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 37 #ifndef _MACHINE_VMPARAM_H_ 38 #define _MACHINE_VMPARAM_H_ 1 39 40 /* 41 * Machine dependent constants for 386. 42 */ 43 44 /* 45 * Virtual memory related constants, all in bytes 46 */ 47 #define MAXTSIZ (128UL*1024*1024) /* max text size */ 48 #ifndef DFLDSIZ 49 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ 50 #endif 51 #ifndef MAXDSIZ 52 #define MAXDSIZ (512UL*1024*1024) /* max data size */ 53 #endif 54 #ifndef DFLSSIZ 55 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 56 #endif 57 #ifndef MAXSSIZ 58 #define MAXSSIZ (64UL*1024*1024) /* max stack size */ 59 #endif 60 #ifndef SGROWSIZ 61 #define SGROWSIZ (128UL*1024) /* amount to grow stack */ 62 #endif 63 64 /* 65 * Choose between DENSE and SPARSE based on whether lower execution time or 66 * lower kernel address space consumption is desired. Under PAE, kernel 67 * address space is often in short supply. 68 */ 69 #ifdef PAE 70 #define VM_PHYSSEG_SPARSE 71 #else 72 #define VM_PHYSSEG_DENSE 73 #endif 74 75 /* 76 * The number of PHYSSEG entries must be one greater than the number 77 * of phys_avail entries because the phys_avail entry that spans the 78 * largest physical address that is accessible by ISA DMA is split 79 * into two PHYSSEG entries. 80 */ 81 #define VM_PHYSSEG_MAX 17 82 83 /* 84 * Create one free page pool. Since the i386 kernel virtual address 85 * space does not include a mapping onto the machine's entire physical 86 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 87 * pool, VM_FREEPOOL_DEFAULT. 88 */ 89 #define VM_NFREEPOOL 1 90 #define VM_FREEPOOL_DEFAULT 0 91 #define VM_FREEPOOL_DIRECT 0 92 93 /* 94 * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages 95 * that have physical addresses below 4G but are not accessible by ISA DMA, 96 * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA 97 * DMA. 98 */ 99 #define VM_NFREELIST 3 100 #define VM_FREELIST_DEFAULT 0 101 #define VM_FREELIST_DMA32 1 102 #define VM_FREELIST_LOWMEM 2 103 104 #define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */ 105 106 /* 107 * Always create DMA32 freelist if there is any memory above 4G. 108 * Bounce dma is extremely fragile and simultaneously intensively 109 * used. 110 */ 111 #define VM_DMA32_NPAGES_THRESHOLD 1 112 113 /* 114 * The largest allocation size is 2MB under PAE and 4MB otherwise. 115 */ 116 #define VM_NFREEORDER_PAE 10 117 #define VM_NFREEORDER_NOPAE 11 118 #define VM_NFREEORDER_MAX VM_NFREEORDER_NOPAE 119 #define VM_NFREEORDER i386_pmap_VM_NFREEORDER 120 121 /* 122 * Enable superpage reservations: 1 level. 123 */ 124 #ifndef VM_NRESERVLEVEL 125 #define VM_NRESERVLEVEL 1 126 #endif 127 128 /* 129 * Level 0 reservations consist of 512 pages when PAE pagetables are 130 * used, and 1024 pages otherwise. 131 */ 132 #ifndef VM_LEVEL_0_ORDER 133 #define VM_LEVEL_0_ORDER_PAE 9 134 #define VM_LEVEL_0_ORDER_NOPAE 10 135 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER_NOPAE 136 #define VM_LEVEL_0_ORDER i386_pmap_VM_LEVEL_0_ORDER 137 #else 138 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER 139 #endif 140 141 /* 142 * Kernel physical load address. 143 */ 144 #ifndef KERNLOAD 145 #define KERNLOAD (8 * 1024 * 1024) 146 #endif /* !defined(KERNLOAD) */ 147 148 /* 149 * Virtual addresses of things. Derived from the page directory and 150 * page table indexes from pmap.h for precision. 