| 1 | #ifndef _LINUX_BYTEORDER_SWABB_H
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| 2 | #define _LINUX_BYTEORDER_SWABB_H
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| 3 |
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| 4 | /*
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| 5 | * linux/byteorder/swabb.h
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| 6 | * SWAp Bytes Bizarrely
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| 7 | * swaHHXX[ps]?(foo)
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| 8 | *
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| 9 | * Support for obNUXIous pdp-endian and other bizarre architectures.
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| 10 | * Will Linux ever run on such ancient beasts? if not, this file
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| 11 | * will be but a programming pearl. Still, it's a reminder that we
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| 12 | * shouldn't be making too many assumptions when trying to be portable.
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| 13 | *
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| 14 | */
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| 15 |
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| 16 | /*
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| 17 | * Meaning of the names I chose (vaxlinux people feel free to correct them):
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| 18 | * swahw32 swap 16-bit half-words in a 32-bit word
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| 19 | * swahb32 swap 8-bit halves of each 16-bit half-word in a 32-bit word
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| 20 | *
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| 21 | * No 64-bit support yet. I don't know NUXI conventions for long longs.
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| 22 | * I guarantee it will be a mess when it's there, though :->
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| 23 | * It will be even worse if there are conflicting 64-bit conventions.
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| 24 | * Hopefully, no one ever used 64-bit objects on NUXI machines.
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| 25 | *
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| 26 | */
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| 27 |
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| 28 |
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| 29 | #define ___swahw32(x) \
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| 30 | ((__u32)( \
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| 31 | (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \
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| 32 | (((__u32)(x) & (__u32)0xffff0000UL) >> 16) ))
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| 33 | #define ___swahb32(x) \
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| 34 | ((__u32)( \
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| 35 | (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \
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| 36 | (((__u32)(x) & (__u32)0xff00ff00UL) >> 8) ))
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| 37 |
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| 38 | /*
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| 39 | * provide defaults when no architecture-specific optimization is detected
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| 40 | */
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| 41 | #ifndef __arch__swahw32
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| 42 | # define __arch__swahw32(x) ___swahw32(x)
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| 43 | #endif
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| 44 | #ifndef __arch__swahb32
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| 45 | # define __arch__swahb32(x) ___swahb32(x)
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| 46 | #endif
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| 47 |
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| 48 | #ifndef __arch__swahw32p
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| 49 | # define __arch__swahw32p(x) __swahw32(*(x))
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| 50 | #endif
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| 51 | #ifndef __arch__swahb32p
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| 52 | # define __arch__swahb32p(x) __swahb32(*(x))
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| 53 | #endif
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| 54 |
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| 55 | #ifndef __arch__swahw32s
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| 56 | # define __arch__swahw32s(x) do { *(x) = __swahw32p((x)); } while (0)
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| 57 | #endif
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| 58 | #ifndef __arch__swahb32s
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| 59 | # define __arch__swahb32s(x) do { *(x) = __swahb32p((x)); } while (0)
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| 60 | #endif
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| 61 |
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| 62 |
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| 63 | /*
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| 64 | * Allow constant folding
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| 65 | */
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| 66 | #if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
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| 67 | # define __swahw32(x) \
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| 68 | (__builtin_constant_p((__u32)(x)) ? \
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| 69 | ___swahw32((x)) : \
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| 70 | __fswahw32((x)))
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| 71 | # define __swahb32(x) \
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| 72 | (__builtin_constant_p((__u32)(x)) ? \
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| 73 | ___swahb32((x)) : \
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| 74 | __fswahb32((x)))
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| 75 | #else
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| 76 | # define __swahw32(x) __fswahw32(x)
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| 77 | # define __swahb32(x) __fswahb32(x)
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| 78 | #endif /* OPTIMIZE */
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| 79 |
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| 80 |
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| 81 | extern __inline__ __const__ __u32 __fswahw32(__u32 x)
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| 82 | {
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| 83 | return __arch__swahw32(x);
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| 84 | }
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| 85 | extern __inline__ __u32 __swahw32p(__u32 *x)
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| 86 | {
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| 87 | return __arch__swahw32p(x);
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| 88 | }
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| 89 | extern __inline__ void __swahw32s(__u32 *addr)
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| 90 | {
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| 91 | __arch__swahw32s(addr);
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| 92 | }
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| 93 |
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| 94 |
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| 95 | extern __inline__ __const__ __u32 __fswahb32(__u32 x)
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| 96 | {
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| 97 | return __arch__swahb32(x);
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| 98 | }
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| 99 | extern __inline__ __u32 __swahb32p(__u32 *x)
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| 100 | {
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| 101 | return __arch__swahb32p(x);
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| 102 | }
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| 103 | extern __inline__ void __swahb32s(__u32 *addr)
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| 104 | {
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| 105 | __arch__swahb32s(addr);
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| 106 | }
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| 107 |
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| 108 | #ifdef __BYTEORDER_HAS_U64__
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| 109 | /*
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| 110 | * Not supported yet
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| 111 | */
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| 112 | #endif /* __BYTEORDER_HAS_U64__ */
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| 113 |
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| 114 | #if defined(__KERNEL__)
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| 115 | #define swahw32 __swahw32
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| 116 | #define swahb32 __swahb32
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| 117 | #define swahw32p __swahw32p
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| 118 | #define swahb32p __swahb32p
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| 119 | #define swahw32s __swahw32s
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| 120 | #define swahb32s __swahb32s
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| 121 | #endif
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| 122 |
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| 123 | #endif /* _LINUX_BYTEORDER_SWABB_H */
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