param.h revision 112841
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 112841 2003-03-30 05:24:52Z jake $ 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#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 PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 86#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 87#define PAGE_MASK (PAGE_SIZE-1) 88#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 89 90#ifdef PAE 91#define NPGPTD 4 92#define PDRSHIFT 21 /* LOG2(NBPDR) */ 93#else 94#define NPGPTD 1 95#define PDRSHIFT 22 /* LOG2(NBPDR) */ 96#endif 97 98#define NBPTD (NPGPTD<<PAGE_SHIFT) 99#define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 100#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 101#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 102#define PDRMASK (NBPDR-1) 103 104#define IOPAGES 2 /* pages of i/o permission bitmap */ 105 106#ifndef KSTACK_PAGES 107#define KSTACK_PAGES 2 /* Includes pcb! */ 108#endif 109#define UAREA_PAGES 1 /* holds struct user WITHOUT PCB (see def.) */ 110 111#define KSTACK_GUARD /* compile in the kstack guard page */ 112 113/* 114 * Ceiling on amount of swblock kva space, can be changed via 115 * the kern.maxswzone /boot/loader.conf variable. 116 */ 117#ifndef VM_SWZONE_SIZE_MAX 118#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024) 119#endif 120 121/* 122 * Ceiling on size of buffer cache (really only effects write queueing, 123 * the VM page cache is not effected), can be changed via 124 * the kern.maxbcache /boot/loader.conf variable. 125 */ 126#ifndef VM_BCACHE_SIZE_MAX 127#define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) 128#endif 129 130/* 131 * Mach derived conversion macros 132 */ 133#define trunc_page(x) ((x) & ~PAGE_MASK) 134#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 135#define trunc_4mpage(x) ((x) & ~PDRMASK) 136#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 137 138#define atop(x) ((x) >> PAGE_SHIFT) 139#define ptoa(x) ((x) << PAGE_SHIFT) 140 141#define i386_btop(x) ((x) >> PAGE_SHIFT) 142#define i386_ptob(x) ((x) << PAGE_SHIFT) 143 144#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 145 146#endif /* !_MACHINE_PARAM_H_ */ 147#endif /* !_NO_NAMESPACE_POLLUTION */ 148