79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/* $NetBSD: bswap.h,v 1.16 2009/08/08 21:23:15 christos Exp $ */
|
|
|
|
/* Written by Manuel Bouyer. Public domain */
|
|
|
|
#ifndef _SYS_BSWAP_H_
|
|
#define _SYS_BSWAP_H_
|
|
|
|
#ifndef _LOCORE
|
|
#include <sys/cdefs.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <machine/bswap.h>
|
|
|
|
__BEGIN_DECLS
|
|
/* Always declare the functions in case their address is taken (etc) */
|
|
#if defined(_KERNEL) || defined(_STANDALONE) || !defined(__BSWAP_RENAME)
|
|
uint16_t bswap16(uint16_t) __constfunc;
|
|
uint32_t bswap32(uint32_t) __constfunc;
|
|
#else
|
|
uint16_t bswap16(uint16_t) __RENAME(__bswap16) __constfunc;
|
|
uint32_t bswap32(uint32_t) __RENAME(__bswap32) __constfunc;
|
|
#endif
|
|
uint64_t bswap64(uint64_t) __constfunc;
|
|
__END_DECLS
|
|
|
|
#if defined(__GNUC__) && defined(__OPTIMIZE__) && !defined(__lint__)
|
|
|
|
/* machine/byte_swap.h might have defined inline versions */
|
|
#ifndef __BYTE_SWAP_U64_VARIABLE
|
|
#define __BYTE_SWAP_U64_VARIABLE bswap64
|
|
#endif
|
|
|
|
#ifndef __BYTE_SWAP_U32_VARIABLE
|
|
#define __BYTE_SWAP_U32_VARIABLE bswap32
|
|
#endif
|
|
|
|
#ifndef __BYTE_SWAP_U16_VARIABLE
|
|
#define __BYTE_SWAP_U16_VARIABLE bswap16
|
|
#endif
|
|
|
|
#define __byte_swap_u64_constant(x) \
|
|
(__CAST(uint64_t, \
|
|
((((x) & 0xff00000000000000ull) >> 56) | \
|
|
(((x) & 0x00ff000000000000ull) >> 40) | \
|
|
(((x) & 0x0000ff0000000000ull) >> 24) | \
|
|
(((x) & 0x000000ff00000000ull) >> 8) | \
|
|
(((x) & 0x00000000ff000000ull) << 8) | \
|
|
(((x) & 0x0000000000ff0000ull) << 24) | \
|
|
(((x) & 0x000000000000ff00ull) << 40) | \
|
|
(((x) & 0x00000000000000ffull) << 56))))
|
|
|
|
#define __byte_swap_u32_constant(x) \
|
|
(__CAST(uint32_t, \
|
|
((((x) & 0xff000000) >> 24) | \
|
|
(((x) & 0x00ff0000) >> 8) | \
|
|
(((x) & 0x0000ff00) << 8) | \
|
|
(((x) & 0x000000ff) << 24))))
|
|
|
|
#define __byte_swap_u16_constant(x) \
|
|
(__CAST(uint16_t, \
|
|
((((x) & 0xff00) >> 8) | \
|
|
(((x) & 0x00ff) << 8))))
|
|
|
|
#define bswap64(x) \
|
|
(__builtin_constant_p((x)) ? \
|
|
__byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x))
|
|
|
|
#define bswap32(x) \
|
|
(__builtin_constant_p((x)) ? \
|
|
__byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x))
|
|
|
|
#define bswap16(x) \
|
|
(__builtin_constant_p((x)) ? \
|
|
__byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
|
|
|
|
#endif /* __GNUC__ && __OPTIMIZE__ */
|
|
#endif /* !_LOCORE */
|
|
|
|
#endif /* !_SYS_BSWAP_H_ */
|