
+
+默认执行模式依赖于指令在构架中状态。正在被淘汰的指令应该以模拟(Emulate)作为默认模式,
+而已废弃的指令必须默认使用未定义(Undef)模式
+
+注意:指令模拟可能无法应对所有情况。更多详情请参考单独的指令注释。
+
+受支持的遗留指令
+-------------
+* SWP{B}
+节点: /proc/sys/abi/swp
+状态: 已废弃
+默认执行方式: Undef (0)
+
+* CP15 Barriers
+节点: /proc/sys/abi/cp15_barrier
+状态: 正被淘汰,不推荐使用
+默认执行方式: Emulate (1)
+
+* SETEND
+节点: /proc/sys/abi/setend
+状态: 正被淘汰,不推荐使用
+默认执行方式: Emulate (1)*
+注:为了使能这个特性,系统中的所有 CPU 必须在 EL0 支持混合字节序。
+如果一个新的 CPU (不支持混合字节序) 在使能这个特性后被热插入系统,
+在应用中可能会出现不可预期的结果。