2014-09-29 08:39:34 +00:00
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os-tutorial
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===========
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How to create an OS from scratch
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2014-09-29 09:00:02 +00:00
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I have always wanted to learn how to make an OS from scratch. In college they taught us
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how to implement advanced features (pagination, semaphores, memory management, etc)
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but:
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- I never got to start from my own boot sector
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- College is hard so I don't remember most of it.
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Inspired by [this document](http://www.cs.bham.ac.uk/~exr/lectures/opsys/10_11/lectures/os-dev.pdf)
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and the [OSDev wiki](http://wiki.osdev.org/), I'll try to make short step-by-step READMEs and
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code samples for anybody to follow.
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2014-09-29 09:51:49 +00:00
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I will not explain the theory. Google is your friend.
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Theory is already covered by thousands of PDFs from Universities
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and the Wikipedia.
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This course is a code tutorial, not a real CS lecture.
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To make up for the lack of theory, the "lessons" are tiny
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and may take 5-15 minutes to complete. Each new concept
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is presented on a new lecture.
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2014-09-29 09:00:02 +00:00
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How to use this tutorial
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------------------------
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First, go through every folder in order. They build on previous code, so if
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you jump right to folder 08, you may find a lot of stuff which is not related
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to what folder 08 is about.
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To see the increments between "lessons", do a diff between folders.
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2014-09-29 09:51:49 +00:00
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Each lesson README starts with the concepts you should be familiar with
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before reading the code.
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2014-09-29 09:29:17 +00:00
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Second, for each folder, read the README. It is **very concise**. The only theory.
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is the required to understand the code.
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Then, look at the code examples. You can try to write them by
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2014-09-29 09:00:02 +00:00
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yourself on a different folder, modify them slightly and play a bit with the
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2014-09-29 09:29:17 +00:00
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code, you know, the usual.
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2014-09-29 09:00:02 +00:00
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Finally, the code files provided in each folder are the final result. If
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you want to learn quickly (though not as thoroughly), just read the
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provided code files.
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TL;DR: First read the README on each folder, then decide if you will
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implement it yourself or just read the provided code files.
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Contributing
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------------
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I'm still learning this. For the moment, please restrict your contributions to fixing possible bugs
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or improving existing documents. I'm not yet ready to accept enhancements.
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