/* * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This 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 OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ #ifndef _OS_OSBYTEORDER_H #define _OS_OSBYTEORDER_H #include /* Macros for swapping constant values in the preprocessing stage. */ #define OSSwapConstInt16(x) \ ((uint16_t)((((uint16_t)(x) & 0xff00) >> 8) | \ (((uint16_t)(x) & 0x00ff) << 8))) #define OSSwapConstInt32(x) \ ((uint32_t)((((uint32_t)(x) & 0xff000000) >> 24) | \ (((uint32_t)(x) & 0x00ff0000) >> 8) | \ (((uint32_t)(x) & 0x0000ff00) << 8) | \ (((uint32_t)(x) & 0x000000ff) << 24))) #define OSSwapConstInt64(x) \ ((uint64_t)((((uint64_t)(x) & 0xff00000000000000ULL) >> 56) | \ (((uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \ (((uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \ (((uint64_t)(x) & 0x000000ff00000000ULL) >> 8) | \ (((uint64_t)(x) & 0x00000000ff000000ULL) << 8) | \ (((uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \ (((uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \ (((uint64_t)(x) & 0x00000000000000ffULL) << 56))) #if defined(__GNUC__) #if (defined(__ppc__) || defined(__ppc64__)) #include #elif (defined(__i386__) || defined(__x86_64__)) #include #else #include #endif #define OSSwapInt16(x) \ (__builtin_constant_p(x) ? OSSwapConstInt16(x) : _OSSwapInt16(x)) #define OSSwapInt32(x) \ (__builtin_constant_p(x) ? OSSwapConstInt32(x) : _OSSwapInt32(x)) #define OSSwapInt64(x) \ (__builtin_constant_p(x) ? OSSwapConstInt64(x) : _OSSwapInt64(x)) #else /* ! __GNUC__ */ #include #define OSSwapInt16(x) OSSwapConstInt16(x) #define OSSwapInt32(x) OSSwapConstInt32(x) #define OSSwapInt64(x) OSSwapConstInt64(x) #endif /* __GNUC__ */ enum { OSUnknownByteOrder, OSLittleEndian, OSBigEndian }; OS_INLINE int32_t OSHostByteOrder(void) { #if defined(__LITTLE_ENDIAN__) return OSLittleEndian; #elif defined(__BIG_ENDIAN__) return OSBigEndian; #else return OSUnknownByteOrder; #endif } #define OSReadBigInt(x, y) OSReadBigInt32(x, y) #define OSWriteBigInt(x, y, z) OSWriteBigInt32(x, y, z) #define OSSwapBigToHostInt(x) OSSwapBigToHostInt32(x) #define OSSwapHostToBigInt(x) OSSwapHostToBigInt32(x) #define OSReadLittleInt(x, y) OSReadLittleInt32(x, y) #define OSWriteLittleInt(x, y, z) OSWriteLittleInt32(x, y, z) #define OSSwapHostToLittleInt(x) OSSwapHostToLittleInt32(x) #define OSSwapLittleToHostInt(x) OSSwapLittleToHostInt32(x) /* Functions for loading native endian values. */ OS_INLINE uint16_t _OSReadInt16( const volatile void * base, uintptr_t byteOffset ) { return *(volatile uint16_t *)((uintptr_t)base + byteOffset); } OS_INLINE uint32_t _OSReadInt32( const volatile void * base, uintptr_t byteOffset ) { return *(volatile uint32_t *)((uintptr_t)base + byteOffset); } OS_INLINE uint64_t _OSReadInt64( const volatile void * base, uintptr_t byteOffset ) { return *(volatile uint64_t *)((uintptr_t)base + byteOffset); } /* Functions for storing native endian values. */ OS_INLINE void _OSWriteInt16( volatile void * base, uintptr_t byteOffset, uint16_t data ) { *(volatile uint16_t *)((uintptr_t)base + byteOffset) = data; } OS_INLINE void _OSWriteInt32( volatile void * base, uintptr_t