1 /* $NetBSD: byte_swap.h,v 1.10 2006/01/30 22:46:36 dsl Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1991 Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)endian.h 7.8 (Berkeley) 4/3/91 32 */ 33 34 #ifndef _VAX_BYTE_SWAP_H_ 35 #define _VAX_BYTE_SWAP_H_ 36 #ifdef __GNUC__ 37 #include <sys/types.h> 38 __BEGIN_DECLS 39 40 #include <sys/types.h> 41 42 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable 43 static __inline uint32_t __attribute__((__unused__)) 44 __byte_swap_u32_variable(uint32_t x) 45 { 46 uint32_t y; 47 48 __asm volatile( 49 "rotl $-8, %1, %0 \n" 50 "insv %0, $16, $8, %0 \n" 51 "rotl $8, %1, %%r1 \n" 52 "movb %%r1, %0" 53 : "=&r" (y) 54 : "r" (x) 55 : "r1", "cc"); 56 57 return (y); 58 } 59 60 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable 61 static __inline uint16_t __attribute__((__unused__)) 62 __byte_swap_u16_variable(uint16_t x) 63 { 64 65 return (x << 8 | x >> 8); 66 } 67 68 __END_DECLS 69 #endif 70 #endif /* _VAX_BYTE_SWAP_H_ */ 71