Conqueror

A low level Operating System designed using Linux Kernel

To develop the basic low level operating system, we need following

You need to have basic knowledge on

After getting all this, lets start building the Operating System using Kernel

Open the Terminal
Type lsblk command
It will display sdb. Its actually a Hard Drive
Change the user to root by typing the command sudo su
Type cfdisk /dev/sdb
It will open Hard drive partition table
Click on [ New ] and hit enter
Hit Enter again so that it will allocate default size
Click on [ Primary ] and hit enter
Click on [ Bootable ] and hit enter
And then click on [ Write ] and type yes and hit enter
Finally, click on [ Quit ] to exit
Run lsblk command again, then we can see that new partition has been created
This is how we can create a new Bootable hard drive partition to test our OS

Type mkfs.ext4 /dev/sdb1
Go to the folder /mnt by typing cd /mnt
Create a New Folder by typing mkdir folder_name. That will be Name of your OS.
Mount Your Folder using mount /dev/sdb1 folder_name
Now, get into the OS by typing cd folder_name
Remove all the things inside the folder by typing rm -rvf *
Create following folders that will be used for OS Creation by typing the command given below
mkdir -p ./{etc,lib,lib64,boot,bin,sbin,var,dev,proc,sys,run,tmp,src}
After creating the folders, set mknod by typing following commands
mknod -m 600 ./dev/console c 5 1
mknod -m 666 ./dev/null c 1 3
Go to boot folder by typing cd boot
Now, let's copy the Kernel File and Initial Ram Disk from /boot folder
cp /bootvmlinuz-4.19.0-10-amd64 .
cp /boot/initrd.img-4.19.0-10.amd64
Now, let's install some dependences using following command
grub-install /dev/sdb --skip-fs-probe --boot-directory=/mnt/folder_name/boot
It will install grub folder. Now, let's start coding part

Make sure you are in grub directory created previously
Create a new file grub.cfg using any editor. My suggestion is to go with VI
The code is at [ grub.cfg ]. For Explanation, go to [ Documentation/grub/readme.md ]
After that, Go to src folder created in folder_name or simple type cd ../../src
Create folders [ lib ] and [ init ] using mkdir -p ./{lib,init}
Go to lib folder and create [ start.S ]
Get back to src folder and go to init folder and create [ init.c ]