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/*
* Copyright (c) 1996 The University of Utah and
* the Computer Systems Laboratory at the University of Utah (CSL).
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software is hereby
* granted provided that (1) source code retains these copyright, permission,
* and disclaimer notices, and (2) redistributions including binaries
* reproduce the notices in supporting documentation, and (3) all advertising
* materials mentioning features or use of this software display the following
* acknowledgement: ``This product includes software developed by the
* Computer Systems Laboratory at the University of Utah.''
*
* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* CSL requests users of this software to return to csl-dist@cs.utah.edu any
* improvements that they make and grant CSL redistribution rights.
*/
#include <stddef.h>
#include "malloc_internal.h"
void *_memalign(size_t alignment, size_t size)
{
unsigned shift;
size_t *chunk;
/* Find the alignment shift in bits. XXX use proc_ops.h */
for (shift = 0; (1 << shift) < alignment; shift++);
/*
* Allocate a chunk of LMM memory with the specified alignment shift
* and an offset such that the memory block we return will be aligned
* after we add our size field to the beginning of it.
*/
size += sizeof(size_t);
malloc_lmm_begin();
chunk = lmm_alloc_aligned(&malloc_lmm, size, 0, shift,
(1 << shift) - sizeof(size_t));
malloc_lmm_end();
if (!chunk)
return NULL;
*chunk = size;
return chunk+1;
}
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