Pintos-OS

Pintos is an educational operating system for the x86. Pintos was developed for Stanford’s CS 140 operating systems course.

Official website of Pintos-OS is pintos-os.org.
To know more about the operating system and projects related to it, visit http://courses.mpi-sws.org/os-ss13/assignments/pintos/pintos.html.

This version of Pintos-OS is froked from git://pintos-os.org/pintos-anon.
You can also view the Stanford git repository of Pintos-OS using their web CGI http://pintos-os.org/cgi-bin/gitweb.cgi.

Getting Started

There are two branches for the base operating system (without the project code): master and configured.
The unmodified fork of the original repository is in the master branch.
The version modified to use QEMU with other relevant modifications is in the configured branch.

Start by cloning the code base to your machine. This will clone both branches and checkout to master branch.
```
git clone https://github.com/shreyanshkuls/CS310-pintos.git
```
If you want to directly clone the configured branch only, use the command bellow and directly skip to Build.
```
git clone --single-branch --branch configured https://github.com/shreyanshkuls/CS310-pintos.git
```

Configure

Following these steps will configure the operating system to use QEMU for emulation for linux systems.

Navigate to CS310-pintos/src/threads, open Make.vars in a text editor and change line 7 to SIMULATOR = --qemu.
Now navigate to CS310-pintos/src/utils and edit pintos-gdb by changing the line 4 to GDBMACROS=../misc/gdb-macros.
In the same directory, edit the file pintos by changing:
- Line 103 to $sim = "qemu" if !defined $sim;
- Line 621 to my (@cmd) = ('qemu-system-x86_64');
Modify squish-pty.c file by commenting
- Line 10
- Line 288-293 (both inclusive)
Comment Line 11 in squish-unix.c

Build

Before building the system, make sure to add the path to pintos in the PATH variable so that tests can be run as soon as the system is built. You can do so by adding this line in the ‘~/.bashrc’ file.

export PATH="<path to directory>/CS310-pintos/src/utils:$PATH"

Change the directory to CS310-pintos/src/utils and run make. This will compile the utilities in the folder.
Navigate to CS310-pintos/src/threads and run make. This will compile the kernel and make a new directory build in the current directory.

Run

You can check if the Pintos-OS is installed properly by running the following command in the CS310-pintos/src/threads directory.

pintos run alarm-multiple