181 lines
5.9 KiB
C
181 lines
5.9 KiB
C
|
#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
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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..
|
||
|
|
*/
|
||
|
|
#if defined(__KERNEL__) || (defined (__GLIBC__) && __GLIBC__ >= 2)
|
||
|
|
extern __u32 ntohl(__u32);
|
||
|
|
extern __u32 htonl(__u32);
|
||
|
|
#else
|
||
|
|
extern unsigned long int ntohl(unsigned long int);
|
||
|
|
extern unsigned long int htonl(unsigned long int);
|
||
|
|
#endif
|
||
|
|
extern unsigned short int ntohs(unsigned short int);
|
||
|
|
extern unsigned short int htons(unsigned short int);
|
||
|
|
|
||
|
|
|
||
|
|
#if defined(__GNUC__) && (__GNUC__ >= 2)
|
||
|
|
|
||
|
|
#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)
|
||
|
|
|
||
|
|
#if defined(__KERNEL__) || (defined (__GLIBC__) && __GLIBC__ >= 2)
|
||
|
|
#define htonl(x) ___htonl(x)
|
||
|
|
#define ntohl(x) ___ntohl(x)
|
||
|
|
#else
|
||
|
|
#define htonl(x) ((unsigned long)___htonl(x))
|
||
|
|
#define ntohl(x) ((unsigned long)___ntohl(x))
|
||
|
|
#endif
|
||
|
|
#define htons(x) ___htons(x)
|
||
|
|
#define ntohs(x) ___ntohs(x)
|
||
|
|
|
||
|
|
#endif /* OPTIMIZE */
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* _LINUX_BYTEORDER_GENERIC_H */
|