My OS Implementation (Not named yet)

I'm doing a little OS for teaching myself this black magic

Goal

I'm trying to write the possible minimal OS for me, so I will be writing stuff from scratch (that's why I'm not going to use GRUB even, imagine the pain, don't hate me!)

I aim to implement the basic principles of virtualization of CPU and memory, So no fancy stuff? well maybe a very tiny size? ;)

Architecture

The OS targets Legacy BIOS, not UEFI so it's MBR (Master Boot Record). I'm not using any file systems, the code is directly on disk sectors.

Structure of the image (disk.img)

• Bootloader (two stages because of the 512 limit per sector)
  • Stage 1 bootloader on track sector 1
  • Stage 2 bootloader on track sector 2
• Kernel on the rest of the image sectors
  • Drivers
    • 8592 PIC
    • VGA
  • Interfaces & Usermode
    • Terminal Interface

Development Environent

I'm working on Windows, WSL and using NASM as assembler, QEMU for testing as a VM. A i386 GCC cross-compiler is used for developing the kernel. few utilities used like dd for building the floppy disk image. Install the following packages:

sudo apt-get make gcc nasm qemu-system

Resources that I learn from

• https://wiki.osdev.org/
• Intel® 64 and IA-32 Architectures Software Developer’s Manual Volume 3A: System Programming Guide, Part 1
• https://github.com/pritamzope/OS
• http://www.brokenthorn.com/Resources/OSDevIndex.html
• I already learnt assembly before so only I use NASM documentation