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/include/linux/byteorder/generic.h

https://github.com/airy09/android_kernel_sony_apq8064
C Header | 173 lines | 75 code | 14 blank | 84 comment | 0 complexity | a47e85ccd010f0f54c8fd90426dbd8f8 MD5 | raw file
  1#ifndef _LINUX_BYTEORDER_GENERIC_H
  2#define _LINUX_BYTEORDER_GENERIC_H
  3
  4/*
  5 * linux/byteorder_generic.h
  6 * Generic Byte-reordering support
  7 *
  8 * The "... p" macros, like le64_to_cpup, can be used with pointers
  9 * to unaligned data, but there will be a performance penalty on 
 10 * some architectures.  Use get_unaligned for unaligned data.
 11 *
 12 * Francois-Rene Rideau <fare@tunes.org> 19970707
 13 *    gathered all the good ideas from all asm-foo/byteorder.h into one file,
 14 *    cleaned them up.
 15 *    I hope it is compliant with non-GCC compilers.
 16 *    I decided to put __BYTEORDER_HAS_U64__ in byteorder.h,
 17 *    because I wasn't sure it would be ok to put it in types.h
 18 *    Upgraded it to 2.1.43
 19 * Francois-Rene Rideau <fare@tunes.org> 19971012
 20 *    Upgraded it to 2.1.57
 21 *    to please Linus T., replaced huge #ifdef's between little/big endian
 22 *    by nestedly #include'd files.
 23 * Francois-Rene Rideau <fare@tunes.org> 19971205
 24 *    Made it to 2.1.71; now a facelift:
 25 *    Put files under include/linux/byteorder/
 26 *    Split swab from generic support.
 27 *
 28 * TODO:
 29 *   = Regular kernel maintainers could also replace all these manual
 30 *    byteswap macros that remain, disseminated among drivers,
 31 *    after some grep or the sources...
 32 *   = Linus might want to rename all these macros and files to fit his taste,
 33 *    to fit his personal naming scheme.
 34 *   = it seems that a few drivers would also appreciate
 35 *    nybble swapping support...
 36 *   = every architecture could add their byteswap macro in asm/byteorder.h
 37 *    see how some architectures already do (i386, alpha, ppc, etc)
 38 *   = cpu_to_beXX and beXX_to_cpu might some day need to be well
 39 *    distinguished throughout the kernel. This is not the case currently,
 40 *    since little endian, big endian, and pdp endian machines needn't it.
 41 *    But this might be the case for, say, a port of Linux to 20/21 bit
 42 *    architectures (and F21 Linux addict around?).
 43 */
 44
 45/*
 46 * The following macros are to be defined by <asm/byteorder.h>:
 47 *
 48 * Conversion of long and short int between network and host format
 49 *	ntohl(__u32 x)
 50 *	ntohs(__u16 x)
 51 *	htonl(__u32 x)
 52 *	htons(__u16 x)
 53 * It seems that some programs (which? where? or perhaps a standard? POSIX?)
 54 * might like the above to be functions, not macros (why?).
 55 * if that's true, then detect them, and take measures.
