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* Copyright (c) 2001-2004 Jakub Jermar
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* Copyright (c) 2008 Jiri Svoboda
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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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* - 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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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/** @addtogroup generic
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* @brief Memory string operations.
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* This file provides architecture independent functions to manipulate blocks of
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* memory. These functions are optimized as much as generic functions of this
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* type can be. However, architectures are free to provide even more optimized
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* versions of these functions.
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#include <arch/types.h>
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/** Copy block of memory.
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* Copy cnt bytes from src address to dst address. The copying is done
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* word-by-word and then byte-by-byte. The source and destination memory areas
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* @param src Source address to copy from.
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* @param dst Destination address to copy to.
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* @param cnt Number of bytes to copy.
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* @return Destination address.
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void *_memcpy(void *dst, const void *src, size_t cnt)
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if (ALIGN_UP((uintptr_t) src, sizeof(unative_t)) != (uintptr_t) src ||
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ALIGN_UP((uintptr_t) dst, sizeof(unative_t)) != (uintptr_t) dst) {
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for (i = 0; i < cnt; i++)
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((uint8_t *) dst)[i] = ((uint8_t *) src)[i];
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for (i = 0; i < cnt / sizeof(unative_t); i++)
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((unative_t *) dst)[i] = ((unative_t *) src)[i];
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for (j = 0; j < cnt % sizeof(unative_t); j++)
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((uint8_t *)(((unative_t *) dst) + i))[j] =
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((uint8_t *)(((unative_t *) src) + i))[j];
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/** Move memory block with possible overlapping.
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* Copy cnt bytes from src address to dst address. The source and destination
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* memory areas may overlap.
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* @param src Source address to copy from.
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* @param dst Destination address to copy to.
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* @param cnt Number of bytes to copy.
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* @return Destination address.
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void *memmove(void *dst, const void *src, size_t n)
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/* Non-overlapping? */
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if (dst >= src + n || src >= dst + n) {
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return memcpy(dst, src, n);
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/* Which direction? */
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/** Fill block of memory
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* Fill cnt bytes at dst address with the value x. The filling is done
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* @param dst Destination address to fill.
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* @param cnt Number of bytes to fill.
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* @param x Value to fill.
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void _memsetb(void *dst, size_t cnt, uint8_t x)
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uint8_t *p = (uint8_t *) dst;
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for (i = 0; i < cnt; i++)
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/** Fill block of memory.
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* Fill cnt words at dst address with the value x. The filling is done
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* @param dst Destination address to fill.
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* @param cnt Number of words to fill.
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* @param x Value to fill.
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void _memsetw(void *dst, size_t cnt, uint16_t x)
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uint16_t *p = (uint16_t *) dst;
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for (i = 0; i < cnt; i++)