byte_swap.h revision 1.3
1/* $NetBSD: byte_swap.h,v 1.3 2014/10/28 20:25:36 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 const uint64_t m1 = 0x0000ffff0000ffffull; 66 const uint64_t m0 = 0x00ff00ff00ff00ffull; 67 68 v = (v >> 32) | (v << 32); 69 v = ((v >> 16) & m1) | ((v & m1) << 16); 70 v = ((v >> 8) & m0) | ((v & m0) << 8); 71 72 return v; 73} 74 75#define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable 76static __inline uint32_t 77__byte_swap_u32_variable(uint32_t v) 78{ 79 const uint32_t m = 0xff00ff; 80 81 v = (v >> 16) | (v << 16); 82 v = ((v >> 8) & m) | ((v & m) << 8); 83 84 return v; 85} 86 87#define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable 88static __inline uint16_t 89__byte_swap_u16_variable(uint16_t v) 90{ 91 v &= 0xffff; 92 v = (v >> 8) | (v << 8); 93 94 return v; 95} 96 97__END_DECLS 98 99#endif /* _LOCORE */ 100 101#endif /* _RISCV_BYTE_SWAP_H_ */ 102