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| Rev | Author | Line No. | Line |
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| 361 | bondari | 1 | /* |
| 363 | jermar | 2 | * Copyright (C) 2005 Sergey Bondari |
| 361 | bondari | 3 | * All rights reserved. |
| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef __ia32_MEMSTR_H__ |
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| 30 | #define __ia32_MEMSTR_H__ |
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| 31 | |||
| 32 | /** Copy memory |
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| 33 | * |
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| 34 | * Copy a given number of bytes (3rd argument) |
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| 35 | * from the memory location defined by 2nd argument |
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| 36 | * to the memory location defined by 1st argument. |
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| 37 | * The memory areas cannot overlap. |
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| 38 | * |
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| 393 | bondari | 39 | * @param dst Destination |
| 40 | * @param src Source |
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| 41 | * @param cnt Number of bytes |
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| 42 | * @return Destination |
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| 361 | bondari | 43 | */ |
| 44 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
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| 45 | { |
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| 419 | bondari | 46 | __native d0, d1, d2; |
| 361 | bondari | 47 | |
| 48 | __asm__ __volatile__( |
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| 49 | /* copy all full dwords */ |
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| 50 | "rep movsl\n\t" |
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| 51 | /* load count again */ |
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| 52 | "movl %4, %%ecx\n\t" |
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| 53 | /* ecx = ecx mod 4 */ |
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| 54 | "andl $3, %%ecx\n\t" |
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| 55 | /* are there last <=3 bytes? */ |
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| 56 | "jz 1f\n\t" |
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| 57 | /* copy last <=3 bytes */ |
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| 58 | "rep movsb\n\t" |
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| 59 | /* exit from asm block */ |
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| 60 | "1:\n" |
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| 61 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
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| 419 | bondari | 62 | : "0" ((__native) (cnt / 4)), "g" ((__native) cnt), "1" ((__native) dst), "2" ((__native) src) |
| 361 | bondari | 63 | : "memory"); |
| 64 | |||
| 65 | return dst; |
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| 66 | } |
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| 67 | |||
| 68 | |||
| 392 | bondari | 69 | /** Compare memory regions for equality |
| 390 | bondari | 70 | * |
| 71 | * Compare a given number of bytes (3rd argument) |
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| 72 | * at memory locations defined by 1st and 2nd argument |
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| 392 | bondari | 73 | * for equality. If bytes are equal function returns 0. |
| 390 | bondari | 74 | * |
| 393 | bondari | 75 | * @param src Region 1 |
| 76 | * @param dst Region 2 |
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| 77 | * @param cnt Number of bytes |
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| 78 | * @return Zero if bytes are equal, non-zero otherwise |
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| 390 | bondari | 79 | */ |
| 419 | bondari | 80 | static inline int memcmp(const void * src, const void * dst, size_t cnt) |
| 390 | bondari | 81 | { |
| 82 | __u32 d0, d1, d2; |
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| 83 | int ret; |
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| 84 | |||
| 85 | __asm__ ( |
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| 86 | "repe cmpsb\n\t" |
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| 87 | "je 1f\n\t" |
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| 88 | "movl %3, %0\n\t" |
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| 89 | "addl $1, %0\n\t" |
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| 90 | "1:\n" |
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| 91 | : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2) |
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| 419 | bondari | 92 | : "0" (0), "1" ((__native) src), "2" ((__native) dst), "3" ((__native) cnt) |
| 390 | bondari | 93 | ); |
| 94 | |||
| 95 | return ret; |
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| 96 | } |
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| 361 | bondari | 97 | |
| 392 | bondari | 98 | /** Fill memory with words |
| 99 | * Fill a given number of words (2nd argument) |
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| 100 | * at memory defined by 1st argument with the |
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| 101 | * word value defined by 3rd argument. |
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| 102 | * |
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| 393 | bondari | 103 | * @param dst Destination |
| 104 | * @param cnt Number of words |
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| 105 | * @param x Value to fill |
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| 392 | bondari | 106 | */ |
| 107 | static inline void memsetw(__address dst, size_t cnt, __u16 x) |
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| 108 | { |
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| 109 | __u32 d0, d1; |
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| 110 | |||
| 111 | __asm__ __volatile__ ( |
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| 112 | "rep stosw\n\t" |
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| 113 | : "=&D" (d0), "=&c" (d1), "=a" (x) |
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| 114 | : "0" (dst), "1" (cnt), "2" (x) |
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| 115 | : "memory" |
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| 116 | ); |
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| 117 | |||
| 118 | } |
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| 119 | |||
| 120 | /** Fill memory with bytes |
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| 121 | * Fill a given number of bytes (2nd argument) |
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| 122 | * at memory defined by 1st argument with the |
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| 123 | * word value defined by 3rd argument. |
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| 124 | * |
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| 393 | bondari | 125 | * @param dst Destination |
| 126 | * @param cnt Number of bytes |
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| 127 | * @param x Value to fill |
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| 392 | bondari | 128 | */ |
| 129 | static inline void memsetb(__address dst, size_t cnt, __u8 x) |
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| 130 | { |
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| 131 | __u32 d0, d1; |
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| 132 | |||
| 133 | __asm__ __volatile__ ( |
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| 134 | "rep stosb\n\t" |
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| 135 | : "=&D" (d0), "=&c" (d1), "=a" (x) |
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| 136 | : "0" (dst), "1" (cnt), "2" (x) |
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| 137 | : "memory" |
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| 138 | ); |
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| 139 | |||
| 140 | } |
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| 141 | |||
| 361 | bondari | 142 | #endif |