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 * Enable superpage reservations: 1 level. 111 */ 112 #ifndef VM_NRESERVLEVEL 113 #define VM_NRESERVLEVEL 1 114 #endif 115 116 /* 117 * Level 0 reservations consist of 512 pages under PAE and 1024 pages 118 * otherwise. 119 */ 120 #ifndef VM_LEVEL_0_ORDER 121 #ifdef PAE 122 #define VM_LEVEL_0_ORDER 9 123 #else 124 #define VM_LEVEL_0_ORDER 10 125 #endif 126 #endif 127 128 /* 129 * Kernel physical load address. 130 */ 131 #ifndef KERNLOAD 132 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST) 133 #define KERNLOAD 0 134 #else 135 #define KERNLOAD (1 << PDRSHIFT) 136 #endif 137 #endif /* !defined(KERNLOAD) */ 138 139 /* 140 * Virtual addresses of things. Derived from the page directory and 141 * page table indexes from pmap.h for precision. 142 * Because of the page that is both a PD and PT, it looks a little 143 * messy at times, but hey, we'll do anything to save a page :-) 144 */ 145 146 #ifdef XEN 147 #define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START 148 #else 149 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1) 150 #endif 151 152 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 153 154 #define KERNBASE VADDR(KPTDI, 0) 155 156 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 157 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 158 159 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0) 160 161 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 162 #define USRSTACK SHAREDPAGE 163 164 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 165 #define VM_MIN_ADDRESS ((vm_offset_t)0) 166 167 /* virtual sizes (bytes) for various kernel submaps */ 168 #ifndef VM_KMEM_SIZE 169 #define VM_KMEM_SIZE (12 * 1024 * 1024) 170 #endif 171 172 /* 173 * How many physical pages per KVA page allocated. 174 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), 175 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX) 176 * is the total KVA space allocated for kmem_map. 177 */ 178 #ifndef VM_KMEM_SIZE_SCALE 179 #define VM_KMEM_SIZE_SCALE (3) 180 #endif 181 182 /* 183 * Ceiling on the amount of kmem_map KVA space: 40% of the entire KVA space 184 * rounded to the nearest multiple of the superpage size. 185 */ 186 #ifndef VM_KMEM_SIZE_MAX 187 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 188 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 189 #endif 190 191 /* initial pagein size of beginning of executable file */ 192 #ifndef VM_INITIAL_PAGEIN 193 #define VM_INITIAL_PAGEIN 16 194 #endif 195 196 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 197 198 #ifndef VM_MAX_AUTOTUNE_MAXUSERS 199 #define VM_MAX_AUTOTUNE_MAXUSERS 384 200 #endif 201 202 #endif /* _MACHINE_VMPARAM_H_ */ 203