144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/****************************************************************************
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* fs/shm/shmfs_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 <stdbool.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/pgalloc.h>
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#include "shm/shmfs.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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FAR struct shmfs_object_s *shmfs_alloc_object(size_t length)
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{
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FAR struct shmfs_object_s *object;
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bool allocated = false;
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#if defined(CONFIG_BUILD_FLAT)
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/* in FLAT build, allocate the object metadata and the data in the same
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* chunk in kernel heap
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*/
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object = kmm_zalloc(sizeof(struct shmfs_object_s) + length);
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if (object)
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{
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object->paddr = (FAR char *)(object + 1);
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allocated = true;
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}
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#elif defined(CONFIG_BUILD_PROTECTED)
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/* in PROTECTED build, allocate the shm object in kernel heap, and shared
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* memory in user heap
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*/
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object = kmm_zalloc(sizeof(struct shmfs_object_s));
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if (object)
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{
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object->paddr = kumm_zalloc(length);
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if (object->paddr)
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{
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allocated = true;
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}
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}
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#elif defined(CONFIG_BUILD_KERNEL)
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/* in KERNEL build, allocate the shared memory from page pool and store the
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* physical address
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*/
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size_t i = 0;
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FAR void **pages;
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size_t n_pages = MM_NPAGES(length);
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object = kmm_zalloc(sizeof(struct shmfs_object_s) +
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(n_pages - 1) * sizeof(object->paddr));
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if (object)
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{
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pages = &object->paddr;
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for (; i < n_pages; i++)
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{
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pages[i] = (FAR void *)mm_pgalloc(1);
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if (!pages[i])
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{
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break;
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}
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}
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}
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if (i == n_pages)
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{
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allocated = true;
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}
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#endif
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if (allocated)
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{
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object->length = length;
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}
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else
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{
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/* delete any partial allocation */
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shmfs_free_object(object);
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object = NULL;
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}
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return object;
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}
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void shmfs_free_object(FAR struct shmfs_object_s *object)
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{
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#if defined(CONFIG_BUILD_KERNEL)
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size_t i;
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size_t n_pages = MM_NPAGES(object->length);
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FAR void **pages;
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#endif
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if (object)
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{
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#if defined (CONFIG_BUILD_PROTECTED)
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kumm_free(object->paddr);
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#elif defined(CONFIG_BUILD_KERNEL)
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pages = &object->paddr;
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for (i = 0; i < n_pages; i++)
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{
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if (pages[i])
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{
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mm_pgfree((uintptr_t)pages[i], 1);
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}
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}
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#endif
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/* Delete the object metadata
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* (and the shared memory in case of FLAT build)
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*/
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kmm_free(object);
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}
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}
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