 Exceptions</h2>
<table class="exception-table">
<tr>
<td>#GP(0)</td>
<td>
<p>If the current privilege level is not 0.</p>
<p>If an attempt is made to write invalid bit combinations in CR0 (such as setting the PG flag to 1 when the PE flag is set to 0, or setting the CD flag to 0 when the NW flag is set to 1).</p>
<p>If an attempt is made to change CR4.PCIDE from 0 to 1 while CR3[11:0] ≠ 000H.</p>
<p>If an attempt is made to clear CR0.PG[bit 31].</p>
<p>If an attempt is made to write a 1 to any reserved b