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