C & C++ Based Operating System

This study was conducted as part of the module "BS1" at Brandenburgerische Technische Universität in Cottbus

This repository is part of an operating systems study project, written in C, C++, and Assembly. It provides a foundational template for learning about OS design, commonly used in European university courses.

Features

Display & Screen Management

• CGA Screen Based: The system uses a CGA (Color Graphics Adapter) for display management, providing basic output functionality.
• CGAchannel.cc: Manages screen output channels.
• CgaScreen.cc: Handles low-level CGA screen operations.

Thread & Activity Management

• Thread Management: The OS supports basic threading mechanisms to allow concurrent execution.
• Activity Management: Manages and schedules different activities (threads) using a Queue.
• Coroutines: Implemented in Coroutine.cc, allowing cooperative multitasking within the OS.

Synchronization & Semaphores

• Semaphores: Used for controlling access to shared resources, enabling safe and synchronized execution of concurrent tasks.

Interrupt Handling

• Gate-based Interrupts: The system uses gates to manage hardware interrupts:
• Interruptguardian.cc: Safeguards interrupt handling.
• Panicgate.cc: Handles critical interrupts and system panics.
• Spuriousgate.cc: Manages spurious interrupts (unwanted interrupts).
• PIC (Programmable Interrupt Controller): Handled in PIC.cc to manage hardware interrupt requests.
• PIT (Programmable Interval Timer): PIT.cc controls time-based events and interrupts.
• Clock.cc: The system's clock module is used for time management and clock interrupts.
• Keyboard.cc: Manages keyboard inputs and associated interrupts.

Parsing & Interpreting

• Calc.cc, Interp.cc, Scanner.cc: Modules that provide basic mathematical interpretation and expression parsing.

PrintStream

• Provides a PrintStream interface for outputting formatted text to the screen.

Custom WSL2 Configuration File

• A custom run file for WSL2 systems.

Run

This operating system is meant to be ran on a bare-bones Linux system. It is required for to have C and C++ compilers installed and bochs emulator.

Run either by running run.sh inside of /system_core, or execute the following command

cd ./system_core/bin
make clean bootdisk
bochs -q