1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * Copyright (c) 1994 John S. Dyson 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 35 * from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30 36 * $FreeBSD$ 37 */ 38 39 #ifndef _MACHINE_VMPARAM_H_ 40 #define _MACHINE_VMPARAM_H_ 41 42 /* 43 * Virtual memory related constants, all in bytes 44 */ 45 #ifndef MAXTSIZ 46 #define MAXTSIZ (1*1024*1024*1024) /* max text size */ 47 #endif 48 #ifndef DFLDSIZ 49 #define DFLDSIZ (128*1024*1024) /* initial data size limit */ 50 #endif 51 #ifndef MAXDSIZ 52 #define MAXDSIZ (1*1024*1024*1024) /* max data size */ 53 #endif 54 #ifndef DFLSSIZ 55 #define DFLSSIZ (128*1024*1024) /* initial stack size limit */ 56 #endif 57 #ifndef MAXSSIZ 58 #define MAXSSIZ (1*1024*1024*1024) /* max stack size */ 59 #endif 60 #ifndef SGROWSIZ 61 #define SGROWSIZ (128*1024) /* amount to grow stack */ 62 #endif 63 64 /* 65 * The physical address space is sparsely populated. 66 */ 67 #define VM_PHYSSEG_SPARSE 68 69 /* 70 * The number of PHYSSEG entries must be one greater than the number 71 * of phys_avail entries because the phys_avail entry that spans the 72 * largest physical address that is accessible by ISA DMA is split 73 * into two PHYSSEG entries. 74 */ 75 #define VM_PHYSSEG_MAX 64 76 77 /* 78 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool 79 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is 80 * the pool from which physical pages for small UMA objects are 81 * allocated. 82 */ 83 #define VM_NFREEPOOL 3 84 #define VM_FREEPOOL_CACHE 2 85 #define VM_FREEPOOL_DEFAULT 0 86 #define VM_FREEPOOL_DIRECT 1 87 88 /* 89 * Create two free page lists: VM_FREELIST_DEFAULT is for physical 90 * pages that are above the largest physical address that is 91 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 92 * that are below that address. 93 */ 94 #define VM_NFREELIST 2 95 #define VM_FREELIST_DEFAULT 0 96 #define VM_FREELIST_ISADMA 1 97 98 /* 99 * An allocation size of 16MB is supported in order to optimize the 100 * use of the direct map by UMA. Specifically, a cache line contains 101 * at most four TTEs, collectively mapping 16MB of physical memory. 102 * By reducing the number of distinct 16MB "pages" that are used by UMA, 103 * the physical memory allocator reduces the likelihood of both 4MB 104 * page TLB misses and cache misses caused by 4MB page TLB misses. 105 */ 106 #define VM_NFREEORDER 12 107 108 /* 109 * Enable superpage reservations: 1 level. 110 */ 111 #ifndef VM_NRESERVLEVEL 112 #define VM_NRESERVLEVEL 1 113 #endif 114 115 /* 116 * Level 0 reservations consist of 512 pages. 117 */ 118 #ifndef VM_LEVEL_0_ORDER 119 #define VM_LEVEL_0_ORDER 9 120 #endif 121 122 /** 123 * Address space layout. 124 * 125 * ARMv8 implements up to a 48 bit virtual address space. The address space is 126 * split into 2 regions at each end of the 64 bit address space, with an 127 * out of range "hole" in the middle. 128 * 129 * We limit the size of the two spaces to 39 bits each. 130 * 131 * Upper region: 0xffffffffffffffff 132 * 0xffffff8000000000 133 * 134 * Hole: 0xffffff7fffffffff 135 * 0x0000008000000000 136 * 137 * Lower region: 0x0000007fffffffff 138 * 0x0000000000000000 139 * 140 * We use the upper region for the kernel, and the lower region for userland. 141 * 142 * We define some interesting address constants: 143 * 144 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire 145 * 64 bit address space, mostly just for convenience. 146 * 147 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of 148 * mappable kernel virtual address space. 149 * 150 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the 151 * user address space. 152 */ 153 #define VM_MIN_ADDRESS (0x0000000000000000UL) 154 #define VM_MAX_ADDRESS (0xffffffffffffffffUL) 155 156 /* 32 GiB of kernel addresses */ 157 #define VM_MIN_KERNEL_ADDRESS (0xffffff8000000000UL) 158 #define VM_MAX_KERNEL_ADDRESS (0xffffff8800000000UL) 159 160 /* Direct Map for 64 GiB of PA: 0x0 - 0xfffffffff */ 161 #define DMAP_MIN_ADDRESS (0xffffffc000000000UL) 162 #define DMAP_MAX_ADDRESS (0xffffffcfffffffffUL) 163 164 #define DMAP_MIN_PHYSADDR (0x0000000000000000UL) 165 #define DMAP_MAX_PHYSADDR (DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS) 166 167 /* True if pa is in the dmap range */ 168 #define PHYS_IN_DMAP(pa) ((pa) <= DMAP_MAX_PHYSADDR) 169 170 #define PHYS_TO_DMAP(pa) \ 171 ({ \ 172 KASSERT(PHYS_IN_DMAP(pa), \ 173 ("%s: PA out of range, PA: 0x%lx", __func__, \ 174 (vm_paddr_t)(pa))); \ 175 (pa) | DMAP_MIN_ADDRESS; \ 176 }) 177 178 #define DMAP_TO_PHYS(va) \ 179 ({ \ 180 KASSERT(((va) <= DMAP_MAX_ADDRESS || (va) >= DMAP_MIN_ADDRESS), \ 181 ("%s: VA out of range, VA: 0x%lx", __func__, \ 182 (vm_offset_t)(va))); \ 183 (va) & ~DMAP_MIN_ADDRESS; \ 184 }) 185 186 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL) 187 #define VM_MAX_USER_ADDRESS (0x0000008000000000UL) 188 189 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS) 190 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS) 191 192 #define KERNBASE (VM_MIN_KERNEL_ADDRESS) 193 #define USRSTACK (VM_MAX_USER_ADDRESS) 194 195 /* 196 * How many physical pages per kmem arena virtual page. 197 */ 198 #ifndef VM_KMEM_SIZE_SCALE 199 #define VM_KMEM_SIZE_SCALE (3) 200 #endif 201 202 /* 203 * Optional floor (in bytes) on the size of the kmem arena. 204 */ 205 #ifndef VM_KMEM_SIZE_MIN 206 #define VM_KMEM_SIZE_MIN (16 * 1024 * 1024) 207 #endif 208 209 /* 210 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the 211 * kernel map. 212 */ 213 #ifndef VM_KMEM_SIZE_MAX 214 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \ 215 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5) 216 #endif 217 218 /* 219 * Initial pagein size of beginning of executable file. 220 */ 221 #ifndef VM_INITIAL_PAGEIN 222 #define VM_INITIAL_PAGEIN 16 223 #endif 224 225 extern u_int tsb_kernel_ldd_phys; 226 extern vm_offset_t vm_max_kernel_address; 227 extern vm_offset_t init_pt_va; 228 229 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 230 231 #endif /* !_MACHINE_VMPARAM_H_ */ 232