/*
* Copyright (C) 2001-2004 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup generic
* @{
*/
/**
* @file
* @brief Memory string operations.
*
* This file provides architecture independent functions
* to manipulate blocks of memory. These functions
* are optimized as much as generic functions of
* this type can be. However, architectures are
* free to provide even more optimized versions of these
* functions.
*/
#include <memstr.h>
#include <arch/types.h>
#include <align.h>
/** Copy block of memory
*
* Copy cnt bytes from src address to dst address.
* The copying is done word-by-word and then byte-by-byte.
* The source and destination memory areas cannot overlap.
*
* @param src Origin address to copy from.
* @param dst Origin address to copy to.
* @param cnt Number of bytes to copy.
*
*/
void *_memcpy(void * dst, const void *src, size_t cnt)
{
int i, j;
if (ALIGN_UP((uintptr_t) src, sizeof(unative_t)) != (uintptr_t) src ||
ALIGN_UP((uintptr_t) dst, sizeof(unative_t)) != (uintptr_t) dst) {
for (i = 0; i < cnt; i++)
((uint8_t *) dst)[i] = ((uint8_t *) src)[i];
} else {
for (i = 0; i < cnt/sizeof(unative_t); i++)
((unative_t *) dst)[i] = ((unative_t *) src)[i];
for (j = 0; j < cnt%sizeof(unative_t); j++)
((uint8_t *)(((unative_t *) dst) + i))[j] = ((uint8_t *)(((unative_t *) src) + i))[j];
}
return (char *)src;
}
/** Fill block of memory
*
* Fill cnt bytes at dst address with the value x.
* The filling is done byte-by-byte.
*
* @param dst Origin address to fill.
* @param cnt Number of bytes to fill.
* @param x Value to fill.
*
*/
void _memsetb(uintptr_t dst, size_t cnt, uint8_t x)
{
int i;
uint8_t *p = (uint8_t *) dst;
for(i=0; i<cnt; i++)
p[i] = x;
}
/** Fill block of memory
*
* Fill cnt words at dst address with the value x.
* The filling is done word-by-word.
*
* @param dst Origin address to fill.
* @param cnt Number of words to fill.
* @param x Value to fill.
*
*/
void _memsetw(uintptr_t dst, size_t cnt, uint16_t x)
{
int i;
uint16_t *p = (uint16_t *) dst;
for(i=0; i<cnt; i++)
p[i] = x;
}
/** @}
*/