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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 7a1b07eef94c7e1c6eebccd2b8a258f9a56991b9 / . / include / linux / unaligned / generic.h
blob: cc688e1eb1c4e9186c61d9f9dfa022a2a0bd2e49 [file] [log] [blame]
Stefan Roeseb1b4e892009-03-19 15:34:56 +0100[diff] [blame]1#ifndef _LINUX_UNALIGNED_GENERIC_H
2#define _LINUX_UNALIGNED_GENERIC_H
3
4/* define __force to nothing in U-Boot */
5#define __force
6
7/*
8 * Cause a link-time error if we try an unaligned access other than
9 * 1,2,4 or 8 bytes long
10 */
11extern void __bad_unaligned_access_size(void);
12
13#define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({ \
14 __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \
15 __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)), \
16 __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)), \
17 __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)), \
18 __bad_unaligned_access_size())))); \
19 }))
20
21#define __get_unaligned_be(ptr) ((__force typeof(*(ptr)))({ \
22 __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \
23 __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)), \
24 __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)), \
25 __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)), \
26 __bad_unaligned_access_size())))); \
27 }))
28
29#define __put_unaligned_le(val, ptr) ({ \
30 void *__gu_p = (ptr); \
31 switch (sizeof(*(ptr))) { \
32 case 1: \
33 *(u8 *)__gu_p = (__force u8)(val); \
34 break; \
35 case 2: \
36 put_unaligned_le16((__force u16)(val), __gu_p); \
37 break; \
38 case 4: \
39 put_unaligned_le32((__force u32)(val), __gu_p); \
40 break; \
41 case 8: \
42 put_unaligned_le64((__force u64)(val), __gu_p); \
43 break; \
44 default: \
45 __bad_unaligned_access_size(); \
46 break; \
47 } \
48 (void)0; })
49
50#define __put_unaligned_be(val, ptr) ({ \
51 void *__gu_p = (ptr); \
52 switch (sizeof(*(ptr))) { \
53 case 1: \
54 *(u8 *)__gu_p = (__force u8)(val); \
55 break; \
56 case 2: \
57 put_unaligned_be16((__force u16)(val), __gu_p); \
58 break; \
59 case 4: \
60 put_unaligned_be32((__force u32)(val), __gu_p); \
61 break; \
62 case 8: \
63 put_unaligned_be64((__force u64)(val), __gu_p); \
64 break; \
65 default: \
66 __bad_unaligned_access_size(); \
67 break; \
68 } \
69 (void)0; })
70
71#endif /* _LINUX_UNALIGNED_GENERIC_H */