Learning OS development

This repo is just a personal stash of things that I've learned trying to understand how modern day operating systems are programmed and work. It might not be 100% structured logically but take it as my learning process around it all. Feel free to poke around.

Structure

PART I

• Chapter 1 was my first try at creating a basically empty boot sector for legacy x86 BIOS [check]
• Chapter 2 further familiarization of assembler language (x86): stack, conditional jumps, interrupt output, functions etc. [check]
• Chapter 3 memory access, segmentation etc [check]
• Chapter 4 32-bit protected mode [check]
• Chapter 5 C-assembly translation and study [check]
• Chapter 6 trying to create a simple kernel
  • learning GCC cross compilation [check]
  • simple kernel routine displaying an 'X' [check]
  • simple C library functions [memcpy, strcat, int2str]
• Chapter 7 Programming my own low level device drivers
  • IO controller routines [check]
  • VGA text-mode printing + clear screen [check]
  • scrolling [check]
• Chapter 8 Interrupt handling in PM and Kernel

Tutorials stop here and things diverge. For me, following topics I wanna know about:

PART II

No particular order from here on out.

• Long mode: How to get to 64-bit
  • Look at branch longmode
• Getting to know Rootkits
• UEFI: my first attempt to do anything with UEFI
• Loading kernel with UEFI
• Linux kernel: Trying to understand it with the knowledge I gained now

Sources

The following sources where used to do the various things in this repo

• [1] https://www.cs.bham.ac.uk/~exr/lectures/opsys/10_11/lectures/os-dev.pdf
• [2] https://littleosbook.github.io/#the-bootloader
• [3] https://github.com/cfenollosa/os-tutorial
• [4] https://0xax.gitbooks.io/linux-insides/content/Booting/linux-bootstrap-1.html
• [5] The wiki.osdev.org websites