/* $NetBSD: byte_swap.h,v 1.2 2014/10/29 01:33:39 dennis Exp $ */

/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef _OR1K_BYTE_SWAP_H_
#define _OR1K_BYTE_SWAP_H_

#ifdef _LOCORE

#define BSWAP16(_src, _dst, _tmp)       \
       l.extbz _dst, _src;             \
       l.slli  _dst, _dst, 8;          \
       l.srli  _tmp, _src, 8;          \
       l.extbz _tmp, _tmp;             \
       l.or    _dst, _dst, _tmp

#define BSWAP32(_src, _dst, _tmp)                               \
       l.movhi _tmp, 0xff00                                    ;\
       l.ori   _tmp, _tmp, 0xff00      /* tmp = 0xff00ff00 */  ;\
       l.slri  _dst, _tmp, 8           /* dst = 0x00ff00ff */  ;\
       l.and   _tmp, _tmp, _src        /* tmp = 0xaa00cc00 */  ;\
       l.and   _dst, _dst, _src        /* dst = 0x00bb00dd */  ;\
       l.ror   _tmp, _tmp, 24          /* tmp = 0x00cc00aa */  ;\
       l.ror   _dst, _dst, 8           /* dst = 0xdd00bb00 */  ;\
       l.or    _dst, _dst, _tmp        /* dst = 0xddccbbaa */  ;\

#else

#include <sys/types.h>
__BEGIN_DECLS

#define __BYTE_SWAP_U64_VARIABLE __byte_swap_u64_variable
static __inline uint64_t
__byte_swap_u64_variable(uint64_t v)
{
       v =   ((v & 0x000000ff) << (56 -  0)) | ((v >> (56 -  0)) & 0x000000ff)
           | ((v & 0x0000ff00) << (48 -  8)) | ((v >> (48 -  8)) & 0x0000ff00)
           | ((v & 0x00ff0000) << (40 - 16)) | ((v >> (40 - 16)) & 0x00ff0000)
           | ((v & 0xff000000) << (32 - 24)) | ((v >> (32 - 24)) & 0xff000000);

       return v;
}

#define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
static __inline uint32_t
__byte_swap_u32_variable(uint32_t v)
{
       v =   ((v & 0x00ff) << (24 - 0)) | ((v >> (24 - 0)) & 0x00ff)
           | ((v & 0xff00) << (16 - 8)) | ((v >> (16 - 8)) & 0xff00);

       return v;
}

#define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
static __inline uint16_t
__byte_swap_u16_variable(uint16_t v)
{
       v &= 0xffff;
       v = (v >> 8) | (v << 8);

       return v;
}

__END_DECLS

#endif  /* _LOCORE */

#endif /* _OR1K_BYTE_SWAP_H_ */