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endian.hh
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1// Copyright 2005 Caleb Epstein
2// Copyright 2006 John Maddock
3// Copyright 2010 Rene Rivera
4// Distributed under the Boost Software License, Version 1.0. (See accompany-
5// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7/*
8 * Copyright (c) 1997
9 * Silicon Graphics Computer Systems, Inc.
10 *
11 * Permission to use, copy, modify, distribute and sell this software
12 * and its documentation for any purpose is hereby granted without fee,
13 * provided that the above copyright notice appear in all copies and
14 * that both that copyright notice and this permission notice appear
15 * in supporting documentation. Silicon Graphics makes no
16 * representations about the suitability of this software for any
17 * purpose. It is provided "as is" without express or implied warranty.
18 */
19
20/*
21 * Copyright notice reproduced from <sysc/packages/boost/detail/limits.hpp>,
22 * from which this code was originally taken.
23 *
24 * Modified by Caleb Epstein to use <endian.h> with GNU libc and to
25 * defined the SC_BOOST_ENDIAN macro.
26 */
27
28#ifndef __SYSTEMC_EXT_UTILS_ENDIAN_HH__
29#define __SYSTEMC_EXT_UTILS_ENDIAN_HH__
30
31// GNU libc offers the helpful header <endian.h> which defines
32// __BYTE_ORDER
33
34#if defined (__GLIBC__)
35# include <endian.h>
36# if (__BYTE_ORDER == __LITTLE_ENDIAN)
37# define SC_BOOST_LITTLE_ENDIAN
38# elif (__BYTE_ORDER == __BIG_ENDIAN)
39# define SC_BOOST_BIG_ENDIAN
40# elif (__BYTE_ORDER == __PDP_ENDIAN)
41# define SC_BOOST_PDP_ENDIAN
42# else
43# error Unknown machine endianness detected.
44# endif
45# define SC_BOOST_BYTE_ORDER __BYTE_ORDER
46#elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) || \
47 defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__) || \
48 defined(_STLP_BIG_ENDIAN) && !defined(_STLP_LITTLE_ENDIAN)
49# define SC_BOOST_BIG_ENDIAN
50# define SC_BOOST_BYTE_ORDER 4321
51#elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) || \
52 defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__) || \
53 defined(_STLP_LITTLE_ENDIAN) && !defined(_STLP_BIG_ENDIAN)
54# define SC_BOOST_LITTLE_ENDIAN
55# define SC_BOOST_BYTE_ORDER 1234
56#elif defined(__sparc) || defined(__sparc__) \
57 || defined(_POWER) || defined(__powerpc__) \
58 || defined(__ppc__) || defined(__ppc64__) \
59 || defined(__hpux) || defined(__hppa) \
60 || defined(_MIPSEB) || defined(_POWER) \
61 || defined(__s390__)
62# define SC_BOOST_BIG_ENDIAN
63# define SC_BOOST_BYTE_ORDER 4321
64#elif defined(__i386__) || defined(__alpha__) \
65 || defined(__ia64) || defined(__ia64__) \
66 || defined(_M_IX86) || defined(_M_IA64) \
67 || defined(_M_ALPHA) || defined(__amd64) \
68 || defined(__amd64__) || defined(_M_AMD64) \
69 || defined(__x86_64) || defined(__x86_64__) \
70 || defined(_M_X64) || defined(__bfin__) \
71 || defined(__arm__) || defined(__aarch64__)
72
73# define SC_BOOST_LITTLE_ENDIAN
74# define SC_BOOST_BYTE_ORDER 1234
75#else
76# error The file boost/detail/endian.hpp needs to be set up for your CPU type.
77#endif
78
79
80#endif // __SYSTEMC_EXT_UTILS_ENDIAN_HH__
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