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diff --git a/nuttx/mm/shm/shm.h b/nuttx/mm/shm/shm.h
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+/****************************************************************************
+ * mm/shm/shm.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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 OWNER 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.
+ *
+ ****************************************************************************/
+
+#ifndef __MM_SHM_SHM_H
+#define __MM_SHM_SHM_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <stdint.h>
+#include <semaphore.h>
+
+#include <nuttx/addrenv.h>
+
+#ifdef CONFIG_MM_SHM
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* IPC_PRIVATE is the only value for the the SHM key that is guaranteed to
+ * be invalid.
+ */
+
+#define SHM_INVALID_KEY IPC_PRIVATE
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* This structure represents the state of one shared memory region
+ * allocation.  Cast compatible with struct shmid_ds.
+ */
+
+struct shm_region_s
+{
+  struct shmid_ds sr_ds; /* Region info */
+  key_t sr_key;          /* Lookup key.  IPC_PRIVATE means unused */
+  sem_t sr_sem;          /* Manages exclusive access to this region */
+
+  /* List of physical pages allocated for this memory region */
+
+  uintptr_t sr_pages[CONFIG_ARCH_SHM_NPAGES];
+};
+
+/* This structure represents the set of all shared memory regions.
+ * Access to the region 
+ */
+
+struct shm_info_s
+{
+  sem_t si_sem;         /* Manages exclusive access to the region list */
+  struct shm_region_s si_region[CONFIG_ARCH_SHM_MAXREGIONS];
+};
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* State of the all shared memory */
+
+extern struct shm_info_s g_shminfo;
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#endif /* CONFIG_MM_SHM */
+#endif /* __MM_SHM_SHM_H */