1 /* $OpenBSD: uvm_init.c,v 1.39 2015/03/14 03:38:53 jsg 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/resourcevar.h> 39 #include <sys/mman.h> 40 #include <sys/malloc.h> 41 #include <sys/vnode.h> 42 #include <sys/pool.h> 43 44 #include <uvm/uvm.h> 45 #include <uvm/uvm_addr.h> 46 47 /* 48 * struct uvm: we store all global vars in this structure to make them 49 * easier to spot... 50 */ 51 52 struct uvm uvm; /* decl */ 53 struct uvmexp uvmexp; /* decl */ 54 55 #if defined(VM_MIN_KERNEL_ADDRESS) 56 vaddr_t vm_min_kernel_address = VM_MIN_KERNEL_ADDRESS; 57 #else 58 vaddr_t vm_min_kernel_address; 59 #endif 60 61 /* 62 * local prototypes 63 */ 64 65 /* 66 * uvm_init: init the VM system. called from kern/init_main.c. 67 */ 68 void 69 uvm_init(void) 70 { 71 vaddr_t kvm_start, kvm_end; 72 73 /* step 0: ensure that the hardware set the page size */ 74 if (uvmexp.pagesize == 0) { 75 panic("uvm_init: page size not set"); 76 } 77 78 /* step 1: set up stats. */ 79 averunnable.fscale = FSCALE; 80 81 /* 82 * step 2: init the page sub-system. this includes allocating the 83 * vm_page structures, and setting up all the page queues (and 84 * locks). available memory will be put in the "free" queue. 85 * kvm_start and kvm_end will be set to the area of kernel virtual 86 * memory which is available for general use. 87 */ 88 uvm_page_init(&kvm_start, &kvm_end); 89 90 /* 91 * step 3: init the map sub-system. allocates the static pool of 92 * vm_map_entry structures that are used for "special" kernel maps 93 * (e.g. kernel_map, kmem_map, etc...). 94 */ 95 uvm_map_init(); 96 97 /* 98 * step 4: setup the kernel's virtual memory data structures. this 99 * includes setting up the kernel_map/kernel_object and the kmem_map/ 100 * kmem_object. 101 */ 102 103 uvm_km_init(vm_min_kernel_address, kvm_start, kvm_end); 104 105 /* 106 * step 4.5: init (tune) the fault recovery code. 107 */ 108 uvmfault_init(); 109 110 /* 111 * step 5: init the pmap module. the pmap module is free to allocate 112 * memory for its private use (e.g. pvlists). 113 */ 114 pmap_init(); 115 116 /* 117 * step 6: init the kernel memory allocator. after this call the 118 * kernel memory allocator (malloc) can be used. 119 */ 120 kmeminit(); 121 122 /* 123 * step 6.5: init the dma allocator, which is backed by pools. 124 */ 125 dma_alloc_init(); 126 127 /* 128 * step 7: init all pagers and the pager_map. 129 */ 130 uvm_pager_init(); 131 132 /* 133 * step 8: init anonymous memory system 134 */ 135 amap_init(); 136 137 /* 138 * step 9: init uvm_km_page allocator memory. 139 */ 140 uvm_km_page_init(); 141 142 /* 143 * the VM system is now up! now that malloc is up we can 144 * enable paging of kernel objects. 145 */ 146 uao_create(VM_KERNEL_SPACE_SIZE, UAO_FLAG_KERNSWAP); 147 148 /* 149 * reserve some unmapped space for malloc/pool use after free usage 150 */ 151 #ifdef DEADBEEF0 152 kvm_start = trunc_page(DEADBEEF0) - PAGE_SIZE; 153 if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE, 154 NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(PROT_NONE, 155 PROT_NONE, MAP_INHERIT_NONE, MADV_RANDOM, UVM_FLAG_FIXED))) 156 panic("uvm_init: cannot reserve dead beef @0x%x", DEADBEEF0); 157 #endif 158 #ifdef DEADBEEF1 159 kvm_start = trunc_page(DEADBEEF1) - PAGE_SIZE; 160 if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE, 161 NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(PROT_NONE, 162 PROT_NONE, MAP_INHERIT_NONE, MADV_RANDOM, UVM_FLAG_FIXED))) 163 panic("uvm_init: cannot reserve dead beef @0x%x", DEADBEEF1); 164 #endif 165 /* 166 * init anonymous memory systems 167 */ 168 uvm_anon_init(); 169 170 #ifndef SMALL_KERNEL 171 /* 172 * Switch kernel and kmem_map over to a best-fit allocator, 173 * instead of walking the tree. 174 */ 175 uvm_map_set_uaddr(kernel_map, &kernel_map->uaddr_any[3], 176 uaddr_bestfit_create(vm_map_min(kernel_map), 177 vm_map_max(kernel_map))); 178 uvm_map_set_uaddr(kmem_map, &kmem_map->uaddr_any[3], 179 uaddr_bestfit_create(vm_map_min(kmem_map), 180 vm_map_max(kmem_map))); 181 #endif /* !SMALL_KERNEL */ 182 } 183