byteOffset, uint32_t data ) { *(volatile uint32_t *)((uintptr_t)base + byteOffset) = data; } OS_INLINE void _OSWriteInt64( volatile void * base, uintptr_t byteOffset, uint64_t data ) { *(volatile uint64_t *)((uintptr_t)base + byteOffset) = data; } #if defined(__BIG_ENDIAN__) /* Functions for loading big endian to host endianess. */ #define OSReadBigInt16(base, byteOffset) _OSReadInt16(base, byteOffset) #define OSReadBigInt32(base, byteOffset) _OSReadInt32(base, byteOffset) #define OSReadBigInt64(base, byteOffset) _OSReadInt64(base, byteOffset) /* Functions for storing host endianess to big endian. */ #define OSWriteBigInt16(base, byteOffset, data) _OSWriteInt16(base, byteOffset, data) #define OSWriteBigInt32(base, byteOffset, data) _OSWriteInt32(base, byteOffset, data) #define OSWriteBigInt64(base, byteOffset, data) _OSWriteInt64(base, byteOffset, data) /* Functions for loading little endian to host endianess. */ #define OSReadLittleInt16(base, byteOffset) OSReadSwapInt16(base, byteOffset) #define OSReadLittleInt32(base, byteOffset) OSReadSwapInt32(base, byteOffset) #define OSReadLittleInt64(base, byteOffset) OSReadSwapInt64(base, byteOffset) /* Functions for storing host endianess to little endian. */ #define OSWriteLittleInt16(base, byteOffset, data) OSWriteSwapInt16(base, byteOffset, data) #define OSWriteLittleInt32(base, byteOffset, data) OSWriteSwapInt32(base, byteOffset, data) #define OSWriteLittleInt64(base, byteOffset, data) OSWriteSwapInt64(base, byteOffset, data) /* Host endianess to big endian byte swapping macros for constants. */ #define OSSwapHostToBigConstInt16(x) (x) #define OSSwapHostToBigConstInt32(x) (x) #define OSSwapHostToBigConstInt64(x) (x) /* Generic host endianess to big endian byte swapping functions. */ #define OSSwapHostToBigInt16(x) ((uint16_t)(x)) #define OSSwapHostToBigInt32(x) ((uint32_t)(x)) #define OSSwapHostToBigInt64(x) ((uint64_t)(x)) /* Host endianess to little endian byte swapping macros for constants. */ #define OSSwapHostToLittleConstInt16(x) OSSwapConstInt16(x) #define OSSwapHostToLittleConstInt32(x) OSSwapConstInt32(x) #define OSSwapHostToLittleConstInt64(x) OSSwapConstInt64(x) /* Generic host endianess to little endian byte swapping functions. */ #define OSSwapHostToLittleInt16(x) OSSwapInt16(x) #define OSSwapHostToLittleInt32(x) OSSwapInt32(x) #define OSSwapHostToLittleInt64(x) OSSwapInt64(x) /* Big endian to host endianess byte swapping macros for constants. */ #define OSSwapBigToHostConstInt16(x) (x) #define OSSwapBigToHostConstInt32(x) (x) #define OSSwapBigToHostConstInt64(x) (x) /* Generic big endian to host endianess byte swapping functions. */ #define OSSwapBigToHostInt16(x) ((uint16_t)(x)) #define OSSwapBigToHostInt32(x) ((uint32_t)(x)) #define OSSwapBigToHostInt64(x) ((uint64_t)(x)) /* Little endian to host endianess byte swapping macros for constants. */ #define OSSwapLittleToHostConstInt16(x) OSSwapConstInt16(x) #define OSSwapLittleToHostConstInt32(x) OSSwapConstInt32(x) #define OSSwapLittleToHostConstInt64(x) OSSwapConstInt64(x) /* Generic little endian to host endianess byte swapping functions. */ #define OSSwapLittleToHostInt16(x) OSSwapInt16(x) #define