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 * $FreeBSD$ 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 * The physical address space is densely populated. 68 */ 69#define VM_PHYSSEG_DENSE 70 71/* 72 * The number of PHYSSEG entries must be one greater than the number 73 * of phys_avail entries because the phys_avail entry that spans the 74 * largest physical address that is accessible by ISA DMA is split 75 * into two PHYSSEG entries. 76 */ 77#define VM_PHYSSEG_MAX 17 78 79/* 80 * Create two free page pools. Since the i386 kernel virtual address 81 * space does not include a mapping onto the machine's entire physical 82 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 83 * pool, VM_FREEPOOL_DEFAULT. 84 */ 85#define VM_NFREEPOOL 2 86#define VM_FREEPOOL_CACHE 1 87#define VM_FREEPOOL_DEFAULT 0 88#define VM_FREEPOOL_DIRECT 0 89 90/* 91 * Create two free page lists: VM_FREELIST_DEFAULT is for physical 92 * pages that are above the largest physical address that is 93 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 94 * that are below that address. 95 */ 96#define VM_NFREELIST 2 97#define VM_FREELIST_DEFAULT 0 98#define VM_FREELIST_ISADMA 1 99 100/* 101 * The largest allocation size is 2MB under PAE and 4MB otherwise. 102 */ 103#ifdef PAE 104#define VM_NFREEORDER 10 105#else 106#define VM_NFREEORDER 11 107#endif 108 109/* 110 * Only one memory domain. 111 */ 112#ifndef VM_NDOMAIN 113#define VM_NDOMAIN 1 114#endif 115 116/* 117 * Enable superpage reservations: 1 level. 118 */ 119#ifndef VM_NRESERVLEVEL 120#define VM_NRESERVLEVEL 1 121#endif 122 123/* 124 * Level 0 reservations consist of 512 pages under PAE and 1024 pages 125 * otherwise. 126 */ 127#ifndef VM_LEVEL_0_ORDER 128#ifdef PAE 129#define VM_LEVEL_0_ORDER 9 130#else 131#define VM_LEVEL_0_ORDER 10 132#endif 133#endif 134 135/* 136 * Kernel physical load address. 137 */ 138#ifndef KERNLOAD 139#if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST) 140#define KERNLOAD 0 141#else 142#define KERNLOAD (1 << PDRSHIFT) 143#endif 144#endif /* !defined(KERNLOAD) */ 145 146/* 147 * Virtual addresses of things. Derived from the page directory and 148 * page table indexes from pmap.h for precision. 149 * Because of the page that is both a PD and PT, it looks a little 150 * messy at times, but hey, we'll do anything to save a page :-) 151 */ 152 153#ifdef XEN 154#define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START 155#else 156#define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1) 157#endif 158 159#define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 160 161#define KERNBASE VADDR(KPTDI, 0) 162 163#define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 164#define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 165 166#define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0) 167 168#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 169#define USRSTACK SHAREDPAGE 170 171#define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 172#define VM_MIN_ADDRESS ((vm_offset_t)0) 173 174/* virtual sizes (bytes) for various kernel submaps */ 175#ifndef VM_KMEM_SIZE 176#define VM_KMEM_SIZE (12 * 1024 * 1024) 177#endif 178 179/* 180 * How many physical pages per KVA page allocated. 181 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), 182 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX) 183 * is the total KVA space allocated for kmem_map. 184 */ 185#ifndef VM_KMEM_SIZE_SCALE 186#define VM_KMEM_SIZE_SCALE (3) 187#endif 188 189/* 190 * Ceiling on the amount of kmem_map KVA space: 40% of the entire KVA space 191 * rounded to the nearest multiple of the superpage size. 192 */ 193#ifndef VM_KMEM_SIZE_MAX 194#define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 195 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 196#endif 197 198/* initial pagein size of beginning of executable file */ 199#ifndef VM_INITIAL_PAGEIN 200#define VM_INITIAL_PAGEIN 16 201#endif 202 203#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 204 205#ifndef VM_MAX_AUTOTUNE_MAXUSERS 206#define VM_MAX_AUTOTUNE_MAXUSERS 384 207#endif 208 209#endif /* _MACHINE_VMPARAM_H_ */ 210