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Merge pull request #240 from simar7/patch-2

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Update linux-initialization-1.md
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0xAX 2015-10-10 23:33:13 +06:00
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Initialization/linux-initialization-1.md
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@ -122,7 +122,7 @@ The first step before we started to setup identity paging, need to correct follo
addq %rbp, level2_fixmap_pgt + (506*8)(%rip) addq %rbp, level2_fixmap_pgt + (506*8)(%rip)
``` ```
Here we need to correct `early_level4_pgt` and other addresses of the page table directories, because as I wrote above, kernel can't be run at the default `0x1000000` address. `rbp` register contains actual address so we add to the `early_level4_pgt`, `level3_kernel_pgt` and `level2_fixmap_pgt`. Let's try to understand what these labels means. First of all let's look on their definition: Here we need to correct `early_level4_pgt` and other addresses of the page table directories, because as I wrote above, kernel can't be run at the default `0x1000000` address. `rbp` register contains actual address so we add to the `early_level4_pgt`, `level3_kernel_pgt` and `level2_fixmap_pgt`. Let's try to understand what these labels mean. First of all let's look on their definition:
```assembly ```assembly
NEXT_PAGE(early_level4_pgt) NEXT_PAGE(early_level4_pgt)
@ -398,7 +398,7 @@ As we loaded new Global Descriptor Table, we reload segments as we did it every
movl %eax,%gs movl %eax,%gs
``` ```
After all of these steps we set up `gs` register that it post to the `irqstack` (we will see information about it in the next parts): After all of these steps we set up `gs` register that it post to the `irqstack` (we will see information about it in the upcoming parts):
```assembly ```assembly
movl $MSR_GS_BASE,%ecx movl $MSR_GS_BASE,%ecx
@ -508,7 +508,7 @@ This is the end of the first part about linux kernel initialization.
If you have questions or suggestions, feel free to ping me in twitter [0xAX](https://twitter.com/0xAX), drop me [email](anotherworldofworld@gmail.com) or just create [issue](https://github.com/0xAX/linux-internals/issues/new). If you have questions or suggestions, feel free to ping me in twitter [0xAX](https://twitter.com/0xAX), drop me [email](anotherworldofworld@gmail.com) or just create [issue](https://github.com/0xAX/linux-internals/issues/new).
In the next part we will see initialization of the early interruption handlers, kernel space memory mapping and many many more. In the next part we will see initialization of the early interruption handlers, kernel space memory mapping and a lot more.
**Please note that English is not my first language and I am really sorry for any inconvenience. If you found any mistakes please send me PR to [linux-internals](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 found any mistakes please send me PR to [linux-internals](https://github.com/0xAX/linux-insides).**