1 /* $OpenBSD: endian.h,v 1.14 2005/12/13 00:35:23 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 #if defined(_KERNEL) && !defined(I386_CPU) 33 #define __swap32md(x) ({ \ 34 uint32_t __swap32md_x = (x); \ 35 \ 36 __asm ("bswap %1" : "+r" (__swap32md_x)); \ 37 __swap32md_x; \ 38 }) 39 #else 40 #define __swap32md(x) ({ \ 41 uint32_t __swap32md_x = (x); \ 42 \ 43 __asm ("rorw $8, %w1; rorl $16, %1; rorw $8, %w1" : \ 44 "+r" (__swap32md_x)); \ 45 __swap32md_x; \ 46 }) 47 #endif /* _KERNEL && !I386_CPU */ 48 49 #define __swap64md(x) ({ \ 50 uint64_t __swap64md_x = (x); \ 51 \ 52 (uint64_t)__swap32md(__swap64md_x >> 32) | \ 53 (uint64_t)__swap32md(__swap64md_x & 0xffffffff) << 32; \ 54 }) 55 #define __swap16md(x) ({ \ 56 uint16_t __swap16md_x = (x); \ 57 \ 58 __asm ("rorw $8, %w1" : "+r" (__swap16md_x)); \ 59 __swap16md_x; \ 60 }) 61 62 /* Tell sys/endian.h we have MD variants of the swap macros. */ 63 #define MD_SWAP 64 65 #endif /* __GNUC__ */ 66 67 #define _BYTE_ORDER _LITTLE_ENDIAN 68 #include <sys/endian.h> 69 70 #endif /* _I386_ENDIAN_H_ */ 71
