param.h revision 132961
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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)param.h 5.8 (Berkeley) 6/28/91 33 * $FreeBSD: head/sys/i386/include/param.h 132961 2004-08-01 14:31:45Z scottl $ 34 */ 35 36/* 37 * Machine dependent constants for Intel 386. 38 */ 39 40/* 41 * Round p (pointer or byte index) up to a correctly-aligned value 42 * for all data types (int, long, ...). The result is unsigned int 43 * and must be cast to any desired pointer type. 44 */ 45#ifndef _ALIGNBYTES 46#define _ALIGNBYTES (sizeof(int) - 1) 47#endif 48#ifndef _ALIGN 49#define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES) 50#endif 51 52#ifndef _MACHINE 53#define _MACHINE i386 54#endif 55#ifndef _MACHINE_ARCH 56#define _MACHINE_ARCH i386 57#endif 58 59#ifndef _NO_NAMESPACE_POLLUTION 60 61#ifndef _MACHINE_PARAM_H_ 62#define _MACHINE_PARAM_H_ 63 64#ifndef MACHINE 65#define MACHINE "i386" 66#endif 67#ifndef MACHINE_ARCH 68#define MACHINE_ARCH "i386" 69#endif 70#define MID_MACHINE MID_I386 71 72#ifdef SMP 73#define MAXCPU 16 74#else 75#define MAXCPU 1 76#endif /* SMP */ 77 78#define ALIGNBYTES _ALIGNBYTES 79#define ALIGN(p) _ALIGN(p) 80 81#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 82#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 83#define PAGE_MASK (PAGE_SIZE-1) 84#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 85 86#ifdef PAE 87#define NPGPTD 4 88#define PDRSHIFT 21 /* LOG2(NBPDR) */ 89#else 90#define NPGPTD 1 91#define PDRSHIFT 22 /* LOG2(NBPDR) */ 92#endif 93 94#define NBPTD (NPGPTD<<PAGE_SHIFT) 95#define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 96#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 97#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 98#define PDRMASK (NBPDR-1) 99 100/* PREEMPTION exposes scheduler bugs that need to be fixed. */ 101#if 0 102#define PREEMPTION 103#endif 104 105#define IOPAGES 2 /* pages of i/o permission bitmap */ 106 107#ifndef KSTACK_PAGES 108#define KSTACK_PAGES 2 /* Includes pcb! */ 109#endif 110#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 111#define UAREA_PAGES 1 /* holds struct user WITHOUT PCB (see def.) */ 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