1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * Copyright (c) 1994 John S. Dyson 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * William Jolitz. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 37 * $FreeBSD$ 38 */ 39 40 41 #ifndef _MACHINE_VMPARAM_H_ 42 #define _MACHINE_VMPARAM_H_ 1 43 44 /* 45 * Machine dependent constants for 386. 46 */ 47 48 /* 49 * Virtual memory related constants, all in bytes 50 */ 51 #define MAXTSIZ (128UL*1024*1024) /* max text size */ 52 #ifndef DFLDSIZ 53 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ 54 #endif 55 #ifndef MAXDSIZ 56 #define MAXDSIZ (512UL*1024*1024) /* max data size */ 57 #endif 58 #ifndef DFLSSIZ 59 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 60 #endif 61 #ifndef MAXSSIZ 62 #define MAXSSIZ (64UL*1024*1024) /* max stack size */ 63 #endif 64 #ifndef SGROWSIZ 65 #define SGROWSIZ (128UL*1024) /* amount to grow stack */ 66 #endif 67 68 /* 69 * Choose between DENSE and SPARSE based on whether lower execution time or 70 * lower kernel address space consumption is desired. Under PAE, kernel 71 * address space is often in short supply. 72 */ 73 #ifdef PAE 74 #define VM_PHYSSEG_SPARSE 75 #else 76 #define VM_PHYSSEG_DENSE 77 #endif 78 79 /* 80 * The number of PHYSSEG entries must be one greater than the number 81 * of phys_avail entries because the phys_avail entry that spans the 82 * largest physical address that is accessible by ISA DMA is split 83 * into two PHYSSEG entries. 84 */ 85 #define VM_PHYSSEG_MAX 17 86 87 /* 88 * Create one free page pool. Since the i386 kernel virtual address 89 * space does not include a mapping onto the machine's entire physical 90 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 91 * pool, VM_FREEPOOL_DEFAULT. 92 */ 93 #define VM_NFREEPOOL 1 94 #define VM_FREEPOOL_DEFAULT 0 95 #define VM_FREEPOOL_DIRECT 0 96 97 /* 98 * Create two free page lists: VM_FREELIST_DEFAULT is for physical 99 * pages that are above the largest physical address that is 100 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 101 * that are below that address. 102 */ 103 #define VM_NFREELIST 2 104 #define VM_FREELIST_DEFAULT 0 105 #define VM_FREELIST_ISADMA 1 106 107 /* 108 * The largest allocation size is 2MB under PAE and 4MB otherwise. 109 */ 110 #ifdef PAE 111 #define VM_NFREEORDER 10 112 #else 113 #define VM_NFREEORDER 11 114 #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 when PAE pagetables are 125 * used, and 1024 pages otherwise. 126 */ 127 #ifndef VM_LEVEL_0_ORDER 128 #if defined(PAE) || defined(PAE_TABLES) 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 #define KERNLOAD (KERNPTDI << PDRSHIFT) 140 #endif /* !defined(KERNLOAD) */ 141 142 /* 143 * Virtual addresses of things. Derived from the page directory and 144 * page table indexes from pmap.h for precision. 145 * Because of the page that is both a PD and PT, it looks a little 146 * messy at times, but hey, we'll do anything to save a page :-) 147 */ 148 149 #define VM_MAX_KERNEL_ADDRESS VADDR(PTDPTDI, 0) 150 151 #define VM_MIN_KERNEL_ADDRESS 0 152 153 #define KERNBASE KERNLOAD 154 155 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 156 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 157 158 #define VM_MAXUSER_ADDRESS VADDR(TRPTDI, 0) 159 160 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 161 #define USRSTACK SHAREDPAGE 162 163 #define VM_MAX_ADDRESS VADDR(PTDPTDI, 0) 164 #define VM_MIN_ADDRESS ((vm_offset_t)0) 165 166 #define PMAP_TRM_MIN_ADDRESS VM_MAXUSER_ADDRESS 167 #define PMAP_TRM_MAX_ADDRESS 0xffffffff 168 169 #define PMAP_MAP_LOW VADDR(LOWPTDI, 0) 170 171 /* 172 * KVA layout. The unit of the system allocation is single PDE, which 173 * represents NBPDR bytes, aligned to NBPDR. NBPDR is 4M for non-PAE 174 * page tables, and 2M for PAE. Addresses below are shown for non-PAE. 175 * 176 * 0x00000000 - 0x003fffff Transient identity map of low memory (0-4M), 177 * normally disabled to catch NULL derefs. 178 * 0x00400000 - 0x007fffff Fixed mapping of the low memory (0-4M). 179 * 0x00800000 - 0xffbfffff KERNBASE (VA) == KERNLOAD (PA), kernel 180 * text + data and all kernel maps. Managed 181 * by MI VM. 182 * 0xffc00000 - 0xffdfffff Recursive kernel page table mapping, pointed 183 * to by PTmap. PTD[] recusively points 184 * into PTmap. 185 * 0xffe00000 - 0xffffffff Kernel/User mode shared PDE, contains GDT, 186 * IDT, TSS, LDT, trampoline code and stacks. 187 * Managed by pmap_trm_alloc(). 188 */ 189 190 /* 191 * How many physical pages per kmem arena virtual page. 192 */ 193 #ifndef VM_KMEM_SIZE_SCALE 194 #define VM_KMEM_SIZE_SCALE (3) 195 #endif 196 197 /* 198 * Optional floor (in bytes) on the size of the kmem arena. 199 */ 200 #ifndef VM_KMEM_SIZE_MIN 201 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024) 202 #endif 203 204 /* 205 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the 206 * kernel map rounded to the nearest multiple of the superpage size. 207 */ 208 #ifndef VM_KMEM_SIZE_MAX 209 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 210 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 211 #endif 212 213 /* initial pagein size of beginning of executable file */ 214 #ifndef VM_INITIAL_PAGEIN 215 #define VM_INITIAL_PAGEIN 16 216 #endif 217 218 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 219 220 #ifndef VM_MAX_AUTOTUNE_MAXUSERS 221 #define VM_MAX_AUTOTUNE_MAXUSERS 384 222 #endif 223 224 #define SFBUF 225 #define SFBUF_MAP 226 #define SFBUF_CPUSET 227 #define SFBUF_PROCESS_PAGE 228 229 #define PMAP_HAS_DMAP 0 230 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; }) 231 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; }) 232 233 #endif /* _MACHINE_VMPARAM_H_ */ 234