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#ifndef _LINUX_BYTEORDER_GENERIC_H

#define _LINUX_BYTEORDER_GENERIC_H

/*

 * linux/byteorder_generic.h

 * Generic Byte-reordering support

 *

 * 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

 *

 */

#if defined(__KERNEL__)

/*

 * inside the kernel, we can use nicknames;

 * outside of it, we must avoid POSIX namespace pollution...

 */

#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

#endif

#if defined(__KERNEL__)

/*

 * Handle ntohl and suches. These have various compatibility

 * issues - like we want to give the prototype even though we

 * also have a macro for them in case some strange program

 * wants to take the address of the thing or something..

 *

 * Note that these used to return a "long" in libc5, even though

 * long is often 64-bit these days.. Thus the casts.

 *

 * 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

/*

 * Do the prototypes. Somebody might want to take the

 * address or some such sick thing..

 */

extern __u32                    ntohl(__u32);

extern __u32                    htonl(__u32);

extern unsigned short int       ntohs(unsigned short int);

extern unsigned short int       htons(unsigned short int);

#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)

#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)

#endif /* OPTIMIZE */

#endif /* KERNEL */

#endif /* _LINUX_BYTEORDER_GENERIC_H */