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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 |