param.h revision 134598
178344Sobrien/*- 278344Sobrien * Copyright (c) 1990 The Regents of the University of California. 398184Sgordon * All rights reserved. 498184Sgordon * 578344Sobrien * This code is derived from software contributed to Berkeley by 678344Sobrien * William Jolitz. 778344Sobrien * 878344Sobrien * Redistribution and use in source and binary forms, with or without 998184Sgordon * modification, are permitted provided that the following conditions 1098184Sgordon * are met: 1198184Sgordon * 1. Redistributions of source code must retain the above copyright 1278344Sobrien * notice, this list of conditions and the following disclaimer. 1398184Sgordon * 2. Redistributions in binary form must reproduce the above copyright 1498184Sgordon * notice, this list of conditions and the following disclaimer in the 1598184Sgordon * documentation and/or other materials provided with the distribution. 1678344Sobrien * 4. Neither the name of the University nor the names of its contributors 1778344Sobrien * may be used to endorse or promote products derived from this software 1878344Sobrien * without specific prior written permission. 1998184Sgordon * 2078344Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2178344Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22102864Sgordon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23102864Sgordon * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24102864Sgordon * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25102864Sgordon * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26102864Sgordon * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27102864Sgordon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28102864Sgordon * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29102864Sgordon * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30102864Sgordon * SUCH DAMAGE. 31102864Sgordon * 32102864Sgordon * from: @(#)param.h 5.8 (Berkeley) 6/28/91 33102864Sgordon * $FreeBSD: head/sys/i386/include/param.h 134598 2004-09-01 09:01:32Z julian $ 34102864Sgordon */ 35102864Sgordon 36102864Sgordon/* 37102864Sgordon * Machine dependent constants for Intel 386. 38102864Sgordon */ 39102864Sgordon 40102864Sgordon/* 41102864Sgordon * Round p (pointer or byte index) up to a correctly-aligned value 42102864Sgordon * for all data types (int, long, ...). The result is unsigned int 43102864Sgordon * and must be cast to any desired pointer type. 44102864Sgordon */ 45102864Sgordon#ifndef _ALIGNBYTES 46102864Sgordon#define _ALIGNBYTES (sizeof(int) - 1) 4778344Sobrien#endif 4878344Sobrien#ifndef _ALIGN 4978344Sobrien#define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES) 5078344Sobrien#endif 5178344Sobrien 5298184Sgordon#ifndef _MACHINE 5378344Sobrien#define _MACHINE i386 5478344Sobrien#endif 5578344Sobrien#ifndef _MACHINE_ARCH 5678344Sobrien#define _MACHINE_ARCH i386 5778344Sobrien#endif 5878344Sobrien 5978344Sobrien#ifndef _NO_NAMESPACE_POLLUTION 6078344Sobrien 6178344Sobrien#ifndef _MACHINE_PARAM_H_ 6278344Sobrien#define _MACHINE_PARAM_H_ 6378344Sobrien 6478344Sobrien#ifndef MACHINE 6578344Sobrien#define MACHINE "i386" 6678344Sobrien#endif 6778344Sobrien#ifndef MACHINE_ARCH 6878344Sobrien#define MACHINE_ARCH "i386" 6978344Sobrien#endif 7078344Sobrien#define MID_MACHINE MID_I386 7178344Sobrien 7278344Sobrien#ifdef SMP 7378344Sobrien#define MAXCPU 16 7478344Sobrien#else 7598184Sgordon#define MAXCPU 1 7698184Sgordon#endif /* SMP */ 7778344Sobrien 7878344Sobrien#define ALIGNBYTES _ALIGNBYTES 7978344Sobrien#define ALIGN(p) _ALIGN(p) 8078344Sobrien 8178344Sobrien#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 8278344Sobrien#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 8378344Sobrien#define PAGE_MASK (PAGE_SIZE-1) 8478344Sobrien#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 8598184Sgordon 8698184Sgordon#ifdef PAE 8798184Sgordon#define NPGPTD 4 88102864Sgordon#define PDRSHIFT 21 /* LOG2(NBPDR) */ 89102864Sgordon#else 90102864Sgordon#define NPGPTD 1 91102864Sgordon#define PDRSHIFT 22 /* LOG2(NBPDR) */ 92102864Sgordon#endif 93102864Sgordon 94102864Sgordon#define NBPTD (NPGPTD<<PAGE_SHIFT) 95102864Sgordon#define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 96102864Sgordon#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 97102864Sgordon#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 9898184Sgordon#define PDRMASK (NBPDR-1) 9998184Sgordon 10098184Sgordon/* PREEMPTION exposes scheduler bugs that need to be fixed. */ 101102864Sgordon#include "opt_sched.h" 102102864Sgordon#ifdef SCHED_4BSD 103102864Sgordon#define PREEMPTION 104102864Sgordon#endif 105102864Sgordon 106102864Sgordon#define IOPAGES 2 /* pages of i/o permission bitmap */ 10798184Sgordon 10898184Sgordon#ifndef KSTACK_PAGES 10998184Sgordon#define KSTACK_PAGES 2 /* Includes pcb! */ 110102864Sgordon#endif 111102864Sgordon#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 11298184Sgordon#define UAREA_PAGES 1 /* holds struct user WITHOUT PCB (see def.) */ 11398184Sgordon 11498184Sgordon/* 11598184Sgordon * Ceiling on amount of swblock kva space, can be changed via 116 * the kern.maxswzone /boot/loader.conf variable. 117 */ 118#ifndef VM_SWZONE_SIZE_MAX 119#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024) 120#endif 121 122/* 123 * Ceiling on size of buffer cache (really only effects write queueing, 124 * the VM page cache is not effected), can be changed via 125 * the kern.maxbcache /boot/loader.conf variable. 126 */ 127#ifndef VM_BCACHE_SIZE_MAX 128#define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) 129#endif 130 131/* 132 * Mach derived conversion macros 133 */ 134#define trunc_page(x) ((x) & ~PAGE_MASK) 135#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 136#define trunc_4mpage(x) ((x) & ~PDRMASK) 137#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 138 139#define atop(x) ((x) >> PAGE_SHIFT) 140#define ptoa(x) ((x) << PAGE_SHIFT) 141 142#define i386_btop(x) ((x) >> PAGE_SHIFT) 143#define i386_ptob(x) ((x) << PAGE_SHIFT) 144 145#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 146 147#endif /* !_MACHINE_PARAM_H_ */ 148#endif /* !_NO_NAMESPACE_POLLUTION */ 149