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1 | /* |
2 | * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> | |
3 | * Copyright (C) 2008-2009 PetaLogix | |
4 | * Copyright (C) 2007 John Williams | |
5 | * | |
6 | * Reasonably optimised generic C-code for memset on Microblaze | |
7 | * This is generic C code to do efficient, alignment-aware memcpy. | |
8 | * | |
9 | * It is based on demo code originally Copyright 2001 by Intel Corp, taken from | |
10 | * http://www.embedded.com/showArticle.jhtml?articleID=19205567 | |
11 | * | |
af901ca1 | 12 | * Attempts were made, unsuccessfully, to contact the original |
322ae8eb MS |
13 | * author of this code (Michael Morrow, Intel). Below is the original |
14 | * copyright notice. | |
15 | * | |
16 | * This software has been developed by Intel Corporation. | |
17 | * Intel specifically disclaims all warranties, express or | |
18 | * implied, and all liability, including consequential and | |
19 | * other indirect damages, for the use of this program, including | |
20 | * liability for infringement of any proprietary rights, | |
21 | * and including the warranties of merchantability and fitness | |
22 | * for a particular purpose. Intel does not assume any | |
23 | * responsibility for and errors which may appear in this program | |
24 | * not any responsibility to update it. | |
25 | */ | |
26 | ||
27 | #include <linux/types.h> | |
28 | #include <linux/stddef.h> | |
29 | #include <linux/compiler.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/string.h> | |
32 | ||
33 | #ifdef __HAVE_ARCH_MEMSET | |
34 | void *memset(void *v_src, int c, __kernel_size_t n) | |
35 | { | |
36 | ||
37 | char *src = v_src; | |
38 | #ifdef CONFIG_OPT_LIB_FUNCTION | |
39 | uint32_t *i_src; | |
40 | uint32_t w32; | |
41 | #endif | |
42 | /* Truncate c to 8 bits */ | |
43 | c = (c & 0xFF); | |
44 | ||
45 | #ifdef CONFIG_OPT_LIB_FUNCTION | |
46 | /* Make a repeating word out of it */ | |
47 | w32 = c; | |
48 | w32 |= w32 << 8; | |
49 | w32 |= w32 << 16; | |
50 | ||
51 | if (n >= 4) { | |
52 | /* Align the destination to a word boundary */ | |
53 | /* This is done in an endian independant manner */ | |
54 | switch ((unsigned) src & 3) { | |
55 | case 1: | |
56 | *src++ = c; | |
57 | --n; | |
58 | case 2: | |
59 | *src++ = c; | |
60 | --n; | |
61 | case 3: | |
62 | *src++ = c; | |
63 | --n; | |
64 | } | |
65 | ||
66 | i_src = (void *)src; | |
67 | ||
68 | /* Do as many full-word copies as we can */ | |
69 | for (; n >= 4; n -= 4) | |
70 | *i_src++ = w32; | |
71 | ||
72 | src = (void *)i_src; | |
73 | } | |
74 | #endif | |
75 | /* Simple, byte oriented memset or the rest of count. */ | |
76 | while (n--) | |
77 | *src++ = c; | |
78 | ||
79 | return v_src; | |
80 | } | |
81 | EXPORT_SYMBOL(memset); | |
82 | #endif /* __HAVE_ARCH_MEMSET */ |