123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170 |
- /****************************************************************************
- * mm/mm_gran/mm_granfree.c
- *
- * Copyright (C) 2012 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
- ****************************************************************************/
- /****************************************************************************
- * Name: gran_common_free
- *
- * Description:
- * Return memory to the granule heap.
- *
- * Input Parameters:
- * handle - The handle previously returned by gran_initialize
- * memory - A pointer to memory previoiusly allocated by gran_alloc.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- static inline void gran_common_free(FAR struct gran_s *priv,
- FAR void *memory, size_t size)
- {
- unsigned int granno;
- unsigned int gatidx;
- unsigned int gatbit;
- unsigned int granmask;
- unsigned int ngranules;
- unsigned int avail;
- uint32_t gatmask;
- DEBUGASSERT(priv && memory && size <= 32 * (1 << priv->log2gran));
- /* Get exclusive access to the GAT */
- gran_enter_critical(priv);
- /* Determine the granule number of the first granule in the allocation */
- granno = ((uintptr_t)memory - priv->heapstart) >> priv->log2gran;
- /* Determine the GAT table index and bit number associated with the
- * allocation.
- */
- gatidx = granno >> 5;
- gatbit = granno & 31;
- /* Determine the number of granules in the allocation */
- granmask = (1 << priv->log2gran) - 1;
- ngranules = (size + granmask) >> priv->log2gran;
- /* Clear bits in the GAT entry or entries */
- avail = 32 - gatbit;
- if (ngranules > avail)
- {
- /* Clear bits in the first GAT entry */
- gatmask = (0xffffffff << gatbit);
- DEBUGASSERT((priv->gat[gatidx] & gatmask) == gatmask);
- priv->gat[gatidx] &= ~gatmask;
- ngranules -= avail;
- /* Clear bits in the second GAT entry */
- gatmask = 0xffffffff >> (32 - ngranules);
- DEBUGASSERT((priv->gat[gatidx+1] & gatmask) == gatmask);
- priv->gat[gatidx+1] &= ~gatmask;
- }
- /* Handle the case where where all of the granules came from one entry */
- else
- {
- /* Clear bits in a single GAT entry */
- gatmask = 0xffffffff >> (32 - ngranules);
- gatmask <<= gatbit;
- DEBUGASSERT((priv->gat[gatidx] & gatmask) == gatmask);
- priv->gat[gatidx] &= ~gatmask;
- }
- gran_leave_critical(priv);
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: gran_free
- *
- * Description:
- * Return memory to the granule heap.
- *
- * Input Parameters:
- * handle - The handle previously returned by gran_initialize
- * memory - A pointer to memory previoiusly allocated by gran_alloc.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- #ifdef CONFIG_GRAN_SINGLE
- void gran_free(FAR void *memory, size_t size)
- {
- return gran_common_free(g_graninfo, memory, size);
- }
- #else
- void gran_free(GRAN_HANDLE handle, FAR void *memory, size_t size)
- {
- return gran_common_free((FAR struct gran_s *)handle, memory, size);
- }
- #endif
- #endif /* CONFIG_GRAN */
|