WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/include/memstr.h


/*
 * Copyright (C) 2005 Sergey Bondari
 * 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.
 */
 
 /** @addtogroup ia32  
 * @{
 */
/** @file
 */
 
#ifndef __ia32_MEMSTR_H__
#define __ia32_MEMSTR_H__
 
/** Copy memory
 *
 * Copy a given number of bytes (3rd argument)
 * from the memory location defined by 2nd argument
 * to the memory location defined by 1st argument.
 * The memory areas cannot overlap.
 *
 * @param dst Destination
 * @param src Source
 * @param cnt Number of bytes
 * @return Destination
 */
static inline void * memcpy(void * dst, const void * src, size_t cnt)
{
        __native d0, d1, d2;
 
        __asm__ __volatile__(
                /* copy all full dwords */
                "rep movsl\n\t"
                /* load count again */
                "movl %4, %%ecx\n\t"
                /* ecx = ecx mod 4 */
                "andl $3, %%ecx\n\t"
                /* are there last <=3 bytes? */
                "jz 1f\n\t"
                /* copy last <=3 bytes */
                "rep movsb\n\t"
                /* exit from asm block */
                "1:\n"
                : "=&c" (d0), "=&D" (d1), "=&S" (d2)
                : "0" ((__native) (cnt / 4)), "g" ((__native) cnt), "1" ((__native) dst), "2" ((__native) src)
                : "memory");
 
        return dst;
}
 
 
/** Compare memory regions for equality
 *
 * Compare a given number of bytes (3rd argument)
 * at memory locations defined by 1st and 2nd argument
 * for equality. If bytes are equal function returns 0.
 *
 * @param src Region 1
 * @param dst Region 2
 * @param cnt Number of bytes
 * @return Zero if bytes are equal, non-zero otherwise
 */
static inline int memcmp(const void * src, const void * dst, size_t cnt)
{
    __u32 d0, d1, d2;
    int ret;
   
    __asm__ (
        "repe cmpsb\n\t"
        "je 1f\n\t"
        "movl %3, %0\n\t"
        "addl $1, %0\n\t"
        "1:\n"
        : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2)
        : "0" (0), "1" ((__native) src), "2" ((__native) dst), "3" ((__native) cnt)
    );
   
    return ret;
}
 
/** Fill memory with words
 * Fill a given number of words (2nd argument)
 * at memory defined by 1st argument with the
 * word value defined by 3rd argument.
 *
 * @param dst Destination
 * @param cnt Number of words
 * @param x Value to fill
 */
static inline void memsetw(__address dst, size_t cnt, __u16 x)
{
    __u32 d0, d1;
   
    __asm__ __volatile__ (
        "rep stosw\n\t"
        : "=&D" (d0), "=&c" (d1), "=a" (x)
        : "0" (dst), "1" (cnt), "2" (x)
        : "memory"
    );
 
}
 
/** Fill memory with bytes
 * Fill a given number of bytes (2nd argument)
 * at memory defined by 1st argument with the
 * word value defined by 3rd argument.
 *
 * @param dst Destination
 * @param cnt Number of bytes
 * @param x Value to fill
 */
static inline void memsetb(__address dst, size_t cnt, __u8 x)
{
    __u32 d0, d1;
   
    __asm__ __volatile__ (
        "rep stosb\n\t"
        : "=&D" (d0), "=&c" (d1), "=a" (x)
        : "0" (dst), "1" (cnt), "2" (x)
        : "memory"
    );
 
}
 
#endif
 
 /** @}
 */
 
 

