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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); |
32 | extern void memsetw(__address dst, size_t cnt, __u16 x); |
33 | extern void memsetb(__address dst, size_t cnt, __u8 x); |
33 | extern void memsetb(__address dst, size_t cnt, __u8 x); |
34 | 34 | ||
35 | extern int memcmp(__address src, __address dst, int cnt); |
- | |
36 | - | ||
37 | /** Copy memory |
35 | /** Copy memory |
38 | * |
36 | * |
39 | * Copy a given number of bytes (3rd argument) |
37 | * Copy a given number of bytes (3rd argument) |
40 | * from the memory location defined by 2nd argument |
38 | * from the memory location defined by 2nd argument |
41 | * to the memory location defined by 1st argument. |
39 | * to the memory location defined by 1st argument. |
42 | * The memory areas cannot overlap. |
40 | * The memory areas cannot overlap. |
43 | * |
41 | * |
44 | * @param destination |
42 | * @param destination |
45 | * @param source |
43 | * @param source |
46 | * @param number of bytes |
44 | * @param number of bytes |
47 | * @return destination |
45 | * @return destination |
48 | */ |
46 | */ |
49 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
47 | static inline void * memcpy(void * dst, const void * src, size_t cnt) |
50 | { |
48 | { |
51 | __u32 d0, d1, d2; |
49 | __u32 d0, d1, d2; |
52 | 50 | ||
53 | __asm__ __volatile__( |
51 | __asm__ __volatile__( |
54 | /* copy all full dwords */ |
52 | /* copy all full dwords */ |
55 | "rep movsl\n\t" |
53 | "rep movsl\n\t" |
56 | /* load count again */ |
54 | /* load count again */ |
57 | "movl %4, %%ecx\n\t" |
55 | "movl %4, %%ecx\n\t" |
58 | /* ecx = ecx mod 4 */ |
56 | /* ecx = ecx mod 4 */ |
59 | "andl $3, %%ecx\n\t" |
57 | "andl $3, %%ecx\n\t" |
60 | /* are there last <=3 bytes? */ |
58 | /* are there last <=3 bytes? */ |
61 | "jz 1f\n\t" |
59 | "jz 1f\n\t" |
62 | /* copy last <=3 bytes */ |
60 | /* copy last <=3 bytes */ |
63 | "rep movsb\n\t" |
61 | "rep movsb\n\t" |
64 | /* exit from asm block */ |
62 | /* exit from asm block */ |
65 | "1:\n" |
63 | "1:\n" |
66 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
64 | : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
67 | : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src) |
65 | : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src) |
68 | : "memory"); |
66 | : "memory"); |
69 | 67 | ||
70 | return dst; |
68 | return dst; |
71 | } |
69 | } |
72 | 70 | ||
73 | 71 | ||
- | 72 | /** Compare memory |
|
- | 73 | * |
|
- | 74 | * Compare a given number of bytes (3rd argument) |
|
- | 75 | * at memory locations defined by 1st and 2nd argument |
|
- | 76 | * for equality. If memory is equal, returns 0. |
|
- | 77 | * |
|
- | 78 | * @param pointer 1 |
|
- | 79 | * @param pointer 2 |
|
- | 80 | * @param number of bytes |
|
- | 81 | * @return 0 on match or non-zero if different |
|
- | 82 | */ |
|
- | 83 | static inline int memcmp(const void * mem1, const void * mem2, size_t cnt) |
|
- | 84 | { |
|
- | 85 | __u32 d0, d1, d2; |
|
- | 86 | int ret; |
|
- | 87 | ||
- | 88 | __asm__ ( |
|
- | 89 | "repe cmpsb\n\t" |
|
- | 90 | "je 1f\n\t" |
|
- | 91 | "movl %3, %0\n\t" |
|
- | 92 | "addl $1, %0\n\t" |
|
- | 93 | "1:\n" |
|
- | 94 | : "=a" (ret), "=%S" (d0), "=&D" (d1), "=&c" (d2) |
|
- | 95 | : "0" (0), "1" (mem1), "2" (mem2), "3" (cnt) |
|
- | 96 | ); |
|
- | 97 | ||
- | 98 | return ret; |
|
- | 99 | } |
|
74 | 100 | ||
75 | #endif |
101 | #endif |
76 | 102 |