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byte_swap.h revision 1.2 
      1 /*	$NetBSD: byte_swap.h,v 1.2 2003/10/06 05:27:19 matt Exp $	*/
      2 
      3 /*	$OpenBSD: endian.h,v 1.7 2001/06/29 20:28:54 mickey Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 1998-2001 Michael Shalayeff
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by Michael Shalayeff.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 #ifndef _HPPA_BYTE_SWAP_H_
     36 #define	_HPPA_BYTE_SWAP_H_
     37 
     38 static __inline u_int16_t __byte_swap_word __P((u_int16_t));
     39 static __inline u_int32_t __byte_swap_long __P((u_int32_t));
     40 
     41 static __inline u_int32_t
     42 __byte_swap_long(u_int32_t x)
     43 {
     44 	register in_addr_t __swap32md_x;	\
     45 						\
     46 	__asm  ("extru	%1, 7,8,%%r22\n\t"	\
     47 		"shd	%1,%1,8,%0\n\t"		\
     48 		"dep	%0,15,8,%0\n\t"		\
     49 		"dep	%%r22,31,8,%0"		\
     50 		: "=&r" (__swap32md_x)		\
     51 		: "r" (x) : "r22");		\
     52 	return(__swap32md_x);
     53 }
     54 
     55 #if 0
     56 /*
     57  * Use generic C version because w/ asm inline below
     58  * gcc inserts extra "extru r,31,16,r" to convert
     59  * to 16 bit entity, which produces overhead we don't need.
     60  * Besides, gcc does swap16 same way by itself.
     61  */
     62 #define	__swap16md(x)	__swap16gen(x)
     63 #else
     64 static __inline u_int16_t
     65 __byte_swap_word(u_int16_t x)
     66 {
     67 	register in_port_t __swap16md_x;				\
     68 									\
     69 	__asm  ("extru	%1,23,8,%0\n\t"					\
     70 		"dep	%1,23,8,%0"					\
     71 	       : "=&r" (__swap16md_x) : "r" (x));			\
     72 	return(__swap16md_x);
     73 }
     74 #endif
     75 
     76 #endif /* !_HPPA_BYTE_SWAP_H_ */
     77