| 1 | /* $NetBSD: bswap.h,v 1.19 2015/03/12 15:28:16 christos Exp $ */ |
| 2 | |
| 3 | /* Written by Manuel Bouyer. Public domain */ |
| 4 | |
| 5 | #ifndef _SYS_BSWAP_H_ |
| 6 | #define _SYS_BSWAP_H_ |
| 7 | |
| 8 | #ifndef _LOCORE |
| 9 | #include <sys/stdint.h> |
| 10 | |
| 11 | #include <machine/bswap.h> |
| 12 | |
| 13 | __BEGIN_DECLS |
| 14 | /* Always declare the functions in case their address is taken (etc) */ |
| 15 | #if defined(_KERNEL) || defined(_STANDALONE) || !defined(__BSWAP_RENAME) |
| 16 | uint16_t bswap16(uint16_t) __constfunc; |
| 17 | uint32_t bswap32(uint32_t) __constfunc; |
| 18 | #else |
| 19 | uint16_t bswap16(uint16_t) __RENAME(__bswap16) __constfunc; |
| 20 | uint32_t bswap32(uint32_t) __RENAME(__bswap32) __constfunc; |
| 21 | #endif |
| 22 | uint64_t bswap64(uint64_t) __constfunc; |
| 23 | __END_DECLS |
| 24 | |
| 25 | #if defined(__GNUC__) && !defined(__lint__) |
| 26 | |
| 27 | /* machine/byte_swap.h might have defined inline versions */ |
| 28 | #ifndef __BYTE_SWAP_U64_VARIABLE |
| 29 | #define __BYTE_SWAP_U64_VARIABLE bswap64 |
| 30 | #endif |
| 31 | |
| 32 | #ifndef __BYTE_SWAP_U32_VARIABLE |
| 33 | #define __BYTE_SWAP_U32_VARIABLE bswap32 |
| 34 | #endif |
| 35 | |
| 36 | #ifndef __BYTE_SWAP_U16_VARIABLE |
| 37 | #define __BYTE_SWAP_U16_VARIABLE bswap16 |
| 38 | #endif |
| 39 | |
| 40 | #define __byte_swap_u64_constant(x) \ |
| 41 | (__CAST(uint64_t, \ |
| 42 | ((((x) & 0xff00000000000000ull) >> 56) | \ |
| 43 | (((x) & 0x00ff000000000000ull) >> 40) | \ |
| 44 | (((x) & 0x0000ff0000000000ull) >> 24) | \ |
| 45 | (((x) & 0x000000ff00000000ull) >> 8) | \ |
| 46 | (((x) & 0x00000000ff000000ull) << 8) | \ |
| 47 | (((x) & 0x0000000000ff0000ull) << 24) | \ |
| 48 | (((x) & 0x000000000000ff00ull) << 40) | \ |
| 49 | (((x) & 0x00000000000000ffull) << 56)))) |
| 50 | |
| 51 | #define __byte_swap_u32_constant(x) \ |
| 52 | (__CAST(uint32_t, \ |
| 53 | ((((x) & 0xff000000) >> 24) | \ |
| 54 | (((x) & 0x00ff0000) >> 8) | \ |
| 55 | (((x) & 0x0000ff00) << 8) | \ |
| 56 | (((x) & 0x000000ff) << 24)))) |
| 57 | |
| 58 | #define __byte_swap_u16_constant(x) \ |
| 59 | (__CAST(uint16_t, \ |
| 60 | ((((x) & 0xff00) >> 8) | \ |
| 61 | (((x) & 0x00ff) << 8)))) |
| 62 | |
| 63 | #define bswap64(x) \ |
| 64 | __CAST(uint64_t, __builtin_constant_p((x)) ? \ |
| 65 | __byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x)) |
| 66 | |
| 67 | #define bswap32(x) \ |
| 68 | __CAST(uint32_t, __builtin_constant_p((x)) ? \ |
| 69 | __byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x)) |
| 70 | |
| 71 | #define bswap16(x) \ |
| 72 | __CAST(uint16_t, __builtin_constant_p((x)) ? \ |
| 73 | __byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x)) |
| 74 | |
| 75 | #endif /* __GNUC__ && !__lint__ */ |
| 76 | #endif /* !_LOCORE */ |
| 77 | |
| 78 | #endif /* !_SYS_BSWAP_H_ */ |
| 79 | |