Subversion Repositories shark

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
424 giacomo 1
#ifndef _LINUX_BYTEORDER_GENERIC_H
2
#define _LINUX_BYTEORDER_GENERIC_H
3
 
4
/*
5
 * linux/byteorder_generic.h
6
 * Generic Byte-reordering support
7
 *
8
 * Francois-Rene Rideau <fare@tunes.org> 19970707
9
 *    gathered all the good ideas from all asm-foo/byteorder.h into one file,
10
 *    cleaned them up.
11
 *    I hope it is compliant with non-GCC compilers.
12
 *    I decided to put __BYTEORDER_HAS_U64__ in byteorder.h,
13
 *    because I wasn't sure it would be ok to put it in types.h
14
 *    Upgraded it to 2.1.43
15
 * Francois-Rene Rideau <fare@tunes.org> 19971012
16
 *    Upgraded it to 2.1.57
17
 *    to please Linus T., replaced huge #ifdef's between little/big endian
18
 *    by nestedly #include'd files.
19
 * Francois-Rene Rideau <fare@tunes.org> 19971205
20
 *    Made it to 2.1.71; now a facelift:
21
 *    Put files under include/linux/byteorder/
22
 *    Split swab from generic support.
23
 *
24
 * TODO:
25
 *   = Regular kernel maintainers could also replace all these manual
26
 *    byteswap macros that remain, disseminated among drivers,
27
 *    after some grep or the sources...
28
 *   = Linus might want to rename all these macros and files to fit his taste,
29
 *    to fit his personal naming scheme.
30
 *   = it seems that a few drivers would also appreciate
31
 *    nybble swapping support...
32
 *   = every architecture could add their byteswap macro in asm/byteorder.h
33
 *    see how some architectures already do (i386, alpha, ppc, etc)
34
 *   = cpu_to_beXX and beXX_to_cpu might some day need to be well
35
 *    distinguished throughout the kernel. This is not the case currently,
36
 *    since little endian, big endian, and pdp endian machines needn't it.
37
 *    But this might be the case for, say, a port of Linux to 20/21 bit
38
 *    architectures (and F21 Linux addict around?).
39
 */
40
 
41
/*
42
 * The following macros are to be defined by <asm/byteorder.h>:
43
 *
44
 * Conversion of long and short int between network and host format
45
 *      ntohl(__u32 x)
46
 *      ntohs(__u16 x)
47
 *      htonl(__u32 x)
48
 *      htons(__u16 x)
49
 * It seems that some programs (which? where? or perhaps a standard? POSIX?)
50
 * might like the above to be functions, not macros (why?).
51
 * if that's true, then detect them, and take measures.
52
 * Anyway, the measure is: define only ___ntohl as a macro instead,
53
 * and in a separate file, have
54
 * unsigned long inline ntohl(x){return ___ntohl(x);}
55
 *
56
 * The same for constant arguments
57
 *      __constant_ntohl(__u32 x)
58
 *      __constant_ntohs(__u16 x)
59
 *      __constant_htonl(__u32 x)
60
 *      __constant_htons(__u16 x)
61
 *
62
 * Conversion of XX-bit integers (16- 32- or 64-)
63
 * between native CPU format and little/big endian format
64
 * 64-bit stuff only defined for proper architectures
65
 *      cpu_to_[bl]eXX(__uXX x)
66
 *      [bl]eXX_to_cpu(__uXX x)
67
 *
68
 * The same, but takes a pointer to the value to convert
69
 *      cpu_to_[bl]eXXp(__uXX x)
70
 *      [bl]eXX_to_cpup(__uXX x)
71
 *
72
 * The same, but change in situ
73
 *      cpu_to_[bl]eXXs(__uXX x)
74
 *      [bl]eXX_to_cpus(__uXX x)
75
 *
76
 * See asm-foo/byteorder.h for examples of how to provide
77
 * architecture-optimized versions
78
 *
79
 */
80
 
