YAOS

YAOS (standing for Yet Another Operating System) is a kernel built from scratch.

Goal

Implement a simple & portable kernel

Philosophy

• Avoid tutorials, do the work yourself.
• Understand the internals.
• Keep It Simple Stupid.

Steps

1. Hello World bootsector
2. Load kernel from disk (bootloader)
3. Enter protected mode and then long mode
4. Drivers for simple peripherals

• screen
• keyboard
• timers

5. Implements various parts of standard library

• string functions (strlen, memcpy, ...)
• memory allocation (malloc, free, ...)
• stdio functions (printf, scanf, ...)

6. Write a bare metal game
7. Userspace and system calls