vmparam.h revision 282065
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * Copyright (c) 1994 John S. Dyson 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 35 * $FreeBSD: stable/10/sys/i386/include/vmparam.h 282065 2015-04-27 08:02:12Z kib $ 36 */ 37 38 39#ifndef _MACHINE_VMPARAM_H_ 40#define _MACHINE_VMPARAM_H_ 1 41 42/* 43 * Machine dependent constants for 386. 44 */ 45 46/* 47 * Virtual memory related constants, all in bytes 48 */ 49#define MAXTSIZ (128UL*1024*1024) /* max text size */ 50#ifndef DFLDSIZ 51#define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ 52#endif 53#ifndef MAXDSIZ 54#define MAXDSIZ (512UL*1024*1024) /* max data size */ 55#endif 56#ifndef DFLSSIZ 57#define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 58#endif 59#ifndef MAXSSIZ 60#define MAXSSIZ (64UL*1024*1024) /* max stack size */ 61#endif 62#ifndef SGROWSIZ 63#define SGROWSIZ (128UL*1024) /* amount to grow stack */ 64#endif 65 66/* 67 * Choose between DENSE and SPARSE based on whether lower execution time or 68 * lower kernel address space consumption is desired. Under PAE, kernel 69 * address space is often in short supply. 70 */ 71#ifdef PAE 72#define VM_PHYSSEG_SPARSE 73#else 74#define VM_PHYSSEG_DENSE 75#endif 76 77/* 78 * The number of PHYSSEG entries must be one greater than the number 79 * of phys_avail entries because the phys_avail entry that spans the 80 * largest physical address that is accessible by ISA DMA is split 81 * into two PHYSSEG entries. 82 */ 83#define VM_PHYSSEG_MAX 17 84 85/* 86 * Create two free page pools. Since the i386 kernel virtual address 87 * space does not include a mapping onto the machine's entire physical 88 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 89 * pool, VM_FREEPOOL_DEFAULT. 90 */ 91#define VM_NFREEPOOL 2 92#define VM_FREEPOOL_CACHE 1 93#define VM_FREEPOOL_DEFAULT 0 94#define VM_FREEPOOL_DIRECT 0 95 96/* 97 * Create two free page lists: VM_FREELIST_DEFAULT is for physical 98 * pages that are above the largest physical address that is 99 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 100 * that are below that address. 101 */ 102#define VM_NFREELIST 2 103#define VM_FREELIST_DEFAULT 0 104#define VM_FREELIST_ISADMA 1 105 106/* 107 * The largest allocation size is 2MB under PAE and 4MB otherwise. 108 */ 109#ifdef PAE 110#define VM_NFREEORDER 10 111#else 112#define VM_NFREEORDER 11 113#endif 114 115/* 116 * Enable superpage reservations: 1 level. 117 */ 118#ifndef VM_NRESERVLEVEL 119#define VM_NRESERVLEVEL 1 120#endif 121 122/* 123 * Level 0 reservations consist of 512 pages when PAE pagetables are 124 * used, and 1024 pages otherwise. 125 */ 126#ifndef VM_LEVEL_0_ORDER 127#if defined(PAE) || defined(PAE_TABLES) 128#define VM_LEVEL_0_ORDER 9 129#else 130#define VM_LEVEL_0_ORDER 10 131#endif 132#endif 133 134/* 135 * Kernel physical load address. 136 */ 137#ifndef KERNLOAD 138#if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST) 139#define KERNLOAD 0 140#else 141#define KERNLOAD (1 << PDRSHIFT) 142#endif 143#endif /* !defined(KERNLOAD) */ 144 145/* 146 * Virtual addresses of things. Derived from the page directory and 147 * page table indexes from pmap.h for precision. 148 * Because of the page that is both a PD and PT, it looks a little 149 * messy at times, but hey, we'll do anything to save a page :-) 150 */ 151 152#ifdef XEN 153#define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START 154#else 155#define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1) 156#endif 157 158#define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 159 160#define KERNBASE VADDR(KPTDI, 0) 161 162#define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 163#define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 164 165#define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0) 166 167#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 168#define USRSTACK SHAREDPAGE 169 170#define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 171#define VM_MIN_ADDRESS ((vm_offset_t)0) 172 173/* 174 * How many physical pages per kmem arena virtual page. 175 */ 176#ifndef VM_KMEM_SIZE_SCALE 177#define VM_KMEM_SIZE_SCALE (3) 178#endif 179 180/* 181 * Optional floor (in bytes) on the size of the kmem arena. 182 */ 183#ifndef VM_KMEM_SIZE_MIN 184#define VM_KMEM_SIZE_MIN (12 * 1024 * 1024) 185#endif 186 187/* 188 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the 189 * kernel map rounded to the nearest multiple of the superpage size. 190 */ 191#ifndef VM_KMEM_SIZE_MAX 192#define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 193 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 194#endif 195 196/* initial pagein size of beginning of executable file */ 197#ifndef VM_INITIAL_PAGEIN 198#define VM_INITIAL_PAGEIN 16 199#endif 200 201#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 202 203#ifndef VM_MAX_AUTOTUNE_MAXUSERS 204#define VM_MAX_AUTOTUNE_MAXUSERS 384 205#endif 206 207#endif /* _MACHINE_VMPARAM_H_ */ 208