Haojian Zhuang | b15f31a | 2017-06-01 21:55:53 +0800 | [diff] [blame^] | 1 | /*- |
| 2 | * Copyright (c) 2001 David E. O'Brien |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * 3. Neither the name of the University nor the names of its contributors |
| 13 | * may be used to endorse or promote products derived from this software |
| 14 | * without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | * |
| 28 | * @(#)endian.h 8.1 (Berkeley) 6/10/93 |
| 29 | * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $ |
| 30 | * $FreeBSD$ |
| 31 | */ |
| 32 | |
| 33 | #ifndef _MACHINE_ENDIAN_H_ |
| 34 | #define _MACHINE_ENDIAN_H_ |
| 35 | |
| 36 | #include <sys/_types.h> |
| 37 | |
| 38 | /* |
| 39 | * Definitions for byte order, according to byte significance from low |
| 40 | * address to high. |
| 41 | */ |
| 42 | #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ |
| 43 | #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ |
| 44 | #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ |
| 45 | |
| 46 | #define _BYTE_ORDER _LITTLE_ENDIAN |
| 47 | |
| 48 | #if __BSD_VISIBLE |
| 49 | #define LITTLE_ENDIAN _LITTLE_ENDIAN |
| 50 | #define BIG_ENDIAN _BIG_ENDIAN |
| 51 | #define PDP_ENDIAN _PDP_ENDIAN |
| 52 | #define BYTE_ORDER _BYTE_ORDER |
| 53 | #endif |
| 54 | |
| 55 | #define _QUAD_HIGHWORD 1 |
| 56 | #define _QUAD_LOWWORD 0 |
| 57 | #define __ntohl(x) (__bswap32(x)) |
| 58 | #define __ntohs(x) (__bswap16(x)) |
| 59 | #define __htonl(x) (__bswap32(x)) |
| 60 | #define __htons(x) (__bswap16(x)) |
| 61 | |
| 62 | static __inline __uint64_t |
| 63 | __bswap64(__uint64_t x) |
| 64 | { |
| 65 | __uint64_t ret; |
| 66 | |
| 67 | __asm __volatile("rev %0, %1\n" |
| 68 | : "=&r" (ret), "+r" (x)); |
| 69 | |
| 70 | return (ret); |
| 71 | } |
| 72 | |
| 73 | static __inline __uint32_t |
| 74 | __bswap32_var(__uint32_t v) |
| 75 | { |
| 76 | __uint32_t ret; |
| 77 | |
| 78 | __asm __volatile("rev32 %x0, %x1\n" |
| 79 | : "=&r" (ret), "+r" (v)); |
| 80 | |
| 81 | return (ret); |
| 82 | } |
| 83 | |
| 84 | static __inline __uint16_t |
| 85 | __bswap16_var(__uint16_t v) |
| 86 | { |
| 87 | __uint32_t ret; |
| 88 | |
| 89 | __asm __volatile("rev16 %w0, %w1\n" |
| 90 | : "=&r" (ret), "+r" (v)); |
| 91 | |
| 92 | return ((__uint16_t)ret); |
| 93 | } |
| 94 | |
| 95 | #ifdef __OPTIMIZE__ |
| 96 | |
| 97 | #define __bswap32_constant(x) \ |
| 98 | ((((x) & 0xff000000U) >> 24) | \ |
| 99 | (((x) & 0x00ff0000U) >> 8) | \ |
| 100 | (((x) & 0x0000ff00U) << 8) | \ |
| 101 | (((x) & 0x000000ffU) << 24)) |
| 102 | |
| 103 | #define __bswap16_constant(x) \ |
| 104 | ((((x) & 0xff00) >> 8) | \ |
| 105 | (((x) & 0x00ff) << 8)) |
| 106 | |
| 107 | #define __bswap16(x) \ |
| 108 | ((__uint16_t)(__builtin_constant_p(x) ? \ |
| 109 | __bswap16_constant(x) : \ |
| 110 | __bswap16_var(x))) |
| 111 | |
| 112 | #define __bswap32(x) \ |
| 113 | ((__uint32_t)(__builtin_constant_p(x) ? \ |
| 114 | __bswap32_constant(x) : \ |
| 115 | __bswap32_var(x))) |
| 116 | |
| 117 | #else |
| 118 | #define __bswap16(x) __bswap16_var(x) |
| 119 | #define __bswap32(x) __bswap32_var(x) |
| 120 | |
| 121 | #endif /* __OPTIMIZE__ */ |
| 122 | #endif /* !_MACHINE_ENDIAN_H_ */ |