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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 424 | giacomo | 1 | #ifndef _LINUX_BYTEORDER_SWABB_H |
| 2 | #define _LINUX_BYTEORDER_SWABB_H |
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| 3 | |||
| 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 | |||
| 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 | |||
| 28 | #define ___swahw32(x) \ |
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| 29 | ({ \ |
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| 30 | __u32 __x = (x); \ |
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| 31 | ((__u32)( \ |
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| 32 | (((__u32)(__x) & (__u32)0x0000ffffUL) << 16) | \ |
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| 33 | (((__u32)(__x) & (__u32)0xffff0000UL) >> 16) )); \ |
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| 34 | }) |
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| 35 | #define ___swahb32(x) \ |
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| 36 | ({ \ |
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| 37 | __u32 __x = (x); \ |
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| 38 | ((__u32)( \ |
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| 39 | (((__u32)(__x) & (__u32)0x00ff00ffUL) << 8) | \ |
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| 40 | (((__u32)(__x) & (__u32)0xff00ff00UL) >> 8) )); \ |
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| 41 | }) |
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| 42 | |||
| 43 | #define ___constant_swahw32(x) \ |
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| 44 | ((__u32)( \ |
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| 45 | (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ |
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| 46 | (((__u32)(x) & (__u32)0xffff0000UL) >> 16) )) |
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| 47 | #define ___constant_swahb32(x) \ |
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| 48 | ((__u32)( \ |
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| 49 | (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \ |
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| 50 | (((__u32)(x) & (__u32)0xff00ff00UL) >> 8) )) |
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| 51 | |||
| 52 | /* |
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| 53 | * provide defaults when no architecture-specific optimization is detected |
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| 54 | */ |
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| 55 | #ifndef __arch__swahw32 |
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| 56 | # define __arch__swahw32(x) ___swahw32(x) |
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| 57 | #endif |
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| 58 | #ifndef __arch__swahb32 |
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| 59 | # define __arch__swahb32(x) ___swahb32(x) |
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| 60 | #endif |
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| 61 | |||
| 62 | #ifndef __arch__swahw32p |
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| 63 | # define __arch__swahw32p(x) __swahw32(*(x)) |
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| 64 | #endif |
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| 65 | #ifndef __arch__swahb32p |
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| 66 | # define __arch__swahb32p(x) __swahb32(*(x)) |
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| 67 | #endif |
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| 68 | |||
| 69 | #ifndef __arch__swahw32s |
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| 70 | # define __arch__swahw32s(x) do { *(x) = __swahw32p((x)); } while (0) |
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| 71 | #endif |
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| 72 | #ifndef __arch__swahb32s |
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| 73 | # define __arch__swahb32s(x) do { *(x) = __swahb32p((x)); } while (0) |
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| 74 | #endif |
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| 75 | |||
| 76 | |||
| 77 | /* |
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| 78 | * Allow constant folding |
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| 79 | */ |
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| 80 | #if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__) |
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| 81 | # define __swahw32(x) \ |
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| 82 | (__builtin_constant_p((__u32)(x)) ? \ |
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| 83 | ___swahw32((x)) : \ |
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| 84 | __fswahw32((x))) |
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| 85 | # define __swahb32(x) \ |
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| 86 | (__builtin_constant_p((__u32)(x)) ? \ |
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| 87 | ___swahb32((x)) : \ |
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| 88 | __fswahb32((x))) |
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| 89 | #else |
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| 90 | # define __swahw32(x) __fswahw32(x) |
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| 91 | # define __swahb32(x) __fswahb32(x) |
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| 92 | #endif /* OPTIMIZE */ |
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| 93 | |||
| 94 | |||
| 95 | static __inline__ __const__ __u32 __fswahw32(__u32 x) |
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| 96 | { |
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| 97 | return __arch__swahw32(x); |
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| 98 | } |
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| 99 | static __inline__ __u32 __swahw32p(__u32 *x) |
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| 100 | { |
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| 101 | return __arch__swahw32p(x); |
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| 102 | } |
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| 103 | static __inline__ void __swahw32s(__u32 *addr) |
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| 104 | { |
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| 105 | __arch__swahw32s(addr); |
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| 106 | } |
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| 107 | |||
| 108 | |||
| 109 | static __inline__ __const__ __u32 __fswahb32(__u32 x) |
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| 110 | { |
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| 111 | return __arch__swahb32(x); |
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| 112 | } |
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| 113 | static __inline__ __u32 __swahb32p(__u32 *x) |
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| 114 | { |
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| 115 | return __arch__swahb32p(x); |
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| 116 | } |
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| 117 | static __inline__ void __swahb32s(__u32 *addr) |
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| 118 | { |
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| 119 | __arch__swahb32s(addr); |
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| 120 | } |
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| 121 | |||
| 122 | #ifdef __BYTEORDER_HAS_U64__ |
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| 123 | /* |
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| 124 | * Not supported yet |
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| 125 | */ |
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| 126 | #endif /* __BYTEORDER_HAS_U64__ */ |
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| 127 | |||
| 128 | #if defined(__KERNEL__) |
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| 129 | #define swahw32 __swahw32 |
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| 130 | #define swahb32 __swahb32 |
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| 131 | #define swahw32p __swahw32p |
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| 132 | #define swahb32p __swahb32p |
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| 133 | #define swahw32s __swahw32s |
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| 134 | #define swahb32s __swahb32s |
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| 135 | #endif |
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| 136 | |||
| 137 | #endif /* _LINUX_BYTEORDER_SWABB_H */ |