Linux内核0.11

最新推荐文章于 2025-12-09 00:02:40 发布

原创最新推荐文章于 2025-12-09 00:02:40 发布 · 109 阅读

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04.操作系统专栏收录该内容

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该博客主要介绍了Linux系统从开机加电到执行main函数前的过程，还包括设备环境初始化、激活进程0，以及进程1和进程2的创建与执行等关键信息。

第1章从开机加电到执行main函数之前的过程

第2章设备环境初始化及激活进程0

第3章进程1的创建及执行

第4章进程2的创建及执行

2 条评论

wliulin 2023.10.05
作者：liheng gong 链接：https://www.zhihu.com/question/26825537/answer/34544526 来源：知乎著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。 Why map both the user process and kernel into virtual memory at the same time? Why not map in the user process when in user-space and map the kernel when in kernel-space? One reason: Performance. Swapping the virtual address space incurs a nontrivial cost. Worse, depending on the system, various caches must be flushed. For example, on x86, the TLB, which caches virtual to physical address translations, must be flushed whenever the virtual mappings change. On systems with virtually-tagged caches, such as older ARM architectures, the entirety of the data and instruction cache must be flushed whenever you context switch! Cache performance is everything on modern systems, so avoiding such flushes is of paramount importance.Consequently, by mapping both the kernel and user address spaces into memory at the same time, context switching into the kernel becomes relatively cheap,

wliulin 2023.10.05
作者：liheng gong 链接：https://www.zhihu.com/question/26825537/answer/34544526 来源：知乎著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。 Why map both the user process and kernel into virtual memory at the same time? Why not map in the user process when in user-space and map the kernel when in kernel-space? One reason: Performance. Swapping the virtual address space incurs a nontrivial cost. Worse, depending on the system, various caches must be flushed. For example, on x86, the TLB, which caches virtual to physical address translations, must be flushed whenever the virtual mappings change. On systems with virtually-tagged caches, such as older ARM architectures, the entirety of the data and instruction cache must be flushed whenever you context switch! Cache performance is everything on modern systems, so avoiding such flushes is of paramount importance.Consequently, by mapping both the kernel and user address spaces into memory at the same time, context switching into the kernel becomes relatively cheap,

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