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Annotation of sys/arch/amd64/include/endian.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: endian.h,v 1.3 2005/12/13 00:35:22 millert Exp $      */
                      2:
                      3: /*-
                      4:  * Copyright (c) 1997 Niklas Hallqvist.  All rights reserved.
                      5:  *
                      6:  * Redistribution and use in source and binary forms, with or without
                      7:  * modification, are permitted provided that the following conditions
                      8:  * are met:
                      9:  * 1. Redistributions of source code must retain the above copyright
                     10:  *    notice, this list of conditions and the following disclaimer.
                     11:  * 2. Redistributions in binary form must reproduce the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer in the
                     13:  *    documentation and/or other materials provided with the distribution.
                     14:  *
                     15:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     17:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     18:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     19:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     20:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     21:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     22:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     23:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     24:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     25:  */
                     26:
                     27: #ifndef _I386_ENDIAN_H_
                     28: #define _I386_ENDIAN_H_
                     29:
                     30: #ifdef __GNUC__
                     31:
                     32: #define        __swap32md(x) ({                                                \
                     33:        u_int32_t __swap32md_x = (x);                                   \
                     34:                                                                        \
                     35:        __asm ("bswap %1" : "+r" (__swap32md_x));                       \
                     36:        __swap32md_x;                                                   \
                     37: })
                     38:
                     39: /* XXX - I'm sure there is a better way on this cpu. */
                     40: #define        __swap64md(x) ({                                                \
                     41:        u_int64_t __swap64md_x = (x);                                   \
                     42:                                                                        \
                     43:        (u_int64_t)__swap32md(__swap64md_x >> 32) |                     \
                     44:            (u_int64_t)__swap32md(__swap64md_x & 0xffffffff) << 32;     \
                     45: })
                     46:
                     47: #define        __swap16md(x) ({                                                \
                     48:        u_int16_t __swap16md_x = (x);                                   \
                     49:                                                                        \
                     50:        __asm ("rorw $8, %w1" : "+r" (__swap16md_x));                   \
                     51:        __swap16md_x;                                                   \
                     52: })
                     53:
                     54: /* Tell sys/endian.h we have MD variants of the swap macros.  */
                     55: #define MD_SWAP
                     56:
                     57: #endif /* __GNUC__ */
                     58:
                     59: #define _BYTE_ORDER _LITTLE_ENDIAN
                     60: #include <sys/endian.h>
                     61:
                     62: #endif /* _I386_ENDIAN_H_ */