freebsd-dev/sys/i386/include/endian.h

121 lines
3.6 KiB
C

/*
* Copyright (c) 1987, 1991 Regents of the University of California.
* All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: @(#)endian.h 7.8 (Berkeley) 4/3/91
* $FreeBSD$
*/
#ifndef _MACHINE_ENDIAN_H_
#define _MACHINE_ENDIAN_H_
/*
* Define the order of 32-bit words in 64-bit words.
*/
#define _QUAD_HIGHWORD 1
#define _QUAD_LOWWORD 0
#ifndef _POSIX_SOURCE
/*
* Definitions for byte order, according to byte significance from low
* address to high.
*/
#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
#define BYTE_ORDER LITTLE_ENDIAN
#ifndef _KERNEL
#include <sys/cdefs.h>
#endif
#include <machine/ansi.h>
__BEGIN_DECLS
__uint32_t htonl(__uint32_t);
__uint16_t htons(__uint16_t);
__uint32_t ntohl(__uint32_t);
__uint16_t ntohs(__uint16_t);
__END_DECLS
#ifdef __GNUC__
static __inline __uint32_t
__uint16_swap_uint32(__uint32_t __x)
{
__asm ("rorl $16, %1" : "=r" (__x) : "0" (__x));
return __x;
}
static __inline __uint32_t
__uint8_swap_uint32(__uint32_t __x)
{
#if defined(_KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU)
__asm ("bswap %0" : "=r" (__x) : "0" (__x));
#else
__asm ("xchgb %h1, %b1\n\t"
"rorl $16, %1\n\t"
"xchgb %h1, %b1"
: "=q" (__x) : "0" (__x));
#endif
return __x;
}
static __inline __uint16_t
__uint8_swap_uint16(__uint16_t __x)
{
__asm ("xchgb %h1, %b1" : "=q" (__x) : "0" (__x));
return __x;
}
/*
* Macros for network/external number representation conversion.
*/
#define ntohl __uint8_swap_uint32
#define ntohs __uint8_swap_uint16
#define htonl __uint8_swap_uint32
#define htons __uint8_swap_uint16
#endif /* __GNUC__ */
#define NTOHL(x) ((x) = ntohl(x))
#define NTOHS(x) ((x) = ntohs(x))
#define HTONL(x) ((x) = htonl(x))
#define HTONS(x) ((x) = htons(x))
#endif /* ! _POSIX_SOURCE */
#endif /* !_MACHINE_ENDIAN_H_ */