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x86_64-decOS-MSC-KIIT

A x86 architecture based 64bit operating system(x86_64-decOS) written entirely from scratch. Written mainly in C/C++ and assembly to test and implement various OS modules interrupt handling, memory management unit, user processes, VFS(file system), system calls, paging memory encryption and lot more. x86_64-decOS design requires to understand the working of operating systems internally, x86 architecture, assembly, calling conventions(SYSTEM5 AMD64), and low-level stuff.

Features

  • Exceptions and interrupt handling
  • Memory management unit
  • User processes implementation
  • System calls implementation
  • Keyboard driver and console
  • File system to read and write data
  • Program Execution
  • I/O operations
  • File system manipulation
  • IPC
  • Error handling (Interrupt Handling)
  • Resource allocation
  • Memory protection and Security

Why?......

There are many reasons to build an operating system from scratch.

For me, the main two reasons are for fun and to learn new things. When I grew bored of working on my custom compiler, I decided to work on a new project and I chose Operating System Development. It's probably the most complicated hobby project that can be done. I had to learn plenty of things to be advance during this project. There are tons of difficulty that you don't even think about in normal programs. More generally, since I love programing, I was sure I could have a lot of fun developping my own OS. There is also the geek side of having its own OS :)

.......and How?

Writing an operating system from scratch is not easy and at each step you need a lot of information that is not necessarily easily available. Generally, the more advanced your OS is, the less information you'll find.

The main two resources for develpment have been:

A good series of tutorials to start with is the Broken Thorn series. I haven't followed the complete tutorial (only some specific parts), but it's full of good information and it's probably a good place to start.

There are also the Junfeng Yang Series. It's much less complete, but if you like tutorials, it's probably going to be helpful.

And of course (if you develop on Intel), the Intel 64 and IA-32 Architectures Software Developer's Manual, there are several parts to the guide, I've mainly used the System Programming - Part 1 part. Although it can seem heavy, it's pretty good and will be an invaluable asset to understand the architecture: for instance, paging and interrupts handling.

Interface Requirements

USER INTERFACE:-

  • A GUI, with icons and windows, etc.
  • A command-line interface for running processes and scripts, browsing files in directories, etc.
  • Console: C/C++, assembly(SYSTEM 5AMD64 calling convention)
  • File system (FAT12)

HARDWARE INTERFACES:-

  • Keyboard functionality
  • Linux(preferred)/Windows OS
  • 1GB page support with RAM (1024MB)
  • x64 + system hardware
  • INTEL 64 and IA-32 architecture

SOFTWARE INTERFACES:-

  • nasm assembler
  • C/C++ cross-compiler
  • git
  • GitHub
  • VirtualBox

License

x86_64-decOS is distributed under the MIT License. Read LICENSE for details.