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      1 /*	$OpenBSD: endian.h,v 1.14 2005/12/13 00:35:23 millert Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997 Niklas Hallqvist.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef _I386_ENDIAN_H_
     28 #define _I386_ENDIAN_H_
     29 
     30 #ifdef __GNUC__
     31 
     32 #if defined(_KERNEL) && !defined(I386_CPU)
     33 #define	__swap32md(x) ({						\
     34 	u_int32_t __swap32md_x = (x);					\
     35 									\
     36 	__asm ("bswap %1" : "+r" (__swap32md_x));			\
     37 	__swap32md_x;							\
     38 })
     39 #else
     40 #define	__swap32md(x) ({						\
     41 	u_int32_t __swap32md_x = (x);					\
     42 									\
     43 	__asm ("rorw $8, %w1; rorl $16, %1; rorw $8, %w1" :		\
     44 	    "+r" (__swap32md_x));					\
     45 	__swap32md_x;							\
     46 })
     47 #endif	/* _KERNEL && !I386_CPU */
     48 
     49 #define	__swap64md(x) ({						\
     50 	u_int64_t __swap64md_x = (x);					\
     51 									\
     52 	(u_int64_t)__swap32md(__swap64md_x >> 32) |			\
     53 	    (u_int64_t)__swap32md(__swap64md_x & 0xffffffff) << 32;	\
     54 })
     55 #define	__swap16md(x) ({						\
     56 	u_int16_t __swap16md_x = (x);					\
     57 									\
     58 	__asm ("rorw $8, %w1" : "+r" (__swap16md_x));			\
     59 	__swap16md_x;							\
     60 })
     61 
     62 /* Tell sys/endian.h we have MD variants of the swap macros.  */
     63 #define MD_SWAP
     64 
     65 #endif	/* __GNUC__ */
     66 
     67 #define _BYTE_ORDER _LITTLE_ENDIAN
     68 #include <sys/endian.h>
     69 
     70 #endif /* _I386_ENDIAN_H_ */
     71