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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.  /** @addtogroup generic   
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief   Memory string operations.
  36.  *
  37.  * This file provides architecture independent functions
  38.  * to manipulate blocks of memory. These functions
  39.  * are optimized as much as generic functions of
  40.  * this type can be. However, architectures are
  41.  * free to provide even more optimized versions of these
  42.  * functions.
  43.  */
  44.  
  45. #include <memstr.h>
  46. #include <arch/types.h>
  47. #include <align.h>
  48.  
  49. /** Copy block of memory
  50.  *
  51.  * Copy cnt bytes from src address to dst address.
  52.  * The copying is done word-by-word and then byte-by-byte.
  53.  * The source and destination memory areas cannot overlap.
  54.  *
  55.  * @param src Origin address to copy from.
  56.  * @param dst Origin address to copy to.
  57.  * @param cnt Number of bytes to copy.
  58.  *
  59.  */
  60. void *_memcpy(void * dst, const void *src, size_t cnt)
  61. {
  62.     int i, j;
  63.    
  64.     if (ALIGN_UP((__address) src, sizeof(__native)) != (__address) src ||
  65.         ALIGN_UP((__address) dst, sizeof(__native)) != (__address) dst) {
  66.         for (i = 0; i < cnt; i++)
  67.             ((__u8 *) dst)[i] = ((__u8 *) src)[i];
  68.     } else {
  69.    
  70.         for (i = 0; i < cnt/sizeof(__native); i++)
  71.             ((__native *) dst)[i] = ((__native *) src)[i];
  72.        
  73.         for (j = 0; j < cnt%sizeof(__native); j++)
  74.             ((__u8 *)(((__native *) dst) + i))[j] = ((__u8 *)(((__native *) src) + i))[j];
  75.     }
  76.        
  77.     return (char *)src;
  78. }
  79.  
  80. /** Fill block of memory
  81.  *
  82.  * Fill cnt bytes at dst address with the value x.
  83.  * The filling is done byte-by-byte.
  84.  *
  85.  * @param dst Origin address to fill.
  86.  * @param cnt Number of bytes to fill.
  87.  * @param x   Value to fill.
  88.  *
  89.  */
  90. void _memsetb(__address dst, size_t cnt, __u8 x)
  91. {
  92.     int i;
  93.     __u8 *p = (__u8 *) dst;
  94.    
  95.     for(i=0; i<cnt; i++)
  96.         p[i] = x;
  97. }
  98.  
  99. /** Fill block of memory
  100.  *
  101.  * Fill cnt words at dst address with the value x.
  102.  * The filling is done word-by-word.
  103.  *
  104.  * @param dst Origin address to fill.
  105.  * @param cnt Number of words to fill.
  106.  * @param x   Value to fill.
  107.  *
  108.  */
  109. void _memsetw(__address dst, size_t cnt, __u16 x)
  110. {
  111.     int i;
  112.     __u16 *p = (__u16 *) dst;
  113.    
  114.     for(i=0; i<cnt; i++)
  115.         p[i] = x;  
  116. }
  117.  
  118.  /** @}
  119.  */
  120.  
  121.