byte_swap.h revision 1.2
1/* $NetBSD: byte_swap.h,v 1.2 2014/10/28 19:46:18 dennis Exp $ */ 2 3/*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#ifndef _RISCV_BYTE_SWAP_H_ 33#define _RISCV_BYTE_SWAP_H_ 34 35#ifdef _LOCORE 36 37#define BSWAP16(_src, _dst, _tmp) \ 38 andi _dst, _src, 0xff ;\ 39 slli _dst, _dst, 8 ;\ 40 srli _tmp, _src, 8 ;\ 41 and _tmp, _tmp, 0xff ;\ 42 ori _dst, _dst, _tmp 43 44#define BSWAP32(_src, _dst, _tmp) \ 45 li v1, 0xff00 ;\ 46 slli _dst, _src, 24 ;\ 47 srli _tmp, _src, 24 ;\ 48 ori _dst, _dst, _tmp ;\ 49 and _tmp, _src, v1 ;\ 50 slli _tmp, _src, 8 ;\ 51 ori _dst, _dst, _tmp ;\ 52 srli _tmp, _src, 8 ;\ 53 and _tmp, _tmp, v1 ;\ 54 ori _dst, _dst, _tmp 55 56#else 57 58#include <sys/types.h> 59__BEGIN_DECLS 60 61#define __BYTE_SWAP_U64_VARIABLE __byte_swap_u64_variable 62static __inline uint64_t 63__byte_swap_u64_variable(uint64_t v) 64{ 65 v = ((v & 0x000000ff) << (56 - 0)) | ((v >> (56 - 0)) & 0x000000ff) 66 | ((v & 0x0000ff00) << (48 - 8)) | ((v >> (48 - 8)) & 0x0000ff00) 67 | ((v & 0x00ff0000) << (40 - 16)) | ((v >> (40 - 16)) & 0x00ff0000) 68 | ((v & 0xff000000) << (32 - 24)) | ((v >> (32 - 24)) & 0xff000000); 69 70 return v; 71} 72 73#define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable 74static __inline uint32_t 75__byte_swap_u32_variable(uint32_t v) 76{ 77 v = ((v & 0x00ff) << (24 - 0)) | ((v >> (24 - 0)) & 0x00ff) 78 | ((v & 0xff00) << (16 - 8)) | ((v >> (16 - 8)) & 0xff00); 79 80 return v; 81} 82 83#define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable 84static __inline uint16_t 85__byte_swap_u16_variable(uint16_t v) 86{ 87 v &= 0xffff; 88 v = (v >> 8) | (v << 8); 89 90 return v; 91} 92 93__END_DECLS 94 95#endif /* _LOCORE */ 96 97#endif /* _RISCV_BYTE_SWAP_H_ */ 98