]>
Commit | Line | Data |
---|---|---|
322ae8eb MS |
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 | |
93e2e851 MS |
34 | #ifndef CONFIG_OPT_LIB_FUNCTION |
35 | void *memset(void *v_src, int c, __kernel_size_t n) | |
36 | { | |
37 | char *src = v_src; | |
38 | ||
39 | /* Truncate c to 8 bits */ | |
40 | c = (c & 0xFF); | |
41 | ||
42 | /* Simple, byte oriented memset or the rest of count. */ | |
43 | while (n--) | |
44 | *src++ = c; | |
45 | ||
46 | return v_src; | |
47 | } | |
48 | #else /* CONFIG_OPT_LIB_FUNCTION */ | |
322ae8eb MS |
49 | void *memset(void *v_src, int c, __kernel_size_t n) |
50 | { | |
322ae8eb | 51 | char *src = v_src; |
322ae8eb | 52 | uint32_t *i_src; |
78ebfa88 | 53 | uint32_t w32 = 0; |
93e2e851 | 54 | |
322ae8eb MS |
55 | /* Truncate c to 8 bits */ |
56 | c = (c & 0xFF); | |
57 | ||
78ebfa88 MS |
58 | if (unlikely(c)) { |
59 | /* Make a repeating word out of it */ | |
60 | w32 = c; | |
61 | w32 |= w32 << 8; | |
62 | w32 |= w32 << 16; | |
63 | } | |
322ae8eb | 64 | |
78ebfa88 | 65 | if (likely(n >= 4)) { |
322ae8eb | 66 | /* Align the destination to a word boundary */ |
25985edc | 67 | /* This is done in an endian independent manner */ |
322ae8eb MS |
68 | switch ((unsigned) src & 3) { |
69 | case 1: | |
70 | *src++ = c; | |
71 | --n; | |
72 | case 2: | |
73 | *src++ = c; | |
74 | --n; | |
75 | case 3: | |
76 | *src++ = c; | |
77 | --n; | |
78 | } | |
79 | ||
80 | i_src = (void *)src; | |
81 | ||
82 | /* Do as many full-word copies as we can */ | |
83 | for (; n >= 4; n -= 4) | |
84 | *i_src++ = w32; | |
85 | ||
86 | src = (void *)i_src; | |
87 | } | |
93e2e851 | 88 | |
322ae8eb MS |
89 | /* Simple, byte oriented memset or the rest of count. */ |
90 | while (n--) | |
91 | *src++ = c; | |
92 | ||
93 | return v_src; | |
94 | } | |
93e2e851 | 95 | #endif /* CONFIG_OPT_LIB_FUNCTION */ |
322ae8eb MS |
96 | EXPORT_SYMBOL(memset); |
97 | #endif /* __HAVE_ARCH_MEMSET */ |