Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Ed L. Cashin | e048799 | 2005-09-19 19:57:36 -0700 | [diff] [blame] | 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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Marcin Slusarz | 8b5f688 | 2008-02-08 04:20:12 -0800 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | #endif /* _LINUX_BYTEORDER_GENERIC_H */ |