astructure that Operating Systems use. This infrastructure give us the security and stability we expect. Actually, most 
advanced CPUs provide a lot more options than operating systems like Linux, BSD and
Windows actually uses.</p>
<p>There is especially two that I want to address here:</p>
<ol>
<li>How the CPU prevents us from accessing memory we're not supposed to access</li>
<li>How the CPU handles asynchronous events like I/O</li>
</ol>
<p><em>We'll cover the first one here and the second in the next ch