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Rev 3107 Rev 3403
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 *
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 *
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 * @param MEMCPY_DST	Destination address.
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 * @param MEMCPY_DST	Destination address.
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 * @param MEMCPY_SRC	Source address.
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 * @param MEMCPY_SRC	Source address.
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 * @param MEMCPY_SIZE	Number of bytes to copy.
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 * @param MEMCPY_SIZE	Number of bytes to copy.
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 *
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 *
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 * @retrun MEMCPY_SRC on success, 0 on failure.
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 * @retrun MEMCPY_DST on success, 0 on failure.
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 */
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 */
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memcpy:
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memcpy:
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memcpy_from_uspace:
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memcpy_from_uspace:
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memcpy_to_uspace:
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memcpy_to_uspace:
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	movq MEMCPY_SRC, %rax
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	movq MEMCPY_DST, %rax
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	movq MEMCPY_SIZE, %rcx
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	movq MEMCPY_SIZE, %rcx
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	shrq $3, %rcx			/* size / 8 */
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	shrq $3, %rcx			/* size / 8 */
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	rep movsq			/* copy as much as possible word by word */
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	rep movsq			/* copy as much as possible word by word */