Add shared memory initializatin logic

5 files changed, 229 insertions, 7 deletions

diff --git a/nuttx/mm/mm_gran/mm_gran.h b/nuttx/mm/mm_gran/mm_gran.h
index 2156f96ef..cb9316ae4 100644
--- a/nuttx/mm/mm_gran/mm_gran.h
+++ b/nuttx/mm/mm_gran/mm_gran.h
@@ -33,8 +33,8 @@
  *
  ****************************************************************************/
 
-#ifndef __MM_MM_GRAN_MM_GRAHN_H
-#define __MM_MM_GRAN_MM_GRAHN_H
+#ifndef __MM_MM_GRAN_MM_GRAN_H
+#define __MM_MM_GRAN_MM_GRAN_H
 
 /****************************************************************************
  * Included Files
@@ -83,7 +83,7 @@
  * Public Types
  ****************************************************************************/
 
-/* This structure represents the state of on granule allocation */
+/* This structure represents the state of one granule allocation */
 
 struct gran_s
 {
@@ -148,4 +148,4 @@ void gran_leave_critical(FAR struct gran_s *priv);
 void gran_mark_allocated(FAR struct gran_s *priv, uintptr_t alloc,
                          unsigned int ngranules);
 
-#endif /* __MM_MM_GRAN_MM_GRAHN_H */
+#endif /* __MM_MM_GRAN_MM_GRAN_H */
diff --git a/nuttx/mm/shm/Make.defs b/nuttx/mm/shm/Make.defs
index c0fb12a81..f02e5864f 100644
--- a/nuttx/mm/shm/Make.defs
+++ b/nuttx/mm/shm/Make.defs
@@ -36,6 +36,7 @@
 # Shared memory allocator
 
 ifeq ($(CONFIG_MM_SHM),y)
+CSRCS += shm_initialize.c
 CSRCS += shmat.c shmctl.c shmdt.c shmget.c
 
 # Add the shared memory directory to the build
diff --git a/nuttx/mm/shm/shm.h b/nuttx/mm/shm/shm.h
new file mode 100644
index 000000000..0a05dce29
--- /dev/null
+++ b/nuttx/mm/shm/shm.h
@@ -0,0 +1,106 @@
+/****************************************************************************
+ * 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 */
diff --git a/nuttx/mm/shm/shm_initialize.c b/nuttx/mm/shm/shm_initialize.c
new file mode 100755
index 000000000..1da2d4e2e
--- /dev/null
+++ b/nuttx/mm/shm/shm_initialize.c
@@ -0,0 +1,111 @@
+/****************************************************************************
+ * mm/shm/shm_initialize.c
+ *
+ *   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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "shm/shm.h"
+
+#ifdef CONFIG_MM_SHM
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* State of the all shared memory */
+
+struct shm_info_s g_shminfo;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: shm_initialize
+ *
+ * Description:
+ *   Perform one time, start-up initialization of the shared memor logic.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void shm_initialize(void)
+{
+#if SHM_INVALID_KEY != 0
+  FAR struct shm_region_s *region;
+  int i;
+#endif
+
+  /* Initialize the shared memory region list */
+
+  sem_init(&g_shminfo.si_sem, 0, 1);
+
+#if SHM_INVALID_KEY != 0
+  /* Initialize each shared memory region */
+
+  for (i = 0; i < CONFIG_ARCH_SHM_NPAGES; i++)
+    {
+      region = &g_shminfo.si_region[i];
+
+      /* Markk the key invalid for each region.  The invalid key is an
+       * indication that the region is not in use.
+       */
+
+      region->sr_key = SHM_INVALID_KEY;
+    }
+#endif
+}
+
+#endif /* CONFIG_MM_SHM */
diff --git a/nuttx/mm/shm/shmget.c b/nuttx/mm/shm/shmget.c
index f5e718b4a..3df1dd763 100755
--- a/nuttx/mm/shm/shmget.c
+++ b/nuttx/mm/shm/shmget.c
@@ -83,9 +83,6 @@
  *   Upon creation, the data structure associated with the new shared memory
  *   identifier will be initialized as follows:
  *
- *     - The values of shm_perm.cuid, shm_perm.uid, shm_perm.cgid, and
- *       shm_perm.gid are set equal to the effective user ID and effective
- *       group ID, respectively, of the calling process.
  *     - The low-order nine bits of shm_perm.mode are set equal to the low-
  *       order nine bits of shmflg.
  *     - The value of shm_segsz is set equal to the value of size.
@@ -136,6 +133,13 @@
  *       limit on the maximum number of allowed shared memory identifiers
  *       system-wide would be exceeded.
  *
+ * POSIX Deviations:
+ *     - The values of shm_perm.cuid, shm_perm.uid, shm_perm.cgid, and
+ *       shm_perm.gid should be set equal to the effective user ID and
+ *       effective group ID, respectively, of the calling process. 
+ *       The NuttX ipc_perm structure, however, does not support these
+ *       fields because user and group IDs are not yet supported by NuttX.
+ *
  ****************************************************************************/
 
 int shmget(key_t key, size_t size, int shmflg)