94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/****************************************************************************
|
|
* mm/map/vm_region.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/mm/map.h>
|
|
#include <nuttx/mm/gran.h>
|
|
#include <debug.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: vm_alloc_region
|
|
*
|
|
* Description:
|
|
* Allocate virtual memory region from the process virtual memory area.
|
|
*
|
|
* Input Parameters:
|
|
* mm - A reference to the process mm_map struct
|
|
* vaddr - Virtual start address where the allocation starts, if NULL, will
|
|
* seek and return an address that satisfies the 'size' parameter
|
|
* size - Size of the area to allocate
|
|
*
|
|
* Returned Value:
|
|
* Pointer to reserved vaddr, or NULL if out-of-memory
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR void *vm_alloc_region(FAR struct mm_map_s *mm, FAR void *vaddr,
|
|
size_t size)
|
|
{
|
|
FAR void *ret = NULL;
|
|
|
|
DEBUGASSERT(mm != NULL);
|
|
|
|
if (mm->mm_map_vpages != NULL)
|
|
{
|
|
if (vaddr == NULL)
|
|
{
|
|
ret = gran_alloc(mm->mm_map_vpages, size);
|
|
}
|
|
else
|
|
{
|
|
ret = gran_reserve(mm->mm_map_vpages, (uintptr_t)vaddr, size);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: vm_release_region
|
|
*
|
|
* Description:
|
|
* Free a previously allocated virtual memory region
|
|
*
|
|
* Input Parameters:
|
|
* mm - A reference to the process' mm_map struct
|
|
* vaddr - Virtual start address where the allocation starts.
|
|
* size - Size of the allocated area.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void vm_release_region(FAR struct mm_map_s *mm, FAR void *vaddr, size_t size)
|
|
{
|
|
DEBUGASSERT(mm != NULL);
|
|
|
|
if (mm->mm_map_vpages != NULL)
|
|
{
|
|
gran_free(mm->mm_map_vpages, vaddr, size);
|
|
}
|
|
}
|