WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/lib/memstr.c


/*
 * 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.
 */
 
/**
 * @file    memstr.c
 * @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>
 
/** 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;
   
    for (i = 0; i < cnt/sizeof(__native); i++)
        ((__native *) dst)[i] = ((__native *) src)[i];
       
    for (j = 0; j < cnt%sizeof(__native); j++)
        ((__u8 *)(((__native *) dst) + i))[j] = ((__u8 *)(((__native *) 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(__address dst, size_t cnt, __u8 x)
{
    int i;
    __u8 *p = (__u8 *) 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(__address dst, size_t cnt, __u16 x)
{
    int i;
    __u16 *p = (__u16 *) dst;
   
    for(i=0; i<cnt; i++)
        p[i] = x;  
}
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/lib/memstr.c @ 1612 – Rev 882 → 1264

Rev 882		Rev 1264
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		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
29	#include <memstr.h>	41	#include <memstr.h>
30	#include <arch/types.h>	42	#include <arch/types.h>
31		43
32	/** Copy block of memory	44	/** Copy block of memory
33	*	45	*
34	* Copy cnt bytes from src address to dst address.	46	* Copy cnt bytes from src address to dst address.
35	* The copying is done word-by-word and then byte-by-byte.	47	* The copying is done word-by-word and then byte-by-byte.
36	* The source and destination memory areas cannot overlap.	48	* The source and destination memory areas cannot overlap.
37	*	49	*
38	* @param src Origin address to copy from.	50	* @param src Origin address to copy from.
39	* @param dst Origin address to copy to.	51	* @param dst Origin address to copy to.
40	* @param cnt Number of bytes to copy.	52	* @param cnt Number of bytes to copy.
41	*	53	*
42	*/	54	*/
43	void _memcpy(void dst, const void *src, size_t cnt)	55	void _memcpy(void dst, const void *src, size_t cnt)
44	{	56	{
45	int i, j;	57	int i, j;
46		58
47	for (i = 0; i < cnt/sizeof(__native); i++)	59	for (i = 0; i < cnt/sizeof(__native); i++)
48	((__native ) dst)[i] = ((__native ) src)[i];	60	((__native ) dst)[i] = ((__native ) src)[i];
49		61
50	for (j = 0; j < cnt%sizeof(__native); j++)	62	for (j = 0; j < cnt%sizeof(__native); j++)
51	((__u8 )(((__native ) dst) + i))[j] = ((__u8 )(((__native ) src) + i))[j];	63	((__u8 )(((__native ) dst) + i))[j] = ((__u8 )(((__native ) src) + i))[j];
52		64
53	return (char *)src;	65	return (char *)src;
54	}	66	}
55		67
56	/** Fill block of memory	68	/** Fill block of memory
57	*	69	*
58	* Fill cnt bytes at dst address with the value x.	70	* Fill cnt bytes at dst address with the value x.
59	* The filling is done byte-by-byte.	71	* The filling is done byte-by-byte.
60	*	72	*
61	* @param dst Origin address to fill.	73	* @param dst Origin address to fill.
62	* @param cnt Number of bytes to fill.	74	* @param cnt Number of bytes to fill.
63	* @param x Value to fill.	75	* @param x Value to fill.
64	*	76	*
65	*/	77	*/
66	void _memsetb(__address dst, size_t cnt, __u8 x)	78	void _memsetb(__address dst, size_t cnt, __u8 x)
67	{	79	{
68	int i;	80	int i;
69	__u8 p = (__u8 ) dst;	81	__u8 p = (__u8 ) dst;
70		82
71	for(i=0; i<cnt; i++)	83	for(i=0; i<cnt; i++)
72	p[i] = x;	84	p[i] = x;
73	}	85	}
74		86
75	/** Fill block of memory	87	/** Fill block of memory
76	*	88	*
77	* Fill cnt words at dst address with the value x.	89	* Fill cnt words at dst address with the value x.
78	* The filling is done word-by-word.	90	* The filling is done word-by-word.
79	*	91	*
80	* @param dst Origin address to fill.	92	* @param dst Origin address to fill.
81	* @param cnt Number of words to fill.	93	* @param cnt Number of words to fill.
82	* @param x Value to fill.	94	* @param x Value to fill.
83	*	95	*
84	*/	96	*/
85	void _memsetw(__address dst, size_t cnt, __u16 x)	97	void _memsetw(__address dst, size_t cnt, __u16 x)
86	{	98	{
87	int i;	99	int i;
88	__u16 p = (__u16 ) dst;	100	__u16 p = (__u16 ) dst;
89		101
90	for(i=0; i<cnt; i++)	102	for(i=0; i<cnt; i++)
91	p[i] = x;	103	p[i] = x;
92	}	104	}
93		105