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Linux/include/linux/byteorder/generic.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_BYTEORDER_GENERIC_H
  3 #define _LINUX_BYTEORDER_GENERIC_H
  4 
  5 /*
  6  * linux/byteorder/generic.h
  7  * Generic Byte-reordering support
  8  *
  9  * The "... p" macros, like le64_to_cpup, can be used with pointers
 10  * to unaligned data, but there will be a performance penalty on 
 11  * some architectures.  Use get_unaligned for unaligned data.
 12  *
 13  * Francois-Rene Rideau <fare@tunes.org> 19970707
 14  *    gathered all the good ideas from all asm-foo/byteorder.h into one file,
 15  *    cleaned them up.
 16  *    I hope it is compliant with non-GCC compilers.
 17  *    I decided to put __BYTEORDER_HAS_U64__ in byteorder.h,
 18  *    because I wasn't sure it would be ok to put it in types.h
 19  *    Upgraded it to 2.1.43
 20  * Francois-Rene Rideau <fare@tunes.org> 19971012
 21  *    Upgraded it to 2.1.57
 22  *    to please Linus T., replaced huge #ifdef's between little/big endian
 23  *    by nestedly #include'd files.
 24  * Francois-Rene Rideau <fare@tunes.org> 19971205
 25  *    Made it to 2.1.71; now a facelift:
 26  *    Put files under include/linux/byteorder/
 27  *    Split swab from generic support.
 28  *
 29  * TODO:
 30  *   = Regular kernel maintainers could also replace all these manual
 31  *    byteswap macros that remain, disseminated among drivers,
 32  *    after some grep or the sources...
 33  *   = Linus might want to rename all these macros and files to fit his taste,
 34  *    to fit his personal naming scheme.
 35  *   = it seems that a few drivers would also appreciate
 36  *    nybble swapping support...
 37  *   = every architecture could add their byteswap macro in asm/byteorder.h
 38  *    see how some architectures already do (i386, alpha, ppc, etc)
 39  *   = cpu_to_beXX and beXX_to_cpu might some day need to be well
 40  *    distinguished throughout the kernel. This is not the case currently,
 41  *    since little endian, big endian, and pdp endian machines needn't it.
 42  *    But this might be the case for, say, a port of Linux to 20/21 bit
 43  *    architectures (and F21 Linux addict around?).
 44  */
 45 
 46 /*
 47  * The following macros are to be defined by <asm/byteorder.h>:
 48  *
 49  * Conversion of long and short int between network and host format
 50  *      ntohl(__u32 x)
 51  *      ntohs(__u16 x)
 52  *      htonl(__u32 x)
 53  *      htons(__u16 x)
 54  * It seems that some programs (which? where? or perhaps a standard? POSIX?)
 55  * might like the above to be functions, not macros (why?).
 56  * if that's true, then detect them, and take measures.
 57  * Anyway, the measure is: define only ___ntohl as a macro instead,
 58  * and in a separate file, have
 59  * unsigned long inline ntohl(x){return ___ntohl(x);}
 60  *
 61  * The same for constant arguments
 62  *      __constant_ntohl(__u32 x)
 63  *      __constant_ntohs(__u16 x)
 64  *      __constant_htonl(__u32 x)
 65  *      __constant_htons(__u16 x)
 66  *
 67  * Conversion of XX-bit integers (16- 32- or 64-)
 68  * between native CPU format and little/big endian format
 69  * 64-bit stuff only defined for proper architectures
 70  *      cpu_to_[bl]eXX(__uXX x)
 71  *      [bl]eXX_to_cpu(__uXX x)
 72  *
 73  * The same, but takes a pointer to the value to convert
 74  *      cpu_to_[bl]eXXp(__uXX x)
 75  *      [bl]eXX_to_cpup(__uXX x)
 76  *
 77  * The same, but change in situ
 78  *      cpu_to_[bl]eXXs(__uXX x)
 79  *      [bl]eXX_to_cpus(__uXX x)
 80  *
 81  * See asm-foo/byteorder.h for examples of how to provide
 82  * architecture-optimized versions
 83  *
 84  */
 85 
