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boot/pm: fix some expressions

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Alexander Kuleshov 2017-09-10 17:58:45 +06:00
parent 6703f0ace4
commit b5d147bf72
1 changed files with 4 additions and 2 deletions
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Booting/linux-bootstrap-3.md
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@ -556,13 +556,15 @@ movl %ecx, %gs
movl %ecx, %ss
```
If you paid attention, you can remember that we saved `$__BOOT_DS` in the `cx` register. And setup valid stack for debugging purposes:
If you paid attention, you can remember that we saved `$__BOOT_DS` in the `cx` register. Now we fill it with all segment registers besides `cs` (`cs` is already `__BOOT_CS`).
And setup valid stack for debugging purposes:
```assembly
addl %ebx, %esp
```
Now we fill it with all segment registers besides `cs` (`cs` is already `__BOOT_CS`). Next we zero out all general purpose registers besides `eax` with:
The last step before jump into 32-bit entry point is clearing of general purpose registers:
```assembly
xorl %ecx, %ecx