byte_swap.h revision 1.1
1 /* $NetBSD: byte_swap.h,v 1.1 1999/01/15 13:31:24 bouyer 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 /* 40 * Copyright (c) 1987, 1991 Regents of the University of California. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)endian.h 7.8 (Berkeley) 4/3/91 72 */ 73 74 #ifndef _I386_BYTE_SWAP_H_ 75 #define _I386_BYTE_SWAP_H_ 76 77 #if defined(_KERNEL) && !defined(_LKM) 78 #include "opt_cputype.h" 79 #endif 80 81 #if defined(_KERNEL) && !defined(_LKM) && !defined(I386_CPU) 82 #define __byte_swap_long_variable(x) __extension__ \ 83 ({ register in_addr_t __x = (x); \ 84 __asm ("bswap %1" \ 85 : "=r" (__x) \ 86 : "0" (__x)); \ 87 __x; }) 88 #else 89 #define __byte_swap_long_variable(x) __extension__ \ 90 ({ register in_addr_t __x = (x); \ 91 __asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ 92 : "=r" (__x) \ 93 : "0" (__x)); \ 94 __x; }) 95 #endif /* _KERNEL && ... */ 96 97 #define __byte_swap_word_variable(x) __extension__ \ 98 ({ register in_port_t __x = (x); \ 99 __asm ("rorw $8, %w1" \ 100 : "=r" (__x) \ 101 : "0" (__x)); \ 102 __x; }) 103 104 #ifdef __OPTIMIZE__ 105 106 #define __byte_swap_long_constant(x) \ 107 ((((x) & 0xff000000) >> 24) | \ 108 (((x) & 0x00ff0000) >> 8) | \ 109 (((x) & 0x0000ff00) << 8) | \ 110 (((x) & 0x000000ff) << 24)) 111 #define __byte_swap_word_constant(x) \ 112 ((((x) & 0xff00) >> 8) | \ 113 (((x) & 0x00ff) << 8)) 114 #define __byte_swap_long(x) \ 115 (__builtin_constant_p((x)) ? \ 116 __byte_swap_long_constant(x) : __byte_swap_long_variable(x)) 117 #define __byte_swap_word(x) \ 118 (__builtin_constant_p((x)) ? \ 119 __byte_swap_word_constant(x) : __byte_swap_word_variable(x)) 120 121 #else /* __OPTIMIZE__ */ 122 123 #define __byte_swap_long(x) __byte_swap_long_variable(x) 124 #define __byte_swap_word(x) __byte_swap_word_variable(x) 125 126 #endif /* __OPTIMIZE__ */ 127 128 #endif /* !_I386_BYTE_SWAP_H_ */ 129
Indexes created Thu Sep 25 16:09:42 GMT 2025