https://github.com/vs4vijay/vizix

An operating system for fun and learning.
https://github.com/vs4vijay/vizix

assembly bare-metal clang esp32 gcc kernel linux linux-kernel nasm operating-system os qemu raspberry-pi rust

Last synced: about 1 month ago
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An operating system for fun and learning.

• Host: GitHub
• URL: https://github.com/vs4vijay/vizix
• Owner: vs4vijay
• License: mit
• Created: 2020-03-23T15:45:19.000Z (about 5 years ago)
• Default Branch: main
• Last Pushed: 2025-01-08T16:49:27.000Z (5 months ago)
• Last Synced: 2025-04-05T20:02:53.382Z (about 2 months ago)
• Topics: assembly, bare-metal, clang, esp32, gcc, kernel, linux, linux-kernel, nasm, operating-system, os, qemu, raspberry-pi, rust
• Language: Rust
• Homepage:
• Size: 2.93 KB
• Stars: 3
• Watchers: 2
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# VIZIX

An operating system for fun and learning

## Development Flow (Write an OS)

- Create Boot Sector

- 

## Development Tools Required

- qemu

- nasm

- gcc 

PS: On Mac, Using homebrew: `brew install qemu nasm`

## Running

- `nasm -f bin Vizix.asm -o Vizix.bin`

- `qemu Vizix.bin`

## Bootsector Example:

```

; Infinite loop

loop:

    jmp loop 

; Fill with 510 zeros minus the size of the previous code

times 510-($-$$) db 0

; Magic number

dw 0xaa55

```

## Registers:

- General Purpose Registers:

  - `ax`; Accumulator (EAX)

  - `bx`; Base (EBX)

  - `cx`; Counter (ECX)

  - `dx`; Data (EDX)

- Stack Registers:

  - `bp`; Base Pointer, Stores the base address of stack (EBP)

  - `sp`; Stack Pointer, Stores the top address of stack, sp gets decremented (ESP)

- Pointer Registers:

  - `si`; Source Index, (ESI)

  - `di`; Destination Index, (EDI)

  - `ip`; Instruction Pointer

- Segmentation: Obsolete memory protection technique

  - Segment Register: Can be altered using registers

    - `cs`; Code Segment; Can not be altered

    - `ds`; Data Segment

    - `ss`; Stack Segment

    - `es`; Extra Segment

    - `fs`, `gs`; General Purpose Segment

- Special Registers:

  - `CR0,2,3`

  - `DR0,1,2,3,6,7`

  - `TR4,5,6,7`

## Bootloaders:

- Geek Loading: Everything in Boot Record

- One-stage Loading

- Two-stage Loading: `GRUB` (GRand Unified Bootloader)

### References:

- Little OS Book - https://littleosbook.github.io/

- https://wiki.osdev.org/Bare_Bones

- https://github.com/cfenollosa/os-tutorial

- https://www.cs.bham.ac.uk/~exr/lectures/opsys/10_11/lectures/os-dev.pdf

- https://www.cs.cmu.edu/~410/

- https://wiki.osdev.org/Main_Page

- http://stanislavs.org/helppc/idx_interrupt.html

- https://legacy.gitbook.com/book/samypesse/how-to-create-an-operating-system/details

- https://samypesse.gitbook.io/how-to-create-an-operating-system/

- https://github.com/SamyPesse/How-to-Make-a-Computer-Operating-System

- https://github.com/arjun024/mkernel

- http://3zanders.co.uk/2017/10/13/writing-a-bootloader/

- http://mikeos.sourceforge.net/write-your-own-os.html

- http://osblog.stephenmarz.com/index.html

- https://os.phil-opp.com/

- https://www.rpi4os.com/

- https://s-matyukevich.github.io/raspberry-pi-os/

- https://www.fysnet.net/osdesign_book_series.htm

- https://pages.cs.wisc.edu/~remzi/OSTEP/

- https://operating-system-in-1000-lines.vercel.app/en

### Hardware

- https://eater.net/8bit/

- https://nand.arhan.sh/

- https://www.nand2tetris.org/

- https://nandgame.com/

- https://www.megaprocessor.com/

- https://gitlab.com/x653/nand2tetris-fpga/