f6aac1c3b5
Moving include/sys NetBSD headers to /sys/sys Moving include/arch/*/ NetBSD headers to /sys/arch/*/include Change-Id: Ia1a45d4e83ab806c84093ec2b61bdbea9bed65a0
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
/* $NetBSD: byte_swap.h,v 1.12 2012/09/05 01:03:53 matt Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1997, 1999, 2002 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Charles M. Hannum, Neil A. Carson, and Jason R. Thorpe.
|
|
*
|
|
* 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 _ARM_BYTE_SWAP_H_
|
|
#define _ARM_BYTE_SWAP_H_
|
|
|
|
#ifdef _LOCORE
|
|
|
|
#if defined(_ARM_ARCH_6) || defined(_ARM_ARCH_7)
|
|
|
|
#define BSWAP16(_src, _dst, _tmp) \
|
|
rev16 _dst, _src
|
|
#define BSWAP32(_src, _dst, _tmp) \
|
|
rev _dst, _src
|
|
|
|
#else
|
|
|
|
#define BSWAP16(_src, _dst, _tmp) \
|
|
mov _tmp, _src, ror #8 ;\
|
|
orr _tmp, _tmp, _tmp, lsr #16 ;\
|
|
bic _dst, _tmp, _tmp, lsl #16
|
|
|
|
#define BSWAP32(_src, _dst, _tmp) \
|
|
eor _tmp, _src, _src, ror #16 ;\
|
|
bic _tmp, _tmp, #0x00FF0000 ;\
|
|
mov _dst, _src, ror #8 ;\
|
|
eor _dst, _dst, _tmp, lsr #8
|
|
|
|
#endif
|
|
|
|
|
|
#else
|
|
|
|
#ifdef __GNUC__
|
|
#include <sys/types.h>
|
|
__BEGIN_DECLS
|
|
|
|
#define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
|
|
static __inline uint32_t
|
|
__byte_swap_u32_variable(uint32_t v)
|
|
{
|
|
uint32_t t1;
|
|
|
|
#ifdef _ARM_ARCH_6
|
|
if (!__builtin_constant_p(v)) {
|
|
__asm("rev\t%0, %1" : "=r" (v) : "0" (v));
|
|
return v;
|
|
}
|
|
#endif
|
|
|
|
t1 = v ^ ((v << 16) | (v >> 16));
|
|
t1 &= 0xff00ffffU;
|
|
v = (v >> 8) | (v << 24);
|
|
v ^= (t1 >> 8);
|
|
|
|
return (v);
|
|
}
|
|
|
|
#define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
|
|
static __inline uint16_t
|
|
__byte_swap_u16_variable(uint16_t v)
|
|
{
|
|
|
|
#ifdef _ARM_ARCH_6
|
|
if (!__builtin_constant_p(v)) {
|
|
__asm("rev16\t%0, %1" : "=r" (v) : "0" (v));
|
|
return v;
|
|
}
|
|
#elif !defined(__thumb__) && 0 /* gcc produces decent code for this */
|
|
if (!__builtin_constant_p(v)) {
|
|
uint32_t v0 = v;
|
|
__asm volatile(
|
|
"mov %0, %1, ror #8\n"
|
|
"orr %0, %0, %0, lsr #16\n"
|
|
"bic %0, %0, %0, lsl #16"
|
|
: "=&r" (v0)
|
|
: "0" (v0));
|
|
return v0;
|
|
}
|
|
#endif
|
|
v &= 0xffff;
|
|
v = (v >> 8) | (v << 8);
|
|
|
|
return (v);
|
|
}
|
|
|
|
__END_DECLS
|
|
#endif
|
|
|
|
#endif /* _LOCORE */
|
|
|
|
#endif /* _ARM_BYTE_SWAP_H_ */
|