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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /**
  30.  * @file    memstr.c
  31.  * @brief   Memory string operations.
  32.  *
  33.  * This file provides architecture independent functions
  34.  * to manipulate blocks of memory. These functions
  35.  * are optimized as much as generic functions of
  36.  * this type can be. However, architectures are
  37.  * free to provide even more optimized versions of these
  38.  * functions.
  39.  */
  40.  
  41. #include <memstr.h>
  42. #include <arch/types.h>
  43. #include <align.h>
  44.  
  45. /** Copy block of memory
  46.  *
  47.  * Copy cnt bytes from src address to dst address.
  48.  * The copying is done word-by-word and then byte-by-byte.
  49.  * The source and destination memory areas cannot overlap.
  50.  *
  51.  * @param src Origin address to copy from.
  52.  * @param dst Origin address to copy to.
  53.  * @param cnt Number of bytes to copy.
  54.  *
  55.  */
  56. void *_memcpy(void * dst, const void *src, size_t cnt)
  57. {
  58.     int i, j;
  59.    
  60.     if (ALIGN_UP((__address) src, sizeof(__native)) != (__address) src ||
  61.         ALIGN_UP((__address) dst, sizeof(__native)) != (__address) dst) {
  62.         for (i = 0; i < cnt; i++)
  63.             ((__u8 *) dst)[i] = ((__u8 *) src)[i];
  64.     } else {
  65.    
  66.         for (i = 0; i < cnt/sizeof(__native); i++)
  67.             ((__native *) dst)[i] = ((__native *) src)[i];
  68.        
  69.         for (j = 0; j < cnt%sizeof(__native); j++)
  70.             ((__u8 *)(((__native *) dst) + i))[j] = ((__u8 *)(((__native *) src) + i))[j];
  71.     }
  72.        
  73.     return (char *)src;
  74. }
  75.  
  76. /** Fill block of memory
  77.  *
  78.  * Fill cnt bytes at dst address with the value x.
  79.  * The filling is done byte-by-byte.
  80.  *
  81.  * @param dst Origin address to fill.
  82.  * @param cnt Number of bytes to fill.
  83.  * @param x   Value to fill.
  84.  *
  85.  */
  86. void _memsetb(__address dst, size_t cnt, __u8 x)
  87. {
  88.     int i;
  89.     __u8 *p = (__u8 *) dst;
  90.    
  91.     for(i=0; i<cnt; i++)
  92.         p[i] = x;
  93. }
  94.  
  95. /** Fill block of memory
  96.  *
  97.  * Fill cnt words at dst address with the value x.
  98.  * The filling is done word-by-word.
  99.  *
  100.  * @param dst Origin address to fill.
  101.  * @param cnt Number of words to fill.
  102.  * @param x   Value to fill.
  103.  *
  104.  */
  105. void _memsetw(__address dst, size_t cnt, __u16 x)
  106. {
  107.     int i;
  108.     __u16 *p = (__u16 *) dst;
  109.    
  110.     for(i=0; i<cnt; i++)
  111.         p[i] = x;  
  112. }
  113.