/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ * */ #ifndef _MACHINE_ENDIAN_H_ #define _MACHINE_ENDIAN_H_ /* * Definitions for byte order, * according to byte significance from low address to high. */ #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ #ifdef __BIG_ENDIAN__ /* Predefined by compiler */ #define BYTE_ORDER BIG_ENDIAN /* byte order we use on ppc */ #define ENDIAN BIG #else #error code has not been ported to little endian targets yet #endif /* * Macros for network/external number representation conversion. */ #if BYTE_ORDER == BIG_ENDIAN && !defined(lint) #define ntohl(x) (x) #define ntohs(x) (x) #define htonl(x) (x) #define htons(x) (x) static __inline__ unsigned int byte_reverse_word(unsigned int word); static __inline__ unsigned int byte_reverse_word(unsigned int word) { unsigned int result; __asm__ volatile("lwbrx %0, 0, %1" : "=r" (result) : "r" (&word)); return result; } /* The above function is commutative, so we can use it for * translations in both directions (to/from little endianness) * Note that htolx and ltohx are probably identical, they are * included for completeness. */ #define htoll(x) byte_reverse_word(x) #define htols(x) (byte_reverse_word(x) >> 16) #define ltohl(x) htoll(x) #define ltohs(x) htols(x) #define htobl(x) (x) #define htobs(x) (x) #define btohl(x) (x) #define btohs(x) (x) #else unsigned short ntohs(), htons(); unsigned long ntohl(), htonl(); #endif /* This defines the order of elements in a bitfield, * it is principally used by the SCSI subsystem in * the definitions of mapped registers */ #define BYTE_MSF 1 #endif /* _MACHINE_ENDIAN_H_ */