1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 
  26 #ifndef _ASM_BYTEORDER_H
  27 #define _ASM_BYTEORDER_H
  28 
  29 #include <sys/types.h>
  30 
  31 #ifdef  __cplusplus
  32 extern "C" {
  33 #endif
  34 
  35 #if !defined(__lint) && defined(__GNUC__)
  36 
  37 /*
  38  * htonll(), ntohll(), htonl(), ntohl(), htons(), ntohs()
  39  * These functions reverse the byte order of the input parameter and returns
  40  * the result.  This is to convert the byte order from host byte order
  41  * (little endian) to network byte order (big endian), or vice versa.
  42  */
  43 
  44 
  45 #if defined(__i386) || defined(__amd64)
  46 
  47 extern __inline__ uint16_t htons(uint16_t value)
  48 {
  49 #if defined(__amd64)
  50         __asm__("xchgb %h0, %b0" : "+Q" (value));
  51 #elif defined(__i386)
  52         __asm__("xchgb %h0, %b0" : "+q" (value));
  53 #endif
  54         return (value);
  55 }
  56 
  57 extern __inline__ uint16_t ntohs(uint16_t value)
  58 {
  59 #if defined(__amd64)
  60         __asm__("xchgb %h0, %b0" : "+Q" (value));
  61 #elif defined(__i386)
  62         __asm__("xchgb %h0, %b0" : "+q" (value));
  63 #endif
  64         return (value);
  65 }
  66 
  67 extern __inline__ uint32_t htonl(uint32_t value)
  68 {
  69         __asm__("bswap %0" : "+r" (value));
  70         return (value);
  71 }
  72 
  73 extern __inline__ uint32_t ntohl(uint32_t value)
  74 {
  75         __asm__("bswap %0" : "+r" (value));
  76         return (value);
  77 }
  78 
  79 #if defined(__amd64)
  80 extern __inline__ uint64_t htonll(uint64_t value)
  81 {
  82         __asm__("bswapq %0" : "+r" (value));
  83         return (value);
  84 }
  85 
  86 extern __inline__ uint64_t ntohll(uint64_t value)
  87 {
  88         __asm__("bswapq %0" : "+r" (value));
  89         return (value);
  90 }
  91 
  92 #elif defined(__i386)
  93 /* Use the htonl() and ntohl() inline functions defined above */
  94 extern __inline__ uint64_t htonll(uint64_t value)
  95 {
  96         return (htonl(value >> 32) | ((uint64_t)htonl(value) << 32));
  97 }
  98 
  99 extern __inline__ uint64_t ntohll(uint64_t value)
 100 {
 101         return (ntohl(value >> 32) | (uint64_t)ntohl(value) << 32);
 102 }
 103 #endif  /* __amd64 */
 104 
 105 #endif  /* __i386 || __amd64 */
 106 
 107 #endif  /* !__lint && __GNUC__ */
 108 
 109 #ifdef  __cplusplus
 110 }
 111 #endif
 112 
 113 #endif  /* _ASM_BYTEORDER_H */