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diff --git a/libcilkrts/include/internal/metacall.h b/libcilkrts/include/internal/metacall.h
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+// -*- C++ -*-
+
+/*
+ *  @copyright
+ *  Copyright (C) 2009-2013, Intel Corporation
+ *  All rights reserved.
+ *  
+ *  @copyright
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *  
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *  
+ *  @copyright
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ *  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ *  WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ *
+ * metacall.h
+ *
+ * This is an internal header file defining part of the metacall
+ * interface used by Cilkscreen.  It is not a stable API and is
+ * subject to change without notice.
+ */
+
+// Provides the enum of metacall kinds.  This is used by Cilkscreen and the
+// runtime, and will probably be used by any future ptools.
+
+#pragma once
+
+///////////////////////////////////////////////////////////////////////////////
+
+enum
+{
+    // Notify Cilkscreen to stop/start instrumenting code
+    HYPER_DISABLE_INSTRUMENTATION = 0,
+    HYPER_ENABLE_INSTRUMENTATION = 1,
+
+    // Write 0 in *(char *)arg if the p-tool is sequential.  The Cilk runtime
+    // system invokes this metacall to know whether to spawn worker threads.
+    HYPER_ZERO_IF_SEQUENTIAL_PTOOL = 2,
+
+    // Write 0 in *(char *)arg if the runtime must force reducers to
+    // call the reduce() method even if no actual stealing occurs.
+    HYPER_ZERO_IF_FORCE_REDUCE = 3,
+
+    // Inform cilkscreen about the current stack pointer.
+    HYPER_ESTABLISH_C_STACK = 4,
+
+    // Inform Cilkscreen about the current worker
+    HYPER_ESTABLISH_WORKER = 5,
+
+    // Tell tools to ignore a block of memory.  Parameter is a 2 element
+    // array: void *block[2] = {_begin, _end};  _end is 1 beyond the end
+    // of the block to be ignored.  Essentially, if p is a pointer to an
+    // array, _begin = &p[0], _end = &p[max]
+    HYPER_IGNORE_MEMORY_BLOCK = 6
+
+    // If you add metacalls here, remember to update BOTH workspan.cpp AND
+    // cilkscreen-common.cpp!
+};
+
+typedef struct
+{
+    unsigned int tool;  // Specifies tool metacall is for
+                        // (eg. system=0, cilkscreen=1, cilkview=2).
+                        // All tools should understand system codes.
+                        // Tools should ignore all other codes, except
+                        // their own.
+
+    unsigned int code;  // Tool-specific code specifies what to do and how to
+                        // interpret data
+
+    void        *data;
+} metacall_data_t;
+
+#define METACALL_TOOL_SYSTEM 0
+
+///////////////////////////////////////////////////////////////////////////////