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      1 /*	$NetBSD: byte_swap.h,v 1.12 2017/01/14 16:21:28 christos 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 
     37 #ifdef __GNUC__
     38 #include <sys/types.h>
     39 __BEGIN_DECLS
     40 
     41 #define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
     42 static __inline uint32_t __attribute__((__unused__))
     43 __byte_swap_u32_variable(uint32_t x)
     44 {
     45 	uint32_t y;
     46 
     47 	__asm volatile(
     48 		"rotl	$-8, %1, %0	\n"
     49 		"insv	%0, $16, $8, %0	\n"
     50 		"rotl	$8, %1, %%r1	\n"
     51 		"movb	%%r1, %0"
     52 		: "=&r" (y)
     53 		: "r" (x)
     54 		: "r1", "cc");
     55 
     56 	return (y);
     57 }
     58 
     59 #define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
     60 static __inline uint16_t __attribute__((__unused__))
     61 __byte_swap_u16_variable(uint16_t x)
     62 {
     63 
     64 	return (uint16_t)(x << 8 | x >> 8);
     65 }
     66 
     67 __END_DECLS
     68 #endif
     69 #endif /* _VAX_BYTE_SWAP_H_ */
     70