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Annotation of Gnu-Mach/linux/src/include/asm-i386/byteorder.h, revision 1.1

1.1     ! root        1: #ifndef _I386_BYTEORDER_H
        !             2: #define _I386_BYTEORDER_H
        !             3: 
        !             4: #undef ntohl
        !             5: #undef ntohs
        !             6: #undef htonl
        !             7: #undef htons
        !             8: 
        !             9: #ifndef __LITTLE_ENDIAN
        !            10: #define __LITTLE_ENDIAN 1234
        !            11: #endif
        !            12: 
        !            13: #ifndef __LITTLE_ENDIAN_BITFIELD
        !            14: #define __LITTLE_ENDIAN_BITFIELD
        !            15: #endif
        !            16: 
        !            17: /* For avoiding bswap on i386 */
        !            18: #ifdef __KERNEL__
        !            19: #include <linux/config.h>
        !            20: #endif
        !            21: 
        !            22: extern unsigned long int       ntohl(unsigned long int);
        !            23: extern unsigned short int      ntohs(unsigned short int);
        !            24: extern unsigned long int       htonl(unsigned long int);
        !            25: extern unsigned short int      htons(unsigned short int);
        !            26: 
        !            27: extern __inline__ unsigned long int    __ntohl(unsigned long int);
        !            28: extern __inline__ unsigned short int   __ntohs(unsigned short int);
        !            29: extern __inline__ unsigned long int    __constant_ntohl(unsigned long int);
        !            30: extern __inline__ unsigned short int   __constant_ntohs(unsigned short int);
        !            31: 
        !            32: extern __inline__ unsigned long int
        !            33: __ntohl(unsigned long int x)
        !            34: {
        !            35: #if defined(__KERNEL__) && !defined(CONFIG_M386)
        !            36:        __asm__("bswap %0" : "=r" (x) : "0" (x));
        !            37: #else
        !            38:        __asm__("xchgb %b0,%h0\n\t"     /* swap lower bytes     */
        !            39:                "rorl $16,%0\n\t"       /* swap words           */
        !            40:                "xchgb %b0,%h0"         /* swap higher bytes    */
        !            41:                :"=q" (x)
        !            42:                : "0" (x));
        !            43: #endif 
        !            44:        return x;
        !            45: }
        !            46: 
        !            47: #define __constant_ntohl(x) \
        !            48:        ((unsigned long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
        !            49:                             (((unsigned long int)(x) & 0x0000ff00U) <<  8) | \
        !            50:                             (((unsigned long int)(x) & 0x00ff0000U) >>  8) | \
        !            51:                             (((unsigned long int)(x) & 0xff000000U) >> 24)))
        !            52: 
        !            53: extern __inline__ unsigned short int
        !            54: __ntohs(unsigned short int x)
        !            55: {
        !            56:        __asm__("xchgb %b0,%h0"         /* swap bytes           */
        !            57:                : "=q" (x)
        !            58:                :  "0" (x));
        !            59:        return x;
        !            60: }
        !            61: 
        !            62: #define __constant_ntohs(x) \
        !            63:        ((unsigned short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
        !            64:                              (((unsigned short int)(x) & 0xff00) >> 8))) \
        !            65: 
        !            66: #define __htonl(x) __ntohl(x)
        !            67: #define __htons(x) __ntohs(x)
        !            68: #define __constant_htonl(x) __constant_ntohl(x)
        !            69: #define __constant_htons(x) __constant_ntohs(x)
        !            70: 
        !            71: #ifdef  __OPTIMIZE__
        !            72: #  define ntohl(x) \
        !            73: (__builtin_constant_p((long)(x)) ? \
        !            74:  __constant_ntohl((x)) : \
        !            75:  __ntohl((x)))
        !            76: #  define ntohs(x) \
        !            77: (__builtin_constant_p((short)(x)) ? \
        !            78:  __constant_ntohs((x)) : \
        !            79:  __ntohs((x)))
        !            80: #  define htonl(x) \
        !            81: (__builtin_constant_p((long)(x)) ? \
        !            82:  __constant_htonl((x)) : \
        !            83:  __htonl((x)))
        !            84: #  define htons(x) \
        !            85: (__builtin_constant_p((short)(x)) ? \
        !            86:  __constant_htons((x)) : \
        !            87:  __htons((x)))
        !            88: #endif
        !            89: 
        !            90: #endif

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