diff options
Diffstat (limited to 'sys/i386/include/endian.h')
| -rw-r--r-- | sys/i386/include/endian.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/sys/i386/include/endian.h b/sys/i386/include/endian.h new file mode 100644 index 0000000..dc4e98c --- /dev/null +++ b/sys/i386/include/endian.h @@ -0,0 +1,120 @@ +/* + * 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 + * $Id: endian.h,v 1.3 1993/11/07 17:42:52 wollman Exp $ + */ + +#ifndef _MACHINE_ENDIAN_H_ +#define _MACHINE_ENDIAN_H_ 1 + +/* + * Define the order of 32-bit words in 64-bit words. + */ +#define _QUAD_HIGHWORD 1 +#define _QUAD_LOWWORD 0 + +/* + * 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 + +#define __word_swap_long(x) \ +({ register u_long X = (x); \ + asm ("rorl $16, %1" \ + : "=r" (X) \ + : "0" (X)); \ + X; }) +#if __GNUC__ >= 2 +#define __byte_swap_long(x) \ +({ register u_long X = (x); \ + asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \ + : "=q" (X) \ + : "0" (X)); \ + X; }) +#define __byte_swap_word(x) \ +({ register u_short X = (x); \ + asm ("xchgb %h1, %b1" \ + : "=q" (X) \ + : "0" (X)); \ + X; }) +#else /* __GNUC__ >= 2 */ +#define __byte_swap_long(x) \ +({ register u_long X = (x); \ + asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ + : "=r" (X) \ + : "0" (X)); \ + X; }) +#define __byte_swap_word(x) \ +({ register u_short X = (x); \ + asm ("rorw $8, %w1" \ + : "=r" (X) \ + : "0" (X)); \ + X; }) +#endif /* __GNUC__ >= 2 */ + +/* + * Macros for network/external number representation conversion. + */ +#if BYTE_ORDER == BIG_ENDIAN && !defined(lint) +#define ntohl(x) (x) +#define ntohs(x) (x) +#define htonl(x) (x) +#define htons(x) (x) + +#define NTOHL(x) (x) +#define NTOHS(x) (x) +#define HTONL(x) (x) +#define HTONS(x) (x) + +#else + +#define ntohl __byte_swap_long +#define ntohs __byte_swap_word +#define htonl __byte_swap_long +#define htons __byte_swap_word + +#define NTOHL(x) (x) = ntohl((u_long)x) +#define NTOHS(x) (x) = ntohs((u_short)x) +#define HTONL(x) (x) = htonl((u_long)x) +#define HTONS(x) (x) = htons((u_short)x) +#endif +#endif /* _MACHINE_ENDIAN_H_ */ |
