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. 71 */ 72 #define VM_PHYSSEG_MAX 64 73 74 /* 75 * Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool 76 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is 77 * the pool from which physical pages for small UMA objects are 78 * allocated. 79 */ 80 #define VM_NFREEPOOL 2 81 #define VM_FREEPOOL_DEFAULT 0 82 #define VM_FREEPOOL_DIRECT 1 83 84 /* 85 * Create one free page list: VM_FREELIST_DEFAULT is for all physical 86 * pages. 87 */ 88 #define VM_NFREELIST 1 89 #define VM_FREELIST_DEFAULT 0 90 91 /* 92 * An allocation size of 16MB is supported in order to optimize the 93 * use of the direct map by UMA. Specifically, a cache line contains 94 * at most four TTEs, collectively mapping 16MB of physical memory. 95 * By reducing the number of distinct 16MB "pages" that are used by UMA, 96 * the physical memory allocator reduces the likelihood of both 4MB 97 * page TLB misses and cache misses caused by 4MB page TLB misses. 98 */ 99 #define VM_NFREEORDER 12 100 101 /* 102 * Enable superpage reservations: 1 level. 103 */ 104 #ifndef VM_NRESERVLEVEL 105 #define VM_NRESERVLEVEL 1 106 #endif 107 108 /* 109 * Level 0 reservations consist of 512 pages. 110 */ 111 #ifndef VM_LEVEL_0_ORDER 112 #define VM_LEVEL_0_ORDER 9 113 #endif 114 115 /** 116 * Address space layout. 117 * 118 * RISC-V implements multiple paging modes with different virtual address space 119 * sizes: SV32, SV39 and SV48. SV39 permits a virtual address space size of 120 * 512GB and uses a three-level page table. Since this is large enough for most 121 * purposes, we currently use SV39 for both userland and the kernel, avoiding 122 * the extra translation step required by SV48. 123 * 124 * The address space is split into two regions at each end of the 64-bit address 125 * space: 126 * 127 * 0x0000000000000000 - 0x0000003fffffffff 256GB user map 128 * 0x0000004000000000 - 0xffffffbfffffffff unmappable 129 * 0xffffffc000000000 - 0xffffffc7ffffffff 32GB kernel map 130 * 0xffffffc800000000 - 0xffffffcfffffffff 32GB unused 131 * 0xffffffd000000000 - 0xffffffefffffffff 128GB direct map 132 * 0xfffffff000000000 - 0xffffffffffffffff 64GB unused 133 * 134 * The kernel is loaded at the beginning of the kernel map. 135 * 136 * We define some interesting address constants: 137 * 138 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire 139 * 64 bit address space, mostly just for convenience. 140 * 141 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of 142 * mappable kernel virtual address space. 143 * 144 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the 145 * user address space. 146 */ 147 #define VM_MIN_ADDRESS (0x0000000000000000UL) 148 #define VM_MAX_ADDRESS (0xffffffffffffffffUL) 149 150 #define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL) 151 #define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL) 152 153 #define DMAP_MIN_ADDRESS (0xffffffd000000000UL) 154 #define DMAP_MAX_ADDRESS (0xfffffff000000000UL) 155 156 #define DMAP_MIN_PHYSADDR (dmap_phys_base) 157 #define DMAP_MAX_PHYSADDR (dmap_phys_max) 158 159 /* True if pa is in the dmap range */ 160 #define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \ 161 (pa) < DMAP_MAX_PHYSADDR) 162 /* True if va is in the dmap range */ 163 #define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \ 164 (va) < (dmap_max_addr)) 165 166 #define PMAP_HAS_DMAP 1 167 #define PHYS_TO_DMAP(pa) \ 168 ({ \ 169 KASSERT(PHYS_IN_DMAP(pa), \ 170 ("%s: PA out of range, PA: 0x%lx", __func__, \ 171 (vm_paddr_t)(pa))); \ 172 ((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \ 173 }) 174 175 #define DMAP_TO_PHYS(va) \ 176 ({ \ 177 KASSERT(VIRT_IN_DMAP(va), \ 178 ("%s: VA out of range, VA: 0x%lx", __func__, \ 179 (vm_offset_t)(va))); \ 180 ((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \ 181 }) 182 183 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL) 184 #define VM_MAX_USER_ADDRESS (0x0000004000000000UL) 185 186 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS) 187 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS) 188 189 #define KERNBASE (VM_MIN_KERNEL_ADDRESS) 190 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 191 #define USRSTACK SHAREDPAGE 192 193 #define KERNENTRY (0) 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 #define UMA_MD_SMALL_ALLOC 226 227 #ifndef LOCORE 228 extern vm_paddr_t dmap_phys_base; 229 extern vm_paddr_t dmap_phys_max; 230 extern vm_offset_t dmap_max_addr; 231 extern vm_offset_t vm_max_kernel_address; 232 extern vm_offset_t init_pt_va; 233 #endif 234 235 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 236 237 #define DEVMAP_MAX_VADDR VM_MAX_KERNEL_ADDRESS 238 239 #endif /* !_MACHINE_VMPARAM_H_ */ 240