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 | |