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Rev | Author | Line No. | Line |
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361 | bondari | 1 | /* |
2071 | 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 | |||
1888 | jermar | 29 | /** @addtogroup ia32 |
1702 | cejka | 30 | * @{ |
31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
1888 | jermar | 35 | #ifndef KERN_ia32_MEMSTR_H_ |
36 | #define KERN_ia32_MEMSTR_H_ |
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361 | bondari | 37 | |
38 | /** Copy memory |
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39 | * |
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40 | * Copy a given number of bytes (3rd argument) |
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41 | * from the memory location defined by 2nd argument |
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42 | * to the memory location defined by 1st argument. |
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43 | * The memory areas cannot overlap. |
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44 | * |
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393 | bondari | 45 | * @param dst Destination |
46 | * @param src Source |
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47 | * @param cnt Number of bytes |
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48 | * @return Destination |
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361 | bondari | 49 | */ |
50 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
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51 | { |
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1780 | jermar | 52 | unative_t d0, d1, d2; |
361 | bondari | 53 | |
2082 | decky | 54 | asm volatile( |
361 | bondari | 55 | /* copy all full dwords */ |
56 | "rep movsl\n\t" |
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57 | /* load count again */ |
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58 | "movl %4, %%ecx\n\t" |
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59 | /* ecx = ecx mod 4 */ |
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60 | "andl $3, %%ecx\n\t" |
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61 | /* are there last <=3 bytes? */ |
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62 | "jz 1f\n\t" |
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63 | /* copy last <=3 bytes */ |
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64 | "rep movsb\n\t" |
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65 | /* exit from asm block */ |
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66 | "1:\n" |
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67 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
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1780 | jermar | 68 | : "0" ((unative_t) (cnt / 4)), "g" ((unative_t) cnt), "1" ((unative_t) dst), "2" ((unative_t) src) |
361 | bondari | 69 | : "memory"); |
70 | |||
71 | return dst; |
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72 | } |
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73 | |||
74 | |||
392 | bondari | 75 | /** Compare memory regions for equality |
390 | bondari | 76 | * |
77 | * Compare a given number of bytes (3rd argument) |
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78 | * at memory locations defined by 1st and 2nd argument |
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392 | bondari | 79 | * for equality. If bytes are equal function returns 0. |
390 | bondari | 80 | * |
393 | bondari | 81 | * @param src Region 1 |
82 | * @param dst Region 2 |
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83 | * @param cnt Number of bytes |
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84 | * @return Zero if bytes are equal, non-zero otherwise |
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390 | bondari | 85 | */ |
419 | bondari | 86 | static inline int memcmp(const void * src, const void * dst, size_t cnt) |
390 | bondari | 87 | { |
1780 | jermar | 88 | uint32_t d0, d1, d2; |
390 | bondari | 89 | int ret; |
90 | |||
2082 | decky | 91 | asm ( |
390 | bondari | 92 | "repe cmpsb\n\t" |
93 | "je 1f\n\t" |
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94 | "movl %3, %0\n\t" |
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95 | "addl $1, %0\n\t" |
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96 | "1:\n" |
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97 | : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2) |
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1780 | jermar | 98 | : "0" (0), "1" ((unative_t) src), "2" ((unative_t) dst), "3" ((unative_t) cnt) |
390 | bondari | 99 | ); |
100 | |||
101 | return ret; |
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102 | } |
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361 | bondari | 103 | |
392 | bondari | 104 | /** Fill memory with words |
105 | * Fill a given number of words (2nd argument) |
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106 | * at memory defined by 1st argument with the |
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107 | * word value defined by 3rd argument. |
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108 | * |
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393 | bondari | 109 | * @param dst Destination |
110 | * @param cnt Number of words |
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111 | * @param x Value to fill |
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392 | bondari | 112 | */ |
1780 | jermar | 113 | static inline void memsetw(uintptr_t dst, size_t cnt, uint16_t x) |
392 | bondari | 114 | { |
1780 | jermar | 115 | uint32_t d0, d1; |
392 | bondari | 116 | |
2082 | decky | 117 | asm volatile ( |
392 | bondari | 118 | "rep stosw\n\t" |
119 | : "=&D" (d0), "=&c" (d1), "=a" (x) |
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120 | : "0" (dst), "1" (cnt), "2" (x) |
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121 | : "memory" |
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122 | ); |
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123 | |||
124 | } |
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125 | |||
126 | /** Fill memory with bytes |
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127 | * Fill a given number of bytes (2nd argument) |
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128 | * at memory defined by 1st argument with the |
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129 | * word value defined by 3rd argument. |
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130 | * |
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393 | bondari | 131 | * @param dst Destination |
132 | * @param cnt Number of bytes |
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133 | * @param x Value to fill |
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392 | bondari | 134 | */ |
1780 | jermar | 135 | static inline void memsetb(uintptr_t dst, size_t cnt, uint8_t x) |
392 | bondari | 136 | { |
1780 | jermar | 137 | uint32_t d0, d1; |
392 | bondari | 138 | |
2082 | decky | 139 | asm volatile ( |
392 | bondari | 140 | "rep stosb\n\t" |
141 | : "=&D" (d0), "=&c" (d1), "=a" (x) |
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142 | : "0" (dst), "1" (cnt), "2" (x) |
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143 | : "memory" |
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144 | ); |
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145 | |||
146 | } |
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147 | |||
361 | bondari | 148 | #endif |
1702 | cejka | 149 | |
1888 | jermar | 150 | /** @} |
1702 | cejka | 151 | */ |