95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
/****************************************************************************
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* mm/map/vm_region.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/mm/map.h>
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#include <nuttx/mm/gran.h>
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#include <debug.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: vm_alloc_region
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*
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* Description:
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* Allocate virtual memory region from the process virtual memory area.
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*
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* Input Parameters:
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* mm - A reference to the process mm_map struct
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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 *vm_alloc_region(FAR struct mm_map_s *mm, 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(mm != NULL);
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if (mm->mm_map_vpages != NULL)
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{
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if (vaddr == NULL)
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{
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ret = gran_alloc(mm->mm_map_vpages, size);
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}
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else
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{
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ret = gran_reserve(mm->mm_map_vpages, (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: vm_release_region
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*
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* Description:
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* Free a previously allocated virtual memory region
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*
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* Input Parameters:
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* mm - A reference to the process' mm_map struct
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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 vm_release_region(FAR struct mm_map_s *mm, FAR void *vaddr, size_t size)
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{
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DEBUGASSERT(mm != NULL);
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if (mm->mm_map_vpages != NULL)
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{
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gran_free(mm->mm_map_vpages, vaddr, size);
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}
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}
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