1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)param.h 5.8 (Berkeley) 6/28/91 37 * $FreeBSD: src/sys/i386/include/param.h,v 1.62 2001/09/12 08:37:33 julian Exp $ 38 */ 39 40 /* 41 * Machine dependent constants for Intel 386. 42 */ 43 44 #ifndef _MACHINE_PARAM_H_ 45 #define _MACHINE_PARAM_H_ 46 47 #ifndef MACHINE 48 #define MACHINE "i386" 49 #endif 50 #ifndef MACHINE_ARCH 51 #define MACHINE_ARCH "i386" 52 #endif 53 #define MID_MACHINE MID_I386 54 55 /* Endian-ness */ 56 #ifndef BIG_ENDIAN 57 #define BIG_ENDIAN 4321 58 #endif 59 #ifndef LITTLE_ENDIAN 60 #define LITTLE_ENDIAN 1234 61 #endif 62 63 #ifndef BYTE_ORDER 64 #define BYTE_ORDER LITTLE_ENDIAN 65 #endif 66 67 /* 68 * OBJFORMAT_NAMES is a comma-separated list of the object formats 69 * that are supported on the architecture. 70 */ 71 #define OBJFORMAT_NAMES "elf", "aout" 72 #define OBJFORMAT_DEFAULT "elf" 73 74 #define MAXHOSTNAMELEN 64 75 76 #ifdef SMP 77 #define MAXCPU 16 78 #else 79 #define MAXCPU 1 80 #endif /* SMP */ 81 82 #define ALIGNBYTES _ALIGNBYTES 83 #define ALIGN(p) _ALIGN(p) 84 85 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 86 87 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 88 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 89 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 90 #define PDRMASK (NBPDR-1) 91 92 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 93 #define DEV_BSIZE (1<<DEV_BSHIFT) 94 95 #ifndef BLKDEV_IOSIZE 96 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 97 #endif 98 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 99 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 100 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) 101 102 #define IOPAGES 2 /* pages of i/o permission bitmap */ 103 104 #ifndef KSTACK_PAGES 105 #define KSTACK_PAGES 2 /* Includes pcb! */ 106 #endif 107 #define UAREA_PAGES 1 /* holds struct user WITHOUT PCB (see def.) */ 108 109 #define KSTACK_GUARD /* compile in the kstack guard page */ 110 111 /* 112 * Ceiling on amount of swblock kva space. 113 */ 114 #ifndef VM_SWZONE_SIZE_MAX 115 #define VM_SWZONE_SIZE_MAX (70 * 1024 * 1024) 116 #endif 117 118 /* 119 * Ceiling on size of buffer cache (really only effects write queueing, 120 * the VM page cache is not effected). 121 */ 122 #ifndef VM_BCACHE_SIZE_MAX 123 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) 124 #endif 125 126 127 /* 128 * Constants related to network buffer management. 129 * MCLBYTES must be no larger than PAGE_SIZE. 130 */ 131 #ifndef MSIZE 132 #define MSIZE 256 /* size of an mbuf */ 133 #endif /* MSIZE */ 134 135 #ifndef MCLSHIFT 136 #define MCLSHIFT 11 /* convert bytes to mbuf clusters */ 137 #endif /* MCLSHIFT */ 138 #define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 139 140 /* 141 * Some macros for units conversion 142 */ 143 144 /* clicks to bytes */ 145 #define ctob(x) ((x)<<PAGE_SHIFT) 146 147 /* bytes to clicks */ 148 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 149 150 /* 151 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 152 * want to shift an unsigned type to avoid sign extension and we don't 153 * want to widen `bytes' unnecessarily. Assume that the result fits in 154 * a daddr_t. 155 */ 156 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 157 (sizeof (bytes) > sizeof(long) \ 158 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 159 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 160 161 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 162 ((off_t)(db) << DEV_BSHIFT) 163 164 /* 165 * Mach derived conversion macros 166 */ 167 #define trunc_page(x) ((x) & ~PAGE_MASK) 168 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 169 #define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 170 #define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 171 172 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 173 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 174 175 #define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 176 #define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 177 178 #define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 179 180 #endif /* !_MACHINE_PARAM_H_ */ 181