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| 2 | * Copyright (C) 2008-2009 Michal Simek <[email protected]>
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| 3 | * Copyright (C) 2008-2009 PetaLogix
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| 4 | * Copyright (C) 2007 John Williams
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| 5 | *
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| 6 | * Reasonably optimised generic C-code for memset on Microblaze
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| 7 | * This is generic C code to do efficient, alignment-aware memcpy.
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| 8 | *
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| 9 | * It is based on demo code originally Copyright 2001 by Intel Corp, taken from
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| 10 | * http://www.embedded.com/showArticle.jhtml?articleID=19205567
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| 11 | *
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| 12 | * Attempts were made, unsuccessfully, to contact the original
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| 13 | * author of this code (Michael Morrow, Intel). Below is the original
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| 14 | * copyright notice.
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| 15 | *
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| 16 | * This software has been developed by Intel Corporation.
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| 17 | * Intel specifically disclaims all warranties, express or
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| 18 | * implied, and all liability, including consequential and
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| 19 | * other indirect damages, for the use of this program, including
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| 20 | * liability for infringement of any proprietary rights,
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| 21 | * and including the warranties of merchantability and fitness
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| 22 | * for a particular purpose. Intel does not assume any
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| 23 | * responsibility for and errors which may appear in this program
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| 24 | * not any responsibility to update it.
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| 25 |
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| 26 |
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| 27 | #include <linux/export.h>
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| 28 | #include <linux/types.h>
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| 29 | #include <linux/stddef.h>
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| 30 | #include <linux/compiler.h>
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| 31 | #include <linux/string.h>
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| 32 |
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| 33 | #ifdef CONFIG_OPT_LIB_FUNCTION
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| 34 | void *memset(void *v_src, int c, __kernel_size_t n)
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| 35 | {
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| 36 | char *src = v_src;
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| 37 | uint32_t *i_src;
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| 38 | uint32_t w32 = 0;
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| 39 |
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| 40 |
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| 41 | c = (c & 0xFF);
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| 42 |
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| 43 | if (unlikely(c)) {
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| 44 |
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| 45 | w32 = c;
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| 46 | w32 |= w32 << 8;
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| 47 | w32 |= w32 << 16;
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| 48 | }
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| 49 |
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| 50 | if (likely(n >= 4)) {
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| 51 |
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| 52 |
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| 53 | switch ((unsigned) src & 3) {
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| 54 | case 1:
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| 55 | *src++ = c;
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| 56 | --n;
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| 57 | fallthrough;
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| 58 | case 2:
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| 59 | *src++ = c;
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| 60 | --n;
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| 61 | fallthrough;
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| 62 | case 3:
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| 63 | *src++ = c;
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| 64 | --n;
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| 65 | }
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| 66 |
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| 67 | i_src = (void *)src;
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| 68 |
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| 69 |
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| 70 | for (; n >= 4; n -= 4)
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| 71 | *i_src++ = w32;
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| 72 |
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| 73 | src = (void *)i_src;
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| 74 | }
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| 75 |
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| 76 |
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| 77 | switch (n) {
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| 78 | case 3:
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| 79 | *src++ = c;
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| 80 | fallthrough;
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| 81 | case 2:
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| 82 | *src++ = c;
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| 83 | fallthrough;
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| 84 | case 1:
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| 85 | *src++ = c;
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| 86 | break;
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| 87 | default:
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| 88 | break;
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| 89 | }
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| 90 |
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| 91 | return v_src;
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| 92 | }
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| 93 | EXPORT_SYMBOL(memset);
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| 94 | #endif
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