forked from Imagelibrary/rtems
82 lines
2.0 KiB
ArmAsm
82 lines
2.0 KiB
ArmAsm
/**
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* @file
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*
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* @ingroup mpc55xx_asm
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*
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* @brief Memory copy functions.
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*/
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/*
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* Copyright (c) 2008
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* Embedded Brains GmbH
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* Obere Lagerstr. 30
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* D-82178 Puchheim
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* Germany
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* rtems@embedded-brains.de
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <libcpu/powerpc-utility.h>
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#include <bspopts.h>
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.section ".bsp_start_text", "ax"
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/**
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* @fn int mpc55xx_copy_8( const void *src, void *dest, size_t n)
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*
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* @brief Copy @a n bytes from @a src to @a dest with 8 byte reads and writes.
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*
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* The memory areas should not overlap. The addresses @a src and @a dest have
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* to be aligned on 8 byte boundaries. The size @a n must be evenly divisible by 8.
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* The SPE operations @b evxor, @b evlddx and @b evstddx will be used.
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*/
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#if ((MPC55XX_CHIP_TYPE>=5510) && (MPC55XX_CHIP_TYPE<=5517))
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GLOBAL_FUNCTION mpc55xx_copy_8
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#endif /* ((MPC55XX_CHIP_TYPE>=5510) && (MPC55XX_CHIP_TYPE<=5517)) */
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GLOBAL_FUNCTION mpc55xx_copy_4
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/* Loop counter = data size / 4 */
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srwi. r5, r5, 2
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beqlr
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mtctr r5
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xor r5,r5,r5
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copy_data4:
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lwzx r6, r5, r3
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stwx r6, r5, r4
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addi r5, r5, 4
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bdnz copy_data4
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/* Return */
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blr
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#if !((MPC55XX_CHIP_TYPE>=5510) && (MPC55XX_CHIP_TYPE<=5517))
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/**
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* @fn int mpc55xx_copy_8( const void *src, void *dest, size_t n)
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*
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* @brief Copy @a n bytes from @a src to @a dest with 8 byte reads and writes.
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*
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* The memory areas should not overlap. The addresses @a src and @a dest have
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* to be aligned on 8 byte boundaries. The size @a n must be evenly divisible by 8.
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* The SPE operations @b evxor, @b evlddx and @b evstddx will be used.
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*/
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GLOBAL_FUNCTION mpc55xx_copy_8
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/* Loop counter = data size / 8 */
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srwi. r5, r5, 3
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beqlr
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mtctr r5
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/* Set offset */
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evxor r5, r5, r5
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copy_data:
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evlddx r6, r3, r5
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evstddx r6, r4, r5
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addi r5, r5, 8
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bdnz copy_data
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/* Return */
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blr
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#endif /*!((MPC55XX_CHIP_TYPE>=5510) && (MPC55XX_CHIP_TYPE<=5517))*/
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