2 * Copyright (C) 2005 Sergey Bondari
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
35 #ifndef KERN_ia32_MEMSTR_H_
36 #define KERN_ia32_MEMSTR_H_
40 * Copy a given number of bytes (3rd argument)
41 * from the memory location defined by 2nd argument
42 * to the memory location defined by 1st argument.
43 * The memory areas cannot overlap.
45 * @param dst Destination
47 * @param cnt Number of bytes
50 static inline void * memcpy(void * dst
, const void * src
, size_t cnt
)
55 /* copy all full dwords */
57 /* load count again */
61 /* are there last <=3 bytes? */
63 /* copy last <=3 bytes */
65 /* exit from asm block */
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
)
75 /** Compare memory regions for equality
77 * Compare a given number of bytes (3rd argument)
78 * at memory locations defined by 1st and 2nd argument
79 * for equality. If bytes are equal function returns 0.
83 * @param cnt Number of bytes
84 * @return Zero if bytes are equal, non-zero otherwise
86 static inline int memcmp(const void * src
, const void * dst
, size_t cnt
)
97 : "=a" (ret
), "=%S" (d0
), "=&D" (d1
), "=&c" (d2
)
98 : "0" (0), "1" ((unative_t
) src
), "2" ((unative_t
) dst
), "3" ((unative_t
) cnt
)
104 /** Fill memory with words
105 * Fill a given number of words (2nd argument)
106 * at memory defined by 1st argument with the
107 * word value defined by 3rd argument.
109 * @param dst Destination
110 * @param cnt Number of words
111 * @param x Value to fill
113 static inline void memsetw(uintptr_t dst
, size_t cnt
, uint16_t x
)
117 __asm__
__volatile__ (
119 : "=&D" (d0
), "=&c" (d1
), "=a" (x
)
120 : "0" (dst
), "1" (cnt
), "2" (x
)
126 /** Fill memory with bytes
127 * Fill a given number of bytes (2nd argument)
128 * at memory defined by 1st argument with the
129 * word value defined by 3rd argument.
131 * @param dst Destination
132 * @param cnt Number of bytes
133 * @param x Value to fill
135 static inline void memsetb(uintptr_t dst
, size_t cnt
, uint8_t x
)
139 __asm__
__volatile__ (
141 : "=&D" (d0
), "=&c" (d1
), "=a" (x
)
142 : "0" (dst
), "1" (cnt
), "2" (x
)