36 lines
887 B
C
36 lines
887 B
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <string.h>
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void *memcpy(void *dest, const void *src, size_t n)
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{
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unsigned long d0, d1, d2;
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asm volatile(
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#ifdef __x86_64__
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"rep ; movsd\n\t"
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"mov %4,%%rcx\n\t"
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#else
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"rep ; movsl\n\t"
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"movl %4,%%ecx\n\t"
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#endif
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"rep ; movsb\n\t"
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: "=&c" (d0), "=&D" (d1), "=&S" (d2)
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: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
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: "memory"
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);
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return dest;
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}
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