| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_BYTEORDER_GENERIC_H |
| #define _LINUX_BYTEORDER_GENERIC_H |
| |
| /* |
| * linux/byteorder/generic.h |
| * Generic Byte-reordering support |
| * |
| * The "... p" macros, like le64_to_cpup, can be used with pointers |
| * to unaligned data, but there will be a performance penalty on |
| * some architectures. Use get_unaligned for unaligned data. |
| * |
| * Francois-Rene Rideau <fare@tunes.org> 19970707 |
| * gathered all the good ideas from all asm-foo/byteorder.h into one file, |
| * cleaned them up. |
| * I hope it is compliant with non-GCC compilers. |
| * I decided to put __BYTEORDER_HAS_U64__ in byteorder.h, |
| * because I wasn't sure it would be ok to put it in types.h |
| * Upgraded it to 2.1.43 |
| * Francois-Rene Rideau <fare@tunes.org> 19971012 |
| * Upgraded it to 2.1.57 |
| * to please Linus T., replaced huge #ifdef's between little/big endian |
| * by nestedly #include'd files. |
| * Francois-Rene Rideau <fare@tunes.org> 19971205 |
| * Made it to 2.1.71; now a facelift: |
| * Put files under include/linux/byteorder/ |
| * Split swab from generic support. |
| * |
| * TODO: |
| * = Regular kernel maintainers could also replace all these manual |
| * byteswap macros that remain, disseminated among drivers, |
| * after some grep or the sources... |
| * = Linus might want to rename all these macros and files to fit his taste, |
| * to fit his personal naming scheme. |
| * = it seems that a few drivers would also appreciate |
| * nybble swapping support... |
| * = every architecture could add their byteswap macro in asm/byteorder.h |
| * see how some architectures already do (i386, alpha, ppc, etc) |
| * = cpu_to_beXX and beXX_to_cpu might some day need to be well |
| * distinguished throughout the kernel. This is not the case currently, |
| * since little endian, big endian, and pdp endian machines needn't it. |
| * But this might be the case for, say, a port of Linux to 20/21 bit |
| * architectures (and F21 Linux addict around?). |
| */ |
| |
| /* |
| * The following macros are to be defined by <asm/byteorder.h>: |
| * |
| * Conversion of long and short int between network and host format |
| * ntohl(__u32 x) |
| * ntohs(__u16 x) |
| * htonl(__u32 x) |
| * htons(__u16 x) |
| * It seems that some programs (which? where? or perhaps a standard? POSIX?) |
| * might like the above to be functions, not macros (why?). |
| * if that's true, then detect them, and take measures. |
| * Anyway, the measure is: define only ___ntohl as a macro instead, |
| * and in a separate file, have |
| * unsigned long inline ntohl(x){return ___ntohl(x);} |
| * |
| * The same for constant arguments |
| * __constant_ntohl(__u32 x) |
| * __constant_ntohs(__u16 x) |
| * __constant_htonl(__u32 x) |
| * __constant_htons(__u16 x) |
| * |
| * Conversion of XX-bit integers (16- 32- or 64-) |
| * between native CPU format and little/big endian format |
| * 64-bit stuff only defined for proper architectures |
| * cpu_to_[bl]eXX(__uXX x) |
| * [bl]eXX_to_cpu(__uXX x) |
| * |
| * The same, but takes a pointer to the value to convert |
| * cpu_to_[bl]eXXp(__uXX x) |
| * [bl]eXX_to_cpup(__uXX x) |
| * |
| * The same, but change in situ |
| * cpu_to_[bl]eXXs(__uXX x) |
| * [bl]eXX_to_cpus(__uXX x) |
| * |
| * See asm-foo/byteorder.h for examples of how to provide |
| * architecture-optimized versions |
| * |
| */ |
| |
| #define cpu_to_le64 __cpu_to_le64 |
| #define le64_to_cpu __le64_to_cpu |
| #define cpu_to_le32 __cpu_to_le32 |
| #define le32_to_cpu __le32_to_cpu |
| #define cpu_to_le16 __cpu_to_le16 |
| #define le16_to_cpu __le16_to_cpu |
| #define cpu_to_be64 __cpu_to_be64 |
| #define be64_to_cpu __be64_to_cpu |
| #define cpu_to_be32 __cpu_to_be32 |
| #define be32_to_cpu __be32_to_cpu |
| #define cpu_to_be16 __cpu_to_be16 |
| #define be16_to_cpu __be16_to_cpu |
| #define cpu_to_le64p __cpu_to_le64p |
| #define le64_to_cpup __le64_to_cpup |
| #define cpu_to_le32p __cpu_to_le32p |
| #define le32_to_cpup __le32_to_cpup |
| #define cpu_to_le16p __cpu_to_le16p |
| #define le16_to_cpup __le16_to_cpup |
| #define cpu_to_be64p __cpu_to_be64p |
| #define be64_to_cpup __be64_to_cpup |
| #define cpu_to_be32p __cpu_to_be32p |
| #define be32_to_cpup __be32_to_cpup |
| #define cpu_to_be16p __cpu_to_be16p |
| #define be16_to_cpup __be16_to_cpup |
| #define cpu_to_le64s __cpu_to_le64s |
| #define le64_to_cpus __le64_to_cpus |
| #define cpu_to_le32s __cpu_to_le32s |
| #define le32_to_cpus __le32_to_cpus |
| #define cpu_to_le16s __cpu_to_le16s |
| #define le16_to_cpus __le16_to_cpus |
| #define cpu_to_be64s __cpu_to_be64s |
| #define be64_to_cpus __be64_to_cpus |
| #define cpu_to_be32s __cpu_to_be32s |
| #define be32_to_cpus __be32_to_cpus |
| #define cpu_to_be16s __cpu_to_be16s |
| #define be16_to_cpus __be16_to_cpus |
| |
| /* |
| * They have to be macros in order to do the constant folding |
| * correctly - if the argument passed into a inline function |
| * it is no longer constant according to gcc.. |
| */ |
| |
| #undef ntohl |
| #undef ntohs |
| #undef htonl |
| #undef htons |
| |
| #define ___htonl(x) __cpu_to_be32(x) |
| #define ___htons(x) __cpu_to_be16(x) |
| #define ___ntohl(x) __be32_to_cpu(x) |
| #define ___ntohs(x) __be16_to_cpu(x) |
| |
| #define htonl(x) ___htonl(x) |
| #define ntohl(x) ___ntohl(x) |
| #define htons(x) ___htons(x) |
| #define ntohs(x) ___ntohs(x) |
| |
| static inline void le16_add_cpu(__le16 *var, u16 val) |
| { |
| *var = cpu_to_le16(le16_to_cpu(*var) + val); |
| } |
| |
| static inline void le32_add_cpu(__le32 *var, u32 val) |
| { |
| *var = cpu_to_le32(le32_to_cpu(*var) + val); |
| } |
| |
| static inline void le64_add_cpu(__le64 *var, u64 val) |
| { |
| *var = cpu_to_le64(le64_to_cpu(*var) + val); |
| } |
| |
| static inline void be16_add_cpu(__be16 *var, u16 val) |
| { |
| *var = cpu_to_be16(be16_to_cpu(*var) + val); |
| } |
| |
| static inline void be32_add_cpu(__be32 *var, u32 val) |
| { |
| *var = cpu_to_be32(be32_to_cpu(*var) + val); |
| } |
| |
| static inline void be64_add_cpu(__be64 *var, u64 val) |
| { |
| *var = cpu_to_be64(be64_to_cpu(*var) + val); |
| } |
| |
| #endif /* _LINUX_BYTEORDER_GENERIC_H */ |
