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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 | extern void memsetw(__address dst, size_t cnt, __u16 x); |
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| 33 | extern void memsetb(__address dst, size_t cnt, __u8 x); |
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| 34 | |||
| 35 | /** Copy memory |
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| 36 | * |
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| 37 | * Copy a given number of bytes (3rd argument) |
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| 38 | * from the memory location defined by 2nd argument |
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| 39 | * to the memory location defined by 1st argument. |
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| 40 | * The memory areas cannot overlap. |
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| 41 | * |
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| 42 | * @param destination |
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| 43 | * @param source |
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| 44 | * @param number of bytes |
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| 45 | * @return destination |
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| 46 | */ |
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| 47 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
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| 48 | { |
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| 49 | __u32 d0, d1, d2; |
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| 50 | |||
| 51 | __asm__ __volatile__( |
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| 52 | /* copy all full dwords */ |
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| 53 | "rep movsl\n\t" |
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| 54 | /* load count again */ |
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| 55 | "movl %4, %%ecx\n\t" |
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| 56 | /* ecx = ecx mod 4 */ |
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| 57 | "andl $3, %%ecx\n\t" |
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| 58 | /* are there last <=3 bytes? */ |
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| 59 | "jz 1f\n\t" |
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| 60 | /* copy last <=3 bytes */ |
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| 61 | "rep movsb\n\t" |
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| 62 | /* exit from asm block */ |
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| 63 | "1:\n" |
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| 64 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
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| 65 | : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src) |
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| 66 | : "memory"); |
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| 67 | |||
| 68 | return dst; |
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| 69 | } |
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| 70 | |||
| 71 | |||
| 390 | bondari | 72 | /** Compare memory |
| 73 | * |
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| 74 | * Compare a given number of bytes (3rd argument) |
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| 75 | * at memory locations defined by 1st and 2nd argument |
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| 76 | * for equality. If memory is equal, returns 0. |
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| 77 | * |
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| 78 | * @param pointer 1 |
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| 79 | * @param pointer 2 |
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| 80 | * @param number of bytes |
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| 81 | * @return 0 on match or non-zero if different |
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| 82 | */ |
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| 83 | static inline int memcmp(const void * mem1, const void * mem2, size_t cnt) |
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| 84 | { |
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| 85 | __u32 d0, d1, d2; |
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| 86 | int ret; |
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| 87 | |||
| 88 | __asm__ ( |
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| 89 | "repe cmpsb\n\t" |
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| 90 | "je 1f\n\t" |
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| 91 | "movl %3, %0\n\t" |
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| 92 | "addl $1, %0\n\t" |
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| 93 | "1:\n" |
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| 94 | : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2) |
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| 95 | : "0" (0), "1" (mem1), "2" (mem2), "3" (cnt) |
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| 96 | ); |
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| 97 | |||
| 98 | return ret; |
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| 99 | } |
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| 361 | bondari | 100 | |
| 101 | #endif |