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207 lines
6.1 KiB
207 lines
6.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_BYTEORDER_GENERIC_H |
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#define _LINUX_BYTEORDER_GENERIC_H |
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/* |
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* linux/byteorder/generic.h |
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* Generic Byte-reordering support |
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* |
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* The "... p" macros, like le64_to_cpup, can be used with pointers |
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* to unaligned data, but there will be a performance penalty on |
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* some architectures. Use get_unaligned for unaligned data. |
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* |
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* Francois-Rene Rideau <[email protected]> 19970707 |
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* gathered all the good ideas from all asm-foo/byteorder.h into one file, |
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* cleaned them up. |
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* I hope it is compliant with non-GCC compilers. |
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* I decided to put __BYTEORDER_HAS_U64__ in byteorder.h, |
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* because I wasn't sure it would be ok to put it in types.h |
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* Upgraded it to 2.1.43 |
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* Francois-Rene Rideau <[email protected]> 19971012 |
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* Upgraded it to 2.1.57 |
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* to please Linus T., replaced huge #ifdef's between little/big endian |
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* by nestedly #include'd files. |
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* Francois-Rene Rideau <[email protected]> 19971205 |
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* Made it to 2.1.71; now a facelift: |
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* Put files under include/linux/byteorder/ |
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* Split swab from generic support. |
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* |
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* TODO: |
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* = Regular kernel maintainers could also replace all these manual |
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* byteswap macros that remain, disseminated among drivers, |
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* after some grep or the sources... |
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* = Linus might want to rename all these macros and files to fit his taste, |
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* to fit his personal naming scheme. |
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* = it seems that a few drivers would also appreciate |
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* nybble swapping support... |
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* = every architecture could add their byteswap macro in asm/byteorder.h |
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* see how some architectures already do (i386, alpha, ppc, etc) |
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* = cpu_to_beXX and beXX_to_cpu might some day need to be well |
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* distinguished throughout the kernel. This is not the case currently, |
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* since little endian, big endian, and pdp endian machines needn't it. |
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* But this might be the case for, say, a port of Linux to 20/21 bit |
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* architectures (and F21 Linux addict around?). |
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*/ |
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/* |
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* The following macros are to be defined by <asm/byteorder.h>: |
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* |
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* Conversion of long and short int between network and host format |
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* ntohl(__u32 x) |
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* ntohs(__u16 x) |
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* htonl(__u32 x) |
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* htons(__u16 x) |
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* It seems that some programs (which? where? or perhaps a standard? POSIX?) |
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* might like the above to be functions, not macros (why?). |
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* if that's true, then detect them, and take measures. |
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* Anyway, the measure is: define only ___ntohl as a macro instead, |
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* and in a separate file, have |
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* unsigned long inline ntohl(x){return ___ntohl(x);} |
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* |
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* The same for constant arguments |
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* __constant_ntohl(__u32 x) |
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* __constant_ntohs(__u16 x) |
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* __constant_htonl(__u32 x) |
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* __constant_htons(__u16 x) |
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* |
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* Conversion of XX-bit integers (16- 32- or 64-) |
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* between native CPU format and little/big endian format |
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* 64-bit stuff only defined for proper architectures |
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* cpu_to_[bl]eXX(__uXX x) |
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* [bl]eXX_to_cpu(__uXX x) |
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* |
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* The same, but takes a pointer to the value to convert |
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* cpu_to_[bl]eXXp(__uXX x) |
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* [bl]eXX_to_cpup(__uXX x) |
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* |
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* The same, but change in situ |
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* cpu_to_[bl]eXXs(__uXX x) |
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* [bl]eXX_to_cpus(__uXX x) |
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* |
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* See asm-foo/byteorder.h for examples of how to provide |
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* architecture-optimized versions |
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* |
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*/ |
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#define cpu_to_le64 __cpu_to_le64 |
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#define le64_to_cpu __le64_to_cpu |
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#define cpu_to_le32 __cpu_to_le32 |
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#define le32_to_cpu __le32_to_cpu |
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#define cpu_to_le16 __cpu_to_le16 |
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#define le16_to_cpu __le16_to_cpu |
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#define cpu_to_be64 __cpu_to_be64 |
