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
  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 __GNU_INLINE uint16_t
  48 htons(uint16_t value)
  49 {
  50 #if defined(__amd64)
  51         __asm__("xchgb %h0, %b0" : "+Q" (value));
  52 #elif defined(__i386)
  53         __asm__("xchgb %h0, %b0" : "+q" (value));
  54 #endif
  55         return (value);
  56 }
  57
  58 extern __GNU_INLINE uint16_t
  59 ntohs(uint16_t value)
  60 {
  61 #if defined(__amd64)
  62         __asm__("xchgb %h0, %b0" : "+Q" (value));
  63 #elif defined(__i386)
  64         __asm__("xchgb %h0, %b0" : "+q" (value));
  65 #endif
  66         return (value);
  67 }
  68
  69 extern __GNU_INLINE uint32_t
  70 htonl(uint32_t value)
  71 {
  72         __asm__("bswap %0" : "+r" (value));
  73         return (value);
  74 }
  75
  76 extern __GNU_INLINE uint32_t
  77 ntohl(uint32_t value)
  78 {
  79         __asm__("bswap %0" : "+r" (value));
  80         return (value);
  81 }
  82
  83 #if defined(__amd64)
  84 extern __GNU_INLINE uint64_t
  85 htonll(uint64_t value)
  86 {
  87         __asm__("bswapq %0" : "+r" (value));
  88         return (value);
  89 }
  90
  91 extern __GNU_INLINE uint64_t
  92 ntohll(uint64_t value)
  93 {
  94         __asm__("bswapq %0" : "+r" (value));
  95         return (value);
  96 }
  97
  98 #elif defined(__i386)
  99 /* Use the htonl() and ntohl() inline functions defined above */
 100 extern __GNU_INLINE uint64_t
 101 htonll(uint64_t value)
 102 {
 103         return (htonl(value >> 32) | ((uint64_t)htonl(value) << 32));
 104 }
 105
 106 extern __GNU_INLINE uint64_t
 107 ntohll(uint64_t value)
 108 {
 109         return (ntohl(value >> 32) | (uint64_t)ntohl(value) << 32);
 110 }
 111 #endif  /* __amd64 */
 112
 113 #endif  /* __i386 || __amd64 */
 114
 115
 116 #ifdef  __cplusplus
 117 }
 118 #endif
 119
 120 #endif  /* _ASM_BYTEORDER_H */