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study/sabre/os/files/ProtectedMode/DPMI1.0Spec/api/310603.html

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+<h2>Relock Real Mode Region
+<img src="../0.9.gif" alt="[0.9]" width=22 height=17></h2>
+
+Relocks a memory region that was previously declared as pageable with
+the Mark Real Mode Region as Pageable function (<a
+href="310602.html">Int 31H Function 0602H</a>).<p>
+
+<b>Call With</b><br>
+<img src="r/ax+bx+cx+si+di.gif" alt="" width=245 height=59><br>
+
+AX     = 0603H<br>
+BX:CX  = starting linear address of memory to relock<br>
+SI:DI  = size of region to relock (bytes)<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>8002H</td><td>invalid state (region not marked as
+pageable)</td></tr>
+<tr><td>8013H</td><td>physical memory unavailable</td></tr>
+<tr><td>8025H</td><td>invalid linear address (region is above 1
+MB boundary)</td></tr>
+</table>
+
+<h2>Notes</h2><ul>
+
+
+<li>If the function returns an error, none of the memory has been
+relocked.<p>
+
+<li>If the specified region overlaps part of a page at the beginning
+or end of the region, the page(s) will not be relocked.<p>
+
+<li>This function is ignored by DPMI implementations that do not
+support virtual memory; the function will return the Carry flag clear
+to indicate success, but has no other effect.  DPMI hosts which
+support virtual memory may also choose to ignore this function, but
+such hosts must be able to handle page faults transparently at
+arbitrary points during a client's execution, including within
+interrupt and exception handlers.<p>
+
+<li>If <a href="310602.html">Function 0602H</a> is implemented as a
+"no-operation" on a particular DPMI host, this function will likewise
+do nothing.  In other words, this function should not be used to lock
+memory, but only to restore the default state of the host's
+conventional memory locking.<p>
+
+</ul>
+
+