So Lets Start The build For the OS but before it we need to know about the tools we need to use in it .

Tools

Text Editor (I am using nano) make NASM (assembler ) qemu (Virtual Software)

System

I am using a Windows 11 machine with WSL enabled in it .

Step 1 (Making of dir and files )

To Start it we need to create some files and folder in which all the codes will saved

itswiz@TheWiz:~/TWZ$ mkdir src
itswiz@TheWiz:~/TWZ$ cd src/
itswiz@TheWiz:~/TWZ/src$ nano main.asm

We need to start with assembly first to write the basic bootloader and after that we will switch to c for more codes

Basic to Assembly language

Assembly language is a low-level programming language that allows programmers to communicate with a computer's hardware. It's designed to be readable by humans, unlike machine language, which is made up of binary and hexadecimal characters In this case we will use assemblyX86 for the code

How a computer Starts up?

1. BIOS is copied from a ROM chip into RAM
2. BIOS starts executing code

• initializes hardware -run some tests (POST = power-on self test)

3. BIOS searches for an operating system to start
4. BIOS loads and starts the operating system
5. Operating system runs

How BIOS find the OS ?

1. Lagacy booting
2. BIOS loads first sector of each bootable device into memory ( at location 0x7C00 )
3. BIOS checks for 0xAA55 signature
4. If found , it start executing codes
5. EFI -BIOS looks into EFI partitions

• bla bla (We are doing it in Lagacy booting so fuck EFI)