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      1  1.17     rin /*	$NetBSD: byte_swap.h,v 1.17 2020/08/10 10:59:33 rin Exp $	*/
      2   1.1  bouyer 
      3   1.1  bouyer /*-
      4   1.1  bouyer  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5   1.1  bouyer  * All rights reserved.
      6   1.1  bouyer  *
      7   1.1  bouyer  * This code is derived from software contributed to The NetBSD Foundation
      8   1.1  bouyer  * by Charles M. Hannum.
      9   1.1  bouyer  *
     10   1.1  bouyer  * Redistribution and use in source and binary forms, with or without
     11   1.1  bouyer  * modification, are permitted provided that the following conditions
     12   1.1  bouyer  * are met:
     13   1.1  bouyer  * 1. Redistributions of source code must retain the above copyright
     14   1.1  bouyer  *    notice, this list of conditions and the following disclaimer.
     15   1.1  bouyer  * 2. Redistributions in binary form must reproduce the above copyright
     16   1.1  bouyer  *    notice, this list of conditions and the following disclaimer in the
     17   1.1  bouyer  *    documentation and/or other materials provided with the distribution.
     18   1.1  bouyer  *
     19   1.1  bouyer  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20   1.1  bouyer  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21   1.1  bouyer  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22   1.1  bouyer  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23   1.1  bouyer  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24   1.1  bouyer  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25   1.1  bouyer  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26   1.1  bouyer  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27   1.1  bouyer  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28   1.1  bouyer  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29   1.1  bouyer  * POSSIBILITY OF SUCH DAMAGE.
     30   1.1  bouyer  */
     31   1.1  bouyer 
     32   1.1  bouyer #ifndef _I386_BYTE_SWAP_H_
     33   1.1  bouyer #define	_I386_BYTE_SWAP_H_
     34   1.5   lukem 
     35   1.5   lukem #include <sys/types.h>
     36   1.1  bouyer 
     37  1.10     dsl #ifdef  __GNUC__
     38  1.10     dsl __BEGIN_DECLS
     39   1.4   lukem 
     40  1.10     dsl #define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
     41  1.10     dsl static __inline uint32_t __byte_swap_u32_variable(uint32_t);
     42   1.9   perry static __inline uint32_t
     43  1.10     dsl __byte_swap_u32_variable(uint32_t x)
     44   1.4   lukem {
     45   1.7   perry 	__asm volatile (
     46   1.4   lukem 	    "bswap %1"
     47   1.4   lukem 	    : "=r" (x) : "0" (x));
     48   1.6   lukem 	return (x);
     49   1.4   lukem }
     50   1.4   lukem 
     51  1.10     dsl #define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
     52  1.10     dsl static __inline uint16_t __byte_swap_u16_variable(uint16_t);
     53   1.9   perry static __inline uint16_t
     54  1.10     dsl __byte_swap_u16_variable(uint16_t x)
     55   1.4   lukem {
     56  1.16   skrll 	__asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x));
     57   1.6   lukem 	return (x);
     58   1.4   lukem }
     59   1.1  bouyer 
     60  1.10     dsl __END_DECLS
     61  1.17     rin #elif defined(_KERNEL)
     62  1.12      ad #define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
     63  1.12      ad #define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
     64  1.12      ad uint32_t	__byte_swap_u32_variable(uint32_t);
     65  1.12      ad uint16_t	__byte_swap_u16_variable(uint16_t);
     66  1.10     dsl #endif
     67   1.1  bouyer 
     68   1.1  bouyer #endif /* !_I386_BYTE_SWAP_H_ */
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