FYSOS: The System Core 
Benjamin David Lunt

2nd Edition
(Updated: 2017 Apr 06)
ISBN-13: 978-1492958444
ISBN-10: 1492958441

Available at Amazon or your favorite book source  and in PDF format 
Volume One of a series of books on Operating System Design

Please go to the bottom of this page and write a review.  Thank you.
The 2nd Edition is now available.  See this .pdf for what's new

 View the Errata 1st Ed. or 2nd Ed. (02 Sept 2017) 
 See below for customer comments 


This book is for those who are building an operating system, or want to start building one.  This book takes you from the first step to the last step to create a minimal multi-threading protected mode OS with a round-robin style task scheduler, memory allocator, etc., as well as retrieving all the information you will need before the switch to protected mode.

This book is for those who want to start but have no idea where or how to do so.  Full source code is included as well as many utilities, all with source, to build your system.

It is designed so that once you have this minimal system up and running, you can then start adding all of the items you need to make it a fully functional operating system.  Part 2 contains an example of a more detailed memory allocator, just an example on how to add to this operating system.

Chapter 11 gives an example of creating the link between the kernel and the devices and file systems attached.  The remaining books in this series explains in more detail these devices.



 Information in the book or on the CD-ROM may include 
 320 pages
 • The Boot Process. How and where your code starts.
 • Partitioning a hard drive. You have full control of the media.
 • Details and/or C Source code to:
   • A20 line
   • BIOS services
   • Booting from CD-ROM's
   • Detecting available memory
   • Quirks of the boot process
   • Tasking/Threading
   • Memory Paging
   • Legacy Hardware: RTC, PIT, PIC
   • Newer Hardware: APIC, ACPI, HPET
   • Multiprocessor detection
   • UEFI BIOS and booting with this new interface

Suggested information you will need prior to reading this book are readily available:
 • All Specifications needed are linked within the book and freely available on-line.
 • You will need moderate knowledge of Assembly Language programming
 • along with other system related knowledge

It is not required that you have extensive knowledge of Operating System Development.  This book explains in detail how to get started, even if you have little or no knowledge of OS Development.

Amazon now has a "Look Inside" of the first few pages of the book including the Contents showing in a bit more detail what is referenced in the book.


 The Companion CD-ROM 

The companion CD-ROM is no longer available due to the ease of access to the internet.  With that being said, the source code is available via github.

See Appendix A for the structure and contents of this repository, which will be updated when time, neccesity, and/or interest allows.


 Table of Contents 
Introduction

Part 1
  1. The System Core Overview
  2. The Boot Process
  3. Our Enhanced Master Boot Record
  4. UEFI GUID Partition Tables
  5. Our Booted Partition
  6. Kernel Descriptors
  7. The A20 Line
  8. Finish the Loader
  9. The Kernel
 10. Putting it all Together
 11. Where to Go From Here

Part 2
 12. The Paging Manager
 13. The FYSOS Memory Allocator
 14. The UEFI System BIOS

Part 3
 15. The Real Time Clock
 16. The Programmable Interval Timer
 17. The Programmable Interrupt Controller
 18. The Multi-processor Specification
 19. Advanced Configuration and Power Interface
 20. The Advanced Programmable Interrupt Controller
 21. The High Precision Event Timer

Appendix A - Disc Contents
Appendix B - Included Utilities/Source Code
Appendix C - Tables and Figures
Appendix D - NEC MS-DOS 3.30 MBR's
Appendix E - Partition Identification Types
Appendix F - Finding the Boot Device
Appendix G - Processor Exceptions/Interrupts
Appendix H - Trusted Computing
Appendix I - Booting CD-ROM's
Appendix J - Segmented Addressing
Appendix K - The CPUID Instruction and MSR's
Appendix X - For More Information

Bibliography

A more detailed Table of Contents (pdf), stripped directly out of the book.



 User Comments 
"I have just started on System Core and what I have read so far has really been informative and awesome", Sanjay
"Thank you for this book! It's very nice to know someone has written a book on how to build OSs. I'm passionate about the matter and I play with low level stuff like that every day", Fabrizio Curcio
"A must read for anyone interested in Hobby OS's", Michael Tindal
"I am a big fan of your books, and they have helped me immensely understanding how x86 hardware works, and how to write an OS for it", Jan Meznik
"I am really looking forward to start learning from your books, and am waiting for the release of the next one from the series. Thank you very much!", Seng
"Can't wait to get deep into these. Thanks for publishing this series.  The font and pageing formats are AWESOME.", Daniel de la Rosa
"I enjoyed reading your OS books", Kenneth J. Davis
"I am enjoying the book", Paul D. Cotts
"I have just received your books, which kept my attention as I am also wanting to write an os", Filipe Fonseca
"I recently purchased two of your books. They are incredible, I've loved them so far!", Russell Coleman
"Great work on Book 1! This is the only book that goes deep in the details in the way I have been looking for", Bruno David
"Thanks for teaching me everything about writing my own OS! I absolutely loved it, so I bought most of the others.", Jan Meznik
"Thank you so much for your book on the OS core specifically in regards to booting. I appreciate your writing style as teaching and for a hobbyist instead of a dry technical manual.", Micheal Boggess
"Your book series is very good!", Pierpaolo Pierozzi
"I immediately began to plot to obtain the series. I'm going one at a time and looking forward to it", Nick