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