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afa3a931 BP |
1 | /* |
2 | * Copyright (c) 2010 Nicira Networks. | |
3 | * | |
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: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
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. | |
15 | */ | |
16 | ||
17 | #ifndef UNALIGNED_H | |
18 | #define UNALIGNED_H 1 | |
19 | ||
20 | #include <stdint.h> | |
10a24935 | 21 | #include "byte-order.h" |
9ea5d2d5 | 22 | #include "openvswitch/types.h" |
afa3a931 BP |
23 | |
24 | /* Public API. */ | |
25 | static inline uint16_t get_unaligned_u16(const uint16_t *); | |
26 | static inline uint32_t get_unaligned_u32(const uint32_t *); | |
27 | static inline uint64_t get_unaligned_u64(const uint64_t *); | |
28 | static inline void put_unaligned_u16(uint16_t *, uint16_t); | |
29 | static inline void put_unaligned_u32(uint32_t *, uint32_t); | |
30 | static inline void put_unaligned_u64(uint64_t *, uint64_t); | |
31 | ||
9ea5d2d5 BP |
32 | static inline ovs_be16 get_unaligned_be16(const ovs_be16 *); |
33 | static inline ovs_be32 get_unaligned_be32(const ovs_be32 *); | |
34 | static inline ovs_be64 get_unaligned_be64(const ovs_be64 *); | |
35 | static inline void put_unaligned_be16(ovs_be16 *, ovs_be16); | |
36 | static inline void put_unaligned_be32(ovs_be32 *, ovs_be32); | |
37 | static inline void put_unaligned_be64(ovs_be64 *, ovs_be64); | |
38 | ||
afa3a931 BP |
39 | #ifdef __GNUC__ |
40 | /* GCC implementations. */ | |
9ea5d2d5 BP |
41 | #define GCC_UNALIGNED_ACCESSORS(TYPE, ABBREV) \ |
42 | struct unaligned_##ABBREV { \ | |
43 | TYPE x __attribute__((__packed__)); \ | |
44 | }; \ | |
45 | static inline struct unaligned_##ABBREV * \ | |
46 | unaligned_##ABBREV(const TYPE *p) \ | |
47 | { \ | |
48 | return (struct unaligned_##ABBREV *) p; \ | |
49 | } \ | |
50 | \ | |
51 | static inline TYPE \ | |
52 | get_unaligned_##ABBREV(const TYPE *p) \ | |
53 | { \ | |
54 | return unaligned_##ABBREV(p)->x; \ | |
55 | } \ | |
56 | \ | |
57 | static inline void \ | |
58 | put_unaligned_##ABBREV(TYPE *p, TYPE x) \ | |
59 | { \ | |
60 | unaligned_##ABBREV(p)->x = x; \ | |
afa3a931 BP |
61 | } |
62 | ||
9ea5d2d5 BP |
63 | GCC_UNALIGNED_ACCESSORS(uint16_t, u16); |
64 | GCC_UNALIGNED_ACCESSORS(uint32_t, u32); | |
65 | GCC_UNALIGNED_ACCESSORS(uint64_t, u64); | |
66 | ||
67 | GCC_UNALIGNED_ACCESSORS(ovs_be16, be16); | |
68 | GCC_UNALIGNED_ACCESSORS(ovs_be32, be32); | |
69 | GCC_UNALIGNED_ACCESSORS(ovs_be64, be64); | |
afa3a931 BP |
70 | #else |
71 | /* Generic implementations. */ | |
72 | ||
73 | static inline uint16_t get_unaligned_u16(const uint16_t *p_) | |
74 | { | |
75 | const uint8_t *p = (const uint8_t *) p_; | |
76 | return ntohs((p[0] << 8) | p[1]); | |
77 | } | |
78 | ||
79 | static inline void put_unaligned_u16(uint16_t *p_, uint16_t x_) | |
80 | { | |
81 | uint8_t *p = (uint8_t *) p_; | |
82 | uint16_t x = ntohs(x_); | |
83 | ||
84 | p[0] = x >> 8; | |
85 | p[1] = x; | |
86 | } | |
87 | ||
88 | static inline uint32_t get_unaligned_u32(const uint32_t *p_) | |
89 | { | |
90 | const uint8_t *p = (const uint8_t *) p_; | |
91 | return ntohl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); | |
92 | } | |
93 | ||
94 | static inline void put_unaligned_u32(uint32_t *p_, uint32_t x_) | |
95 | { | |
96 | uint8_t *p = (uint8_t *) p_; | |
97 | uint32_t x = ntohl(x_); | |
98 | ||
99 | p[0] = x >> 24; | |
100 | p[1] = x >> 16; | |
101 | p[2] = x >> 8; | |
102 | p[3] = x; | |
103 | } | |
104 | ||
105 | static inline uint64_t get_unaligned_u64(const uint64_t *p_) | |
106 | { | |
107 | const uint8_t *p = (const uint8_t *) p_; | |
108 | return ntohll(((uint64_t) p[0] << 56) | |
109 | | ((uint64_t) p[1] << 48) | |
110 | | ((uint64_t) p[2] << 40) | |
111 | | ((uint64_t) p[3] << 32) | |
112 | | (p[4] << 24) | |
113 | | (p[5] << 16) | |
114 | | (p[6] << 8) | |
115 | | p[7]); | |
116 | } | |
117 | ||
118 | static inline void put_unaligned_u64(uint64_t *p_, uint64_t x_) | |
119 | { | |
120 | uint8_t *p = (uint8_t *) p_; | |
121 | uint64_t x = ntohll(x_); | |
122 | ||
123 | p[0] = x >> 56; | |
124 | p[1] = x >> 48; | |
125 | p[2] = x >> 40; | |
126 | p[3] = x >> 32; | |
127 | p[4] = x >> 24; | |
128 | p[5] = x >> 16; | |
129 | p[6] = x >> 8; | |
130 | p[7] = x; | |
131 | } | |
9ea5d2d5 BP |
132 | |
133 | /* Only sparse cares about the difference between uint<N>_t and ovs_be<N>, and | |
134 | * that takes the GCC branch, so there's no point in working too hard on these | |
135 | * accessors. */ | |
136 | #define get_unaligned_be16 get_unaligned_u16 | |
137 | #define get_unaligned_be32 get_unaligned_u32 | |
138 | #define get_unaligned_be64 get_unaligned_u64 | |
139 | #define put_unaligned_be16 put_unaligned_u16 | |
140 | #define put_unaligned_be32 put_unaligned_u32 | |
141 | #define put_unaligned_be64 put_unaligned_u64 | |
afa3a931 BP |
142 | #endif |
143 | ||
144 | #endif /* unaligned.h */ |