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diff --git a/cpukit/sapi/include/rtems/extension.h b/cpukit/sapi/include/rtems/extension.h
new file mode 100644
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+++ b/cpukit/sapi/include/rtems/extension.h
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+/*  extension.h
+ *
+ *  This include file contains all the constants, structures, and
+ *  prototypes associated with the User Extension Manager.  This manager
+ *  provides a mechanism for manipulating sets of user-defined extensions.
+ *
+ *  Directives provided are:
+ *
+ *     + create user extension set
+ *     + get ID of user extension set
+ *     + delete user extension set
+ *
+ *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
+ *  On-Line Applications Research Corporation (OAR).
+ *  All rights assigned to U.S. Government, 1994.
+ *
+ *  This material may be reproduced by or for the U.S. Government pursuant
+ *  to the copyright license under the clause at DFARS 252.227-7013.  This
+ *  notice must appear in all copies of this file and its derivatives.
+ *
+ *  $Id$
+ */
+
+#ifndef __RTEMS_EXTENSION_MANAGER_h
+#define __RTEMS_EXTENSION_MANAGER_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rtems/object.h>
+#include <rtems/userext.h>
+
+/*
+ *  The following defines the information control block used to manage
+ *  this class of objects.
+ */
+
+EXTERN Objects_Information  _Extension_Information;
+
+/*
+ *  The following records define the control block used to manage
+ *  each extension.
+ */
+
+typedef struct {
+  Objects_Control          Object;
+  User_extensions_Control  Extension;
+}   Extension_Control;
+
+/*
+ *  _Extension_Manager_initialization
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine performs the initialization necessary for this manager.
+ */
+
+void _Extension_Manager_initialization(
+  unsigned32 maximum_extensions
+);
+
+/*
+ *  rtems_extension_create
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine implements the rtems_extension_create directive.  The
+ *  extension will have the name name.   The entry points of the
+ *  routines which constitute this extension set are in EXTENSION_TABLE.
+ *  It returns the id of the created extension in ID.
+ */
+
+rtems_status_code rtems_extension_create(
+  Objects_Name                   name,
+  rtems_extensions_table *extension_table,
+  Objects_Id                    *id
+);
+
+/*
+ *  rtems_extension_ident
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine implements the rtems_extension_ident directive.
+ *  This directive returns the extension ID associated with name.
+ *  If more than one extension is named name, then the extension
+ *  to which the ID belongs is arbitrary.
+ */
+
+rtems_status_code rtems_extension_ident(
+  Objects_Name  name,
+  Objects_Id   *id
+);
+
+/*
+ *  rtems_extension_delete
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine implements the rtems_extension_delete directive.  The
+ *  extension indicated by ID is deleted.
+ */
+
+rtems_status_code rtems_extension_delete(
+  Objects_Id id
+);
+
+/*
+ *  _Extension_Allocate
+ *
+ *  DESCRIPTION:
+ *
+ *  This function allocates a extension control block from
+ *  the inactive chain of free extension control blocks.
+ */
+
+STATIC INLINE Extension_Control *_Extension_Allocate( void );
+
+/*
+ *  _Extension_Free
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine frees a extension control block to the
+ *  inactive chain of free extension control blocks.
+ */
+
+STATIC INLINE void _Extension_Free (
+  Extension_Control *the_extension
+);
+
+/*
+ *  _Extension_Get
+ *
+ *  DESCRIPTION:
+ *
+ *  This function maps extension IDs to extension control blocks.
+ *  If ID corresponds to a local extension, then it returns
+ *  the extension control pointer which maps to ID and location
+ *  is set to OBJECTS_LOCAL.  Otherwise, location is set
+ *  to OBJECTS_ERROR and the returned value is undefined.
+ */
+
+STATIC INLINE Extension_Control *_Extension_Get (
+  Objects_Id         id,
+  Objects_Locations *location
+);
+
+/*
+ *  _Extension_Is_null
+ *
+ *  DESCRIPTION:
+ *
+ *  This function returns TRUE if the_extension is NULL and FALSE otherwise.
+ */
+
+STATIC INLINE boolean _Extension_Is_null(
+  Extension_Control *the_extension
+);
+
+#include <rtems/extension.inl>
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/* end of include file */