 86 #define cpu_to_le64 __cpu_to_le64
 87 #define le64_to_cpu __le64_to_cpu
 88 #define cpu_to_le32 __cpu_to_le32
 89 #define le32_to_cpu __le32_to_cpu
 90 #define cpu_to_le16 __cpu_to_le16
 91 #define le16_to_cpu __le16_to_cpu
 92 #define cpu_to_be64 __cpu_to_be64
 93 #define be64_to_cpu __be64_to_cpu
 94 #define cpu_to_be32 __cpu_to_be32
 95 #define be32_to_cpu __be32_to_cpu
 96 #define cpu_to_be16 __cpu_to_be16
 97 #define be16_to_cpu __be16_to_cpu
 98 #define cpu_to_le64p __cpu_to_le64p
 99 #define le64_to_cpup __le64_to_cpup
100 #define cpu_to_le32p __cpu_to_le32p
101 #define le32_to_cpup __le32_to_cpup
102 #define cpu_to_le16p __cpu_to_le16p
103 #define le16_to_cpup __le16_to_cpup
104 #define cpu_to_be64p __cpu_to_be64p
105 #define be64_to_cpup __be64_to_cpup
106 #define cpu_to_be32p __cpu_to_be32p
107 #define be32_to_cpup __be32_to_cpup
108 #define cpu_to_be16p __cpu_to_be16p
109 #define be16_to_cpup __be16_to_cpup
110 #define cpu_to_le64s __cpu_to_le64s
111 #define le64_to_cpus __le64_to_cpus
112 #define cpu_to_le32s __cpu_to_le32s
113 #define le32_to_cpus __le32_to_cpus
114 #define cpu_to_le16s __cpu_to_le16s
115 #define le16_to_cpus __le16_to_cpus
116 #define cpu_to_be64s __cpu_to_be64s
117 #define be64_to_cpus __be64_to_cpus
118 #define cpu_to_be32s __cpu_to_be32s
119 #define be32_to_cpus __be32_to_cpus
120 #define cpu_to_be16s __cpu_to_be16s
121 #define be16_to_cpus __be16_to_cpus
122 
123 /*
124  * They have to be macros in order to do the constant folding
125  * correctly - if the argument passed into a inline function
126  * it is no longer constant according to gcc..
127  */
128 
129 #undef ntohl
130 #undef ntohs
131 #undef htonl
132 #undef htons
133 
134 #define ___htonl(x) __cpu_to_be32(x)
135 #define ___htons(x) __cpu_to_be16(x)
136 #define ___ntohl(x) __be32_to_cpu(x)
137 #define ___ntohs(x) __be16_to_cpu(x)
138 
139 #define htonl(x) ___htonl(x)
140 #define ntohl(x) ___ntohl(x)
141 #define htons(x) ___htons(x)
142 #define ntohs(x) ___ntohs(x)
143 
144 static inline void le16_add_cpu(__le16 *var, u16 val)
145 {
146         *var = cpu_to_le16(le16_to_cpu(*var) + val);
147 }
148 
149 static inline void le32_add_cpu(__le32 *var, u32 val)
150 {
151         *var = cpu_to_le32(le32_to_cpu(*var) + val);
152 }
153 
154 static inline void le64_add_cpu(__le64 *var, u64 val)
155 {
156         *var = cpu_to_le64(le64_to_cpu(*var) + val);
157 }
158 
159 /* XXX: this stuff can be optimized */
160 static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
161 {
162         while (words--) {
163                 __le32_to_cpus(buf);
164                 buf++;
165         }
166 }
167 
168 static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
169 {
170         while (words--) {
171                 __cpu_to_le32s(buf);
172                 buf++;
173         }
174 }
175 
176 static inline void be16_add_cpu(__be16 *var, u16 val)
177 {
178         *var = cpu_to_be16(be16_to_cpu(*var) + val);
179 }
180 
181 static inline void be32_add_cpu(__be32 *var, u32 val)
182 {
183         *var = cpu_to_be32(be32_to_cpu(*var) + val);
184 }
185 
186 static inline void be64_add_cpu(__be64 *var, u64 val)
187 {
188         *var = cpu_to_be64(be64_to_cpu(*var) + val);
189 }
190 
191 static inline void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len)
192 {
193         int i;
194 
195         for (i = 0; i < len; i++)
196                 dst[i] = cpu_to_be32(src[i]);
197 }
198 
199 static inline void be32_to_cpu_array(u32 *dst, const __be32 *src, size_t len)
200 {
201         int i;
202 
203         for (i = 0; i < len; i++)
204                 dst[i] = be32_to_cpu(src[i]);
205 }
206 
207 #endif /* _LINUX_BYTEORDER_GENERIC_H */
208 

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