param.h revision 83366
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: head/sys/i386/include/param.h 83366 2001-09-12 08:38:13Z julian $ 38 */ 39 40/* 41 * Machine dependent constants for Intel 386. 42 */ 43 44/* 45 * Round p (pointer or byte index) up to a correctly-aligned value 46 * for all data types (int, long, ...). The result is unsigned int 47 * and must be cast to any desired pointer type. 48 */ 49#ifndef _ALIGNBYTES 50#define _ALIGNBYTES (sizeof(int) - 1) 51#endif 52#ifndef _ALIGN 53#define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES) 54#endif 55 56#ifndef _MACHINE 57#define _MACHINE i386 58#endif 59#ifndef _MACHINE_ARCH 60#define _MACHINE_ARCH i386 61#endif 62 63#ifndef _NO_NAMESPACE_POLLUTION 64 65#ifndef _MACHINE_PARAM_H_ 66#define _MACHINE_PARAM_H_ 67 68#ifndef MACHINE 69#define MACHINE "i386" 70#endif 71#ifndef MACHINE_ARCH 72#define MACHINE_ARCH "i386" 73#endif 74#define MID_MACHINE MID_I386 75 76/* 77 * OBJFORMAT_NAMES is a comma-separated list of the object formats 78 * that are supported on the architecture. 79 */ 80#define OBJFORMAT_NAMES "elf", "aout" 81#define OBJFORMAT_DEFAULT "elf" 82 83#ifdef SMP 84#define MAXCPU 16 85#else 86#define MAXCPU 1 87#endif /* SMP */ 88 89#define ALIGNBYTES _ALIGNBYTES 90#define ALIGN(p) _ALIGN(p) 91 92#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 93#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 94#define PAGE_MASK (PAGE_SIZE-1) 95#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 96 97#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 98#define PDRSHIFT 22 /* LOG2(NBPDR) */ 99#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 100#define PDRMASK (NBPDR-1) 101 102#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 103#define DEV_BSIZE (1<<DEV_BSHIFT) 104 105#ifndef BLKDEV_IOSIZE 106#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 107#endif 108#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 109#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 110#define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) 111 112#define IOPAGES 2 /* pages of i/o permission bitmap */ 113 114#ifndef KSTACK_PAGES 115#define KSTACK_PAGES 2 /* Includes pcb! */ 116#endif 117#define UAREA_PAGES 1 /* holds struct user WITHOUT PCB (see def.) */ 118 119#define KSTACK_GUARD /* compile in the kstack guard page */ 120 121/* 122 * Ceiling on amount of swblock kva space. 123 */ 124#ifndef VM_SWZONE_SIZE_MAX 125#define VM_SWZONE_SIZE_MAX (70 * 1024 * 1024) 126#endif 127 128/* 129 * Ceiling on size of buffer cache (really only effects write queueing, 130 * the VM page cache is not effected). 131 */ 132#ifndef VM_BCACHE_SIZE_MAX 133#define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) 134#endif 135 136 137/* 138 * Constants related to network buffer management. 139 * MCLBYTES must be no larger than PAGE_SIZE. 140 */ 141#ifndef MSIZE 142#define MSIZE 256 /* size of an mbuf */ 143#endif /* MSIZE */ 144 145#ifndef MCLSHIFT 146#define MCLSHIFT 11 /* convert bytes to mbuf clusters */ 147#endif /* MCLSHIFT */ 148#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 149 150/* 151 * Some macros for units conversion 152 */ 153 154/* clicks to bytes */ 155#define ctob(x) ((x)<<PAGE_SHIFT) 156 157/* bytes to clicks */ 158#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 159 160/* 161 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 162 * want to shift an unsigned type to avoid sign extension and we don't 163 * want to widen `bytes' unnecessarily. Assume that the result fits in 164 * a daddr_t. 165 */ 166#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 167 (sizeof (bytes) > sizeof(long) \ 168 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 169 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 170 171#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 172 ((off_t)(db) << DEV_BSHIFT) 173 174/* 175 * Mach derived conversion macros 176 */ 177#define trunc_page(x) ((x) & ~PAGE_MASK) 178#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 179#define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 180#define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 181 182#define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 183#define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 184 185#define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 186#define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 187 188#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 189 190#endif /* !_MACHINE_PARAM_H_ */ 191#endif /* !_NO_NAMESPACE_POLLUTION */ 192