96 lines
3.8 KiB
C
96 lines
3.8 KiB
C
/****************************************************************************
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* mm/umm_memalign.c
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*
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* Copyright (C) 2007, 2009, 2011, 2013-2014 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 <stdlib.h>
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#include <nuttx/mm.h>
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#if !defined(CONFIG_BUILD_PROTECTED) || !defined(__KERNEL__)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
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/* In the kernel build, there a multiple user heaps; one for each task
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* group. In this build configuration, the user heap structure lies
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* in a reserved region at the beginning of the .bss/.data address
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* space (CONFIG_ARCH_DATA_VBASE). The size of that region is given by
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* ARCH_DATA_RESERVE_SIZE
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*/
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# include <nuttx/addrenv.h>
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# define USR_HEAP (&ARCH_DATA_RESERVE->ar_usrheap)
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#else
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/* Otherwise, the user heap data structures are in common .bss */
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# define USR_HEAP &g_mmheap
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#endif
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/****************************************************************************
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* Private Functions
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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: memalign
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*
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* Description:
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* memalign requests more than enough space from malloc, finds a region
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* within that chunk that meets the alignment request and then frees any
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* leading or trailing space.
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*
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* The alignment argument must be a power of two (not checked). 8-byte
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* alignment is guaranteed by normal malloc calls.
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*
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****************************************************************************/
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FAR void *memalign(size_t alignment, size_t size)
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{
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return mm_memalign(USR_HEAP, alignment, size);
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}
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#endif /* !CONFIG_BUILD_PROTECTED || !__KERNEL__ */
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