1/* 2 * Copyright (c) 2000-2010 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/*- 29 * Copyright (c) 1990, 1993 30 * The Regents of the University of California. All rights reserved. 31 * (c) UNIX System Laboratories, Inc. 32 * All or some portions of this file are derived from material licensed 33 * to the University of California by American Telephone and Telegraph 34 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 35 * the permission of UNIX System Laboratories, Inc. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)param.h 8.1 (Berkeley) 4/4/95 66 */ 67 68/* 69 * Machine dependent constants for Intel 386. 70 */ 71 72#ifndef _I386_PARAM_H_ 73#define _I386_PARAM_H_ 74 75#include <i386/_param.h> 76 77/* 78 * Round p (pointer or byte index) up to a correctly-aligned value for all 79 * data types (int, long, ...). The result is unsigned int and must be 80 * cast to any desired pointer type. 81 */ 82#define ALIGNBYTES __DARWIN_ALIGNBYTES 83#define ALIGN(p) __DARWIN_ALIGN(p) 84 85#define NBPG 4096 /* bytes/page */ 86#define PGOFSET (NBPG-1) /* byte offset into page */ 87#define PGSHIFT 12 /* LOG2(NBPG) */ 88 89#define DEV_BSIZE 512 90#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 91#define BLKDEV_IOSIZE 2048 92#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 93 94#define CLSIZE 1 95#define CLSIZELOG2 0 96 97/* 98 * Constants related to network buffer management. 99 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 100 * on machines that exchange pages of input or output buffers with mbuf 101 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 102 * of the hardware page size. 103 */ 104#define MSIZESHIFT 8 /* 256 */ 105#define MSIZE (1 << MSIZESHIFT) /* size of an mbuf */ 106#define MCLSHIFT 11 /* 2048 */ 107#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 108#define MBIGCLSHIFT 12 /* 4096 */ 109#define MBIGCLBYTES (1 << MBIGCLSHIFT) /* size of a big cluster */ 110#define M16KCLSHIFT 14 /* 16384 */ 111#define M16KCLBYTES (1 << M16KCLSHIFT) /* size of a jumbo cluster */ 112 113#define MCLOFSET (MCLBYTES - 1) 114#ifndef NMBCLUSTERS 115#define NMBCLUSTERS ((1024 * 1024) / MCLBYTES) /* cl map size: 1MB */ 116#endif 117 118/* 119 * Some macros for units conversion 120 */ 121/* Core clicks (NeXT_page_size bytes) to segments and vice versa */ 122#define ctos(x) (x) 123#define stoc(x) (x) 124 125/* Core clicks (4096 bytes) to disk blocks */ 126#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 127#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 128#define dtob(x) ((x)<<DEV_BSHIFT) 129 130/* clicks to bytes */ 131#define ctob(x) ((x)<<PGSHIFT) 132 133/* bytes to clicks */ 134#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 135 136#ifdef __APPLE__ 137#define btodb(bytes, devBlockSize) \ 138 ((unsigned)(bytes) / devBlockSize) 139#define dbtob(db, devBlockSize) \ 140 ((unsigned)(db) * devBlockSize) 141#else 142#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 143 ((unsigned)(bytes) >> DEV_BSHIFT) 144#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 145 ((unsigned)(db) << DEV_BSHIFT) 146#endif 147 148/* 149 * Map a ``block device block'' to a file system block. 150 * This should be device dependent, and will be if we 151 * add an entry to cdevsw/bdevsw for that purpose. 152 * For now though just use DEV_BSIZE. 153 */ 154#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 155 156/* 157 * Macros to decode (and encode) processor status word. 158 */ 159#define STATUS_WORD(rpl, ipl) (((ipl) << 8) | (rpl)) 160#define USERMODE(x) (((x) & 3) == 3) 161#define BASEPRI(x) (((x) & (255 << 8)) == 0) 162 163 164#if defined(KERNEL) || defined(STANDALONE) 165#define DELAY(n) delay(n) 166 167#else /* defined(KERNEL) || defined(STANDALONE) */ 168#define DELAY(n) { register int N = (n); while (--N > 0); } 169#endif /* defined(KERNEL) || defined(STANDALONE) */ 170 171#endif /* _I386_PARAM_H_ */ 172