OS From Scratch

I always wanted to learn how OS works behind the scenes.

• How it handles various windows of applications.
• How it runs background processes.
• How it connects to various different hardwares seemlessly.

So I decided to start building my own OS from scratch

TODO list

• Bootloader
  • disk read
  • 16 bit print and hex print
  • gdt for 32 bit protected mode
  • 32 bit print
  • Splash screen
• Kernel
  • Basic screen driver
  • Clear screen function
  • Print functions with scroll and newline
  • Interrupt handling
  • Keyboard Support
  • File system
• Core OS
  • Cursor support
  • External application support
  • GUI components

Compiling

You will need gcc, ld and nasm

I use this docker image for compiling cross-compiler tools which is recommed for 32 bit i386 OS.

docker run -it lordmilko/i686-elf-tools -gv 9.2.0 -bv 2.34 -dv 9.1

And copy the build zip generated inside container /root/build-i686-elf/i686-elf-tools-linux.zip to another ubuntu container.

You will need qemu too to test compiled os.

Run make compile and then make start

Result

Scrolling and Timer -

Keyboard interrupt -

Thanks

cfenollosa/os-tutorial

OSDevWiki

bkerndev(OSDever) PIT