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 USRSTACK VM_MAXUSER_ADDRESS 169 170 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 171 #define VM_MIN_ADDRESS ((vm_offset_t)0) 172 173 /* virtual sizes (bytes) for various kernel submaps */ 174 #ifndef VM_KMEM_SIZE 175 #define VM_KMEM_SIZE (12 * 1024 * 1024) 176 #endif 177 178 /* 179 * How many physical pages per KVA page allocated. 180 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), 181 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX) 182 * is the total KVA space allocated for kmem_map. 183 */ 184 #ifndef VM_KMEM_SIZE_SCALE 185 #define VM_KMEM_SIZE_SCALE (3) 186 #endif 187 188 /* 189 * Ceiling on amount of kmem_map kva space. 190 */ 191 #ifndef VM_KMEM_SIZE_MAX 192 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \ 193 VM_MIN_KERNEL_ADDRESS) * 2 / 5) 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 #endif /* _MACHINE_VMPARAM_H_ */ 204