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 #ifndef _MACHINE_VMPARAM_H_ 41 #define _MACHINE_VMPARAM_H_ 1 42 43 /* 44 * Machine dependent constants for 386. 45 */ 46 47 /* 48 * Virtual memory related constants, all in bytes 49 */ 50 #define MAXTSIZ (128UL*1024*1024) /* max text size */ 51 #ifndef DFLDSIZ 52 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ 53 #endif 54 #ifndef MAXDSIZ 55 #define MAXDSIZ (512UL*1024*1024) /* max data size */ 56 #endif 57 #ifndef DFLSSIZ 58 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 59 #endif 60 #ifndef MAXSSIZ 61 #define MAXSSIZ (64UL*1024*1024) /* max stack size */ 62 #endif 63 #ifndef SGROWSIZ 64 #define SGROWSIZ (128UL*1024) /* amount to grow stack */ 65 #endif 66 67 /* 68 * Choose between DENSE and SPARSE based on whether lower execution time or 69 * lower kernel address space consumption is desired. Under PAE, kernel 70 * address space is often in short supply. 71 */ 72 #ifdef PAE 73 #define VM_PHYSSEG_SPARSE 74 #else 75 #define VM_PHYSSEG_DENSE 76 #endif 77 78 /* 79 * The number of PHYSSEG entries must be one greater than the number 80 * of phys_avail entries because the phys_avail entry that spans the 81 * largest physical address that is accessible by ISA DMA is split 82 * into two PHYSSEG entries. 83 */ 84 #define VM_PHYSSEG_MAX 17 85 86 /* 87 * Create one free page pool. Since the i386 kernel virtual address 88 * space does not include a mapping onto the machine's entire physical 89 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 90 * pool, VM_FREEPOOL_DEFAULT. 91 */ 92 #define VM_NFREEPOOL 1 93 #define VM_FREEPOOL_DEFAULT 0 94 #define VM_FREEPOOL_DIRECT 0 95 96 /* 97 * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages 98 * that have physical addresses below 4G but are not accessible by ISA DMA, 99 * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA 100 * DMA. 101 */ 102 #define VM_NFREELIST 3 103 #define VM_FREELIST_DEFAULT 0 104 #define VM_FREELIST_DMA32 1 105 #define VM_FREELIST_LOWMEM 2 106 107 #define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */ 108 109 /* 110 * Always create DMA32 freelist if there is any memory above 4G. 111 * Bounce dma is extremely fragile and simultaneously intensively 112 * used. 113 */ 114 #define VM_DMA32_NPAGES_THRESHOLD 1 115 116 /* 117 * The largest allocation size is 2MB under PAE and 4MB otherwise. 118 */ 119 #define VM_NFREEORDER_PAE 10 120 #define VM_NFREEORDER_NOPAE 11 121 #define VM_NFREEORDER_MAX VM_NFREEORDER_NOPAE 122 #define VM_NFREEORDER i386_pmap_VM_NFREEORDER 123 124 /* 125 * Enable superpage reservations: 1 level. 126 */ 127 #ifndef VM_NRESERVLEVEL 128 #define VM_NRESERVLEVEL 1 129 #endif 130 131 /* 132 * Level 0 reservations consist of 512 pages when PAE pagetables are 133 * used, and 1024 pages otherwise. 134 */ 135 #ifndef VM_LEVEL_0_ORDER 136 #define VM_LEVEL_0_ORDER_PAE 9 137 #define VM_LEVEL_0_ORDER_NOPAE 10 138 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER_NOPAE 139 #define VM_LEVEL_0_ORDER i386_pmap_VM_LEVEL_0_ORDER 140 #else 141 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER 142 #endif 143 144 /* 145 * Kernel physical load address. 146 */ 147 #ifndef KERNLOAD 148 #define KERNLOAD (8 * 1024 * 1024) 149 #endif /* !defined(KERNLOAD) */ 150 151 /* 152 * Virtual addresses of things. Derived from the page directory and 153 * page table indexes from pmap.h for precision. 154 * Because of the page that is both a PD and PT, it looks a little 155 * messy at times, but hey, we'll do anything to save a page :-) 156 */ 157 158 #define VM_MAX_KERNEL_ADDRESS (0xffffffffU - 16 * 1024 * 1024 + 1) 159 160 #define VM_MIN_KERNEL_ADDRESS 0 161 162 #define KERNBASE KERNLOAD 163 164 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 165 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 166 167 #define VM_MAXUSER_ADDRESS (0xffffffff - 4 * 1024 * 1024 + 1) 168 169 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 170 #define USRSTACK SHAREDPAGE 171 172 #define VM_MAX_ADDRESS VADDR(PTDPTDI, 0) 173 #define VM_MIN_ADDRESS ((vm_offset_t)0) 174 175 #define PMAP_TRM_MIN_ADDRESS VM_MAXUSER_ADDRESS 176 #define PMAP_TRM_MAX_ADDRESS 0xffffffff 177 178 #define PMAP_MAP_LOW (4 * 1024 * 1024) 179 180 /* 181 * KVA layout. The unit of the system allocation is single PDE, which 182 * represents NBPDR bytes, aligned to NBPDR. NBPDR is 4M for non-PAE 183 * page tables, and 2M for PAE, so PAE mode requires twice as many PTDs 184 * to create the same memory map as non-PAE. 185 * 186 * 0x00000000 - 0x003fffff Transient identity map of low memory (0-4M), 187 * normally disabled to catch NULL derefs. 188 * 0x00400000 - 0x007fffff Fixed mapping of the low memory (4-8M). 189 * 0x00800000 - 0xffbfffff KERNBASE (VA) == KERNLOAD (PA), kernel 190 * text + data and all kernel maps. Managed 191 * by MI VM. 192 * 0xffc00000 - 0xffdfffff Recursive kernel page table mapping, pointed 193 * to by PTmap. PTD[] recursively points 194 * into PTmap. 195 * 0xffe00000 - 0xffffffff Kernel/User mode shared PDE, contains GDT, 196 * IDT, TSS, LDT, trampoline code and stacks. 197 * Managed by pmap_trm_alloc(). 198 */ 199 200 /* 201 * How many physical pages per kmem arena virtual page. 202 */ 203 #ifndef VM_KMEM_SIZE_SCALE 204 #define VM_KMEM_SIZE_SCALE (1) 205 #endif 206 207 /* 208 * Optional floor (in bytes) on the size of the kmem arena. 209 */ 210 #ifndef VM_KMEM_SIZE_MIN 211 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024) 212 #endif 213 214 /* 215 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the 216 * kernel map rounded to the nearest multiple of the superpage size. 217 */ 218 #ifndef VM_KMEM_SIZE_MAX 219 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 220 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 221 #endif 222 223 /* initial pagein size of beginning of executable file */ 224 #ifndef VM_INITIAL_PAGEIN 225 #define VM_INITIAL_PAGEIN 16 226 #endif 227 228 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 229 230 #ifndef VM_MAX_AUTOTUNE_MAXUSERS 231 #define VM_MAX_AUTOTUNE_MAXUSERS 384 232 #endif 233 234 #define SFBUF 235 #define SFBUF_MAP 236 #define SFBUF_CPUSET 237 #define SFBUF_PROCESS_PAGE 238 239 #define PMAP_HAS_DMAP 0 240 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; }) 241 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; }) 242 243 #endif /* _MACHINE_VMPARAM_H_ */ 244