gem5  v21.2.1.1
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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