WebSVN – HelenOS – Diff – /trunk/kernel/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 KERN_ia32_MEMSTR_H_
#define KERN_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)
{
        unative_t 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" ((unative_t) (cnt / 4)), "g" ((unative_t) cnt), "1" ((unative_t) dst), "2" ((unative_t) 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)
{
    uint32_t 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" ((unative_t) src), "2" ((unative_t) dst), "3" ((unative_t) 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(uintptr_t dst, size_t cnt, uint16_t x)
{
    uint32_t 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(uintptr_t dst, size_t cnt, uint8_t x)
{
    uint32_t d0, d1;
   
    __asm__ __volatile__ (
        "rep stosb\n\t"
        : "=&D" (d0), "=&c" (d1), "=a" (x)
        : "0" (dst), "1" (cnt), "2" (x)
        : "memory"
    );
 
}
 
#endif
 
/** @}
 */
 

Rev 1888	Rev 2071
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	29	/** @addtogroup ia32
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#ifndef KERN_ia32_MEMSTR_H_	35	#ifndef KERN_ia32_MEMSTR_H_
36	#define KERN_ia32_MEMSTR_H_	36	#define KERN_ia32_MEMSTR_H_
37		37
38	/** Copy memory	38	/** Copy memory
39	*	39	*
40	* Copy a given number of bytes (3rd argument)	40	* Copy a given number of bytes (3rd argument)
41	* from the memory location defined by 2nd argument	41	* from the memory location defined by 2nd argument
42	* to the memory location defined by 1st argument.	42	* to the memory location defined by 1st argument.
43	* The memory areas cannot overlap.	43	* The memory areas cannot overlap.
44	*	44	*
45	* @param dst Destination	45	* @param dst Destination
46	* @param src Source	46	* @param src Source
47	* @param cnt Number of bytes	47	* @param cnt Number of bytes
48	* @return Destination	48	* @return Destination
49	*/	49	*/
50	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)
51	{	51	{
52	unative_t d0, d1, d2;	52	unative_t d0, d1, d2;
53		53
54	__asm__ __volatile__(	54	__asm__ __volatile__(
55	/* copy all full dwords */	55	/* copy all full dwords */
56	"rep movsl\n\t"	56	"rep movsl\n\t"
57	/* load count again */	57	/* load count again */
58	"movl %4, %%ecx\n\t"	58	"movl %4, %%ecx\n\t"
59	/* ecx = ecx mod 4 */	59	/* ecx = ecx mod 4 */
60	"andl $3, %%ecx\n\t"	60	"andl $3, %%ecx\n\t"
61	/* are there last <=3 bytes? */	61	/* are there last <=3 bytes? */
62	"jz 1f\n\t"	62	"jz 1f\n\t"
63	/* copy last <=3 bytes */	63	/* copy last <=3 bytes */
64	"rep movsb\n\t"	64	"rep movsb\n\t"
65	/* exit from asm block */	65	/* exit from asm block */
66	"1:\n"	66	"1:\n"
67	: "=&c" (d0), "=&D" (d1), "=&S" (d2)	67	: "=&c" (d0), "=&D" (d1), "=&S" (d2)
68	: "0" ((unative_t) (cnt / 4)), "g" ((unative_t) cnt), "1" ((unative_t) dst), "2" ((unative_t) src)	68	: "0" ((unative_t) (cnt / 4)), "g" ((unative_t) cnt), "1" ((unative_t) dst), "2" ((unative_t) src)
69	: "memory");	69	: "memory");
70		70
71	return dst;	71	return dst;
72	}	72	}
73		73
74		74
75	/** Compare memory regions for equality	75	/** Compare memory regions for equality
76	*	76	*
77	* Compare a given number of bytes (3rd argument)	77	* Compare a given number of bytes (3rd argument)
78	* at memory locations defined by 1st and 2nd argument	78	* at memory locations defined by 1st and 2nd argument
79	* for equality. If bytes are equal function returns 0.	79	* for equality. If bytes are equal function returns 0.
