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<h1 id="getting-started">Getting Started</h1>

<h2 id="introducing-cosmos">Introducing Cosmos</h2>
<p>Cosmos (C# Open Source Managed Operating System) is an operating system
development kit which uses Visual Studio as its development environment.
Despite C# in the name any .NET based language can be used including VB.NET,
Fortran, Delphi Prism, IronPython, F# and more. Cosmos itself and the kernel
routines are primarily written in C#, and thus the Cosmos name. Besides that,
NOSMOS (.NET Open Source Managed Operating System) sounds stupid.</p>
<p>Cosmos is not an operating system in the traditional sense, but instead it is
an &quot;Operating System Kit&quot;, or as I like to say &quot;Operating System Legos&quot;.
Cosmos lets you create operating systems just as Visual Studio and C# normally
let you create applications. Most users can write and boot their own operating
system in just a few minutes, all using Visual Studio. You can debug your operating system directly from Visual
Studio using breakpoints.</p>
<p>Cosmos is available in two distributions, the developer kit (dev kit), and the user kit. The dev kit is designed for users who want to work on Cosmos itself.
The user kit is designed for those who are interested in building their own
operating system and doing some Cosmos work. The dev kit might be thought of
as the Cosmos SDK. Most users should start off with the user kit as it is not
so overwhelming like the dev kit. This article focuses on the user kit.</p>
<h2 id="writing-your-first-operating-system">Writing your first Operating System</h2>
<p>Create a new project as you would any C# project, but select Cosmos as the project type.</p>
<p><img src="images/SNAG-0000.png" alt=""></p>
<p>A starter project will be created. It looks very much like a standard C#
console application.</p>
<p><img src="images/SNAG-0001.png" alt=""></p>
<p>Kernel.cs contains the boot and execution code. Instead of seeing a Windows
console window, you will see the following:</p>
<p><img src="images/SNAG-0003.png" alt=""></p>
<p>This is your operating system running in VMware Player! Cosmos can of course
also be booted in VMware Workstation, Hyper-V, Virtual PC, Bochs, or on real
hardware. But by default Cosmos uses VMware Player because it is both free,
and reliable. Cosmos can even debug in Visual Studio, even when running on
another machine.</p>
<h2 id="integrated-debugging">Integrated Debugging</h2>
<p>Debugging is a major issue with operating system development. The Cosmos team
was not content enough to simply conquer building and deployment, we want to
make developing operating system as easy as developing Windows applications.
Debugging a Cosmos based operating system should feel very familiar to you.
Lets modify our project a little bit to show the effect, and set a breakpoint.
<strong>Note that the debugger only works in Visual Studio, and not Linux</strong></p>
<p><img src="images/SNAG-0005.png" alt=""></p>
<p>Now run the project again.</p>
<p><img src="images/SNAG-0007.png" alt=""></p>
<p>Note that the execution stopped at &quot;One&quot;? That is becuase in Visual Studio our
project has stopped on a breakpoint. Simply press F5 to continue just as you
would in a normal application!</p>
<p>In addition to breakpoints Cosmos also supports step into (F11) as well. Trace
over (F10) is not supported yet.</p>
<h2 id="debugger-communication">Debugger Communication</h2>
<p>The debugger uses the serial port to communicate. Because of this, debugging
only works wtih virtualization environments that support serial ports such as
VMware. QEMU supports serial ports as well, but its serial port implementation
is seriously broken on Windows and makes debugging impossible using QEMU. To
debug on real hardware, you must use a physical serial cable. In the future
Cosmos will also support debugging over Ethernet.</p>
<h2 id="extra-debugging">Extra Debugging</h2>
<p>Cosmos supports some explicit methods that can be used to communicate with the
debugger and use additional functionality. It is accessed using the Debugger
class in the Cosmos.Debug namespace in the Cosmos.Kernel assembly. This
assembly is used by all Cosmos projects.</p>
<h2 id="code-based-breakpoints">Code Based Breakpoints</h2>
<pre><code>mDebugger.Break();
</code></pre>
<p>Break can be used to issue a code based break. Visual Studio will break on the
line after this statement.</p>
<p><img src="images/SNAG-0006.png" alt=""></p>
<p>Since Cosmos does not support conditional breakpoints in the IDE yet, code
base breaks are very useful for implementing such. For example:</p>
<pre><code>if (x == 5) {
mDebugger.Break();
}
</code></pre>
<p>Or you can use the .NET BCL debugger break:</p>
<pre><code>System.Diagnostics.Debugger.Break();
</code></pre>
<p>Both functions will produce the same result.</p>
<h2 id="debug-output">Debug Output</h2>
<p>Debug strings can be output to the debug window of the host. Because Cosmos
does not support watches yet, this functionality can be very useful for
watching variable values and for performing tracing without breakpoints.</p>
<pre><code>mDebugger.Send(&quot;Hello from Cosmos!&quot;);
</code></pre>
<p>When this line is executed, it will send a message over the debugging channel
and it will appear in the Visual Studio output window.</p>
<p><img src="images/SNAG-0008.png" alt=""></p>
<h2 id="whats-the-catch">What's the catch?</h2>
<p>There really is no catch. Everything we've shown here is functioning as seen.
No mockups were used. However we still have a lot of work to go. Items of
interest that are on our current task list include threads and networking.
We have prototypes and experiments for each, but none have been rolled into
the mainline Cosmos development as of yet.</p>
<h2 id="obtaining-cosmos">Obtaining Cosmos</h2>
<ul>
<li>Cosmos Website - <a href="http://www.GoCosmos.org">http://www.GoCosmos.org</a></li>
<li>Source Code - Both dev kit and user kit - <a href="http://github.com/CosmosOS/Cosmos/">http://github.com/CosmosOS/Cosmos/</a></li>
</ul>
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