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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 __amd64_MEMSTR_H__ |
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| 30 | #define __amd64_MEMSTR_H__ |
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| 31 | |||
| 419 | bondari | 32 | /** Copy memory |
| 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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| 39 | * @param dst Destination |
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| 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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| 43 | */ |
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| 44 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
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| 45 | { |
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| 46 | __native d0, d1, d2; |
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| 361 | bondari | 47 | |
| 419 | bondari | 48 | __asm__ __volatile__( |
| 49 | "rep movsq\n\t" |
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| 50 | "movq %4, %%rcx\n\t" |
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| 51 | "andq $7, %%rcx\n\t" |
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| 52 | "jz 1f\n\t" |
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| 53 | "rep movsb\n\t" |
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| 54 | "1:\n" |
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| 55 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
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| 56 | : "0" ((__native)(cnt / 8)), "g" ((__native)cnt), "1" ((__native) dst), "2" ((__native) src) |
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| 57 | : "memory"); |
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| 361 | bondari | 58 | |
| 419 | bondari | 59 | return dst; |
| 60 | } |
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| 61 | |||
| 62 | |||
| 63 | /** Compare memory regions for equality |
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| 64 | * |
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| 65 | * Compare a given number of bytes (3rd argument) |
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| 66 | * at memory locations defined by 1st and 2nd argument |
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| 67 | * for equality. If bytes are equal function returns 0. |
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| 68 | * |
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| 69 | * @param src Region 1 |
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| 70 | * @param dst Region 2 |
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| 71 | * @param cnt Number of bytes |
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| 72 | * @return Zero if bytes are equal, non-zero otherwise |
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| 73 | */ |
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| 74 | static inline int memcmp(const void * src, const void * dst, size_t cnt) |
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| 75 | { |
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| 76 | __native d0, d1, d2; |
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| 77 | __native ret; |
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| 78 | |||
| 79 | __asm__ ( |
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| 80 | "repe cmpsb\n\t" |
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| 81 | "je 1f\n\t" |
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| 82 | "movq %3, %0\n\t" |
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| 83 | "addq $1, %0\n\t" |
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| 84 | "1:\n" |
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| 85 | : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2) |
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| 86 | : "0" (0), "1" (src), "2" (dst), "3" ((__native)cnt) |
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| 87 | ); |
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| 88 | |||
| 89 | return ret; |
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| 90 | } |
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| 91 | |||
| 92 | /** Fill memory with words |
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| 93 | * Fill a given number of words (2nd argument) |
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| 94 | * at memory defined by 1st argument with the |
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| 95 | * word value defined by 3rd argument. |
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| 96 | * |
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| 97 | * @param dst Destination |
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| 98 | * @param cnt Number of words |
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| 99 | * @param x Value to fill |
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| 100 | */ |
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| 101 | static inline void memsetw(__address dst, size_t cnt, __u16 x) |
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| 102 | { |
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| 103 | __native d0, d1; |
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| 104 | |||
| 105 | __asm__ __volatile__ ( |
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| 106 | "rep stosw\n\t" |
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| 107 | : "=&D" (d0), "=&c" (d1), "=a" (x) |
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| 108 | : "0" (dst), "1" ((__native)cnt), "2" (x) |
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| 109 | : "memory" |
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| 110 | ); |
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| 111 | |||
| 112 | } |
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| 113 | |||
| 114 | /** Fill memory with bytes |
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| 115 | * Fill a given number of bytes (2nd argument) |
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| 116 | * at memory defined by 1st argument with the |
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| 117 | * word value defined by 3rd argument. |
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| 118 | * |
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| 119 | * @param dst Destination |
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| 120 | * @param cnt Number of bytes |
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| 121 | * @param x Value to fill |
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| 122 | */ |
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| 123 | static inline void memsetb(__address dst, size_t cnt, __u8 x) |
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| 124 | { |
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| 125 | __native d0, d1; |
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| 126 | |||
| 127 | __asm__ __volatile__ ( |
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| 128 | "rep stosb\n\t" |
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| 129 | : "=&D" (d0), "=&c" (d1), "=a" (x) |
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| 130 | : "0" (dst), "1" ((__native)cnt), "2" (x) |
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| 131 | : "memory" |
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| 132 | ); |
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| 133 | |||
| 134 | } |
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| 135 | |||
| 361 | bondari | 136 | #endif |