oleffa/oos

Writing a hobby operating system from scratch.

Oli's Operating System (OOS)

OOS is a hobby operating system and my first shot at OS development.

It features a simple bootloader written in assembly and a basic 32-bit kernel written in C.

Features

• Small Bootloader written in assembly
• Writing to video buffer
• Interrupt driven timer
• Basic Keyboard input support
• Video buffer color schemes

How to use

• Requires QEMU, GCC (i used a cross compiler for i686-elf: https://wiki.osdev.org/GCC_Cross-Compiler), NASM
• Run make to generate os.img
• Run make run to run the os in QEMU

Code

• boot/ contains assembly code for the bootloader and Global Descriptor Table initialization
• kernel/ contains kernel code written in C and some assembly code for interrupts and to initialize the C environment

TODO

• Write console application
• Get the OS to run on actual hardware
• Fix the uptime output (integer to string function)
• Add function to switch color schemes
• What next (Memory manager, VGA driver, device interface, file system support and disk drives to access files and open applications, multitasking support)

Used Tutorials:

• lowlevel.eu: http://www.lowlevel.eu/wiki/ (German)
• osdev.org: http://wiki.osdev.org/Tutorials
• Brans kernel tutorial: http://www.osdever.net/tutorials/view/brans-kernel-development-tutorial