Operating System

A command-line operating system based on Xv6. The base of the system can be found in the src/base directory.

The project was a part of Systems Programming module.

Features

Each stage was built on top of the previous one. Therefore, a gradual improvement can be seen. Code for each of the stages can be found on the separate-stages branch.

Stage 1

Implementation of cd

• cd – go to the root directory,
• cd .. – go to the directory above,
• cd [dir] – go to the specified directory/path.

Stage 2

Implementation of ls

• ls – list files and directories in the current working directory (cwd),
• ls [dir] – list files and directories from the specified path.

Stage 3

Implementation of -l flag for ls

• ls -l – list files and directories in the cwd and their details,
• ls [dir] -l – list files and directories with details from the specified path.

Stage 4

Enabling ls to work in the root directory.

Setup

Windows

1. Install Cygwin.

   When you get to the 'Select Packages' screen, click on the small icon to the right of 'Devel'. The 'txst' to the right of it should change to 'Install' instead of 'Default'. You can now continue with the rest of the installation process, accepting the rest of the defaults.

   Note that Cygwin will take a long time to install, possibly well over an hour, since it pulls all of the tools down over the Internet.

2. Install ImDisk.

3. Install Bochs 2.6.9.

4. In Cygwin, navigate to the project directory and compile with make.

   To access a drive with its letter, use cd /cygdrive/[drive-letter].

5. In Bochs, load the bochsrc.bxrc file and start the virtual machine.

   bochsrc.bxrc is essentially a configuration for the virtual machine, which also points to the correct disk image.