michaelkuc6/blog_os
1
0
Fork 0
mirror of https://github.com/phil-opp/blog_os.git synced 2025-12-16 22:37:49 +00:00
Code Issues Projects Releases Wiki Activity

Update repository URL (it was renamed to blog_os)

Browse Source
This commit is contained in:
Philipp Oppermann
2015-10-06 16:18:44 +02:00
parent 99a3979c68
commit 282206e3ff
3 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
_posts/2015-08-18-multiboot-kernel.md
View File

@@ -9,7 +9,7 @@ I tried to explain everything in detail and to keep the code as simple as possib
[Rust]: http://www.rust-lang.org/
[create an issue]: https://github.com/phil-opp/phil-opp.github.io/issues
[source code]: https://github.com/phil-opp/blogOS/tree/multiboot_bootstrap/src/arch/x86_64
[source code]: https://github.com/phil-opp/blog_os/tree/multiboot_bootstrap/src/arch/x86_64
## Overview
When you turn on a computer, it loads the [BIOS] from some special flash memory. The BIOS runs self test and initialization routines of the hardware, then it looks for bootable devices. If it finds one, the control is transferred to its _bootloader_, which is a small portion of executable code stored at the device's beginning. The bootloader has to determine the location of the kernel image on the device and load it into memory. It also needs to switch the CPU to the so-called [protected mode] because x86 CPUs start in the very limited [real mode] by default (to be compatible to programs from 1978).