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- /****************************************************************************
- * 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 <assert.h>
- #include <errno.h>
- #include <nuttx/addrenv.h>
- #include <nuttx/sched.h>
- #include <nuttx/mm/gran.h>
- #include <nuttx/pgalloc.h>
- #include <nuttx/mm/shm.h>
- #include "shm/shm.h"
- #ifdef CONFIG_MM_SHM
- /****************************************************************************
- * Public Data
- ****************************************************************************/
- /* State of the all shared memory */
- struct shm_info_s g_shminfo;
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: shm_initialize
- *
- * Description:
- * Perform one time, start-up initialization of the shared memory logic.
- *
- * Input Parameters:
- * None
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- void shm_initialize(void)
- {
- /* Initialize the shared memory region list */
- nxsem_init(&g_shminfo.si_sem, 0, 1);
- }
- /****************************************************************************
- * Name: shm_group_initialize
- *
- * Description:
- * Initialize the group shared memory data structures when a new task
- * group is initialized.
- *
- * Input Parameters:
- * group - A reference to the new group structure to be initialized.
- *
- * Returned Value:
- * Zero (OK) on success; a negated errno value on failure.
- *
- ****************************************************************************/
- int shm_group_initialize(FAR struct task_group_s *group)
- {
- DEBUGASSERT(group && !group->tg_shm.gs_handle);
- group->tg_shm.gs_handle =
- gran_initialize((FAR void *)CONFIG_ARCH_SHM_VBASE,
- ARCH_SHM_MAXPAGES << MM_PGSHIFT,
- MM_PGSHIFT, MM_PGSHIFT);
- if (!group->tg_shm.gs_handle)
- {
- shmerr("ERROR: gran_initialize() failed\n");
- return -ENOMEM;
- }
- return OK;
- }
- /****************************************************************************
- * Name: shm_group_release
- *
- * Description:
- * Release resources used by the group shared memory logic. This function
- * is called at the time at the group is destroyed.
- *
- * Input Parameters:
- * group - A reference to the group structure to be un-initialized.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- void shm_group_release(FAR struct task_group_s *group)
- {
- GRAN_HANDLE handle;
- DEBUGASSERT(group);
- handle = group->tg_shm.gs_handle;
- if (handle)
- {
- gran_release(handle);
- }
- }
- #endif /* CONFIG_MM_SHM */
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