1 /* $NetBSD: byte_swap.h,v 1.7 2010/01/14 02:06:04 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2010 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 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 /* 33 * Copy of the i386 version. 64 bit versions may be added later. 34 */ 35 36 #ifndef _AMD64_BYTE_SWAP_H_ 37 #define _AMD64_BYTE_SWAP_H_ 38 39 #ifdef __x86_64__ 40 41 #ifdef __GNUC__ 42 #include <sys/types.h> 43 __BEGIN_DECLS 44 45 #define __BYTE_SWAP_U64_VARIABLE __byte_swap_u64_variable 46 static __inline uint64_t __byte_swap_u64_variable(uint64_t); 47 static __inline uint64_t 48 __byte_swap_u64_variable(uint64_t x) 49 { 50 __asm volatile ( "bswap %1" : "=r" (x) : "0" (x)); 51 return (x); 52 } 53 54 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable 55 static __inline uint32_t __byte_swap_u32_variable(uint32_t); 56 static __inline uint32_t 57 __byte_swap_u32_variable(uint32_t x) 58 { 59 __asm volatile ( "bswap %1" : "=r" (x) : "0" (x)); 60 return (x); 61 } 62 63 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable 64 static __inline uint16_t __byte_swap_u16_variable(uint16_t); 65 static __inline uint16_t 66 __byte_swap_u16_variable(uint16_t x) 67 { 68 __asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x)); 69 return (x); 70 } 71 72 __END_DECLS 73 #endif 74 75 #else /* __x86_64__ */ 76 77 #include <i386/byte_swap.h> 78 79 #endif /* __x86_64__ */ 80 81 #endif /* !_AMD64_BYTE_SWAP_H_ */ 82