80	*	80	*
81	* @param src Region 1	81	* @param src Region 1
82	* @param dst Region 2	82	* @param dst Region 2
83	* @param cnt Number of bytes	83	* @param cnt Number of bytes
84	* @return Zero if bytes are equal, non-zero otherwise	84	* @return Zero if bytes are equal, non-zero otherwise
85	*/	85	*/
86	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)
87	{	87	{
88	uint32_t d0, d1, d2;	88	uint32_t d0, d1, d2;
89	int ret;	89	int ret;
90		90
91	__asm__ (	91	__asm__ (
92	"repe cmpsb\n\t"	92	"repe cmpsb\n\t"
93	"je 1f\n\t"	93	"je 1f\n\t"
94	"movl %3, %0\n\t"	94	"movl %3, %0\n\t"
95	"addl $1, %0\n\t"	95	"addl $1, %0\n\t"
96	"1:\n"	96	"1:\n"
97	: "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2)	97	: "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2)
98	: "0" (0), "1" ((unative_t) src), "2" ((unative_t) dst), "3" ((unative_t) cnt)	98	: "0" (0), "1" ((unative_t) src), "2" ((unative_t) dst), "3" ((unative_t) cnt)
99	);	99	);
100		100
101	return ret;	101	return ret;
102	}	102	}
103		103
104	/** Fill memory with words	104	/** Fill memory with words
105	* Fill a given number of words (2nd argument)	105	* Fill a given number of words (2nd argument)
106	* at memory defined by 1st argument with the	106	* at memory defined by 1st argument with the
107	* word value defined by 3rd argument.	107	* word value defined by 3rd argument.
108	*	108	*
109	* @param dst Destination	109	* @param dst Destination
110	* @param cnt Number of words	110	* @param cnt Number of words
111	* @param x Value to fill	111	* @param x Value to fill
112	*/	112	*/
113	static inline void memsetw(uintptr_t dst, size_t cnt, uint16_t x)	113	static inline void memsetw(uintptr_t dst, size_t cnt, uint16_t x)
114	{	114	{
115	uint32_t d0, d1;	115	uint32_t d0, d1;
116		116
117	__asm__ __volatile__ (	117	__asm__ __volatile__ (
118	"rep stosw\n\t"	118	"rep stosw\n\t"
119	: "=&D" (d0), "=&c" (d1), "=a" (x)	119	: "=&D" (d0), "=&c" (d1), "=a" (x)
120	: "0" (dst), "1" (cnt), "2" (x)	120	: "0" (dst), "1" (cnt), "2" (x)
121	: "memory"	121	: "memory"
122	);	122	);
123		123
124	}	124	}
125		125
126	/** Fill memory with bytes	126	/** Fill memory with bytes
127	* Fill a given number of bytes (2nd argument)	127	* Fill a given number of bytes (2nd argument)
128	* at memory defined by 1st argument with the	128	* at memory defined by 1st argument with the
129	* word value defined by 3rd argument.	129	* word value defined by 3rd argument.
130	*	130	*
131	* @param dst Destination	131	* @param dst Destination
132	* @param cnt Number of bytes	132	* @param cnt Number of bytes
133	* @param x Value to fill	133	* @param x Value to fill
134	*/	134	*/
135	static inline void memsetb(uintptr_t dst, size_t cnt, uint8_t x)	135	static inline void memsetb(uintptr_t dst, size_t cnt, uint8_t x)
136	{	136	{
137	uint32_t d0, d1;	137	uint32_t d0, d1;
138		138
139	__asm__ __volatile__ (	139	__asm__ __volatile__ (
140	"rep stosb\n\t"	140	"rep stosb\n\t"
141	: "=&D" (d0), "=&c" (d1), "=a" (x)	141	: "=&D" (d0), "=&c" (d1), "=a" (x)
142	: "0" (dst), "1" (cnt), "2" (x)	142	: "0" (dst), "1" (cnt), "2" (x)
143	: "memory"	143	: "memory"
144	);	144	);
145		145
146	}	146	}
147		147
148	#endif	148	#endif
149		149
150	/** @}	150	/** @}
151	*/	151	*/
152		152

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(root)/trunk/kernel/arch/ia32/include/memstr.h – Rev 1888 → 2071