48b9a8d6f4
This will allow changing the underlying backend, i.e. granule allocator, to something more efficient, if this is needed later. Also, it gives easier access to the common SHM book keeping.
110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/****************************************************************************
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* mm/shm/shm_alloc.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 <debug.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 Functions
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****************************************************************************/
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/****************************************************************************
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* Name: shm_alloc
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*
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* Description:
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* Allocate virtual memory region from the shared memory pool.
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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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* vaddr - Virtual start address where the allocation starts, if NULL, will
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* seek and return an address that satisfies the 'size' parameter
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* size - Size of the area to allocate
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*
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* Returned Value:
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* Pointer to reserved vaddr, or NULL if out-of-memory
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*
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****************************************************************************/
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FAR void *shm_alloc(FAR struct task_group_s *group, FAR void *vaddr,
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size_t size)
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{
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FAR void *ret = NULL;
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DEBUGASSERT(group != NULL);
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if (group->tg_shm.gs_handle != NULL)
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{
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if (vaddr == NULL)
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{
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ret = gran_alloc(group->tg_shm.gs_handle, size);
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}
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else
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{
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ret = gran_reserve(group->tg_shm.gs_handle, (uintptr_t)vaddr,
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size);
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}
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}
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return ret;
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}
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/****************************************************************************
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* Name: shm_free
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*
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* Description:
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* Free a previously allocated virtual memory region back to the shared
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* memory pool.
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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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* vaddr - Virtual start address where the allocation starts.
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* size - Size of the allocated area.
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*
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****************************************************************************/
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void shm_free(FAR struct task_group_s *group, FAR void *vaddr, size_t size)
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{
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DEBUGASSERT(group != NULL);
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if (group->tg_shm.gs_handle != NULL)
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{
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gran_free(group->tg_shm.gs_handle, vaddr, size);
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}
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}
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#endif /* CONFIG_MM_SHM */
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