![]() The implementation was done in many small steps, and after each step the OS was tested manually. The OS was developed in about six weeks of full-time work. The documentation and information surrounding the details of the hardware we had to work with was not always easy to find or understand, despite (or perhaps due to) the age of the architecture. It was not a difficult choice to use the x86 architecture as the target of the OS, with its large community, extensive reference material and mature emulators. The x86 architecture is, and has been for a long time, one of the most common hardware architectures. Another goal of the course was writing a thorough tutorial on how to develop a small OS basically from scratch, and this short book is the result. In order to get more insight and a deeper understanding of how the theory from the previous OS courses works out in practice, the authors decided to create a new course, which focused on the development of a small OS. The authors had previously taken courses in OS theory, but had only minor practical experience with OS kernel development. The OS kernel and this book were produced as part of an advanced individual course at the Royal Institute of Technology, Stockholm. In the last three chapters we discuss the more advanced topics of file systems ( chapter 12), system calls ( chapter 13), and multitasking ( chapter 14). In chapter 7 we start the road to user mode applications, with virtual memory through paging ( chapter 8 and 9), memory allocation ( chapter 10), and finally running a user application in chapter 11. ![]() We continue in chapter 4 with writing to the screen and the serial port, and then we dive into segmentation in chapter 5 and interrupts and input in chapter 6.Īfter this we have a quite functional but bare-bones OS kernel. In chapter 2 and 3 we set up our development environment and boot up our OS kernel in a virtual machine, eventually starting to write code in C. At the end of some chapters there are links for further reading, which might be interesting and give a deeper understanding of the topics covered. Later chapters give more of an outline of what is needed, as more and more of the implementation and design becomes up to the reader, who should now be more familiar with the world of kernel development. The starting chapters are quite detailed and explicit, to quickly get you into coding. Lists and details on current operating systems are available on the Internet. For OS theory we recommend the book Modern Operating Systems by Andrew Tanenbaum. This book is not about the theory behind operating systems, or how any specific operating system (OS) works. We’ve tried to collect parts of the vast (and often excellent) expanse of material and tutorials available, on the web and otherwise, and add our own insights into the problems we encountered and struggled with. It is designed to give enough help with the technical details while at the same time not reveal too much with samples and code excerpts. ![]() This text is a practical guide to writing your own x86 operating system.
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