2 * Copyright (c) 2008, 2010, 2011 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #define BYTE_ORDER_H 1
19 #include <arpa/inet.h>
20 #include <sys/types.h>
22 #include "openvswitch/types.h"
24 static inline ovs_be64
27 return htonl(1) == 1 ? n : ((uint64_t) htonl(n) << 32) | htonl(n >> 32);
30 static inline uint64_t
33 return htonl(1) == 1 ? n : ((uint64_t) ntohl(n) << 32) | ntohl(n >> 32);
36 /* These macros may substitute for htons(), htonl(), and htonll() in contexts
37 * where function calls are not allowed, such as case labels. They should not
38 * be used elsewhere because all of them evaluate their argument many times. */
39 #ifdef WORDS_BIGENDIAN
40 #define CONSTANT_HTONS(VALUE) ((ovs_be16) (VALUE))
41 #define CONSTANT_HTONL(VALUE) ((ovs_be32) (VALUE))
42 #define CONSTANT_HTONLL(VALUE) ((ovs_be64) (VALUE))
44 #define CONSTANT_HTONS(VALUE) \
45 (((((ovs_be16) (VALUE)) & 0xff00) >> 8) | \
46 ((((ovs_be16) (VALUE)) & 0x00ff) << 8))
47 #define CONSTANT_HTONL(VALUE) \
48 (((((ovs_be32) (VALUE)) & 0x000000ff) << 24) | \
49 ((((ovs_be32) (VALUE)) & 0x0000ff00) << 8) | \
50 ((((ovs_be32) (VALUE)) & 0x00ff0000) >> 8) | \
51 ((((ovs_be32) (VALUE)) & 0xff000000) >> 24))
52 #define CONSTANT_HTONLL(VALUE) \
53 (((((ovs_be64) (VALUE)) & UINT64_C(0x00000000000000ff)) << 56) | \
54 ((((ovs_be64) (VALUE)) & UINT64_C(0x000000000000ff00)) << 40) | \
55 ((((ovs_be64) (VALUE)) & UINT64_C(0x0000000000ff0000)) << 24) | \
56 ((((ovs_be64) (VALUE)) & UINT64_C(0x00000000ff000000)) << 8) | \
57 ((((ovs_be64) (VALUE)) & UINT64_C(0x000000ff00000000)) >> 8) | \
58 ((((ovs_be64) (VALUE)) & UINT64_C(0x0000ff0000000000)) >> 24) | \
59 ((((ovs_be64) (VALUE)) & UINT64_C(0x00ff000000000000)) >> 40) | \
60 ((((ovs_be64) (VALUE)) & UINT64_C(0xff00000000000000)) >> 56))
63 #endif /* byte-order.h */