param.h revision 96606
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 96606 2002-05-14 20:35:29Z phk $ 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 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 * Mach derived conversion macros 128 */ 129#define trunc_page(x) ((x) & ~PAGE_MASK) 130#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 131#define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 132#define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 133 134#define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 135#define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 136 137#define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 138#define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 139 140#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 141 142#endif /* !_MACHINE_PARAM_H_ */ 143#endif /* !_NO_NAMESPACE_POLLUTION */ 144