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#define be64_to_cpu __be64_to_cpu |
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#define cpu_to_be32 __cpu_to_be32 |
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#define be32_to_cpu __be32_to_cpu |
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#define cpu_to_be16 __cpu_to_be16 |
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#define be16_to_cpu __be16_to_cpu |
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#define cpu_to_le64p __cpu_to_le64p |
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#define le64_to_cpup __le64_to_cpup |
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#define cpu_to_le32p __cpu_to_le32p |
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#define le32_to_cpup __le32_to_cpup |
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#define cpu_to_le16p __cpu_to_le16p |
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#define le16_to_cpup __le16_to_cpup |
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#define cpu_to_be64p __cpu_to_be64p |
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#define be64_to_cpup __be64_to_cpup |
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#define cpu_to_be32p __cpu_to_be32p |
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#define be32_to_cpup __be32_to_cpup |
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#define cpu_to_be16p __cpu_to_be16p |
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#define be16_to_cpup __be16_to_cpup |
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#define cpu_to_le64s __cpu_to_le64s |
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#define le64_to_cpus __le64_to_cpus |
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#define cpu_to_le32s __cpu_to_le32s |
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#define le32_to_cpus __le32_to_cpus |
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#define cpu_to_le16s __cpu_to_le16s |
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#define le16_to_cpus __le16_to_cpus |
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#define cpu_to_be64s __cpu_to_be64s |
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#define be64_to_cpus __be64_to_cpus |
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#define cpu_to_be32s __cpu_to_be32s |
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#define be32_to_cpus __be32_to_cpus |
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#define cpu_to_be16s __cpu_to_be16s |
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#define be16_to_cpus __be16_to_cpus |
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/* |
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* They have to be macros in order to do the constant folding |
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* correctly - if the argument passed into a inline function |
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* it is no longer constant according to gcc.. |
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*/ |
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#undef ntohl |
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#undef ntohs |
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#undef htonl |
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#undef htons |
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#define ___htonl(x) __cpu_to_be32(x) |
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#define ___htons(x) __cpu_to_be16(x) |
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#define ___ntohl(x) __be32_to_cpu(x) |
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#define ___ntohs(x) __be16_to_cpu(x) |
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#define htonl(x) ___htonl(x) |
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#define ntohl(x) ___ntohl(x) |
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#define htons(x) ___htons(x) |
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#define ntohs(x) ___ntohs(x) |
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static inline void le16_add_cpu(__le16 *var, u16 val) |
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{ |
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*var = cpu_to_le16(le16_to_cpu(*var) + val); |
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} |
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static inline void le32_add_cpu(__le32 *var, u32 val) |
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{ |
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*var = cpu_to_le32(le32_to_cpu(*var) + val); |
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} |
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static inline void le64_add_cpu(__le64 *var, u64 val) |
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{ |
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*var = cpu_to_le64(le64_to_cpu(*var) + val); |
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} |
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/* XXX: this stuff can be optimized */ |
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static inline void le32_to_cpu_array(u32 *buf, unsigned int words) |
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{ |
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while (words--) { |
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__le32_to_cpus(buf); |
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buf++; |
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} |
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} |
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static inline void cpu_to_le32_array(u32 *buf, unsigned int words) |
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{ |
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while (words--) { |
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__cpu_to_le32s(buf); |
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buf++; |
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} |
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} |
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static inline void be16_add_cpu(__be16 *var, u16 val) |
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{ |
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*var = cpu_to_be16(be16_to_cpu(*var) + val); |
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} |
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static inline void be32_add_cpu(__be32 *var, u32 val) |
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{ |
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*var = cpu_to_be32(be32_to_cpu(*var) + val); |
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} |
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static inline void be64_add_cpu(__be64 *var, u64 val) |
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{ |
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*var = cpu_to_be64(be64_to_cpu(*var) + val); |
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} |
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static inline void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len) |
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{ |
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int i; |
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for (i = 0; i < len; i++) |
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dst[i] = cpu_to_be32(src[i]); |
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} |
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static inline void be32_to_cpu_array(u32 *dst, const __be32 *src, size_t len) |
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{ |
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int i; |
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for (i = 0; i < len; i++) |
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dst[i] = be32_to_cpu(src[i]); |
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} |
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#endif /* _LINUX_BYTEORDER_GENERIC_H */
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