81
 
82
#if defined(__KERNEL__)
83
/*
84
 * inside the kernel, we can use nicknames;
85
 * outside of it, we must avoid POSIX namespace pollution...
86
 */
87
#define cpu_to_le64 __cpu_to_le64
88
#define le64_to_cpu __le64_to_cpu
89
#define cpu_to_le32 __cpu_to_le32
90
#define le32_to_cpu __le32_to_cpu
91
#define cpu_to_le16 __cpu_to_le16
92
#define le16_to_cpu __le16_to_cpu
93
#define cpu_to_be64 __cpu_to_be64
94
#define be64_to_cpu __be64_to_cpu
95
#define cpu_to_be32 __cpu_to_be32
96
#define be32_to_cpu __be32_to_cpu
97
#define cpu_to_be16 __cpu_to_be16
98
#define be16_to_cpu __be16_to_cpu
99
#define cpu_to_le64p __cpu_to_le64p
100
#define le64_to_cpup __le64_to_cpup
101
#define cpu_to_le32p __cpu_to_le32p
102
#define le32_to_cpup __le32_to_cpup
103
#define cpu_to_le16p __cpu_to_le16p
104
#define le16_to_cpup __le16_to_cpup
105
#define cpu_to_be64p __cpu_to_be64p
106
#define be64_to_cpup __be64_to_cpup
107
#define cpu_to_be32p __cpu_to_be32p
108
#define be32_to_cpup __be32_to_cpup
109
#define cpu_to_be16p __cpu_to_be16p
110
#define be16_to_cpup __be16_to_cpup
111
#define cpu_to_le64s __cpu_to_le64s
112
#define le64_to_cpus __le64_to_cpus
113
#define cpu_to_le32s __cpu_to_le32s
114
#define le32_to_cpus __le32_to_cpus
115
#define cpu_to_le16s __cpu_to_le16s
116
#define le16_to_cpus __le16_to_cpus
117
#define cpu_to_be64s __cpu_to_be64s
118
#define be64_to_cpus __be64_to_cpus
119
#define cpu_to_be32s __cpu_to_be32s
120
#define be32_to_cpus __be32_to_cpus
121
#define cpu_to_be16s __cpu_to_be16s
122
#define be16_to_cpus __be16_to_cpus
123
#endif
124
 
125
 
126
#if defined(__KERNEL__)
127
/*
128
 * Handle ntohl and suches. These have various compatibility
129
 * issues - like we want to give the prototype even though we
130
 * also have a macro for them in case some strange program
131
 * wants to take the address of the thing or something..
132
 *
133
 * Note that these used to return a "long" in libc5, even though
134
 * long is often 64-bit these days.. Thus the casts.
135
 *
136
 * They have to be macros in order to do the constant folding
137
 * correctly - if the argument passed into a inline function
138
 * it is no longer constant according to gcc..
139
 */
140
 
141
#undef ntohl
142
#undef ntohs
143
#undef htonl
144
#undef htons
145
 
146
/*
147
 * Do the prototypes. Somebody might want to take the
148
 * address or some such sick thing..
149
 */
150
extern __u32                    ntohl(__u32);
151
extern __u32                    htonl(__u32);
152
extern unsigned short int       ntohs(unsigned short int);
153
extern unsigned short int       htons(unsigned short int);
154
 
155
#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
156
 
157
#define ___htonl(x) __cpu_to_be32(x)
158
#define ___htons(x) __cpu_to_be16(x)
159
#define ___ntohl(x) __be32_to_cpu(x)
160
#define ___ntohs(x) __be16_to_cpu(x)
161
 
162
#define htonl(x) ___htonl(x)
163
#define ntohl(x) ___ntohl(x)
164
#define htons(x) ___htons(x)
165
#define ntohs(x) ___ntohs(x)
166
 
167
#endif /* OPTIMIZE */
168
 
169
#endif /* KERNEL */
170
 
171
 
172
#endif /* _LINUX_BYTEORDER_GENERIC_H */