 56 * Anyway, the measure is: define only ___ntohl as a macro instead,
 57 * and in a separate file, have
 58 * unsigned long inline ntohl(x){return ___ntohl(x);}
 59 *
 60 * The same for constant arguments
 61 *	__constant_ntohl(__u32 x)
 62 *	__constant_ntohs(__u16 x)
 63 *	__constant_htonl(__u32 x)
 64 *	__constant_htons(__u16 x)
 65 *
 66 * Conversion of XX-bit integers (16- 32- or 64-)
 67 * between native CPU format and little/big endian format
 68 * 64-bit stuff only defined for proper architectures
 69 *	cpu_to_[bl]eXX(__uXX x)
 70 *	[bl]eXX_to_cpu(__uXX x)
 71 *
 72 * The same, but takes a pointer to the value to convert
 73 *	cpu_to_[bl]eXXp(__uXX x)
 74 *	[bl]eXX_to_cpup(__uXX x)
 75 *
 76 * The same, but change in situ
 77 *	cpu_to_[bl]eXXs(__uXX x)
 78 *	[bl]eXX_to_cpus(__uXX x)
 79 *
 80 * See asm-foo/byteorder.h for examples of how to provide
 81 * architecture-optimized versions
 82 *
 83 */
 84
 85#define cpu_to_le64 __cpu_to_le64
 86#define le64_to_cpu __le64_to_cpu
 87#define cpu_to_le32 __cpu_to_le32
 88#define le32_to_cpu __le32_to_cpu
 89#define cpu_to_le16 __cpu_to_le16
 90#define le16_to_cpu __le16_to_cpu
 91#define cpu_to_be64 __cpu_to_be64
 92#define be64_to_cpu __be64_to_cpu
 93#define cpu_to_be32 __cpu_to_be32
 94#define be32_to_cpu __be32_to_cpu
 95#define cpu_to_be16 __cpu_to_be16
 96#define be16_to_cpu __be16_to_cpu
 97#define cpu_to_le64p __cpu_to_le64p
 98#define le64_to_cpup __le64_to_cpup
 99#define cpu_to_le32p __cpu_to_le32p
100#define le32_to_cpup __le32_to_cpup
101#define cpu_to_le16p __cpu_to_le16p
102#define le16_to_cpup __le16_to_cpup
103#define cpu_to_be64p __cpu_to_be64p
104#define be64_to_cpup __be64_to_cpup
105#define cpu_to_be32p __cpu_to_be32p
106#define be32_to_cpup __be32_to_cpup
107#define cpu_to_be16p __cpu_to_be16p
108#define be16_to_cpup __be16_to_cpup
109#define cpu_to_le64s __cpu_to_le64s
110#define le64_to_cpus __le64_to_cpus
111#define cpu_to_le32s __cpu_to_le32s
112#define le32_to_cpus __le32_to_cpus
113#define cpu_to_le16s __cpu_to_le16s
114#define le16_to_cpus __le16_to_cpus
115#define cpu_to_be64s __cpu_to_be64s
116#define be64_to_cpus __be64_to_cpus
117#define cpu_to_be32s __cpu_to_be32s
118#define be32_to_cpus __be32_to_cpus
119#define cpu_to_be16s __cpu_to_be16s
120#define be16_to_cpus __be16_to_cpus
121
122/*
123 * They have to be macros in order to do the constant folding
124 * correctly - if the argument passed into a inline function
125 * it is no longer constant according to gcc..
126 */
127
128#undef ntohl
129#undef ntohs
130#undef htonl
131#undef htons
132
133#define ___htonl(x) __cpu_to_be32(x)
134#define ___htons(x) __cpu_to_be16(x)
135#define ___ntohl(x) __be32_to_cpu(x)
136#define ___ntohs(x) __be16_to_cpu(x)
137
138#define htonl(x) ___htonl(x)
139#define ntohl(x) ___ntohl(x)
140#define htons(x) ___htons(x)
141#define ntohs(x) ___ntohs(x)
142
143static inline void le16_add_cpu(__le16 *var, u16 val)
144{
145	*var = cpu_to_le16(le16_to_cpu(*var) + val);
146}
147
148static inline void le32_add_cpu(__le32 *var, u32 val)
149{
150	*var = cpu_to_le32(le32_to_cpu(*var) + val);
151}
152
153static inline void le64_add_cpu(__le64 *var, u64 val)
154{
155	*var = cpu_to_le64(le64_to_cpu(*var) + val);
156}
157
158static inline void be16_add_cpu(__be16 *var, u16 val)
159{
160	*var = cpu_to_be16(be16_to_cpu(*var) + val);
161}
162
163static inline void be32_add_cpu(__be32 *var, u32 val)
164{
165	*var = cpu_to_be32(be32_to_cpu(*var) + val);
166}
167
168static inline void be64_add_cpu(__be64 *var, u64 val)
169{
170	*var = cpu_to_be64(be64_to_cpu(*var) + val);
171}
172
173#endif /* _LINUX_BYTEORDER_GENERIC_H */