BasicKernel

A very simple Kernel written in C that displays a string and then hangs.

Installation

Have to install gcc, nasm, grub, and qemu(optional).

Building the Kernel

1. Download the repo and cd into it.
2. First Build the assembly file with command nasm -f elf32 kernel.asm -o kernasm.o.
3. Next Build the C file with command gcc -m32 -c kernel.c -o kerc.o.
4. Now link both the kernasm file and kerc file with command ld -m elf_i386 -T link.ld -o kernel kernasm.o kerc.o.

Usage

There are two ways to run the Kernel.

1. This is the direct way, first rename the kernel file as kernel--001(001 meaning the version number, can be anything). Copy this kernel--001 file to the /boot directory. Open the grub.cfg inside grub folder and add the entry:

 menuentry 'My Kernel' {
    set root='hd0,5'
    multiboot /boot/kernel-001 ro
}

Here hd0,5 is sda/sda5, set accordingly. Then reboot.

2. If you've installed qemu then you can run this in the virtual machine using the command: qemu-system-i386 -kernel kernel-001.

License

MIT