125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/****************************************************************************
|
|
* mm/mm_gran/mm_granmark.c
|
|
*
|
|
* Copyright (C) 2012, 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
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: gran_mark_allocated
|
|
*
|
|
* Description:
|
|
* Mark a range of granules as allocated.
|
|
*
|
|
* Input Parameters:
|
|
* priv - The granule heap state structure.
|
|
* alloc - The address of the allocation.
|
|
* ngranules - The number of granules allocated
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void gran_mark_allocated(FAR struct gran_s *priv, uintptr_t alloc,
|
|
unsigned int ngranules)
|
|
{
|
|
unsigned int granno;
|
|
unsigned int gatidx;
|
|
unsigned int gatbit;
|
|
unsigned int avail;
|
|
uint32_t gatmask;
|
|
|
|
/* Determine the granule number of the allocation */
|
|
|
|
granno = (alloc - priv->heapstart) >> priv->log2gran;
|
|
|
|
/* Determine the GAT table index associated with the allocation */
|
|
|
|
gatidx = granno >> 5;
|
|
gatbit = granno & 31;
|
|
|
|
/* Mark bits in the GAT entry or entries */
|
|
|
|
avail = 32 - gatbit;
|
|
if (ngranules > avail)
|
|
{
|
|
/* Mark bits in the first GAT entry */
|
|
|
|
gatmask = 0xffffffff << gatbit;
|
|
DEBUGASSERT((priv->gat[gatidx] & gatmask) == 0);
|
|
|
|
priv->gat[gatidx] |= gatmask;
|
|
ngranules -= avail;
|
|
|
|
/* Mark bits in the second GAT entry */
|
|
|
|
gatmask = 0xffffffff >> (32 - ngranules);
|
|
DEBUGASSERT((priv->gat[gatidx + 1] & gatmask) == 0);
|
|
|
|
priv->gat[gatidx + 1] |= gatmask;
|
|
}
|
|
|
|
/* Handle the case where where all of the granules come from one entry */
|
|
|
|
else
|
|
{
|
|
/* Mark bits in a single GAT entry */
|
|
|
|
gatmask = 0xffffffff >> (32 - ngranules);
|
|
gatmask <<= gatbit;
|
|
DEBUGASSERT((priv->gat[gatidx] & gatmask) == 0);
|
|
|
|
priv->gat[gatidx] |= gatmask;
|
|
return;
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_GRAN */
|