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xinqiu
2016-06-16 22:33:59 +08:00
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Initialization/linux-initialization-3.md
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@@ -4,7 +4,7 @@ Kernel initialization. Part 3.
Last preparations before the kernel entry point
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This is the third part of the Linux kernel initialization process series. In the previous [part](https://github.com/0xAX/linux-insides/blob/master/Initialization/linux-initialization-2.md) we saw early interrupt and exception handling and will continue to dive into the linux kernel initialization process in the current part. Our next point is 'kernel entry point' - `start_kernel` function from the [init/main.c](https://github.com/torvalds/linux/blob/master/init/main.c) source code file. Yes, technically it is not kernel's entry point but the start of the generic kernel code which does not depend on certain architecture. But before we call the `start_kernel` function, we must do some preparations. So let's continue.
This is the third part of the Linux kernel initialization process series. In the previous [part](https://github.com/MintCN/linux-insides-zh/blob/master/Initialization/linux-initialization-2.md) we saw early interrupt and exception handling and will continue to dive into the linux kernel initialization process in the current part. Our next point is 'kernel entry point' - `start_kernel` function from the [init/main.c](https://github.com/torvalds/linux/blob/master/init/main.c) source code file. Yes, technically it is not kernel's entry point but the start of the generic kernel code which does not depend on certain architecture. But before we call the `start_kernel` function, we must do some preparations. So let's continue.
boot_params again
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@@ -76,7 +76,7 @@ After microcode was loaded we can see the check of the `console_loglevel` and th
Move on init pages
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In the next step, as we have copied `boot_params` structure, we need to move from the early page tables to the page tables for initialization process. We already set early page tables for switchover, you can read about it in the previous [part](http://0xax.gitbooks.io/linux-insides/content/Initialization/linux-initialization-1.html) and dropped all it in the `reset_early_page_tables` function (you can read about it in the previous part too) and kept only kernel high mapping. After this we call:
In the next step, as we have copied `boot_params` structure, we need to move from the early page tables to the page tables for initialization process. We already set early page tables for switchover, you can read about it in the previous [part](http://xinqiu.gitbooks.io/linux-insides-cn/content/Initialization/linux-initialization-1.html) and dropped all it in the `reset_early_page_tables` function (you can read about it in the previous part too) and kept only kernel high mapping. After this we call:
```C
clear_page(init_level4_pgt);
@@ -420,11 +420,11 @@ It is the end of the third part about linux kernel insides. In next part we will
If you have any questions or suggestions write me a comment or ping me at [twitter](https://twitter.com/0xAX).
**Please note that English is not my first language, And I am really sorry for any inconvenience. If you find any mistakes please send me PR to [linux-insides](https://github.com/0xAX/linux-insides).**
**Please note that English is not my first language, And I am really sorry for any inconvenience. If you find any mistakes please send me PR to [linux-insides](https://github.com/MintCN/linux-insides-zh).**
Links
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* [BIOS data area](http://stanislavs.org/helppc/bios_data_area.html)
* [What is in the extended BIOS data area on a PC?](http://www.kryslix.com/nsfaq/Q.6.html)
* [Previous part](https://github.com/0xAX/linux-insides/blob/master/Initialization/linux-initialization-2.md)
* [Previous part](https://github.com/MintCN/linux-insides-zh/blob/master/Initialization/linux-initialization-2.md)