Rev 534	Rev 1702
1	/*	1	/*
2	* Copyright (C) 2005 Sergey Bondari	2	* Copyright (C) 2005 Sergey Bondari
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	/** @addtogroup ia32
-		30	* @{
-		31	*/
-		32	/** @file
-		33	*/
-		34
29	#ifndef __ia32_MEMSTR_H__	35	#ifndef __ia32_MEMSTR_H__
30	#define __ia32_MEMSTR_H__	36	#define __ia32_MEMSTR_H__
31		37
32	/** Copy memory	38	/** Copy memory
33	*	39	*
34	* Copy a given number of bytes (3rd argument)	40	* Copy a given number of bytes (3rd argument)
35	* from the memory location defined by 2nd argument	41	* from the memory location defined by 2nd argument
36	* to the memory location defined by 1st argument.	42	* to the memory location defined by 1st argument.
37	* The memory areas cannot overlap.	43	* The memory areas cannot overlap.
38	*	44	*
39	* @param dst Destination	45	* @param dst Destination
40	* @param src Source	46	* @param src Source
41	* @param cnt Number of bytes	47	* @param cnt Number of bytes
42	* @return Destination	48	* @return Destination
43	*/	49	*/
44	static inline void * memcpy(void * dst, const void * src, size_t cnt)	50	static inline void * memcpy(void * dst, const void * src, size_t cnt)
45	{	51	{
46	__native d0, d1, d2;	52	__native d0, d1, d2;
47		53
48	__asm__ __volatile__(	54	__asm__ __volatile__(
49	/* copy all full dwords */	55	/* copy all full dwords */
50	"rep movsl\n\t"	56	"rep movsl\n\t"
51	/* load count again */	57	/* load count again */
52	"movl %4, %%ecx\n\t"	58	"movl %4, %%ecx\n\t"
53	/* ecx = ecx mod 4 */	59	/* ecx = ecx mod 4 */
54	"andl $3, %%ecx\n\t"	60	"andl $3, %%ecx\n\t"
55	/* are there last <=3 bytes? */	61	/* are there last <=3 bytes? */
56	"jz 1f\n\t"	62	"jz 1f\n\t"
57	/* copy last <=3 bytes */	63	/* copy last <=3 bytes */
58	"rep movsb\n\t"	64	"rep movsb\n\t"
59	/* exit from asm block */	65	/* exit from asm block */
60	"1:\n"	66	"1:\n"
61	: "=&c" (d0), "=&D" (d1), "=&S" (d2)	67	: "=&c" (d0), "=&D" (d1), "=&S" (d2)
62	: "0" ((__native) (cnt / 4)), "g" ((__native) cnt), "1" ((__native) dst), "2" ((__native) src)	68	: "0" ((__native) (cnt / 4)), "g" ((__native) cnt), "1" ((__native) dst), "2" ((__native) src)
63	: "memory");	69	: "memory");
64		70
65	return dst;	71	return dst;
66	}	72	}
67		73
68		74
69	/** Compare memory regions for equality	75	/** Compare memory regions for equality
70	*	76	*
71	* Compare a given number of bytes (3rd argument)	77	* Compare a given number of bytes (3rd argument)
72	* at memory locations defined by 1st and 2nd argument	78	* at memory locations defined by 1st and 2nd argument
73	* for equality. If bytes are equal function returns 0.	79	* for equality. If bytes are equal function returns 0.
74	*	80	*
75	* @param src Region 1	81	* @param src Region 1
76	* @param dst Region 2	82	* @param dst Region 2
77	* @param cnt Number of bytes	83	* @param cnt Number of bytes
78	* @return Zero if bytes are equal, non-zero otherwise	84	* @return Zero if bytes are equal, non-zero otherwise
79	*/	85	*/
80	static inline int memcmp(const void * src, const void * dst, size_t cnt)	86	static inline int memcmp(const void * src, const void * dst, size_t cnt)
81	{	87	{
82	__u32 d0, d1, d2;	88	__u32 d0, d1, d2;
83	int ret;	89	int ret;
84		90
85	__asm__ (	91	__asm__ (
86	"repe cmpsb\n\t"	92	"repe cmpsb\n\t"
87	"je 1f\n\t"	93	"je 1f\n\t"
88	"movl %3, %0\n\t"	94	"movl %3, %0\n\t"
89	"addl $1, %0\n\t"	95	"addl $1, %0\n\t"
90	"1:\n"	96	"1:\n"
91	: "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2)	97	: "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2)
92	: "0" (0), "1" ((__native) src), "2" ((__native) dst), "3" ((__native) cnt)	98	: "0" (0), "1" ((__native) src), "2" ((__native) dst), "3" ((__native) cnt)
93	);	99	);
94		100
95	return ret;	101	return ret;
96	}	102	}
97		103
98	/** Fill memory with words	104	/** Fill memory with words
99	* Fill a given number of words (2nd argument)	105	* Fill a given number of words (2nd argument)
100	* at memory defined by 1st argument with the	106	* at memory defined by 1st argument with the
101	* word value defined by 3rd argument.	107	* word value defined by 3rd argument.
102	*	108	*
103	* @param dst Destination	109	* @param dst Destination
104	* @param cnt Number of words	110	* @param cnt Number of words
105	* @param x Value to fill	111	* @param x Value to fill
106	*/	112	*/
107	static inline void memsetw(__address dst, size_t cnt, __u16 x)	113	static inline void memsetw(__address dst, size_t cnt, __u16 x)
108	{	114	{
109	__u32 d0, d1;	115	__u32 d0, d1;
110		116
111	__asm__ __volatile__ (	117	__asm__ __volatile__ (
112	"rep stosw\n\t"	118	"rep stosw\n\t"
113	: "=&D" (d0), "=&c" (d1), "=a" (x)	119	: "=&D" (d0), "=&c" (d1), "=a" (x)
114	: "0" (dst), "1" (cnt), "2" (x)	120	: "0" (dst), "1" (cnt), "2" (x)
115	: "memory"	121	: "memory"
116	);	122	);
117		123
118	}	124	}
119		125
120	/** Fill memory with bytes	126	/** Fill memory with bytes
121	* Fill a given number of bytes (2nd argument)	127	* Fill a given number of bytes (2nd argument)
122	* at memory defined by 1st argument with the	128	* at memory defined by 1st argument with the
123	* word value defined by 3rd argument.	129	* word value defined by 3rd argument.
124	*	130	*
125	* @param dst Destination	131	* @param dst Destination
126	* @param cnt Number of bytes	132	* @param cnt Number of bytes
127	* @param x Value to fill	133	* @param x Value to fill
128	*/	134	*/
129	static inline void memsetb(__address dst, size_t cnt, __u8 x)	135	static inline void memsetb(__address dst, size_t cnt, __u8 x)
130	{	136	{
131	__u32 d0, d1;	137	__u32 d0, d1;
132		138
133	__asm__ __volatile__ (	139	__asm__ __volatile__ (
134	"rep stosb\n\t"	140	"rep stosb\n\t"
135	: "=&D" (d0), "=&c" (d1), "=a" (x)	141	: "=&D" (d0), "=&c" (d1), "=a" (x)
136	: "0" (dst), "1" (cnt), "2" (x)	142	: "0" (dst), "1" (cnt), "2" (x)
137	: "memory"	143	: "memory"
138	);	144	);
139		145
140	}	146	}
141		147
142	#endif	148	#endif
-		149
-		150	/** @}
-		151	*/
-		152
143		153

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