arno/linux-insides
1
0
Fork 0
mirror of https://github.com/0xAX/linux-insides.git synced 2025-01-03 12:20:56 +00:00
Code Issues Releases Wiki Activity

Finish with fourth part of booting process

Browse Source
This commit is contained in:
Alexander Kuleshov 2016-01-24 00:05:15 +06:00
parent 3e2e3b823c
commit 7a92195259
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Booting/linux-bootstrap-4.md
View File

@ -497,7 +497,7 @@ Here we do almost the same as in the previous example, all entries will be with
That's all. All preparation are finished and now we can see transition to the long mode. That's all. All preparation are finished and now we can see transition to the long mode.
Transition to long mode Transition to the 64-bit mode
-------------------------------------------------------------------------------- --------------------------------------------------------------------------------
First of all we need to set the `EFER.LME` flag in the [MSR](http://en.wikipedia.org/wiki/Model-specific_register) to `0xC0000080`: First of all we need to set the `EFER.LME` flag in the [MSR](http://en.wikipedia.org/wiki/Model-specific_register) to `0xC0000080`:
@ -525,13 +525,13 @@ After this we push this address to the stack and enable paging by setting `PG` a
movl %eax, %cr0 movl %eax, %cr0
``` ```
and call: and execute:
```assembly ```assembly
lret lret
``` ```
Remember that we pushed the address of the `startup_64` function to the stack in the previous step, and after the `lret` instruction, the CPU extracts the address of it and jumps there. instruction. Remember that we pushed the address of the `startup_64` function to the stack in the previous step, and after the `lret` instruction, the CPU extracts the address of it and jumps there.
After all of these steps we're finally in 64-bit mode: After all of these steps we're finally in 64-bit mode: