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 *var = cpu_to_le16(le16_to_cpu(*var) + val);
146 }
147
148 static inline void le32_add_cpu(__le32 *var, u32 val)
149 {
150 *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 */
174
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