Home | History | Annotate | Line # | Download | only in include 
      1 /* $NetBSD: byte_swap.h,v 1.2 2014/10/29 01:33:39 dennis Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _OR1K_BYTE_SWAP_H_
     33 #define	_OR1K_BYTE_SWAP_H_
     34 
     35 #ifdef _LOCORE
     36 
     37 #define	BSWAP16(_src, _dst, _tmp)	\
     38 	l.extbz	_dst, _src;		\
     39 	l.slli	_dst, _dst, 8;		\
     40 	l.srli	_tmp, _src, 8;		\
     41 	l.extbz	_tmp, _tmp;		\
     42 	l.or	_dst, _dst, _tmp
     43 
     44 #define BSWAP32(_src, _dst, _tmp)				\
     45 	l.movhi	_tmp, 0xff00					;\
     46 	l.ori	_tmp, _tmp, 0xff00	/* tmp = 0xff00ff00 */	;\
     47 	l.slri	_dst, _tmp, 8		/* dst = 0x00ff00ff */	;\
     48 	l.and	_tmp, _tmp, _src	/* tmp = 0xaa00cc00 */	;\
     49 	l.and	_dst, _dst, _src	/* dst = 0x00bb00dd */	;\
     50 	l.ror	_tmp, _tmp, 24		/* tmp = 0x00cc00aa */	;\
     51 	l.ror	_dst, _dst, 8		/* dst = 0xdd00bb00 */	;\
     52 	l.or	_dst, _dst, _tmp	/* dst = 0xddccbbaa */	;\
     53 
     54 #else
     55 
     56 #include <sys/types.h>
     57 __BEGIN_DECLS
     58 
     59 #define	__BYTE_SWAP_U64_VARIABLE __byte_swap_u64_variable
     60 static __inline uint64_t
     61 __byte_swap_u64_variable(uint64_t v)
     62 {
     63 	v =   ((v & 0x000000ff) << (56 -  0)) | ((v >> (56 -  0)) & 0x000000ff)
     64 	    | ((v & 0x0000ff00) << (48 -  8)) | ((v >> (48 -  8)) & 0x0000ff00)
     65 	    | ((v & 0x00ff0000) << (40 - 16)) | ((v >> (40 - 16)) & 0x00ff0000)
     66 	    | ((v & 0xff000000) << (32 - 24)) | ((v >> (32 - 24)) & 0xff000000);
     67 
     68 	return v;
     69 }
     70 
     71 #define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
     72 static __inline uint32_t
     73 __byte_swap_u32_variable(uint32_t v)
     74 {
     75 	v =   ((v & 0x00ff) << (24 - 0)) | ((v >> (24 - 0)) & 0x00ff)
     76 	    | ((v & 0xff00) << (16 - 8)) | ((v >> (16 - 8)) & 0xff00);
     77 
     78 	return v;
     79 }
     80 
     81 #define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
     82 static __inline uint16_t
     83 __byte_swap_u16_variable(uint16_t v)
     84 {
     85 	v &= 0xffff;
     86 	v = (v >> 8) | (v << 8);
     87 
     88 	return v;
     89 }
     90 
     91 __END_DECLS
     92 
     93 #endif	/* _LOCORE */
     94 
     95 #endif /* _OR1K_BYTE_SWAP_H_ */
     96