diff options
author | Michal Simek <monstr@monstr.eu> | 2009-03-27 09:25:21 -0400 |
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committer | Michal Simek <monstr@monstr.eu> | 2009-03-27 09:25:21 -0400 |
commit | 322ae8eb91c1730728400c5b8dd1108aef1205b8 (patch) | |
tree | d5c74be5b85ba2938f98172e72727b31fc214eaa /arch/microblaze/lib/memset.c | |
parent | 16bfeaf23ead78d937b3eacfb5c7cdc7bff6d3da (diff) |
microblaze_v8: supported function for memory - kernel/lib
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/lib/memset.c')
-rw-r--r-- | arch/microblaze/lib/memset.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/microblaze/lib/memset.c b/arch/microblaze/lib/memset.c new file mode 100644 index 000000000000..941dc8f94b03 --- /dev/null +++ b/arch/microblaze/lib/memset.c | |||
@@ -0,0 +1,82 @@ | |||
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 | * | ||
12 | * Attempts were made, unsuccesfully, to contact the original | ||
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 */ | ||