Subversion Repositories HelenOS

Rev

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

Rev Author Line No. Line
1 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2001-2004 Jakub Jermar
1 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 
 
1757 jermar 29 
/** @addtogroup generic
1702 cejka 30 
 * @{
31 
 */
32 
 
1264 jermar 33 
/**
1702 cejka 34 
 * @file
1264 jermar 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 
 
1 jermar 45 
#include <memstr.h>
46 
#include <arch/types.h>
1612 jermar 47 
#include <align.h>
1 jermar 48 
 
62 decky 49 
/** Copy block of memory
50 
 *
51 
 * Copy cnt bytes from src address to dst address.
882 jermar 52 
 * The copying is done word-by-word and then byte-by-byte.
53 
 * The source and destination memory areas cannot overlap.
62 decky 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 
 */
360 jermar 60 
void *_memcpy(void * dst, const void *src, size_t cnt)
1 jermar 61 
{
2745 decky 62 
    unsigned int i, j;
1 jermar 63 
 
1780 jermar 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) {
1612 jermar 66 
        for (i = 0; i < cnt; i++)
1780 jermar 67 
            ((uint8_t *) dst)[i] = ((uint8_t *) src)[i];
1612 jermar 68 
    } else {
69 
 
1780 jermar 70 
        for (i = 0; i < cnt/sizeof(unative_t); i++)
71 
            ((unative_t *) dst)[i] = ((unative_t *) src)[i];
195 vana 72 
 
1780 jermar 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];
1612 jermar 75 
    }
882 jermar 76 
 
2125 decky 77 
    return (char *) src;
1 jermar 78 
}
79 
 
62 decky 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 
 */
1780 jermar 90 
void _memsetb(uintptr_t dst, size_t cnt, uint8_t x)
1 jermar 91 
{
2745 decky 92 
    unsigned int i;
1780 jermar 93 
    uint8_t *p = (uint8_t *) dst;
1 jermar 94 
 
2125 decky 95 
    for (i = 0; i < cnt; i++)
1 jermar 96 
        p[i] = x;
97 
}
200 palkovsky 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 
 */
1780 jermar 109 
void _memsetw(uintptr_t dst, size_t cnt, uint16_t x)
200 palkovsky 110 
{
2745 decky 111 
    unsigned int i;
1780 jermar 112 
    uint16_t *p = (uint16_t *) dst;
200 palkovsky 113 
 
2125 decky 114 
    for (i = 0; i < cnt; i++)
200 palkovsky 115 
        p[i] = x;  
116 
}
1702 cejka 117 
 
2125 decky 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 
 
2272 jermar 133 
    while ((*(dest++) = *(src++)))
134 
        ;
2125 decky 135 
    return orig;
136 
}
137 
 
1757 jermar 138 
/** @}
1702 cejka 139 
 */