116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/****************************************************************************
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* mm/shm/shm_initialize.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/addrenv.h>
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#include <nuttx/sched.h>
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#include <nuttx/mm/gran.h>
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#include <nuttx/pgalloc.h>
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#include <nuttx/mm/shm.h>
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#include "shm/shm.h"
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#ifdef CONFIG_MM_SHM
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* State of the all shared memory */
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struct shm_info_s g_shminfo =
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{
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SEM_INITIALIZER(1)
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: shm_group_initialize
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*
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* Description:
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* Initialize the group shared memory data structures when a new task
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* group is initialized.
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*
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* Input Parameters:
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* group - A reference to the new group structure to be initialized.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int shm_group_initialize(FAR struct task_group_s *group)
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{
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DEBUGASSERT(group && !group->tg_shm.gs_handle);
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group->tg_shm.gs_handle =
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gran_initialize((FAR void *)CONFIG_ARCH_SHM_VBASE,
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ARCH_SHM_MAXPAGES << MM_PGSHIFT,
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MM_PGSHIFT, MM_PGSHIFT);
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if (!group->tg_shm.gs_handle)
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{
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shmerr("ERROR: gran_initialize() failed\n");
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return -ENOMEM;
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}
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return OK;
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}
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/****************************************************************************
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* Name: shm_group_release
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*
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* Description:
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* Release resources used by the group shared memory logic. This function
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* is called at the time at the group is destroyed.
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*
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* Input Parameters:
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* group - A reference to the group structure to be un-initialized.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void shm_group_release(FAR struct task_group_s *group)
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{
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GRAN_HANDLE handle;
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DEBUGASSERT(group);
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handle = group->tg_shm.gs_handle;
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if (handle)
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{
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gran_release(handle);
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}
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}
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#endif /* CONFIG_MM_SHM */
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