| 1 | /* $NetBSD: bswap.h,v 1.12 2006/05/22 16:28:27 drochner Exp $ */
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| 2 |
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| 3 | /* Written by Manuel Bouyer. Public domain */
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| 4 |
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| 5 | #ifndef _SYS_BSWAP_H_
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| 6 | #define _SYS_BSWAP_H_
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| 7 |
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| 8 | #ifndef _LOCORE
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| 9 | #include <sys/EfiCdefs.h>
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| 10 | #include <sys/types.h>
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| 11 |
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| 12 | #include <machine/bswap.h>
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| 13 |
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| 14 | __BEGIN_DECLS
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| 15 | /* Always declare the functions in case their address is taken (etc) */
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| 16 | #if !defined(__BSWAP_RENAME)
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| 17 | uint16_t bswap16(uint16_t) __attribute__((__const__));
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| 18 | uint32_t bswap32(uint32_t) __attribute__((__const__));
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| 19 | #else
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| 20 | uint16_t bswap16(uint16_t) __RENAME(__bswap16) __attribute__((__const__));
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| 21 | uint32_t bswap32(uint32_t) __RENAME(__bswap32) __attribute__((__const__));
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| 22 | #endif
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| 23 | uint64_t bswap64(uint64_t) __attribute__((__const__));
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| 24 | __END_DECLS
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| 25 |
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| 26 | #if defined(__GNUC__) && defined(__OPTIMIZE__)
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| 27 |
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| 28 | /* machine/byte_swap.h might have defined inline versions */
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| 29 | #ifndef __BYTE_SWAP_U64_VARIABLE
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| 30 | #define __BYTE_SWAP_U64_VARIABLE bswap64
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| 31 | #endif
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| 32 |
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| 33 | #ifndef __BYTE_SWAP_U32_VARIABLE
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| 34 | #define __BYTE_SWAP_U32_VARIABLE bswap32
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| 35 | #endif
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| 36 |
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| 37 | #ifndef __BYTE_SWAP_U16_VARIABLE
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| 38 | #define __BYTE_SWAP_U16_VARIABLE bswap16
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| 39 | #endif
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| 40 |
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| 41 | #define __byte_swap_u64_constant(x) \
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| 42 | ((uint64_t) \
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| 43 | ((((x) & 0xff00000000000000ull) >> 56) | \
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| 44 | (((x) & 0x00ff000000000000ull) >> 40) | \
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| 45 | (((x) & 0x0000ff0000000000ull) >> 24) | \
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| 46 | (((x) & 0x000000ff00000000ull) >> 8) | \
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| 47 | (((x) & 0x00000000ff000000ull) << 8) | \
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| 48 | (((x) & 0x0000000000ff0000ull) << 24) | \
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| 49 | (((x) & 0x000000000000ff00ull) << 40) | \
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| 50 | (((x) & 0x00000000000000ffull) << 56)))
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| 51 |
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| 52 | #define __byte_swap_u32_constant(x) \
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| 53 | ((((x) & 0xff000000) >> 24) | \
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| 54 | (((x) & 0x00ff0000) >> 8) | \
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| 55 | (((x) & 0x0000ff00) << 8) | \
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| 56 | (((x) & 0x000000ff) << 24))
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| 57 |
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| 58 | #define __byte_swap_u16_constant(x) \
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| 59 | ((((x) & 0xff00) >> 8) | \
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| 60 | (((x) & 0x00ff) << 8))
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| 61 |
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| 62 | #define bswap64(x) \
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| 63 | (__builtin_constant_p((x)) ? \
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| 64 | __byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x))
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| 65 |
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| 66 | #define bswap32(x) \
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| 67 | (__builtin_constant_p((x)) ? \
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| 68 | __byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x))
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| 69 |
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| 70 | #define bswap16(x) \
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| 71 | (__builtin_constant_p((x)) ? \
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| 72 | __byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
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| 73 |
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| 74 | #endif /* __GNUC__ && __OPTIMIZE__ */
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| 75 | #endif /* !_LOCORE */
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| 76 |
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| 77 | #endif /* !_SYS_BSWAP_H_ */
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