151 * Because of the page that is both a PD and PT, it looks a little 152 * messy at times, but hey, we'll do anything to save a page :-) 153 */ 154 155 #define VM_MAX_KERNEL_ADDRESS (0xffffffffU - 16 * 1024 * 1024 + 1) 156 157 #define VM_MIN_KERNEL_ADDRESS 0 158 159 #define KERNBASE KERNLOAD 160 161 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 162 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 163 164 #define VM_MAXUSER_ADDRESS (0xffffffff - 4 * 1024 * 1024 + 1) 165 166 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 167 #define USRSTACK SHAREDPAGE 168 169 #define VM_MAX_ADDRESS VADDR(PTDPTDI, 0) 170 #define VM_MIN_ADDRESS ((vm_offset_t)0) 171 172 #define PMAP_TRM_MIN_ADDRESS VM_MAXUSER_ADDRESS 173 #define PMAP_TRM_MAX_ADDRESS 0xffffffff 174 175 #define PMAP_MAP_LOW (4 * 1024 * 1024) 176 177 /* 178 * KVA layout. The unit of the system allocation is single PDE, which 179 * represents NBPDR bytes, aligned to NBPDR. NBPDR is 4M for non-PAE 180 * page tables, and 2M for PAE, so PAE mode requires twice as many PTDs 181 * to create the same memory map as non-PAE. 182 * 183 * 0x00000000 - 0x003fffff Transient identity map of low memory (0-4M), 184 * normally disabled to catch NULL derefs. 185 * 0x00400000 - 0x007fffff Fixed mapping of the low memory (4-8M). 186 * 0x00800000 - 0xffbfffff KERNBASE (VA) == KERNLOAD (PA), kernel 187 * text + data and all kernel maps. Managed 188 * by MI VM. 189 * 0xffc00000 - 0xffdfffff Recursive kernel page table mapping, pointed 190 * to by PTmap. PTD[] recursively points 191 * into PTmap. 192 * 0xffe00000 - 0xffffffff Kernel/User mode shared PDE, contains GDT, 193 * IDT, TSS, LDT, trampoline code and stacks. 194 * Managed by pmap_trm_alloc(). 195 */ 196 197 /* 198 * How many physical pages per kmem arena virtual page. 199 */ 200 #ifndef VM_KMEM_SIZE_SCALE 201 #define VM_KMEM_SIZE_SCALE (1) 202 #endif 203 204 /* 205 * Optional floor (in bytes) on the size of the kmem arena. 206 */ 207 #ifndef VM_KMEM_SIZE_MIN 208 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024) 209 #endif 210 211 /* 212 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the 213 * kernel map rounded to the nearest multiple of the superpage size. 214 */ 215 #ifndef VM_KMEM_SIZE_MAX 216 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 217 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 218 #endif 219 220 /* initial pagein size of beginning of executable file */ 221 #ifndef VM_INITIAL_PAGEIN 222 #define VM_INITIAL_PAGEIN 16 223 #endif 224 225 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 226 227 #ifndef VM_MAX_AUTOTUNE_MAXUSERS 228 #define VM_MAX_AUTOTUNE_MAXUSERS 384 229 #endif 230 231 #define SFBUF 232 #define SFBUF_MAP 233 #define SFBUF_CPUSET 234 #define SFBUF_PROCESS_PAGE 235 236 #define PMAP_HAS_DMAP 0 237 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; }) 238 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; }) 239 240 /* 241 * No non-transparent large page support in the pmap. 242 */ 243 #define PMAP_HAS_LARGEPAGES 0 244 245 /* 246 * Need a page dump array for minidump. 247 */ 248 #define MINIDUMP_PAGE_TRACKING 1 249 #define MINIDUMP_STARTUP_PAGE_TRACKING 0 250 251 #endif /* _MACHINE_VMPARAM_H_ */ 252