| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 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 | u_int32_t __swap32md_x = (x); \ |
| 35 | \ |
| 36 | __asm ("bswap %1" : "+r" (__swap32md_x)); \ |
| 37 | __swap32md_x; \ |
| 38 | }) |
| 39 | #else |
| 40 | #define __swap32md(x) ({ \ |
| 41 | u_int32_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 | u_int64_t __swap64md_x = (x); \ |
| 51 | \ |
| 52 | (u_int64_t)__swap32md(__swap64md_x >> 32) | \ |
| 53 | (u_int64_t)__swap32md(__swap64md_x & 0xffffffff) << 32; \ |
| 54 | }) |
| 55 | #define __swap16md(x) ({ \ |
| 56 | u_int16_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_ */ |