1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2001 David E. O'Brien
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 *	@(#)endian.h	8.1 (Berkeley) 6/10/93
31 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
32 * $FreeBSD$
33 */
34
35#ifndef _ENDIAN_H_
36#define	_ENDIAN_H_
37
38#include <sys/_types.h>
39
40/*
41 * Definitions for byte order, according to byte significance from low
42 * address to high.
43 */
44#define _LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
45#define _BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
46#define _PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */
47
48#ifdef __ARMEB__
49#define _BYTE_ORDER	_BIG_ENDIAN
50#else
51#define	_BYTE_ORDER	_LITTLE_ENDIAN
52#endif /* __ARMEB__ */
53
54#if __BSD_VISIBLE
55#define LITTLE_ENDIAN   _LITTLE_ENDIAN
56#define BIG_ENDIAN      _BIG_ENDIAN
57#define PDP_ENDIAN      _PDP_ENDIAN
58#define BYTE_ORDER      _BYTE_ORDER
59#endif
60
61#ifdef __ARMEB__
62#define _QUAD_HIGHWORD 0
63#define _QUAD_LOWWORD 1
64#define __ntohl(x)	((__uint32_t)(x))
65#define __ntohs(x)	((__uint16_t)(x))
66#define __htonl(x)	((__uint32_t)(x))
67#define __htons(x)	((__uint16_t)(x))
68#else
69#define _QUAD_HIGHWORD  1
70#define _QUAD_LOWWORD 0
71#define __ntohl(x)        (__bswap32(x))
72#define __ntohs(x)        (__bswap16(x))
73#define __htonl(x)        (__bswap32(x))
74#define __htons(x)        (__bswap16(x))
75#endif /* __ARMEB__ */
76
77static __inline __uint64_t
78__bswap64(__uint64_t _x)
79{
80
81	return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
82	    ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
83	    ((_x << 24) & ((__uint64_t)0xff << 40)) |
84	    ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
85}
86
87static __inline __uint32_t
88__bswap32_var(__uint32_t v)
89{
90	__uint32_t t1;
91
92	__asm __volatile("eor %1, %0, %0, ror #16\n"
93	    		"bic %1, %1, #0x00ff0000\n"
94			"mov %0, %0, ror #8\n"
95			"eor %0, %0, %1, lsr #8\n"
96			 : "+r" (v), "=r" (t1));
97
98	return (v);
99}
100
101static __inline __uint16_t
102__bswap16_var(__uint16_t v)
103{
104	__uint32_t ret = v & 0xffff;
105
106	__asm __volatile(
107	    "mov    %0, %0, ror #8\n"
108	    "orr    %0, %0, %0, lsr #16\n"
109	    "bic    %0, %0, %0, lsl #16"
110	    : "+r" (ret));
111
112	return ((__uint16_t)ret);
113}
114
115#ifdef __OPTIMIZE__
116
117#define __bswap32_constant(x)	\
118    ((((x) & 0xff000000U) >> 24) |	\
119     (((x) & 0x00ff0000U) >>  8) |	\
120     (((x) & 0x0000ff00U) <<  8) |	\
121     (((x) & 0x000000ffU) << 24))
122
123#define __bswap16_constant(x)	\
124    ((((x) & 0xff00) >> 8) |		\
125     (((x) & 0x00ff) << 8))
126
127#define __bswap16(x)	\
128    ((__uint16_t)(__builtin_constant_p(x) ?	\
129     __bswap16_constant(x) :			\
130     __bswap16_var(x)))
131
132#define __bswap32(x)	\
133    ((__uint32_t)(__builtin_constant_p(x) ? 	\
134     __bswap32_constant(x) :			\
135     __bswap32_var(x)))
136
137#else
138#define __bswap16(x)	__bswap16_var(x)
139#define __bswap32(x)	__bswap32_var(x)
140
141#endif /* __OPTIMIZE__ */
142#endif /* !_ENDIAN_H_ */
143