1 /*- 2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU) 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * The Mach Operating System project at Carnegie-Mellon University. 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 * 35 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 36 * All rights reserved. 37 * 38 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 39 * 40 * Permission to use, copy, modify and distribute this software and 41 * its documentation is hereby granted, provided that both the copyright 42 * notice and this permission notice appear in all copies of the 43 * software, derivative works or modified versions, and any portions 44 * thereof, and that both notices appear in supporting documentation. 45 * 46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 49 * 50 * Carnegie Mellon requests users of this software to return to 51 * 52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 53 * School of Computer Science 54 * Carnegie Mellon University 55 * Pittsburgh PA 15213-3890 56 * 57 * any improvements or extensions that they make and grant Carnegie the 58 * rights to redistribute these changes. 59 */ 60 61 /* 62 * Initialize the Virtual Memory subsystem. 63 */ 64 65 #include <sys/param.h> 66 #include <sys/domainset.h> 67 #include <sys/kernel.h> 68 #include <sys/lock.h> 69 #include <sys/proc.h> 70 #include <sys/rwlock.h> 71 #include <sys/malloc.h> 72 #include <sys/sysctl.h> 73 #include <sys/systm.h> 74 #include <sys/selinfo.h> 75 #include <sys/smp.h> 76 #include <sys/pipe.h> 77 #include <sys/bio.h> 78 #include <sys/buf.h> 79 #include <sys/vmem.h> 80 #include <sys/vmmeter.h> 81 82 #include <vm/vm.h> 83 #include <vm/vm_param.h> 84 #include <vm/vm_kern.h> 85 #include <vm/vm_object.h> 86 #include <vm/vm_page.h> 87 #include <vm/vm_phys.h> 88 #include <vm/vm_pagequeue.h> 89 #include <vm/vm_map.h> 90 #include <vm/vm_pager.h> 91 #include <vm/vm_extern.h> 92 93 extern void uma_startup1(vm_offset_t); 94 95 long physmem; 96 97 /* 98 * System initialization 99 */ 100 static void vm_mem_init(void *); 101 SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_FIRST, vm_mem_init, NULL); 102 103 /* 104 * vm_init initializes the virtual memory system. 105 * This is done only by the first cpu up. 106 */ 107 static void 108 vm_mem_init(void *dummy) 109 { 110 111 /* 112 * Initialize static domainsets, used by various allocators. 113 */ 114 domainset_init(); 115 116 /* 117 * Initialize resident memory structures. From here on, all physical 118 * memory is accounted for, and we use only virtual addresses. 119 */ 120 vm_set_page_size(); 121 virtual_avail = vm_page_startup(virtual_avail); 122 123 /* 124 * Set an initial domain policy for thread0 so that allocations 125 * can work. 126 */ 127 domainset_zero(); 128 129 /* Bootstrap the kernel memory allocator. */ 130 uma_startup1(virtual_avail); 131 132 /* 133 * Initialize other VM packages 134 */ 135 vmem_startup(); 136 vm_object_init(); 137 vm_map_startup(); 138 kmem_init(virtual_avail, virtual_end); 139 140 kmem_init_zero_region(); 141 pmap_init(); 142 vm_pager_init(); 143 } 144 145 void 146 vm_ksubmap_init(struct kva_md_info *kmi) 147 { 148 caddr_t firstaddr, v; 149 vm_size_t size = 0; 150 long physmem_est; 151 vm_offset_t minaddr; 152 vm_offset_t maxaddr; 153 154 TSENTER(); 155 /* 156 * Allocate space for system data structures. 157 * The first available kernel virtual address is in "v". 158 * As pages of kernel virtual memory are allocated, "v" is incremented. 159 * As pages of memory are allocated and cleared, 160 * "firstaddr" is incremented. 161 */ 162 163 /* 164 * Make two passes. The first pass calculates how much memory is 165 * needed and allocates it. The second pass assigns virtual 166 * addresses to the various data structures. 167 */ 168 firstaddr = NULL; 169 again: 170 v = firstaddr; 171 172 /* 173 * Discount the physical memory larger than the size of kernel_map 174 * to avoid eating up all of KVA space. 175 */ 176 physmem_est = lmin(physmem, btoc(vm_map_max(kernel_map) - 177 vm_map_min(kernel_map))); 178 179 v = kern_vfs_bio_buffer_alloc(v, physmem_est); 180 181 /* 182 * End of first pass, size has been calculated so allocate memory 183 */ 184 if (firstaddr == NULL) { 185 size = (vm_size_t)v; 186 #ifdef VM_FREELIST_DMA32 187 /* 188 * Try to protect 32-bit DMAable memory from the largest 189 * early alloc of wired mem. 190 */ 191 firstaddr = kmem_alloc_attr(size, M_ZERO | M_NOWAIT, 192 (vm_paddr_t)1 << 32, ~(vm_paddr_t)0, VM_MEMATTR_DEFAULT); 193 if (firstaddr == NULL) 194 #endif 195 firstaddr = kmem_malloc(size, M_ZERO | M_WAITOK); 196 if (firstaddr == NULL) 197 panic("startup: no room for tables"); 198 goto again; 199 } 200 201 /* 202 * End of second pass, addresses have been assigned 203 */ 204 if ((vm_size_t)(v - firstaddr) != size) 205 panic("startup: table size inconsistency"); 206 207 /* 208 * Allocate the clean map to hold all of I/O virtual memory. 209 */ 210 size = (long)nbuf * BKVASIZE + (long)bio_transient_maxcnt * maxphys; 211 kmi->clean_sva = kva_alloc(size); 212 kmi->clean_eva = kmi->clean_sva + size; 213 214 /* 215 * Allocate the buffer arena. 216 * 217 * Enable the quantum cache if we have more than 4 cpus. This 218 * avoids lock contention at the expense of some fragmentation. 219 */ 220 size = (long)nbuf * BKVASIZE; 221 kmi->buffer_sva = kmi->clean_sva; 222 kmi->buffer_eva = kmi->buffer_sva + size; 223 vmem_init(buffer_arena, "buffer arena", kmi->buffer_sva, size, 224 PAGE_SIZE, (mp_ncpus > 4) ? BKVASIZE * 8 : 0, M_WAITOK); 225 226 /* 227 * And optionally transient bio space. 228 */ 229 if (bio_transient_maxcnt != 0) { 230 size = (long)bio_transient_maxcnt * maxphys; 231 vmem_init(transient_arena, "transient arena", 232 kmi->buffer_eva, size, PAGE_SIZE, 0, M_WAITOK); 233 } 234 235 /* 236 * Allocate the pageable submaps. We may cache an exec map entry per 237 * CPU, so we therefore need to reserve space for at least ncpu+1 238 * entries to avoid deadlock. The exec map is also used by some image 239 * activators, so we leave a fixed number of pages for their use. 240 */ 241 #ifdef __LP64__ 242 exec_map_entries = 8 * mp_ncpus; 243 #else 244 exec_map_entries = 2 * mp_ncpus + 4; 245 #endif 246 exec_map_entry_size = round_page(PATH_MAX + ARG_MAX); 247 kmem_subinit(exec_map, kernel_map, &minaddr, &maxaddr, 248 exec_map_entries * exec_map_entry_size + 64 * PAGE_SIZE, false); 249 kmem_subinit(pipe_map, kernel_map, &minaddr, &maxaddr, maxpipekva, 250 false); 251 TSEXIT(); 252 } 253