param.h revision 153168
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 153168 2005-12-06 13:27:21Z ru $ 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 _NO_NAMESPACE_POLLUTION 53 54#ifndef _MACHINE_PARAM_H_ 55#define _MACHINE_PARAM_H_ 56 57#ifndef MACHINE 58#define MACHINE "i386" 59#endif 60#ifndef MACHINE_ARCH 61#define MACHINE_ARCH "i386" 62#endif 63#define MID_MACHINE MID_I386 64 65#ifdef SMP 66#define MAXCPU 16 67#else 68#define MAXCPU 1 69#endif /* SMP */ 70 71#define ALIGNBYTES _ALIGNBYTES 72#define ALIGN(p) _ALIGN(p) 73 74#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 75#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 76#define PAGE_MASK (PAGE_SIZE-1) 77#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 78 79#ifdef PAE 80#define NPGPTD 4 81#define PDRSHIFT 21 /* LOG2(NBPDR) */ 82#else 83#define NPGPTD 1 84#define PDRSHIFT 22 /* LOG2(NBPDR) */ 85#endif 86 87#define NBPTD (NPGPTD<<PAGE_SHIFT) 88#define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 89#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 90#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 91#define PDRMASK (NBPDR-1) 92 93#define IOPAGES 2 /* pages of i/o permission bitmap */ 94 95#ifndef KSTACK_PAGES 96#define KSTACK_PAGES 2 /* Includes pcb! */ 97#endif 98#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 99 100/* 101 * Ceiling on amount of swblock kva space, can be changed via 102 * the kern.maxswzone /boot/loader.conf variable. 103 */ 104#ifndef VM_SWZONE_SIZE_MAX 105#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024) 106#endif 107 108/* 109 * Ceiling on size of buffer cache (really only effects write queueing, 110 * the VM page cache is not effected), can be changed via 111 * the kern.maxbcache /boot/loader.conf variable. 112 */ 113#ifndef VM_BCACHE_SIZE_MAX 114#define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) 115#endif 116 117/* 118 * Mach derived conversion macros 119 */ 120#define trunc_page(x) ((x) & ~PAGE_MASK) 121#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 122#define trunc_4mpage(x) ((x) & ~PDRMASK) 123#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 124 125#define atop(x) ((x) >> PAGE_SHIFT) 126#define ptoa(x) ((x) << PAGE_SHIFT) 127 128#define i386_btop(x) ((x) >> PAGE_SHIFT) 129#define i386_ptob(x) ((x) << PAGE_SHIFT) 130 131#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 132 133#endif /* !_MACHINE_PARAM_H_ */ 134#endif /* !_NO_NAMESPACE_POLLUTION */ 135