ShardOS

ShardOS is a simple operating system built from scratch for educational purposes. This project demonstrates the basics of OS development, including bootloading, kernel development, and simple hardware interaction.

Screenshot

Prerequisites

To build ShardOS, you need the following tools installed on your Linux system:

nasm (Netwide Assembler)
gcc (GNU Compiler Collection)
ld (GNU Linker)
qemu (for emulation and testing)

You can install these tools using your package manager. For example, on Debian-based systems like Ubuntu, run:

sudo apt update
sudo apt install nasm gcc make qemu-system-x86

Building ShardOS

1. Assemble the Bootloader

Assemble the bootloader using nasm:

nasm -f elf32 boot/boot.asm -o boot.o

2. Compile the Kernel

Compile the kernel using gcc:

gcc -m32 -ffreestanding -c kernel.c -o kernel.o

3. Link the Object Files

Link the bootloader and kernel using ld:

ld -m elf_i386 -T link.ld -o ShardOS.bin boot.o kernel.o

4. Create a Bootable Image

Create a bootable image by concatenating the boot sector and the kernel:

dd if=/dev/zero of=boot.img bs=512 count=2880
dd if=ShardOS.bin of=boot.img conv=notrunc

5. Run with QEMU

Run your OS using QEMU:

qemu-system-i386 -fda boot.img

File Structure

boot/boot.asm: Assembly code for the bootloader.
kernel.c: C code for the kernel.
link.ld: Linker script for combining the bootloader and kernel into a single binary.
deprecated/stage1/2.asm: Old attempt at making a Standalone OS purely in Assembly

Contributing

Contributions are welcome! Feel free to submit issues or pull requests.

License

This project is licensed under the GNU General Public License v3.0.

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