Cosmos/source2/Kernel/System/Cosmos.System/Kernel.cs

using System;

namespace Cosmos.System {
  // MtW: if the fullname (namespace + name) of this class changes, please also change IL2CPU msbuild task
  public abstract class Kernel {
    public readonly Debug.Kernel.Debugger Dbg = new Debug.Kernel.Debugger("User", "");

    public bool ClearScreen = true;

    // Set after initial start. Can be started and stopped at same time
    protected bool mStarted = false;
    // Set to signal stopped
    protected bool mStopped = false;

    // Start the system up using the properties for configuration.
    public void Start() {
      try {
        Global.Dbg.Send("Starting kernel");
        if (mStarted) {
          Global.Dbg.Send("ERROR: Kernel Already Started");
          throw new Exception("Kernel has already been started. A kernel cannot be started twice.");
        }
        mStarted = true;

        Global.Dbg.Send("HW Bootstrap Init");
        Hardware.Bootstrap.Init();

        Global.Dbg.Send("Global Init");
        Global.Init();

        // Provide the user with a clear screen if they requested it
        if (ClearScreen) {
          Global.Dbg.Send("Cls");
          Global.Console.Clear();
        }

        Global.Dbg.Send("Before Run");
        BeforeRun();

        Global.Dbg.Send("Run");
        while (!mStopped) {
          Network.NetworkStack.Update();
          Run();
        }

        AfterRun();
        bool xTest = 1 != 3;
        while (xTest) {
        }
      } catch (Exception E) {
        // todo: better ways to handle?
        global::System.Console.WriteLine("Exception occurred while running kernel:");
        global::System.Console.WriteLine(E.ToString());
      }
    }

    protected virtual void BeforeRun() { }
    protected abstract void Run();
    protected virtual void AfterRun() { }

    // Shut down the system and power off
    public void Stop() {
      mStopped = true;
    }

    // Shutdown and restart
    public void Restart() {
    }
  }
}