BLOCK-OS

BLOCK-OS is a teaching-based open-source operating system with 32-bit system architecture. It is a simple and small os built-in C and assembly language that teaches one how to implement basic concepts of operating systems from scratch providing one with experience of in-depth understanding of concepts of operating systems.

Features

• Set up BIOS and our kernel at initial level.
• Boot Sector and Boot Loader for booting process.
• Implementation of GDT(Global descriptor table).
• Switch to 32-bit protected mode from 16-bit mode.
• Added support for C.
• Implemented a Graphic Driver that displays graphics on screen.
• Added functions like : COLORA (for changing screen monitor color) , VITBHOPAL(to display messages on the screen) etc.
• Implemented ISR (Interrupt Descriptor Table).
• Set up a Keyboard driver using ISR and PIC.
• Hard disk writing and reading function using ATA.
• Set up audio support using the PLAY() command.
• Global constructor.
• Programmable Interval Timer.

Tech Stack

Main: ASM Assembly Language , C.

Deployment

To deploy this project install following tools: Tools needed to be installed:

NASM, SASM: The Netwide Assembler (NASM) is an assembler and disassembler for the Intel x86 architecture.

https://www.nasm.us/

QEMU: A generic and open source machine emulator and virtualizer to run our BLOCK-OS.

https://www.qemu.org/download/

Hex Editor: https://www.hhdsoftware.com/free-hex-editor VS Code: https://code.visualstudio.com/download

• After installing all the tools follow these steps:

1. Clone the BLOCK-OS repository into your system

2. Create a folder named : "bin"

3. Go to compile.bat file and run.

4. In case it shows error: Inside bin folder create two files: "bootsect.bin" and "kernel.bin"

   Again after doing this, run compile.bat

The BLOCK-OS will start running on QEMU emulator. Now you can test various functions implemented given below.

FUNCTIONS IMPLEMENTED

• CLS: clear screen
• COLORA: set monitor color turquoise
• COLORB: set monitor color purple
• COLORC: set monitor color green
• COLORD: set monitor color light green
• VID: Shows video (scrooling video screen)
• HI: Prints message on screen: "HELLO, GLAD YOU SELECTED BLOCK OS"
• PUT: Write array of "J" in memory
• GET: Read array of "J" from memory
• VITBHOPAL: Prints message on screen: "A place to learn, a chance to grow"
• PLAY: Plays audio
• SLEEP: Timer of 5 seconds

Screenshots