title: hardware mechanisms
body: <p>The operating system requires hardware support to fulfil some of its functions.
  Can you give me three examples of hardware mechanisms, which can be provided in a modern computer system to support operating system.</p>
  
  <p>================== my attempt was as below:=======================
  Hardaware security, hardware protection, hardware access mechanisms.</p>
  
  <p>Am I right?</p>