arno/linux-insides
1
0
Fork 0
mirror of https://github.com/0xAX/linux-insides.git synced 2024-12-22 14:48:08 +00:00
Code Issues Releases Wiki Activity

Merge pull request #519 from danix800/patch-1

Browse Source 
Fix register typos and correct explanation of the first ljmpl target
This commit is contained in:
0xAX 2017-09-16 14:01:24 +06:00 committed by GitHub
commit 6666150af6
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Booting/linux-bootstrap-3.md
View File

@ -507,7 +507,7 @@ It takes two parameters:
Let's look inside `protected_mode_jump`. As I wrote above, you can find it in `arch/x86/boot/pmjump.S`. The first parameter will be in the `eax` register and the second one is in `edx`.
First of all, we put the address of `boot_params` in the `esi` register and the address of code segment register `cs` (0x1000) in `bx`. After this, we shift `bx` by 4 bits and add the address of label `2` to it (we will have the physical address of label `2` in the `bx` after this) and jump to label `1`. Next we put data segment and task state segment in the `cs` and `di` registers with:
First of all, we put the address of `boot_params` in the `esi` register and the address of code segment register `cs` (0x1000) in `bx`. After this, we shift `bx` by 4 bits and add it to the memory location labeled `2` (which is `bx << 4 + in_pm32`, the physical address to jump after transitioned to 32-bit mode) and jump to label `1`. Next we put data segment and task state segment in the `cx` and `di` registers with:
```assembly
movw $__BOOT_DS, %cx