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diff --git a/include/rtems/score/apiext.h b/include/rtems/score/apiext.h
new file mode 100644
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+++ b/include/rtems/score/apiext.h
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+/**
+ *  @file  rtems/score/apiext.h
+ *
+ *  @brief API Extensions Handler
+ *
+ *  This is the API Extensions Handler.
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2009.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _RTEMS_SCORE_APIEXT_H
+#define _RTEMS_SCORE_APIEXT_H
+
+#include <rtems/score/chainimpl.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *  @defgroup ScoreAPIExtension API Extension Handler
+ *
+ *  @ingroup Score
+ *
+ *  This handler encapsulates functionality which provides mechanisms for the
+ *  SuperCore to perform API specific actions without there beingg
+ *  "up-references" from the SuperCore to APIs.  If these referencesg
+ *  were allowed in the implementation, the cohesion would be too high
+ *  and adding an API would be more difficult.  The SuperCore is supposed
+ *  to be largely independent of any API.
+ */
+/**@{*/
+
+/**
+ *  This type defines the prototype of the Postdriver Hook.
+ */
+typedef void (*API_extensions_Postdriver_hook)(void);
+
+/**
+ *  The control structure which defines the points at which an API
+ *  can add an extension to the system initialization thread.
+ */
+typedef struct {
+  /** This field allows this structure to be used with the Chain Handler. */
+  Chain_Node                      Node;
+
+  /**
+   * This field is the callout invoked during RTEMS initialization after
+   * RTEMS data structures and device driver initialization has occurred
+   * but before multitasking is initiated.
+   *
+   * @note If this field is NULL, no extension is invoked.
+   */
+  API_extensions_Postdriver_hook  postdriver_hook;
+}  API_extensions_Control;
+
+/**
+ *  @brief Add extension set to the active set.
+ *
+ *  This routine adds @a the_extension to the active set of API extensions.
+ *
+ *  @param[in] the_extension is the extension set to add.
+ */
+void _API_extensions_Add(
+  API_extensions_Control *the_extension
+);
+
+/**
+ *  @brief Execute all post-driver extensions.
+ *
+ *  This routine executes all of the postdriver callouts.
+ */
+void _API_extensions_Run_postdriver( void );
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/* end of include file */