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 */ 114