Subversion Repositories HelenOS

Rev

Rev 2745 | Rev 3274 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  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.     unsigned int i, j;
  63.    
  64.     if (ALIGN_UP((uintptr_t) src, sizeof(unative_t)) != (uintptr_t) src ||
  65.         ALIGN_UP((uintptr_t) dst, sizeof(unative_t)) != (uintptr_t) dst) {
  66.         for (i = 0; i < cnt; i++)
  67.             ((uint8_t *) dst)[i] = ((uint8_t *) src)[i];
  68.     } else {
  69.    
  70.         for (i = 0; i < cnt / sizeof(unative_t); i++)
  71.             ((unative_t *) dst)[i] = ((unative_t *) src)[i];
  72.        
  73.         for (j = 0; j < cnt % sizeof(unative_t); j++)
  74.             ((uint8_t *)(((unative_t *) dst) + i))[j] = ((uint8_t *)(((unative_t *) 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(uintptr_t dst, size_t cnt, uint8_t x)
  91. {
  92.     unsigned int i;
  93.     uint8_t *p = (uint8_t *) 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(uintptr_t dst, size_t cnt, uint16_t x)
  110. {
  111.     unsigned int i;
  112.     uint16_t *p = (uint16_t *) dst;
  113.    
  114.     for (i = 0; i < cnt; i++)
  115.         p[i] = x;  
  116. }
  117.  
  118. /** Copy string
  119.  *
  120.  * Copy string from src address to dst address.
  121.  * The copying is done char-by-char until the null
  122.  * character. The source and destination memory areas
  123.  * cannot overlap.
  124.  *
  125.  * @param src Origin string to copy from.
  126.  * @param dst Origin string to copy to.
  127.  *
  128.  */
  129. char *strcpy(char *dest, const char *src)
  130. {
  131.     char *orig = dest;
  132.    
  133.     while ((*(dest++) = *(src++)))
  134.         ;
  135.     return orig;
  136. }
  137.  
  138. /** @}
  139.  */
  140.