notxia / pandos-plus

An operating system based on the MIPS architecture

PandOS+

Introduction

Project for the Operating Systems course at the University of Bologna (A.Y. 2021-2022).

Description

PandOS+ is a didactic operating system for the MIPS architecture running on the µMPS3 emulator.
The project consists of three phases:

• Phase 1: implementation of some basic data structures.
• Phase 2: implementation of the kernel basic functionalities such as process scheduling, kernel mode system calls and interrupts handling.
• Phase 3: implementation of the virtual memory manager and user processes handling.

Installation

µMPS3 emulator is required to run the operating system. Refer to the official wiki for the installation.
To compile the source code, a GCC cross-compiler to MIPS is also required (Note: it should come along with µMPS3).

Compiling

To compile the project run the following commands:

mkdir build
cd build
cmake -D CMAKE_TOOLCHAIN_FILE=../mips.cmake ..
make

mips.cmake contains the cross-compiler information.

Testing

Move into the build directory and compile the test programs by running:

cp -r ../phase3/test/{testers,umps3.json} .
make -C testers

Then load the umps3.json configuration into µMPS3. (Depending on the installation, some paths in umps3.json may need to be adjusted).
Since the test programs run concurrently and each of them outputs on different terminals, it is recommended to open all terminals (Windows > Terminal [0-7]) before starting the O.S.

Credits

The CMake file structure was written starting from the one of this project.

pandos-plus's Issues

Utilizzo del PLT errato

Il tempo del PLT viene impostato senza scalarlo in base al clock.