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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 : : * The "... p" macros, like le64_to_cpup, can be used with pointers
9 : : * to unaligned data, but there will be a performance penalty on
10 : : * some architectures. Use get_unaligned for unaligned data.
11 : : *
12 : : * Francois-Rene Rideau <fare@tunes.org> 19970707
13 : : * gathered all the good ideas from all asm-foo/byteorder.h into one file,
14 : : * cleaned them up.
15 : : * I hope it is compliant with non-GCC compilers.
16 : : * I decided to put __BYTEORDER_HAS_U64__ in byteorder.h,
17 : : * because I wasn't sure it would be ok to put it in types.h
18 : : * Upgraded it to 2.1.43
19 : : * Francois-Rene Rideau <fare@tunes.org> 19971012
20 : : * Upgraded it to 2.1.57
21 : : * to please Linus T., replaced huge #ifdef's between little/big endian
22 : : * by nestedly #include'd files.
23 : : * Francois-Rene Rideau <fare@tunes.org> 19971205
24 : : * Made it to 2.1.71; now a facelift:
25 : : * Put files under include/linux/byteorder/
26 : : * Split swab from generic support.
27 : : *
28 : : * TODO:
29 : : * = Regular kernel maintainers could also replace all these manual
30 : : * byteswap macros that remain, disseminated among drivers,
31 : : * after some grep or the sources...
32 : : * = Linus might want to rename all these macros and files to fit his taste,
33 : : * to fit his personal naming scheme.
34 : : * = it seems that a few drivers would also appreciate
35 : : * nybble swapping support...
36 : : * = every architecture could add their byteswap macro in asm/byteorder.h
37 : : * see how some architectures already do (i386, alpha, ppc, etc)
38 : : * = cpu_to_beXX and beXX_to_cpu might some day need to be well
39 : : * distinguished throughout the kernel. This is not the case currently,
40 : : * since little endian, big endian, and pdp endian machines needn't it.
41 : : * But this might be the case for, say, a port of Linux to 20/21 bit
42 : : * architectures (and F21 Linux addict around?).
43 : : */
44 : :
45 : : /*
46 : : * The following macros are to be defined by <asm/byteorder.h>:
47 : : *
48 : : * Conversion of long and short int between network and host format
49 : : * ntohl(__u32 x)
50 : : * ntohs(__u16 x)
51 : : * htonl(__u32 x)
52 : : * htons(__u16 x)
53 : : * It seems that some programs (which? where? or perhaps a standard? POSIX?)
54 : : * might like the above to be functions, not macros (why?).
55 : : * if that's true, then detect them, and take measures.
56 : : * Anyway, the measure is: define only ___ntohl as a macro instead,
57 : : * and in a separate file, have
58 : : * unsigned long inline ntohl(x){return ___ntohl(x);}
59 : : *
60 : : * The same for constant arguments
61 : : * __constant_ntohl(__u32 x)
62 : : * __constant_ntohs(__u16 x)
63 : : * __constant_htonl(__u32 x)
64 : : * __constant_htons(__u16 x)
65 : : *
66 : : * Conversion of XX-bit integers (16- 32- or 64-)
67 : : * between native CPU format and little/big endian format
68 : : * 64-bit stuff only defined for proper architectures
69 : : * cpu_to_[bl]eXX(__uXX x)
70 : : * [bl]eXX_to_cpu(__uXX x)
71 : : *
72 : : * The same, but takes a pointer to the value to convert
73 : : * cpu_to_[bl]eXXp(__uXX x)
74 : : * [bl]eXX_to_cpup(__uXX x)
75 : : *
76 : : * The same, but change in situ
77 : : * cpu_to_[bl]eXXs(__uXX x)
