1 /* $NetBSD: byte_swap.h,v 1.9 2008/04/28 20:23:26 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Leo Weppelman. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef M68K_BYTE_SWAP_H_ 33 #define M68K_BYTE_SWAP_H_ 34 35 #ifdef __GNUC__ 36 #include <sys/types.h> 37 __BEGIN_DECLS 38 39 40 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable 41 static __inline uint16_t __byte_swap_u16_variable(uint16_t); 42 static __inline uint16_t 43 __byte_swap_u16_variable(uint16_t var) 44 { 45 __asm volatile ("rorw #8, %0" : "=d" (var) : "0" (var)); 46 return (var); 47 } 48 49 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable 50 static __inline uint32_t __byte_swap_u32_variable(uint32_t); 51 static __inline uint32_t 52 __byte_swap_u32_variable(uint32_t var) 53 { 54 __asm volatile ( 55 "rorw #8, %0; swap %0; rorw #8, %0" : "=d" (var) : "0" (var)); 56 return (var); 57 } 58 59 __END_DECLS 60 #endif 61 62 #endif /* !M68K_BYTE_SWAP_H_ */ 63