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Annotation of XNU/osfmk/i386/endian.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:  * @OSF_COPYRIGHT@
                     24:  * 
                     25:  */
                     26: 
                     27: #ifndef _MACHINE_ENDIAN_H_
                     28: #define _MACHINE_ENDIAN_H_
                     29: 
                     30: /*
                     31:  * Definitions for byte order,
                     32:  * according to byte significance from low address to high.
                     33:  */
                     34: #define        LITTLE_ENDIAN   1234    /* least-significant byte first (vax) */
                     35: #define        BIG_ENDIAN      4321    /* most-significant byte first (IBM, net) */
                     36: #define        PDP_ENDIAN      3412    /* LSB first in word, MSW first in long (pdp) */
                     37: 
                     38: #define        BYTE_ORDER      LITTLE_ENDIAN   /* byte order on i386 */
                     39: #define ENDIAN         LITTLE
                     40: 
                     41: /*
                     42:  * Macros for network/external number representation conversion.
                     43:  */
                     44: 
                     45: unsigned short ntohs(unsigned short), htons(unsigned short);
                     46: unsigned long  ntohl(unsigned long), htonl(unsigned long);
                     47: 
                     48: /*
                     49:  * Use GNUC support to inline the byteswappers.
                     50:  */
                     51: 
                     52: extern __inline__
                     53: unsigned short
                     54: ntohs(unsigned short w_int)
                     55: {
                     56:        register unsigned short w = w_int;
                     57:        __asm__ volatile("xchgb %h1,%b1" : "=q" (w) : "0" (w));
                     58:        return (w);     /* zero-extend for compat */
                     59: }
                     60: 
                     61: #define        htons   ntohs
                     62: 
                     63: extern __inline__
                     64: unsigned long
                     65: ntohl(register unsigned long value)
                     66: {
                     67:        register unsigned long l = value;
                     68:        __asm__ volatile("bswap %0" : "=r" (l) : "0" (l));
                     69:        return l;
                     70: }
                     71: 
                     72: #define htonl  ntohl
                     73: 
                     74: #define NTOHL(x)       (x) = ntohl((unsigned long)x)
                     75: #define NTOHS(x)       (x) = ntohs((unsigned short)x)
                     76: #define HTONL(x)       (x) = htonl((unsigned long)x)
                     77: #define HTONS(x)       (x) = htons((unsigned short)x)
                     78: 
                     79: #endif

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