BaseOS

A tiny 32-bit kernel I'm writing from scratch in C and Assembly. It boots into a custom VGA GUI (Mode 13h) with a few basic apps.

What is this?

I built this to understand how OS kernels work at the lowest level. It's not POSIX-compliant or anything fancy, but it handles:

• Booting: A custom 16-bit bootloader that jumps to 32-bit protected mode.
• Graphics: Direct VGA memory writing (320x200, 256 colors) with a custom windowing system and font rendering.
• Input: PS/2 keyboard driver.
• Apps: A simple menu, a "Hello World" demo, and a Settings page to change the theme.

How to Run

You'll need qemu, nasm, and a cross-compiler (like x86_64-elf-gcc).

On macOS:

brew install x86_64-elf-gcc nasm qemu

Then just run:

make run

This will compile everything, build the floppy image, and launch QEMU.

Project Layout

• boot.asm: The bootloader.
• kernel.c: The entire kernel (graphics, logic, drivers).
• font.h: Bitmap font definitions.
• kernel_entry.asm: Assembly stub to jump into C code.

Future Plans

• Mouse support
• A simple file system (maybe FAT12?)
• Text editor

License

MIT. Use this however you want!