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study/sabre/os/files/ProtectedMode/DPMI1.0Spec/api/310213.html

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+
+
+<h2>Set Extended Processor Exception Handler Vector (Real Mode)
+<img src="../1.0.gif" alt="[1.0]" width=22 height=17></h2>
+
+Sets the address of the client's protected mode handler for the
+specified real mode exception.<p>
+
+<b>Call With</b><br>
+<img src="r/ax+bl+cx+edx.gif" alt="" width=245 height=59><br>
+
+AX     = 0213H<br>
+BL     = exception/fault number (00H-1FH)<br>
+CX:(E)DX = selector:offset of exception handler<p>
+
+<b>Returns</b><br>
+<img src="r/ax+c.gif" alt="" width=245 height=59><br>
+
+<i>if function successful</i><br>
+Carry flag = clear<p>
+
+<i>if function unsuccessful</i><br>
+Carry flag = set<br>
+AX     = <a href="errors.html">error code</a>
+
+<table border=1 cellspacing=0 cellpadding=4>
+<tr><td>8021H</td><td>invalid value (BL not in range 00H-1FH)</td></tr>
+<tr><td>8022H</td><td>invalid selector</td></tr>
+</table>
+
+<h2>Notes</h2>
+
+<ul>
+
+<li>CX:(E)DX does not specify a real-mode segment:offset.  The reason
+is that this function allows a client to set the address of an
+exception handler which will receive control in protected mode when
+the specified exception occurs in real mode (i.e. the host will
+provide an implied mode switch for the purposes of servicing the
+exception, then return to real mode after the handler exits). <p>
+
+<li>Real mode exceptions are sent to the primary client of the virtual
+machine. (See Appendix A: Glossary for definition of primary
+client.)<p>
+
+<li>Refer to the rules for descriptor usage in <a href="../descriptor-rules.html">Appendix D</a>.
+
+</ul>
+
+