1 /* $NetBSD: byte_swap.h,v 1.3 2001/05/30 12:28:44 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #ifndef _I386_BYTE_SWAP_H_ 40 #define _I386_BYTE_SWAP_H_ 41 42 #if defined(_KERNEL_OPT) 43 #include "opt_cputype.h" 44 #endif 45 46 #if defined(_KERNEL) && !defined(_LKM) && !defined(I386_CPU) 47 #define __byte_swap_long_variable(x) __extension__ \ 48 ({ register in_addr_t __x = (x); \ 49 __asm ("bswap %1" \ 50 : "=r" (__x) \ 51 : "0" (__x)); \ 52 __x; }) 53 #else 54 #define __byte_swap_long_variable(x) __extension__ \ 55 ({ register in_addr_t __x = (x); \ 56 __asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ 57 : "=r" (__x) \ 58 : "0" (__x)); \ 59 __x; }) 60 #endif /* _KERNEL && ... */ 61 62 #define __byte_swap_word_variable(x) __extension__ \ 63 ({ register in_port_t __x = (x); \ 64 __asm ("rorw $8, %w1" \ 65 : "=r" (__x) \ 66 : "0" (__x)); \ 67 __x; }) 68 69 #ifdef __OPTIMIZE__ 70 71 #define __byte_swap_long_constant(x) \ 72 ((((x) & 0xff000000) >> 24) | \ 73 (((x) & 0x00ff0000) >> 8) | \ 74 (((x) & 0x0000ff00) << 8) | \ 75 (((x) & 0x000000ff) << 24)) 76 #define __byte_swap_word_constant(x) \ 77 ((((x) & 0xff00) >> 8) | \ 78 (((x) & 0x00ff) << 8)) 79 #define __byte_swap_long(x) \ 80 (__builtin_constant_p((x)) ? \ 81 __byte_swap_long_constant(x) : __byte_swap_long_variable(x)) 82 #define __byte_swap_word(x) \ 83 (__builtin_constant_p((x)) ? \ 84 __byte_swap_word_constant(x) : __byte_swap_word_variable(x)) 85 86 #else /* __OPTIMIZE__ */ 87 88 #define __byte_swap_long(x) __byte_swap_long_variable(x) 89 #define __byte_swap_word(x) __byte_swap_word_variable(x) 90 91 #endif /* __OPTIMIZE__ */ 92 93 #endif /* !_I386_BYTE_SWAP_H_ */ 94