OSSwapLittleToHostInt32(x) OSSwapInt32(x) #define OSSwapLittleToHostInt64(x) OSSwapInt64(x) #elif defined(__LITTLE_ENDIAN__) /* Functions for loading big endian to host endianess. */ #define OSReadBigInt16(base, byteOffset) OSReadSwapInt16(base, byteOffset) #define OSReadBigInt32(base, byteOffset) OSReadSwapInt32(base, byteOffset) #define OSReadBigInt64(base, byteOffset) OSReadSwapInt64(base, byteOffset) /* Functions for storing host endianess to big endian. */ #define OSWriteBigInt16(base, byteOffset, data) OSWriteSwapInt16(base, byteOffset, data) #define OSWriteBigInt32(base, byteOffset, data) OSWriteSwapInt32(base, byteOffset, data) #define OSWriteBigInt64(base, byteOffset, data) OSWriteSwapInt64(base, byteOffset, data) /* Functions for loading little endian to host endianess. */ #define OSReadLittleInt16(base, byteOffset) _OSReadInt16(base, byteOffset) #define OSReadLittleInt32(base, byteOffset) _OSReadInt32(base, byteOffset) #define OSReadLittleInt64(base, byteOffset) _OSReadInt64(base, byteOffset) /* Functions for storing host endianess to little endian. */ #define OSWriteLittleInt16(base, byteOffset, data) _OSWriteInt16(base, byteOffset, data) #define OSWriteLittleInt32(base, byteOffset, data) _OSWriteInt32(base, byteOffset, data) #define OSWriteLittleInt64(base, byteOffset, data) _OSWriteInt64(base, byteOffset, data) /* Host endianess to big endian byte swapping macros for constants. */ #define OSSwapHostToBigConstInt16(x) OSSwapConstInt16(x) #define OSSwapHostToBigConstInt32(x) OSSwapConstInt32(x) #define OSSwapHostToBigConstInt64(x) OSSwapConstInt64(x) /* Generic host endianess to big endian byte swapping functions. */ #define OSSwapHostToBigInt16(x) OSSwapInt16(x) #define OSSwapHostToBigInt32(x) OSSwapInt32(x) #define OSSwapHostToBigInt64(x) OSSwapInt64(x) /* Host endianess to little endian byte swapping macros for constants. */ #define OSSwapHostToLittleConstInt16(x) (x) #define OSSwapHostToLittleConstInt32(x) (x) #define OSSwapHostToLittleConstInt64(x) (x) /* Generic host endianess to little endian byte swapping functions. */ #define OSSwapHostToLittleInt16(x) ((uint16_t)(x)) #define OSSwapHostToLittleInt32(x) ((uint32_t)(x)) #define OSSwapHostToLittleInt64(x) ((uint64_t)(x)) /* Big endian to host endianess byte swapping macros for constants. */ #define OSSwapBigToHostConstInt16(x) OSSwapConstInt16(x) #define OSSwapBigToHostConstInt32(x) OSSwapConstInt32(x) #define OSSwapBigToHostConstInt64(x) OSSwapConstInt64(x) /* Generic big endian to host endianess byte swapping functions. */ #define OSSwapBigToHostInt16(x) OSSwapInt16(x) #define OSSwapBigToHostInt32(x) OSSwapInt32(x) #define OSSwapBigToHostInt64(x) OSSwapInt64(x) /* Little endian to host endianess byte swapping macros for constants. */ #define OSSwapLittleToHostConstInt16(x) (x) #define OSSwapLittleToHostConstInt32(x) (x) #define OSSwapLittleToHostConstInt64(x) (x) /* Generic little endian to host endianess byte swapping functions. */ #define OSSwapLittleToHostInt16(x) ((uint16_t)(x)) #define OSSwapLittleToHostInt32(x) ((uint32_t)(x)) #define OSSwapLittleToHostInt64(x) ((uint64_t)(x)) #else #error Unknown endianess. #endif #endif /* ! _OS_OSBYTEORDER_H */