1 /* $OpenBSD: endian.h,v 1.12 2001/06/27 04:12:45 mickey 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 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Niklas Hallqvist. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _I386_ENDIAN_H_ 33 #define _I386_ENDIAN_H_ 34 35 #ifdef __GNUC__ 36 37 #if defined(_KERNEL) && !defined(I386_CPU) 38 #define __swap32md(x) ({ \ 39 u_int32_t __swap32md_x = (x); \ 40 \ 41 __asm ("bswap %1" : "+r" (__swap32md_x)); \ 42 __swap32md_x; \ 43 }) 44 #else 45 #define __swap32md(x) ({ \ 46 u_int32_t __swap32md_x = (x); \ 47 \ 48 __asm ("rorw $8, %w1; rorl $16, %1; rorw $8, %w1" : \ 49 "+r" (__swap32md_x)); \ 50 __swap32md_x; \ 51 }) 52 #endif /* _KERNEL && !I386_CPU */ 53 54 #define __swap64md(x) ({ \ 55 u_int64_t __swap64md_x = (x); \ 56 \ 57 (u_int64_t)__swap32md(__swap64md_x >> 32) | \ 58 (u_int64_t)__swap32md(__swap64md_x & 0xffffffff) << 32; \ 59 }) 60 #define __swap16md(x) ({ \ 61 u_int16_t __swap16md_x = (x); \ 62 \ 63 __asm ("rorw $8, %w1" : "+r" (__swap16md_x)); \ 64 __swap16md_x; \ 65 }) 66 67 /* Tell sys/endian.h we have MD variants of the swap macros. */ 68 #define MD_SWAP 69 70 #endif /* __GNUC__ */ 71 72 #define BYTE_ORDER LITTLE_ENDIAN 73 #include <sys/endian.h> 74 75 #endif /* _I386_ENDIAN_H_ */ 76