 the primary allocator.</td></tr>
<tr><td><code>fn init_backup(backup_start: usize, backup_size: usize)</code></td><td>Initialize the memory region of the backup allocator.</td></tr>
</tbody></table>
</div>
<h1 id="initialization"><a class="header" href="#initialization">Initialization</a></h1>
<h2 id="x86_64"><a class="header" href="#x86_64">x86_64</a></h2>
<p>For x86_64, the primary and backup allocators are initialized
in <code>init_primary_heap</code> and <code>init_backup_heap</code> functions defined 