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63 lines
1.3 KiB
C++
63 lines
1.3 KiB
C++
/*
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* \brief CPU-specific memcpy
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* \author Sebastian Sumpf
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* \author Johanned Schlatow
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* \date 2012-08-02
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*/
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/*
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* Copyright (C) 2012-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__CPU__STRING_H_
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#define _INCLUDE__CPU__STRING_H_
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namespace Genode {
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/**
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* Copy memory block
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*
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* \param dst destination memory block
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* \param src source memory block
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* \param size number of bytes to copy
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*
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* \return number of bytes not copied
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*/
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inline size_t memcpy_cpu(void * dst, const void * src, size_t size)
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{
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using word_t = unsigned long;
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enum {
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LEN = sizeof(word_t),
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MASK = LEN-1
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};
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unsigned char *d = (unsigned char *)dst, *s = (unsigned char *)src;
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/* check byte alignment */
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size_t d_align = (size_t)d & MASK;
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size_t s_align = (size_t)s & MASK;
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/* only same alignments work */
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if (d_align != s_align)
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return size;
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/* copy to word alignment */
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for (; (size > 0) && (s_align > 0) && (s_align < LEN);
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s_align++, *d++ = *s++, size--);
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/* copy words */
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for (; size >= LEN; size -= LEN,
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d += LEN,
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s += LEN)
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*(word_t*)d = *(word_t*)s;
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return size;
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}
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}
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#endif /* _INCLUDE__CPU__STRING_H_ */
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