usr/src/uts/intel/asm/byteorder.h

   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/ccompile.h>
  30 #include <sys/types.h>
  31
  32 #ifdef  __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 #if !defined(__lint) && defined(__GNUC__)
  37
  38 /*
  39  * htonll(), ntohll(), htonl(), ntohl(), htons(), ntohs()
  40  * These functions reverse the byte order of the input parameter and returns
  41  * the result.  This is to convert the byte order from host byte order
  42  * (little endian) to network byte order (big endian), or vice versa.
  43  */
  44
  45
  46 #if defined(__i386) || defined(__amd64)
  47
  48 extern __GNU_INLINE uint16_t
  49 htons(uint16_t value)
  50 {
  51 #if defined(__amd64)
  52         __asm__("xchgb %h0, %b0" : "+Q" (value));
  53 #elif defined(__i386)
  54         __asm__("xchgb %h0, %b0" : "+q" (value));
  55 #endif
  56         return (value);
  57 }
  58
  59 extern __GNU_INLINE uint16_t
  60 ntohs(uint16_t value)
  61 {
  62 #if defined(__amd64)
  63         __asm__("xchgb %h0, %b0" : "+Q" (value));
  64 #elif defined(__i386)
  65         __asm__("xchgb %h0, %b0" : "+q" (value));
  66 #endif
  67         return (value);
  68 }
  69
  70 extern __GNU_INLINE uint32_t
  71 htonl(uint32_t value)
  72 {
  73         __asm__("bswap %0" : "+r" (value));
  74         return (value);
  75 }
  76
  77 extern __GNU_INLINE uint32_t
  78 ntohl(uint32_t value)
  79 {
  80         __asm__("bswap %0" : "+r" (value));
  81         return (value);
  82 }
  83
  84 #if defined(__amd64)
  85 extern __GNU_INLINE uint64_t
  86 htonll(uint64_t value)
  87 {
  88         __asm__("bswapq %0" : "+r" (value));
  89         return (value);
  90 }
  91
  92 extern __GNU_INLINE uint64_t
  93 ntohll(uint64_t value)
  94 {
  95         __asm__("bswapq %0" : "+r" (value));
  96         return (value);
  97 }
  98
  99 #elif defined(__i386)
 100 /* Use the htonl() and ntohl() inline functions defined above */
 101 extern __GNU_INLINE uint64_t
 102 htonll(uint64_t value)
 103 {
 104         return (htonl(value >> 32) | ((uint64_t)htonl(value) << 32));
 105 }
 106
 107 extern __GNU_INLINE uint64_t
 108 ntohll(uint64_t value)
 109 {
 110         return (ntohl(value >> 32) | (uint64_t)ntohl(value) << 32);
 111 }
 112 #endif  /* __amd64 */
 113
 114 #endif  /* __i386 || __amd64 */
 115
 116 #endif  /* !__lint && __GNUC__ */
 117
 118 #ifdef  __cplusplus
 119 }
 120 #endif
 121
 122 #endif  /* _ASM_BYTEORDER_H */