| 1 | /*
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| 2 | * Copyright (C) 2005 HelenOS project
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __ia32_MEMSTR_H__
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| 30 | #define __ia32_MEMSTR_H__
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| 31 |
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| 32 | extern void memsetw(__address dst, size_t cnt, __u16 x);
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| 33 | extern void memsetb(__address dst, size_t cnt, __u8 x);
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| 34 |
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| 35 | extern int memcmp(__address src, __address dst, int cnt);
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| 36 |
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| 37 | /** Copy memory
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| 38 | *
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| 39 | * Copy a given number of bytes (3rd argument)
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| 40 | * from the memory location defined by 2nd argument
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| 41 | * to the memory location defined by 1st argument.
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| 42 | * The memory areas cannot overlap.
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| 43 | *
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| 44 | * @param destination
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| 45 | * @param source
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| 46 | * @param number of bytes
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| 47 | * @return destination
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| 48 | */
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| 49 | static inline void * memcpy(void * dst, const void * src, size_t cnt)
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| 50 | {
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| 51 | __u32 d0, d1, d2;
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| 52 |
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| 53 | __asm__ __volatile__(
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| 54 | /* copy all full dwords */
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| 55 | "rep movsl\n\t"
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| 56 | /* load count again */
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| 57 | "movl %4, %%ecx\n\t"
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| 58 | /* ecx = ecx mod 4 */
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| 59 | "andl $3, %%ecx\n\t"
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| 60 | /* are there last <=3 bytes? */
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| 61 | "jz 1f\n\t"
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| 62 | /* copy last <=3 bytes */
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| 63 | "rep movsb\n\t"
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| 64 | /* exit from asm block */
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| 65 | "1:\n"
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| 66 | : "=&c" (d0), "=&D" (d1), "=&S" (d2)
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| 67 | : "0" (cnt / 4), "g" (cnt), "1" ((__u32) dst), "2" ((__u32) src)
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| 68 | : "memory");
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| 69 |
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| 70 | return dst;
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| 71 | }
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| 72 |
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| 73 |
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| 74 |
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| 75 | #endif
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