1 /* $NetBSD: byte_swap.h,v 1.10 2006/01/30 22:46:36 dsl 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 Charles M. Hannum. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #ifndef _I386_BYTE_SWAP_H_ 40 #define _I386_BYTE_SWAP_H_ 41 42 #include <sys/types.h> 43 44 #if defined(_KERNEL_OPT) 45 #include "opt_cputype.h" 46 #endif 47 48 #ifdef __GNUC__ 49 #include <sys/types.h> 50 __BEGIN_DECLS 51 52 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable 53 static __inline uint32_t __byte_swap_u32_variable(uint32_t); 54 static __inline uint32_t 55 __byte_swap_u32_variable(uint32_t x) 56 { 57 __asm volatile ( 58 #if defined(_KERNEL) && !defined(_LKM) && !defined(I386_CPU) 59 "bswap %1" 60 #else 61 "rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" 62 #endif 63 : "=r" (x) : "0" (x)); 64 return (x); 65 } 66 67 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable 68 static __inline uint16_t __byte_swap_u16_variable(uint16_t); 69 static __inline uint16_t 70 __byte_swap_u16_variable(uint16_t x) 71 { 72 __asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x)); 73 return (x); 74 } 75 76 __END_DECLS 77 #endif 78 79 #endif /* !_I386_BYTE_SWAP_H_ */ 80
