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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2005 Sergey Bondari |
2 | * Copyright (C) 2005 Sergey Bondari |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | #ifndef __ia32_MEMSTR_H__ |
29 | #ifndef __ia32_MEMSTR_H__ |
| 30 | #define __ia32_MEMSTR_H__ |
30 | #define __ia32_MEMSTR_H__ |
| 31 | 31 | ||
| 32 | extern void memsetw(__address dst, size_t cnt, __u16 x); |
- | |
| 33 | extern void memsetb(__address dst, size_t cnt, __u8 x); |
- | |
| 34 | - | ||
| 35 | /** Copy memory |
32 | /** Copy memory |
| 36 | * |
33 | * |
| 37 | * Copy a given number of bytes (3rd argument) |
34 | * Copy a given number of bytes (3rd argument) |
| 38 | * from the memory location defined by 2nd argument |
35 | * from the memory location defined by 2nd argument |
| 39 | * to the memory location defined by 1st argument. |
36 | * to the memory location defined by 1st argument. |
| 40 | * The memory areas cannot overlap. |
37 | * The memory areas cannot overlap. |
| 41 | * |
38 | * |
| 42 | * @param destination |
39 | * @param destination |
| 43 | * @param source |
40 | * @param source |
| 44 | * @param number of bytes |
41 | * @param number of bytes |
| 45 | * @return destination |
42 | * @return destination |
| 46 | */ |
43 | */ |
| 47 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
44 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
| 48 | { |
45 | { |
| 49 | __u32 d0, d1, d2; |
46 | __u32 d0, d1, d2; |
| 50 | 47 | ||
| 51 | __asm__ __volatile__( |
48 | __asm__ __volatile__( |
| 52 | /* copy all full dwords */ |
49 | /* copy all full dwords */ |
| 53 | "rep movsl\n\t" |
50 | "rep movsl\n\t" |
| 54 | /* load count again */ |
51 | /* load count again */ |
| 55 | "movl %4, %%ecx\n\t" |
52 | "movl %4, %%ecx\n\t" |
| 56 | /* ecx = ecx mod 4 */ |
53 | /* ecx = ecx mod 4 */ |
| 57 | "andl $3, %%ecx\n\t" |
54 | "andl $3, %%ecx\n\t" |
| 58 | /* are there last <=3 bytes? */ |
55 | /* are there last <=3 bytes? */ |
| 59 | "jz 1f\n\t" |
56 | "jz 1f\n\t" |
| 60 | /* copy last <=3 bytes */ |
57 | /* copy last <=3 bytes */ |
| 61 | "rep movsb\n\t" |
58 | "rep movsb\n\t" |
| 62 | /* exit from asm block */ |
59 | /* exit from asm block */ |
| 63 | "1:\n" |
60 | "1:\n" |
| 64 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
61 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
| 65 | : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src) |
62 | : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src) |
| 66 | : "memory"); |
63 | : "memory"); |
| 67 | 64 | ||
| 68 | return dst; |
65 | return dst; |
| 69 | } |
66 | } |
| 70 | 67 | ||
| 71 | 68 | ||
| 72 | /** Compare memory |
69 | /** Compare memory regions for equality |
| 73 | * |
70 | * |
| 74 | * Compare a given number of bytes (3rd argument) |
71 | * Compare a given number of bytes (3rd argument) |
| 75 | * at memory locations defined by 1st and 2nd argument |
72 | * at memory locations defined by 1st and 2nd argument |
| 76 | * for equality. If memory is equal, returns 0. |
73 | * for equality. If bytes are equal function returns 0. |
| 77 | * |
74 | * |
| 78 | * @param pointer 1 |
75 | * @param region 1 |
| 79 | * @param pointer 2 |
76 | * @param region 2 |
| 80 | * @param number of bytes |
77 | * @param number of bytes |
| 81 | * @return 0 on match or non-zero if different |
78 | * @return zero if bytes are equal, non-zero otherwise |
| 82 | */ |
79 | */ |
| 83 | static inline int memcmp(const void * mem1, const void * mem2, size_t cnt) |
80 | static inline int memcmp(__address src, __address dst, size_t cnt) |
| 84 | { |
81 | { |
| 85 | __u32 d0, d1, d2; |
82 | __u32 d0, d1, d2; |
| 86 | int ret; |
83 | int ret; |
| 87 | 84 | ||
| 88 | __asm__ ( |
85 | __asm__ ( |
| 89 | "repe cmpsb\n\t" |
86 | "repe cmpsb\n\t" |
| 90 | "je 1f\n\t" |
87 | "je 1f\n\t" |
| 91 | "movl %3, %0\n\t" |
88 | "movl %3, %0\n\t" |
| 92 | "addl $1, %0\n\t" |
89 | "addl $1, %0\n\t" |
| 93 | "1:\n" |
90 | "1:\n" |
| 94 | : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2) |
91 | : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2) |
| 95 | : "0" (0), "1" (mem1), "2" (mem2), "3" (cnt) |
92 | : "0" (0), "1" (src), "2" (dst), "3" (cnt) |
| 96 | ); |
93 | ); |
| 97 | 94 | ||
| 98 | return ret; |
95 | return ret; |
| 99 | } |
96 | } |
| - | 97 | ||
| - | 98 | /** Fill memory with words |
|
| - | 99 | * Fill a given number of words (2nd argument) |
|
| - | 100 | * at memory defined by 1st argument with the |
|
| - | 101 | * word value defined by 3rd argument. |
|
| - | 102 | * |
|
| - | 103 | * @param destination |
|
| - | 104 | * @param number of words |
|
| - | 105 | * @param value to fill |
|
| - | 106 | */ |
|
| - | 107 | static inline void memsetw(__address dst, size_t cnt, __u16 x) |
|
| - | 108 | { |
|
| - | 109 | __u32 d0, d1; |
|
| - | 110 | ||
| - | 111 | __asm__ __volatile__ ( |
|
| - | 112 | "rep stosw\n\t" |
|
| - | 113 | : "=&D" (d0), "=&c" (d1), "=a" (x) |
|
| - | 114 | : "0" (dst), "1" (cnt), "2" (x) |
|
| - | 115 | : "memory" |
|
| - | 116 | ); |
|
| - | 117 | ||
| - | 118 | } |
|
| - | 119 | ||
| - | 120 | /** Fill memory with bytes |
|
| - | 121 | * Fill a given number of bytes (2nd argument) |
|
| - | 122 | * at memory defined by 1st argument with the |
|
| - | 123 | * word value defined by 3rd argument. |
|
| - | 124 | * |
|
| - | 125 | * @param destination |
|
| - | 126 | * @param number of bytes |
|
| - | 127 | * @param value to fill |
|
| - | 128 | */ |
|
| - | 129 | static inline void memsetb(__address dst, size_t cnt, __u8 x) |
|
| - | 130 | { |
|
| - | 131 | __u32 d0, d1; |
|
| - | 132 | ||
| - | 133 | __asm__ __volatile__ ( |
|
| - | 134 | "rep stosb\n\t" |
|
| - | 135 | : "=&D" (d0), "=&c" (d1), "=a" (x) |
|
| - | 136 | : "0" (dst), "1" (cnt), "2" (x) |
|
| - | 137 | : "memory" |
|
| - | 138 | ); |
|
| - | 139 | ||
| - | 140 | } |
|
| 100 | 141 | ||
| 101 | #endif |
142 | #endif |
| 102 | 143 | ||