param.h revision 248789
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 248789 2013-03-27 10:52:18Z kib $ 34 */ 35 36#include <machine/_align.h> 37 38#ifndef _I386_INCLUDE_PARAM_H_ 39#define _I386_INCLUDE_PARAM_H_ 40 41/* 42 * Machine dependent constants for Intel 386. 43 */ 44 45/* 46 * Round p (pointer or byte index) up to a correctly-aligned value 47 * for all data types (int, long, ...). The result is unsigned int 48 * and must be cast to any desired pointer type. 49 */ 50#ifndef _ALIGNBYTES 51#define _ALIGNBYTES (sizeof(int) - 1) 52#endif 53#ifndef _ALIGN 54#define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES) 55#endif 56 57 58#define __HAVE_ACPI 59#define __HAVE_PIR 60#define __PCI_REROUTE_INTERRUPT 61 62#ifndef MACHINE 63#define MACHINE "i386" 64#endif 65#ifndef MACHINE_ARCH 66#define MACHINE_ARCH "i386" 67#endif 68#define MID_MACHINE MID_I386 69 70#if defined(SMP) || defined(KLD_MODULE) 71#ifndef MAXCPU 72#define MAXCPU 32 73#endif 74#else 75#define MAXCPU 1 76#endif /* SMP || KLD_MODULE */ 77 78#define ALIGNBYTES _ALIGNBYTES 79#define ALIGN(p) _ALIGN(p) 80/* 81 * ALIGNED_POINTER is a boolean macro that checks whether an address 82 * is valid to fetch data elements of type t from on this architecture. 83 * This does not reflect the optimal alignment, just the possibility 84 * (within reasonable limits). 85 */ 86#define ALIGNED_POINTER(p, t) 1 87 88/* 89 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an 90 * architecture. It should be used with appropriate caution. 91 */ 92#define CACHE_LINE_SHIFT 7 93#define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT) 94 95#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 96#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 97#define PAGE_MASK (PAGE_SIZE-1) 98#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 99 100#ifdef PAE 101#define NPGPTD 4 102#define PDRSHIFT 21 /* LOG2(NBPDR) */ 103#define NPGPTD_SHIFT 9 104#else 105#define NPGPTD 1 106#define PDRSHIFT 22 /* LOG2(NBPDR) */ 107#define NPGPTD_SHIFT 10 108#endif 109 110#define NBPTD (NPGPTD<<PAGE_SHIFT) 111#define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 112#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 113#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 114#define PDRMASK (NBPDR-1) 115 116#define MAXPAGESIZES 2 /* maximum number of supported page sizes */ 117 118#define IOPAGES 2 /* pages of i/o permission bitmap */ 119 120#ifndef KSTACK_PAGES 121#define KSTACK_PAGES 2 /* Includes pcb! */ 122#endif 123#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 124 125/* 126 * Ceiling on amount of swblock kva space, can be changed via 127 * the kern.maxswzone /boot/loader.conf variable. 128 * 129 * 276 is sizeof(struct swblock), but we do not always have a definition 130 * in scope for struct swblock, so we have to hardcode it. Each struct 131 * swblock holds metadata for 32 pages, so in theory, this is enough for 132 * 16 GB of swap. In practice, however, the usable amount is considerably 133 * lower due to fragmentation. 134 */ 135#ifndef VM_SWZONE_SIZE_MAX 136#define VM_SWZONE_SIZE_MAX (276 * 128 * 1024) 137#endif 138 139/* 140 * Ceiling on size of buffer cache (really only effects write queueing, 141 * the VM page cache is not effected), can be changed via 142 * the kern.maxbcache /boot/loader.conf variable. 143 * 144 * The value is equal to the size of the auto-tuned buffer map for 145 * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc(). 146 */ 147#ifndef VM_BCACHE_SIZE_MAX 148#define VM_BCACHE_SIZE_MAX (7224 * 16 * 1024) 149#endif 150 151/* 152 * Mach derived conversion macros 153 */ 154#define trunc_page(x) ((x) & ~PAGE_MASK) 155#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 156#define trunc_4mpage(x) ((x) & ~PDRMASK) 157#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 158 159#define atop(x) ((x) >> PAGE_SHIFT) 160#define ptoa(x) ((x) << PAGE_SHIFT) 161 162#define i386_btop(x) ((x) >> PAGE_SHIFT) 163#define i386_ptob(x) ((x) << PAGE_SHIFT) 164 165#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 166 167#endif /* !_I386_INCLUDE_PARAM_H_ */ 168