mpc55xxevb/start/copy.S

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup mpc55xx_asm
0007  *
0008  * @brief Memory copy functions.
0009  */
0010
0011 /*
0012  * Copyright (c) 2008 embedded brains GmbH & Co. KG
0013  * Redistribution and use in source and binary forms, with or without
0014  * modification, are permitted provided that the following conditions
0015  * are met:
0016  * 1. Redistributions of source code must retain the above copyright
0017  *    notice, this list of conditions and the following disclaimer.
0018  * 2. Redistributions in binary form must reproduce the above copyright
0019  *    notice, this list of conditions and the following disclaimer in the
0020  *    documentation and/or other materials provided with the distribution.
0021  *
0022  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0023  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0025  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0028  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0029  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0030  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0031  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0032  * POSSIBILITY OF SUCH DAMAGE.
0033  */
0034
0035 #include <libcpu/powerpc-utility.h>
0036 #include <bspopts.h>
0037
0038     .section ".bsp_start_text", "ax"
0039
0040 /**
0041  * @fn int mpc55xx_copy_8( const void *src, void *dest, size_t n)
0042  *
0043  * @brief Copy @a n bytes from @a src to @a dest with 8 byte reads and writes.
0044  *
0045  * The memory areas should not overlap.  The addresses @a src and @a dest have
0046  * to be aligned on 8 byte boundaries.  The size @a n must be evenly divisible by 8.
0047  * The SPE operations @b evxor, @b evlddx and @b evstddx will be used.
0048  */
0049 #if       ((MPC55XX_CHIP_TYPE>=5510) && (MPC55XX_CHIP_TYPE<=5517))
0050 GLOBAL_FUNCTION mpc55xx_copy_8
0051 #endif /* ((MPC55XX_CHIP_TYPE>=5510) && (MPC55XX_CHIP_TYPE<=5517)) */
0052 GLOBAL_FUNCTION mpc55xx_copy_4
0053     /* Loop counter = data size / 4 */
0054     srwi. r5, r5, 2
0055     beqlr
0056     mtctr r5
0057     xor   r5,r5,r5
0058 copy_data4:
0059     lwzx  r6, r5, r3
0060     stwx  r6, r5, r4
0061     addi r5, r5, 4
0062     bdnz copy_data4
0063
0064     /* Return */
0065     blr
0066
0067 #if  !((MPC55XX_CHIP_TYPE>=5510) && (MPC55XX_CHIP_TYPE<=5517))
0068 /**
0069  * @fn int mpc55xx_copy_8( const void *src, void *dest, size_t n)
0070  *
0071  * @brief Copy @a n bytes from @a src to @a dest with 8 byte reads and writes.
0072  *
0073  * The memory areas should not overlap.  The addresses @a src and @a dest have
0074  * to be aligned on 8 byte boundaries.  The size @a n must be evenly divisible by 8.
0075  * The SPE operations @b evxor, @b evlddx and @b evstddx will be used.
0076  */
0077 GLOBAL_FUNCTION mpc55xx_copy_8
0078     /* Loop counter = data size / 8 */
0079     srwi. r5, r5, 3
0080     beqlr
0081     mtctr r5
0082
0083     /* Set offset */
0084     evxor r5, r5, r5
0085
0086 copy_data:
0087     evlddx r6, r3, r5
0088     evstddx r6, r4, r5
0089     addi r5, r5, 8
0090     bdnz copy_data
0091
0092     /* Return */
0093     blr
0094 #endif /*!((MPC55XX_CHIP_TYPE>=5510) && (MPC55XX_CHIP_TYPE<=5517))*/