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