blob: b1d570e528ef9215ce9b9d76e8cc20fbb677d380 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
#ifndef _LINUX_BYTEORDER_SWAB_H
#define _LINUX_BYTEORDER_SWAB_H
/*
* linux/byteorder/swab.h
* Byte-swapping, independently from CPU endianness
* swabXX[ps]?(foo)
*
* Francois-Rene Rideau <fare@tunes.org> 19971205
* separated swab functions from cpu_to_XX,
* to clean up support for bizarre-endian architectures.
*
* See asm-i386/byteorder.h and suches for examples of how to provide
* architecture-dependent optimized versions
*
*/
/* casts are necessary for constants, because we never know how for sure
* how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
*/
#define ___swab16(x) \
((__u16)( \
(((__u16)(x) & (__u16)0x00ffU) << 8) | \
(((__u16)(x) & (__u16)0xff00U) >> 8) ))
#define ___swab32(x) \
((__u32)( \
(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
(((__u32)(x) & (__u32)0xff000000UL) >> 24) ))
#define ___swab64(x) \
((__u64)( \
(__u64)(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \
(__u64)(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \
(__u64)(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \
(__u64)(((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \
(__u64)(((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \
(__u64)(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
(__u64)(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \
(__u64)(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56) ))
/*
* provide defaults when no architecture-specific optimization is detected
*/
#ifndef __arch__swab16
# define __arch__swab16(x) ___swab16(x)
#endif
#ifndef __arch__swab32
# define __arch__swab32(x) ___swab32(x)
#endif
#ifndef __arch__swab64
# define __arch__swab64(x) ___swab64(x)
#endif
#ifndef __arch__swab16p
# define __arch__swab16p(x) __swab16(*(x))
#endif
#ifndef __arch__swab32p
# define __arch__swab32p(x) __swab32(*(x))
#endif
#ifndef __arch__swab64p
# define __arch__swab64p(x) __swab64(*(x))
#endif
#ifndef __arch__swab16s
# define __arch__swab16s(x) do { *(x) = __swab16p((x)); } while (0)
#endif
#ifndef __arch__swab32s
# define __arch__swab32s(x) do { *(x) = __swab32p((x)); } while (0)
#endif
#ifndef __arch__swab64s
# define __arch__swab64s(x) do { *(x) = __swab64p((x)); } while (0)
#endif
/*
* Allow constant folding
*/
#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
# define __swab16(x) \
(__builtin_constant_p((__u16)(x)) ? \
___swab16((x)) : \
__fswab16((x)))
# define __swab32(x) \
(__builtin_constant_p((__u32)(x)) ? \
___swab32((x)) : \
__fswab32((x)))
# define __swab64(x) \
(__builtin_constant_p((__u64)(x)) ? \
___swab64((x)) : \
__fswab64((x)))
#else
# define __swab16(x) __fswab16(x)
# define __swab32(x) __fswab32(x)
# define __swab64(x) __fswab64(x)
#endif /* OPTIMIZE */
static __inline__ __attribute__((const)) __u16 __fswab16(__u16 x)
{
return __arch__swab16(x);
}
static __inline__ __u16 __swab16p(__u16 *x)
{
return __arch__swab16p(x);
}
static __inline__ void __swab16s(__u16 *addr)
{
__arch__swab16s(addr);
}
static __inline__ __attribute__((const)) __u32 __fswab32(__u32 x)
{
return __arch__swab32(x);
}
static __inline__ __u32 __swab32p(__u32 *x)
{
return __arch__swab32p(x);
}
static __inline__ void __swab32s(__u32 *addr)
{
__arch__swab32s(addr);
}
#ifdef __BYTEORDER_HAS_U64__
static __inline__ __attribute__((const)) __u64 __fswab64(__u64 x)
{
# ifdef __SWAB_64_THRU_32__
__u32 h = x >> 32;
__u32 l = x & ((1ULL<<32)-1);
return (((__u64)__swab32(l)) << 32) | ((__u64)(__swab32(h)));
# else
return __arch__swab64(x);
# endif
}
static __inline__ __u64 __swab64p(__u64 *x)
{
return __arch__swab64p(x);
}
static __inline__ void __swab64s(__u64 *addr)
{
__arch__swab64s(addr);
}
#endif /* __BYTEORDER_HAS_U64__ */
#if defined(__KERNEL__)
#define swab16 __swab16
#define swab32 __swab32
#define swab64 __swab64
#define swab16p __swab16p
#define swab32p __swab32p
#define swab64p __swab64p
#define swab16s __swab16s
#define swab32s __swab32s
#define swab64s __swab64s
#endif
#endif /* _LINUX_BYTEORDER_SWAB_H */
|
