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Embedded Systems Architecture - Second Edition

You're reading from  Embedded Systems Architecture - Second Edition

Product type Book
Published in Jan 2023
Publisher Packt
ISBN-13 9781803239545
Pages 342 pages
Edition 2nd Edition
Languages
Author (1):
Daniele Lacamera Daniele Lacamera
Profile icon Daniele Lacamera

Table of Contents (18) Chapters

Preface 1. Part 1 – Introduction to Embedded Systems Development
2. Chapter 1: Embedded Systems – A Pragmatic Approach 3. Chapter 2: Work Environment and Workflow Optimization 4. Part 2 – Core System Architecture
5. Chapter 3: Architectural Patterns 6. Chapter 4: The Boot-Up Procedure 7. Chapter 5: Memory Management 8. Part 3 – Device Drivers and Communication Interfaces
9. Chapter 6: General-Purpose Peripherals 10. Chapter 7: Local Bus Interfaces 11. Chapter 8: Power Management and Energy Saving 12. Chapter 9: Distributed Systems and IoT Architecture 13. Part 4 – Multithreading
14. Chapter 10: Parallel Tasks and Scheduling 15. Chapter 11: Trusted Execution Environment 16. Index 17. Other Books You May Enjoy

System resource separation

The example operating system we have built throughout this chapter already has many interesting features, but it is still characterized by a flat model, with no memory segmentation or privilege separation. Minimalist systems do not provide any mechanisms to separate system resources and regulate access to the memory space. Instead, tasks in the system are allowed to perform any privileged operation, including reading and altering other tasks’ memory, executing operations in the address space of the kernel, and directly accessing peripherals and CPU registers at runtime.

Different approaches are available on the target platform, aimed at increasing the level of safety on the system by introducing a limited number of modifications to the kernel to:

  • Implement kernel/process privilege separation
  • Integrate memory protection in the scheduler
  • Provide a system call interface through the supervisor call to access resources

Let’...

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