145 lines
5.1 KiB
C
145 lines
5.1 KiB
C
/****************************************************************************
|
|
* mm/mm_gran/mm_granreserve.c
|
|
*
|
|
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <assert.h>
|
|
|
|
#include <nuttx/mm/gran.h>
|
|
|
|
#include "mm_gran/mm_gran.h"
|
|
|
|
#ifdef CONFIG_GRAN
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: gran_common_reserve
|
|
*
|
|
* Description:
|
|
* Reserve memory in the granule heap. This will reserve the granules
|
|
* that contain the start and end addresses plus all of the granules
|
|
* in between. This should be done early in the initialization sequence
|
|
* before any other allocations are made.
|
|
*
|
|
* Reserved memory can never be allocated (it can be freed however which
|
|
* essentially unreserves the memory).
|
|
*
|
|
* Input Parameters:
|
|
* priv - The granule heap state structure.
|
|
* start - The address of the beginning of the region to be reserved.
|
|
* size - The size of the region to be reserved
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
static inline void gran_common_reserve(FAR struct gran_s *priv,
|
|
uintptr_t start, size_t size)
|
|
{
|
|
if (size > 0)
|
|
{
|
|
uintptr_t mask = (1 << priv->log2gran) - 1;
|
|
uintptr_t end = start + size - 1;
|
|
unsigned int ngranules;
|
|
|
|
/* Get the aligned (down) start address and the aligned (up) end
|
|
* address
|
|
*/
|
|
|
|
start &= ~mask;
|
|
end = (end + mask) & ~mask;
|
|
|
|
/* Calculate the new size in granules */
|
|
|
|
ngranules = ((end - start) >> priv->log2gran) + 1;
|
|
|
|
/* And reserve the granules */
|
|
|
|
gran_mark_allocated(priv, start, ngranules);
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: gran_reserve
|
|
*
|
|
* Description:
|
|
* Reserve memory in the granule heap. This will reserve the granules
|
|
* that contain the start and end addresses plus all of the granules
|
|
* in between. This should be done early in the initialization sequence
|
|
* before any other allocations are made.
|
|
*
|
|
* Reserved memory can never be allocated (it can be freed however which
|
|
* essentially unreserves the memory).
|
|
*
|
|
* Input Parameters:
|
|
* handle - The handle previously returned by gran_initialize
|
|
* start - The address of the beginning of the region to be reserved.
|
|
* size - The size of the region to be reserved
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_GRAN_SINGLE
|
|
void gran_reserve(uintptr_t start, size_t size)
|
|
{
|
|
return gran_common_reserve(g_graninfo, start, size);
|
|
}
|
|
#else
|
|
void gran_reserve(GRAN_HANDLE handle, uintptr_t start, size_t size)
|
|
{
|
|
return gran_common_reserve((FAR struct gran_s *)handle, start, size);
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_GRAN */
|