1 /*      $NetBSD: bswap.h,v 1.12 2006/05/22 16:28:27 drochner 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/EfiCdefs.h>
10 #include  <sys/types.h>
11 
12 #include  <machine/bswap.h>
13 
14 __BEGIN_DECLS
15 /* Always declare the functions in case their address is taken (etc) */
16 #if !defined(__BSWAP_RENAME)
17 uint16_t bswap16(uint16_t) __attribute__((__const__));
18 uint32_t bswap32(uint32_t) __attribute__((__const__));
19 #else
20 uint16_t bswap16(uint16_t) __RENAME(__bswap16) __attribute__((__const__));
21 uint32_t bswap32(uint32_t) __RENAME(__bswap32) __attribute__((__const__));
22 #endif
23 uint64_t bswap64(uint64_t) __attribute__((__const__));
24 __END_DECLS
25 
26 #if defined(__GNUC__) && defined(__OPTIMIZE__)
27 
28 /* machine/byte_swap.h might have defined inline versions */
29 #ifndef __BYTE_SWAP_U64_VARIABLE
30 #define __BYTE_SWAP_U64_VARIABLE bswap64
31 #endif
32 
33 #ifndef __BYTE_SWAP_U32_VARIABLE
34 #define __BYTE_SWAP_U32_VARIABLE bswap32
35 #endif
36 
37 #ifndef __BYTE_SWAP_U16_VARIABLE
38 #define __BYTE_SWAP_U16_VARIABLE bswap16
39 #endif
40 
41 #define __byte_swap_u64_constant(x) \
42   ((uint64_t) \
43    ((((x) & 0xff00000000000000ull) >> 56) | \
44     (((x) & 0x00ff000000000000ull) >> 40) | \
45     (((x) & 0x0000ff0000000000ull) >> 24) | \
46     (((x) & 0x000000ff00000000ull) >>  8) | \
47     (((x) & 0x00000000ff000000ull) <<  8) | \
48     (((x) & 0x0000000000ff0000ull) << 24) | \
49     (((x) & 0x000000000000ff00ull) << 40) | \
50     (((x) & 0x00000000000000ffull) << 56)))
51 
52 #define __byte_swap_u32_constant(x) \
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   ((((x) & 0xff00) >> 8) | \
60    (((x) & 0x00ff) << 8))
61 
62 #define bswap64(x) \
63   (__builtin_constant_p((x)) ? \
64    __byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x))
65 
66 #define bswap32(x) \
67   (__builtin_constant_p((x)) ? \
68    __byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x))
69 
70 #define bswap16(x) \
71   (__builtin_constant_p((x)) ? \
72    __byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
73 
74 #endif /* __GNUC__ && __OPTIMIZE__ */
75 #endif /* !_LOCORE */
76 
77 #endif /* !_SYS_BSWAP_H_ */
78