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TOMOYO Linux Cross Reference
Linux/include/linux/byteorder/generic.h

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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         *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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