1 /* $OpenBSD: uvm_init.c,v 1.42 2021/03/20 10:24:21 mpi Exp $ */ 2 /* $NetBSD: uvm_init.c,v 1.14 2000/06/27 17:29:23 mrg Exp $ */ 3 4 /* 5 * Copyright (c) 1997 Charles D. Cranor and Washington University. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp 29 */ 30 31 /* 32 * uvm_init.c: init the vm system. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/filedesc.h> 38 #include <sys/percpu.h> 39 #include <sys/resourcevar.h> 40 #include <sys/mman.h> 41 #include <sys/malloc.h> 42 #include <sys/vnode.h> 43 #include <sys/pool.h> 44 45 #include <uvm/uvm.h> 46 #include <uvm/uvm_addr.h> 47 48 /* 49 * struct uvm: we store all global vars in this structure to make them 50 * easier to spot... 51 */ 52 53 struct uvm uvm; /* decl */ 54 struct uvmexp uvmexp; /* decl */ 55 56 COUNTERS_BOOT_MEMORY(uvmexp_countersboot, exp_ncounters); 57 struct cpumem *uvmexp_counters = COUNTERS_BOOT_INITIALIZER(uvmexp_countersboot); 58 59 #if defined(VM_MIN_KERNEL_ADDRESS) 60 vaddr_t vm_min_kernel_address = VM_MIN_KERNEL_ADDRESS; 61 #else 62 vaddr_t vm_min_kernel_address; 63 #endif 64 65 /* 66 * local prototypes 67 */ 68 69 /* 70 * uvm_init: init the VM system. called from kern/init_main.c. 71 */ 72 73 void 74 uvm_init(void) 75 { 76 vaddr_t kvm_start, kvm_end; 77 78 /* 79 * Ensure that the hardware set the page size. 80 */ 81 if (uvmexp.pagesize == 0) { 82 panic("uvm_init: page size not set"); 83 } 84 averunnable.fscale = FSCALE; 85 86 /* 87 * Init the page sub-system. This includes allocating the vm_page 88 * structures, and setting up all the page queues (and locks). 89 * Available memory will be put in the "free" queue, kvm_start and 90 * kvm_end will be set to the area of kernel virtual memory which 91 * is available for general use. 92 */ 93 uvm_page_init(&kvm_start, &kvm_end); 94 95 /* 96 * Init the map sub-system. 97 * 98 * Allocates the static pool of vm_map_entry structures that are 99 * used for "special" kernel maps (e.g. kernel_map, kmem_map, etc...). 100 */ 101 uvm_map_init(); 102 103 /* 104 * Setup the kernel's virtual memory data structures. This includes 105 * setting up the kernel_map/kernel_object. 106 */ 107 uvm_km_init(vm_min_kernel_address, kvm_start, kvm_end); 108 109 /* 110 * step 4.5: init (tune) the fault recovery code. 111 */ 112 uvmfault_init(); 113 114 /* 115 * Init the pmap module. The pmap module is free to allocate 116 * memory for its private use (e.g. pvlists). 117 */ 118 pmap_init(); 119 120 /* 121 * step 6: init uvm_km_page allocator memory. 122 */ 123 uvm_km_page_init(); 124 125 /* 126 * Make kernel memory allocators ready for use. 127 * After this call the malloc memory allocator can be used. 128 */ 129 kmeminit(); 130 131 /* 132 * step 7.5: init the dma allocator, which is backed by pools. 133 */ 134 dma_alloc_init(); 135 136 /* 137 * Init all pagers and the pager_map. 138 */ 139 uvm_pager_init(); 140 141 /* 142 * step 9: init anonymous memory system 143 */ 144 amap_init(); 145 146 /* 147 * step 10: start uvm_km_page allocator thread. 148 */ 149 uvm_km_page_lateinit(); 150 151 /* 152 * the VM system is now up! now that malloc is up we can 153 * enable paging of kernel objects. 154 */ 155 uao_create(VM_KERNEL_SPACE_SIZE, UAO_FLAG_KERNSWAP); 156 157 /* 158 * reserve some unmapped space for malloc/pool use after free usage 159 */ 160 #ifdef DEADBEEF0 161 kvm_start = trunc_page(DEADBEEF0) - PAGE_SIZE; 162 if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE, 163 NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(PROT_NONE, 164 PROT_NONE, MAP_INHERIT_NONE, MADV_RANDOM, UVM_FLAG_FIXED))) 165 panic("uvm_init: cannot reserve dead beef @0x%x", DEADBEEF0); 166 #endif 167 #ifdef DEADBEEF1 168 kvm_start = trunc_page(DEADBEEF1) - PAGE_SIZE; 169 if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE, 170 NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(PROT_NONE, 171 PROT_NONE, MAP_INHERIT_NONE, MADV_RANDOM, UVM_FLAG_FIXED))) 172 panic("uvm_init: cannot reserve dead beef @0x%x", DEADBEEF1); 173 #endif 174 /* 175 * Init anonymous memory systems. 176 */ 177 uvm_anon_init(); 178 179 #ifndef SMALL_KERNEL 180 /* 181 * Switch kernel and kmem_map over to a best-fit allocator, 182 * instead of walking the tree. 183 */ 184 uvm_map_set_uaddr(kernel_map, &kernel_map->uaddr_any[3], 185 uaddr_bestfit_create(vm_map_min(kernel_map), 186 vm_map_max(kernel_map))); 187 uvm_map_set_uaddr(kmem_map, &kmem_map->uaddr_any[3], 188 uaddr_bestfit_create(vm_map_min(kmem_map), 189 vm_map_max(kmem_map))); 190 #endif /* !SMALL_KERNEL */ 191 } 192 193 void 194 uvm_init_percpu(void) 195 { 196 uvmexp_counters = counters_alloc_ncpus(uvmexp_counters, exp_ncounters); 197 } 198