0,0 → 1,180 |
#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) && 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) |
|
#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 */ |
|
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#endif /* _LINUX_BYTEORDER_GENERIC_H */ |