OS Foundations

[!NOTE] This module explores the core principles of OS Foundations, deriving solutions from first principles and hardware constraints to build world-class, production-ready expertise.

The Invisible Manager

An Operating System is the software that manages your hardware. It is the reason you can run multiple programs at once, save files without knowing disk sectors, and browse the web securely.

In this module, we will demystify the Kernel, the heart of the OS. We will explore how it starts (Boot), how it protects itself (Rings), and how applications talk to it (Syscalls).

Chapter Roadmap

  1. Introduction to OS: The two roles of an OS: Abstraction and Arbitration.
  2. Kernel Architecture: Monolithic vs Microkernels. Why Linux is faster but crashes more than Minix.
  3. System Calls: The API of the Kernel. How read() and write() actually work.
  4. User vs Kernel Mode: Hardware protection rings. Why your app cannot crash the OS.
  5. The Boot Process: From power button to login prompt. The chain of trust.

1. Interactive: System Monitor

A live view of a hypothetical system.

CPU Load
12%
Memory Usage
4.2 GB
Processes
142
Running

Module Chapters