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 */ 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 * Choose between DENSE and SPARSE based on whether lower execution time or 68 * lower kernel address space consumption is desired. Under PAE, kernel 69 * address space is often in short supply. 70 */ 71 #ifdef PAE 72 #define VM_PHYSSEG_SPARSE 73 #else 74 #define VM_PHYSSEG_DENSE 75 #endif 76 77 /* 78 * The number of PHYSSEG entries must be one greater than the number 79 * of phys_avail entries because the phys_avail entry that spans the 80 * largest physical address that is accessible by ISA DMA is split 81 * into two PHYSSEG entries. 82 */ 83 #define VM_PHYSSEG_MAX 17 84 85 /* 86 * Create one free page pool. Since the i386 kernel virtual address 87 * space does not include a mapping onto the machine's entire physical 88 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 89 * pool, VM_FREEPOOL_DEFAULT. 90 */ 91 #define VM_NFREEPOOL 1 92 #define VM_FREEPOOL_DEFAULT 0 93 #define VM_FREEPOOL_DIRECT 0 94 95 /* 96 * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages 97 * that have physical addresses below 4G but are not accessible by ISA DMA, 98 * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA 99 * DMA. 100 */ 101 #define VM_NFREELIST 3 102 #define VM_FREELIST_DEFAULT 0 103 #define VM_FREELIST_DMA32 1 104 #define VM_FREELIST_LOWMEM 2 105 106 #define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */ 107 108 /* 109 * Always create DMA32 freelist if there is any memory above 4G. 110 * Bounce dma is extremely fragile and simultaneously intensively 111 * used. 112 */ 113 #define VM_DMA32_NPAGES_THRESHOLD 1 114 115 /* 116 * The largest allocation size is 2MB under PAE and 4MB otherwise. 117 */ 118 #define VM_NFREEORDER_PAE 10 119 #define VM_NFREEORDER_NOPAE 11 120 #define VM_NFREEORDER_MAX VM_NFREEORDER_NOPAE 121 #define VM_NFREEORDER i386_pmap_VM_NFREEORDER 122 123 /* 124 * Enable superpage reservations: 1 level. 125 */ 126 #ifndef VM_NRESERVLEVEL 127 #define VM_NRESERVLEVEL 1 128 #endif 129 130 /* 131 * Level 0 reservations consist of 512 pages when PAE pagetables are 132 * used, and 1024 pages otherwise. 133 */ 134 #ifndef VM_LEVEL_0_ORDER 135 #define VM_LEVEL_0_ORDER_PAE 9 136 #define VM_LEVEL_0_ORDER_NOPAE 10 137 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER_NOPAE 138 #define VM_LEVEL_0_ORDER i386_pmap_VM_LEVEL_0_ORDER 139 #else 140 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER 141 #endif 142 143 /* 144 * Kernel physical load address. 145 */ 146 #ifndef KERNLOAD 147 #define KERNLOAD (8 * 1024 * 1024) 148 #endif /* !defined(KERNLOAD) */ 149 150 /* 151 * Virtual addresses of things. Derived from the page directory and 152 * page table indexes from pmap.h for precision. 153 * Because of the page that is both a PD and PT, it looks a little 154 * messy at times, but hey, we'll do anything to save a page :-) 155 */ 156 157 #define VM_MAX_KERNEL_ADDRESS (0xffffffffU - 16 * 1024 * 1024 + 1) 158 159 #define VM_MIN_KERNEL_ADDRESS 0 160 161 #define KERNBASE KERNLOAD 162 163 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 164 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 165 166 #define VM_MAXUSER_ADDRESS (0xffffffff - 4 * 1024 * 1024 + 1) 167 168 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 169 #define USRSTACK SHAREDPAGE 170 171 #define VM_MAX_ADDRESS VADDR(PTDPTDI, 0) 172 #define VM_MIN_ADDRESS ((vm_offset_t)0) 173 174 #define PMAP_TRM_MIN_ADDRESS VM_MAXUSER_ADDRESS 175 #define PMAP_TRM_MAX_ADDRESS 0xffffffff 176 177 #define PMAP_MAP_LOW (4 * 1024 * 1024) 178 179 /* 180 * KVA layout. The unit of the system allocation is single PDE, which 181 * represents NBPDR bytes, aligned to NBPDR. NBPDR is 4M for non-PAE 182 * page tables, and 2M for PAE, so PAE mode requires twice as many PTDs 183 * to create the same memory map as non-PAE. 184 * 185 * 0x00000000 - 0x003fffff Transient identity map of low memory (0-4M), 186 * normally disabled to catch NULL derefs. 187 * 0x00400000 - 0x007fffff Fixed mapping of the low memory (4-8M). 188 * 0x00800000 - 0xffbfffff KERNBASE (VA) == KERNLOAD (PA), kernel 189 * text + data and all kernel maps. Managed 190 * by MI VM. 191 * 0xffc00000 - 0xffdfffff Recursive kernel page table mapping, pointed 192 * to by PTmap. PTD[] recursively points 193 * into PTmap. 194 * 0xffe00000 - 0xffffffff Kernel/User mode shared PDE, contains GDT, 195 * IDT, TSS, LDT, trampoline code and stacks. 196 * Managed by pmap_trm_alloc(). 197 */ 198 199 /* 200 * How many physical pages per kmem arena virtual page. 201 */ 202 #ifndef VM_KMEM_SIZE_SCALE 203 #define VM_KMEM_SIZE_SCALE (1) 204 #endif 205 206 /* 207 * Optional floor (in bytes) on the size of the kmem arena. 208 */ 209 #ifndef VM_KMEM_SIZE_MIN 210 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024) 211 #endif 212 213 /* 214 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the 215 * kernel map rounded to the nearest multiple of the superpage size. 216 */ 217 #ifndef VM_KMEM_SIZE_MAX 218 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 219 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 220 #endif 221 222 /* initial pagein size of beginning of executable file */ 223 #ifndef VM_INITIAL_PAGEIN 224 #define VM_INITIAL_PAGEIN 16 225 #endif 226 227 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 228 229 #ifndef VM_MAX_AUTOTUNE_MAXUSERS 230 #define VM_MAX_AUTOTUNE_MAXUSERS 384 231 #endif 232 233 #define SFBUF 234 #define SFBUF_MAP 235 #define SFBUF_CPUSET 236 #define SFBUF_PROCESS_PAGE 237 238 #define PMAP_HAS_DMAP 0 239 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; }) 240 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; }) 241 242 /* 243 * No non-transparent large page support in the pmap. 244 */ 245 #define PMAP_HAS_LARGEPAGES 0 246 247 /* 248 * Need a page dump array for minidump. 249 */ 250 #define MINIDUMP_PAGE_TRACKING 1 251 252 #endif /* _MACHINE_VMPARAM_H_ */ 253