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diff --git a/c/src/exec/score/inline/isr.inl b/c/src/exec/score/inline/isr.inl
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+++ b/c/src/exec/score/inline/isr.inl
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+/*  isr.inl
+ *
+ *  This include file contains the static implementation of all
+ *  inlined routines in the Interrupt Handler.
+ *
+ *  COPYRIGHT (c) 1989-1997.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may in
+ *  the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#ifndef __ISR_inl
+#define __ISR_inl
+
+/*PAGE
+ *
+ *  _ISR_Is_in_progress
+ *
+ *  DESCRIPTION:
+ *
+ *  This function returns TRUE if the processor is currently servicing
+ *  and interrupt and FALSE otherwise.   A return value of TRUE indicates
+ *  that the caller is an interrupt service routine, NOT a thread.  The
+ *  directives available to an interrupt service routine are restricted.
+ */
+
+RTEMS_INLINE_ROUTINE boolean _ISR_Is_in_progress( void )
+{
+  return (_ISR_Nest_level != 0);
+}
+
+/*PAGE
+ *
+ *  _ISR_Is_vector_number_valid
+ *
+ *  DESCRIPTION:
+ *
+ *  This function returns TRUE if the vector is a valid vector number
+ *  for this processor and FALSE otherwise.
+ */
+
+RTEMS_INLINE_ROUTINE boolean _ISR_Is_vector_number_valid (
+  unsigned32 vector
+)
+{
+  return ( vector <= CPU_INTERRUPT_MAXIMUM_VECTOR_NUMBER );
+}
+
+/*PAGE
+ *
+ *  _ISR_Is_valid_user_handler
+ *
+ *
+ *  DESCRIPTION:
+ *
+ *  This function returns TRUE if handler is the entry point of a valid
+ *  use interrupt service routine and FALSE otherwise.
+ */
+
+RTEMS_INLINE_ROUTINE boolean _ISR_Is_valid_user_handler (
+  void *handler
+)
+{
+  return ( handler != NULL);
+}
+
+#endif
+/* end of include file */