| 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 | |