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 (32*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 (128*1024*1024) /* max data size */ 53 #endif 54 #ifndef DFLSSIZ 55 #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ 56 #endif 57 #ifndef MAXSSIZ 58 #define MAXSSIZ (8*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 two 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 2 84 #define VM_FREEPOOL_DEFAULT 0 85 #define VM_FREEPOOL_DIRECT 1 86 87 /* 88 * Create two free page lists: VM_FREELIST_DEFAULT is for physical 89 * pages that are above the largest physical address that is 90 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 91 * that are below that address. 92 */ 93 #define VM_NFREELIST 2 94 #define VM_FREELIST_DEFAULT 0 95 #define VM_FREELIST_ISADMA 1 96 97 /* 98 * An allocation size of 16MB is supported in order to optimize the 99 * use of the direct map by UMA. Specifically, a cache line contains 100 * at most four TTEs, collectively mapping 16MB of physical memory. 101 * By reducing the number of distinct 16MB "pages" that are used by UMA, 102 * the physical memory allocator reduces the likelihood of both 4MB 103 * page TLB misses and cache misses caused by 4MB page TLB misses. 104 */ 105 #define VM_NFREEORDER 12 106 107 /* 108 * Enable superpage reservations: 1 level. 109 */ 110 #ifndef VM_NRESERVLEVEL 111 #define VM_NRESERVLEVEL 1 112 #endif 113 114 /* 115 * Level 0 reservations consist of 512 pages. 116 */ 117 #ifndef VM_LEVEL_0_ORDER 118 #define VM_LEVEL_0_ORDER 9 119 #endif 120 121 /** 122 * Address space layout. 123 * 124 * RISC-V implements up to a 48 bit virtual address space. The address space is 125 * split into 2 regions at each end of the 64 bit address space, with an 126 * out of range "hole" in the middle. 127 * 128 * We limit the size of the two spaces to 39 bits each. 129 * 130 * Upper region: 0xffffffffffffffff 131 * 0xffffffffc0000000 132 * 133 * Hole: 0xffffffffbfffffff 134 * 0x0000000080000000 135 * 136 * Lower region: 0x000000007fffffff 137 * 0x0000000000000000 138 * 139 * We use the upper region for the kernel, and the lower region for userland. 140 * 141 * We define some interesting address constants: 142 * 143 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire 144 * 64 bit address space, mostly just for convenience. 145 * 146 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of 147 * mappable kernel virtual address space. 148 * 149 * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the 150 * user address space. 151 */ 152 #define VM_MIN_ADDRESS (0x0000000000000000UL) 153 #define VM_MAX_ADDRESS (0xffffffffffffffffUL) 154 155 /* 256 MiB of kernel addresses */ 156 #define VM_MIN_KERNEL_ADDRESS (0xffffffffc0000000UL) 157 #define VM_MAX_KERNEL_ADDRESS (0xffffffffcfffffffUL) 158 159 /* Direct Map for 512 MiB of PA: 0x0 - 0x1fffffff */ 160 #define DMAP_MIN_ADDRESS (0xffffffffd0000000UL) 161 #define DMAP_MAX_ADDRESS (0xffffffffefffffffUL) 162 163 #define DMAP_MIN_PHYSADDR (0x0000000000000000UL) 164 #define DMAP_MAX_PHYSADDR (DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS) 165 166 /* True if pa is in the dmap range */ 167 #define PHYS_IN_DMAP(pa) ((pa) <= DMAP_MAX_PHYSADDR) 168 /* True if va is in the dmap range */ 169 #define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \ 170 (va) <= DMAP_MAX_ADDRESS) 171 172 #define PHYS_TO_DMAP(pa) \ 173 ({ \ 174 KASSERT(PHYS_IN_DMAP(pa), \ 175 ("%s: PA out of range, PA: 0x%lx", __func__, \ 176 (vm_paddr_t)(pa))); \ 177 (pa) | DMAP_MIN_ADDRESS; \ 178 }) 179 180 #define DMAP_TO_PHYS(va) \ 181 ({ \ 182 KASSERT(VIRT_IN_DMAP(va), \ 183 ("%s: VA out of range, VA: 0x%lx", __func__, \ 184 (vm_offset_t)(va))); \ 185 (va) & ~DMAP_MIN_ADDRESS; \ 186 }) 187 188 #define VM_MIN_USER_ADDRESS (0x0000000000000000UL) 189 #define VM_MAX_USER_ADDRESS (0x0000000080000000UL) 190 191 #define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS) 192 #define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS) 193 194 #define KERNBASE (VM_MIN_KERNEL_ADDRESS) 195 #define USRSTACK (VM_MAX_USER_ADDRESS) 196 #define KERNENTRY (0x200) 197 198 /* 199 * How many physical pages per kmem arena virtual page. 200 */ 201 #ifndef VM_KMEM_SIZE_SCALE 202 #define VM_KMEM_SIZE_SCALE (3) 203 #endif 204 205 /* 206 * Optional floor (in bytes) on the size of the kmem arena. 207 */ 208 #ifndef VM_KMEM_SIZE_MIN 209 #define VM_KMEM_SIZE_MIN (16 * 1024 * 1024) 210 #endif 211 212 /* 213 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the 214 * kernel map. 215 */ 216 #ifndef VM_KMEM_SIZE_MAX 217 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \ 218 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5) 219 #endif 220 221 /* 222 * Initial pagein size of beginning of executable file. 223 */ 224 #ifndef VM_INITIAL_PAGEIN 225 #define VM_INITIAL_PAGEIN 16 226 #endif 227 228 /* 229 * RISCVTODO 230 * #define UMA_MD_SMALL_ALLOC 231 */ 232 233 extern u_int tsb_kernel_ldd_phys; 234 extern vm_offset_t vm_max_kernel_address; 235 extern vm_offset_t init_pt_va; 236 237 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 238 239 #endif /* !_MACHINE_VMPARAM_H_ */ 240