78 : : * [bl]eXX_to_cpus(__uXX x)
79 : : *
80 : : * See asm-foo/byteorder.h for examples of how to provide
81 : : * architecture-optimized versions
82 : : *
83 : : */
84 : :
85 : : #define cpu_to_le64 __cpu_to_le64
86 : : #define le64_to_cpu __le64_to_cpu
87 : : #define cpu_to_le32 __cpu_to_le32
88 : : #define le32_to_cpu __le32_to_cpu
89 : : #define cpu_to_le16 __cpu_to_le16
90 : : #define le16_to_cpu __le16_to_cpu
91 : : #define cpu_to_be64 __cpu_to_be64
92 : : #define be64_to_cpu __be64_to_cpu
93 : : #define cpu_to_be32 __cpu_to_be32
94 : : #define be32_to_cpu __be32_to_cpu
95 : : #define cpu_to_be16 __cpu_to_be16
96 : : #define be16_to_cpu __be16_to_cpu
97 : : #define cpu_to_le64p __cpu_to_le64p
98 : : #define le64_to_cpup __le64_to_cpup
99 : : #define cpu_to_le32p __cpu_to_le32p
100 : : #define le32_to_cpup __le32_to_cpup
101 : : #define cpu_to_le16p __cpu_to_le16p
102 : : #define le16_to_cpup __le16_to_cpup
103 : : #define cpu_to_be64p __cpu_to_be64p
104 : : #define be64_to_cpup __be64_to_cpup
105 : : #define cpu_to_be32p __cpu_to_be32p
106 : : #define be32_to_cpup __be32_to_cpup
107 : : #define cpu_to_be16p __cpu_to_be16p
108 : : #define be16_to_cpup __be16_to_cpup
109 : : #define cpu_to_le64s __cpu_to_le64s
110 : : #define le64_to_cpus __le64_to_cpus
111 : : #define cpu_to_le32s __cpu_to_le32s
112 : : #define le32_to_cpus __le32_to_cpus
113 : : #define cpu_to_le16s __cpu_to_le16s
114 : : #define le16_to_cpus __le16_to_cpus
115 : : #define cpu_to_be64s __cpu_to_be64s
116 : : #define be64_to_cpus __be64_to_cpus
117 : : #define cpu_to_be32s __cpu_to_be32s
118 : : #define be32_to_cpus __be32_to_cpus
119 : : #define cpu_to_be16s __cpu_to_be16s
120 : : #define be16_to_cpus __be16_to_cpus
121 : :
122 : : /*
123 : : * They have to be macros in order to do the constant folding
124 : : * correctly - if the argument passed into a inline function
125 : : * it is no longer constant according to gcc..
126 : : */
127 : :
128 : : #undef ntohl
129 : : #undef ntohs
130 : : #undef htonl
131 : : #undef htons
132 : :
133 : : #define ___htonl(x) __cpu_to_be32(x)
134 : : #define ___htons(x) __cpu_to_be16(x)
135 : : #define ___ntohl(x) __be32_to_cpu(x)
136 : : #define ___ntohs(x) __be16_to_cpu(x)
137 : :
138 : : #define htonl(x) ___htonl(x)
139 : : #define ntohl(x) ___ntohl(x)
140 : : #define htons(x) ___htons(x)
141 : : #define ntohs(x) ___ntohs(x)
142 : :
143 : : static inline void le16_add_cpu(__le16 *var, u16 val)
144 : : {
145 : 126847 : *var = cpu_to_le16(le16_to_cpu(*var) + val);
146 : : }
147 : :
148 : : static inline void le32_add_cpu(__le32 *var, u32 val)
149 : : {
150 : 0 : *var = cpu_to_le32(le32_to_cpu(*var) + val);
151 : : }
152 : :
153 : : static inline void le64_add_cpu(__le64 *var, u64 val)
154 : : {
155 : : *var = cpu_to_le64(le64_to_cpu(*var) + val);
156 : : }
157 : :
158 : : static inline void be16_add_cpu(__be16 *var, u16 val)
159 : : {
160 : : *var = cpu_to_be16(be16_to_cpu(*var) + val);
161 : : }
162 : :
163 : : static inline void be32_add_cpu(__be32 *var, u32 val)
164 : : {
165 : : *var = cpu_to_be32(be32_to_cpu(*var) + val);
166 : : }
167 : :
168 : : static inline void be64_add_cpu(__be64 *var, u64 val)
169 : : {
170 : : *var = cpu_to_be64(be64_to_cpu(*var) + val);
171 : : }
172 : :
173 : : #endif /* _LINUX_BYTEORDER_GENERIC_H */
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