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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 | extern int memcmp(__address src, __address dst, int cnt); |
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36 | |||
37 | /** Copy memory |
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38 | * |
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39 | * Copy a given number of bytes (3rd argument) |
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40 | * from the memory location defined by 2nd argument |
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41 | * to the memory location defined by 1st argument. |
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42 | * The memory areas cannot overlap. |
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43 | * |
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44 | * @param destination |
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45 | * @param source |
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46 | * @param number of bytes |
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47 | * @return destination |
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48 | */ |
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49 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
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50 | { |
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51 | __u32 d0, d1, d2; |
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52 | |||
53 | __asm__ __volatile__( |
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54 | /* copy all full dwords */ |
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55 | "rep movsl\n\t" |
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56 | /* load count again */ |
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57 | "movl %4, %%ecx\n\t" |
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58 | /* ecx = ecx mod 4 */ |
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59 | "andl $3, %%ecx\n\t" |
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60 | /* are there last <=3 bytes? */ |
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61 | "jz 1f\n\t" |
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62 | /* copy last <=3 bytes */ |
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63 | "rep movsb\n\t" |
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64 | /* exit from asm block */ |
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65 | "1:\n" |
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66 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
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67 | : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src) |
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68 | : "memory"); |
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69 | |||
70 | return dst; |
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71 | } |
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72 | |||
73 | |||
74 | |||
75 | #endif |