229 lines
8.5 KiB
C
229 lines
8.5 KiB
C
/****************************************************************************
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* mm/mm_graninit.c
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*
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* Copyright (C) 2012 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 <assert.h>
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#include <errno.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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* Public Data
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****************************************************************************/
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/* State of the single GRAN allocator */
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#ifdef CONFIG_GRAN_SINGLE
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FAR struct gran_s *g_graninfo;
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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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* Name: gran_common_initialize
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*
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* Description:
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* Perfrom common GRAN initialization.
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*
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* Input Parameters:
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* heapstart - Start of the granule allocation heap
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* heapsize - Size of heap in bytes
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* log2gran - Log base 2 of the size of one granule. 0->1 byte,
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* 1->2 bytes, 2->4 bytes, 3-> 8 bytes, etc.
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* log2align - Log base 2 of required alignment. 0->1 byte,
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* 1->2 bytes, 2->4 bytes, 3-> 8 bytes, etc. Note that
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* log2gran must be greater than or equal to log2align
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* so that all contiguous granules in memory will meet
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* the minimum alignment requirement. A value of zero
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* would mean that no alignment is required.
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*
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* Returned Value:
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* On success, a non-NULL info structure is returned that may be used with
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* other granule allocator interfaces.
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*
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****************************************************************************/
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static inline FAR struct gran_s *
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gran_common_initialize(FAR void *heapstart, size_t heapsize, uint8_t log2gran,
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uint8_t log2align)
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{
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FAR struct gran_s *priv;
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uintptr_t heapend;
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uintptr_t alignedstart;
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unsigned int mask;
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unsigned int alignedsize;
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unsigned int ngranules;
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/* Check parameters if debug is on. Note the size of a granual is
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* limited to 2**31 bytes and that the size of the granule must be greater
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* than the alignment size.
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*/
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DEBUGASSERT(heapstart && heapsize > 0 &&
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log2gran > 0 && log2gran < 32 &&
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log2gran > log2align);
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/* Get the aligned start of the heap */
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mask = (1 << log2align) - 1;
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alignedstart = ((uintptr_t)heapstart + mask) & ~mask;
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/* Determine the number of granules */
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mask = (1 << log2gran) - 1;
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heapend = (uintptr_t)heapstart + heapsize;
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alignedsize = (heapend - alignedstart) & ~mask;
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ngranules = alignedsize >> log2gran;
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/* Allocate the information structure with a granule table of the
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* correct size.
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*/
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priv = ( FAR struct gran_s *)zalloc(SIZEOF_GRAN_S(ngranules));
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if (priv)
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{
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/* Initialize non-zero elements of the granules heap info structure */
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priv->log2gran = log2gran;
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priv->ngranules = ngranules;
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priv->heapstart = alignedstart;
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/* Initialize mutual exclusion support */
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#ifndef CONFIG_GRAN_INTR
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sem_init(&priv->exclsem, 0, 1);
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#endif
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}
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return priv;
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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_initialize
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*
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* Description:
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* Set up one granule allocator instance. Allocations will be aligned to
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* the alignment size (log2align; allocations will be in units of the
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* granule size (log2gran). Larger granules will give better performance
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* and less overhead but more losses of memory due to quantization waste.
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* Additional memory waste can occur from alignment; log2align should be
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* set to 0 unless you are using the granule allocator to manage DMA memory
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* and your hardware has specific memory alignment requirements.
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*
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* Geneneral Usage Summary. This is an example using the GCC section
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* attribute to position a DMA heap in memory (logic in the linker script
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* would assign the section .dmaheap to the DMA memory.
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*
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* FAR uint32_t g_dmaheap[DMAHEAP_SIZE] __attribute__((section(.dmaheap)));
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*
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* The heap is created by calling gran_initialize(). Here the granual size
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* is set to 64 bytes (2**6) and the alignment to 16 bytes (2**4):
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*
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* GRAN_HANDLE handle = gran_initialize(g_dmaheap, DMAHEAP_SIZE, 6, 4);
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*
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* Then the GRAN_HANDLE can be used to allocate memory (There is no
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* GRAN_HANDLE if CONFIG_GRAN_SINGLE=y):
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*
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* FAR uint8_t *dma_memory = (FAR uint8_t *)gran_alloc(handle, 47);
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*
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* The actual memory allocates will be 64 byte (wasting 17 bytes) and
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* will be aligned at least to (1 << log2align).
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*
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* NOTE: The current implementation also restricts the maximum allocation
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* size to 32 granules. That restriction could be eliminated with some
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* additional coding effort.
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*
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* Input Parameters:
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* heapstart - Start of the granule allocation heap
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* heapsize - Size of heap in bytes
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* log2gran - Log base 2 of the size of one granule. 0->1 byte,
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* 1->2 bytes, 2->4 bytes, 3-> 8 bytes, etc.
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* log2align - Log base 2 of required alignment. 0->1 byte,
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* 1->2 bytes, 2->4 bytes, 3-> 8 bytes, etc. Note that
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* log2gran must be greater than or equal to log2align
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* so that all contiguous granules in memory will meet
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* the minimum alignment requirement. A value of zero
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* would mean that no alignment is required.
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*
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* Returned Value:
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* On success, a non-NULL handle is returned that may be used with other
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* granual allocator interfaces.
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*
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****************************************************************************/
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#ifdef CONFIG_GRAN_SINGLE
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int gran_initialize(FAR void *heapstart, size_t heapsize, uint8_t log2gran,
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uint8_t log2align)
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{
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g_graninfo = gran_common_initialize(heapstart, heapsize, log2gran,
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log2align);
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if (!g_graninfo)
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{
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return -ENOMEM;
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}
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return OK;
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}
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#else
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GRAN_HANDLE gran_initialize(FAR void *heapstart, size_t heapsize,
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uint8_t log2gran, uint8_t log2align)
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{
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return (GRAN_HANDLE)gran_common_initialize(heapstart, heapsize,
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log2gran, log2align);
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}
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#endif
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#endif /* CONFIG_GRAN */
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