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+<h2>memory_object_data_request</h2>
+<hr>
+<p>
+<strong>Server Interface</strong> - Request that memory manager page-in specified data.
+<h3>SYNOPSIS</h3>
+<pre>
+<strong>kern_return_t   memory_object_data_request</strong>
+                <strong>(memory_object_t</strong>                  <var>memory_object</var>,
+                 <strong>memory_object_control_t</strong>         <var>memory_control</var>,
+                 <strong>vm_offset_t</strong>                             <var>offset</var>,
+                 <strong>vm_size_t</strong>                               <var>length</var>,
+                 <strong>vm_prot_t</strong>                       <var>desired_access</var><strong>);</strong>
+
+
+<strong>kern_return_t   seqnos_memory_object_data_request</strong>
+                <strong>(memory_object_t</strong>                  <var>memory_object</var>,
+                 <strong>mach_port_seqno_t</strong>                        <var>seqno</var>,
+                 <strong>memory_object_control_t</strong>         <var>memory_control</var>,
+                 <strong>vm_offset_t</strong>                             <var>offset</var>,
+                 <strong>vm_size_t</strong>                               <var>length</var>,
+                 <strong>vm_prot_t</strong>                       <var>desired_access</var><strong>);</strong>
+</pre>
+<h3>PARAMETERS</h3>
+<dl>
+<p>
+<dt> <var>memory_object</var> 
+<dd>
+[in abstract-memory-object (receive) right]
+The abstract memory
+object port that represents the memory object data.
+<p>
+<dt> <var>seqno</var> 
+<dd>
+[in scalar]
+The sequence number of this message relative to the abstract 
+memory object port.
+<p>
+<dt> <var>memory_control</var> 
+<dd>
+[in memory-cache-control send right]
+The memory cache control port 
+to be used for a response by the memory manager.  If the memory
+object has been supplied to more than one kernel, this parameter
+identifies the kernel that is making the call.
+<p>
+<dt> <var>offset</var> 
+<dd>
+[in scalar]
+The offset within the memory object.
+<p>
+<dt> <var>length</var> 
+<dd>
+[in scalar]
+The number of bytes requested, starting at <var>offset</var>.  The
+number converts to an integral number of virtual pages.
+<p>
+<dt> <var>desired_access</var> 
+<dd>
+[in scalar]
+The memory access modes to be allowed for the cached 
+data.  Possible values are obtained by or'ing together the following
+values:
+<dl>
+<p>
+<dt> <strong>VM_PROT_READ</strong>
+<dd>
+Allows read access.
+<p>
+<dt> <strong>VM_PROT_WRITE</strong>
+<dd>
+Allows write access.
+<p>
+<dt> <strong>VM_PROT_EXECUTE</strong>
+<dd>
+Allows execute access.
+</dl>
+</dl>
+<h3>DESCRIPTION</h3>
+<p>
+A <strong>memory_object_data_request</strong> function is called as
+the result of a kernel 
+message requesting data from the specified memory object, for at least the
+access specified.
+<p>
+The kernel issues this call after a cache miss (that is, a page
+fault for which the 
+kernel does not have the data).  The kernel requests only amounts
+of data that are 
+multiples of the page size included in the
+<strong>memory_object_init</strong> or <strong>memory_object_create</strong> call.
+<p>
+The memory manager is expected to use <strong>memory_object_data_supply</strong> to
+return at least the specified data, with as much access as it
+can allow.  If the
+memory manager cannot provide the data (for example, because
+of a hardware error), 
+it can use the <strong>memory_object_data_error</strong> call.  The
+memory manager can also 
+use <strong>memory_object_data_unavailable</strong> to tell the kernel
+to supply zero-filled 
+memory for the region.
+<h3>RETURN VALUES</h3>
+<p>
+Only generic errors apply.
+<h3>RELATED INFORMATION</h3>
+<p>
+Functions:
+<a href="memory_object_data_error.html"><strong>memory_object_data_error</strong></a>,
+<a href="memory_object_data_supply.html"><strong>memory_object_data_supply</strong></a>,
+<a href="MO_data_unavailable.html"><strong>memory_object_data_unavailable</strong></a>,
+<a href="memory_object_server.html"><strong>memory_object_server</strong></a>,
+<a href="SMO_server.html"><strong>seqnos_memory_object_server</strong></a>.
+