1 /* $OpenBSD: uvm_init.c,v 1.16 2007/06/18 21:51:15 pedro Exp $ */
2 /* $NetBSD: uvm_init.c,v 1.14 2000/06/27 17:29:23 mrg Exp $ */
3
4 /*
5 *
6 * Copyright (c) 1997 Charles D. Cranor and Washington University.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Charles D. Cranor and
20 * Washington University.
21 * 4. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
36 */
37
38 /*
39 * uvm_init.c: init the vm system.
40 */
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/file.h>
45 #include <sys/filedesc.h>
46 #include <sys/resourcevar.h>
47 #include <sys/mman.h>
48 #include <sys/proc.h>
49 #include <sys/malloc.h>
50 #include <sys/vnode.h>
51
52 #include <uvm/uvm.h>
53
54 /*
55 * struct uvm: we store all global vars in this structure to make them
56 * easier to spot...
57 */
58
59 struct uvm uvm; /* decl */
60 struct uvmexp uvmexp; /* decl */
61
62 /*
63 * local prototypes
64 */
65
66 /*
67 * uvm_init: init the VM system. called from kern/init_main.c.
68 */
69
70 void
71 uvm_init()
72 {
73 vaddr_t kvm_start, kvm_end;
74
75 /*
76 * step 0: ensure that the hardware set the page size
77 */
78
79 if (uvmexp.pagesize == 0) {
80 panic("uvm_init: page size not set");
81 }
82
83 /*
84 * step 1: zero the uvm structure
85 */
86
87 memset(&uvm, 0, sizeof(uvm));
88 averunnable.fscale = FSCALE;
89
90 /*
91 * step 2: init the page sub-system. this includes allocating the
92 * vm_page structures, and setting up all the page queues (and
93 * locks). available memory will be put in the "free" queue.
94 * kvm_start and kvm_end will be set to the area of kernel virtual
95 * memory which is available for general use.
96 */
97
98 uvm_page_init(&kvm_start, &kvm_end);
99
100 /*
101 * step 3: init the map sub-system. allocates the static pool of
102 * vm_map_entry structures that are used for "special" kernel maps
103 * (e.g. kernel_map, kmem_map, etc...).
104 */
105
106 uvm_map_init();
107
108 /*
109 * step 4: setup the kernel's virtual memory data structures. this
110 * includes setting up the kernel_map/kernel_object and the kmem_map/
111 * kmem_object.
112 */
113
114 uvm_km_init(kvm_start, kvm_end);
115
116 /*
117 * step 5: init the pmap module. the pmap module is free to allocate
118 * memory for its private use (e.g. pvlists).
119 */
120
121 pmap_init();
122
123 /*
124 * step 6: init the kernel memory allocator. after this call the
125 * kernel memory allocator (malloc) can be used.
126 */
127
128 kmeminit();
129
130 /*
131 * step 7: init all pagers and the pager_map.
132 */
133
134 uvm_pager_init();
135
136 /*
137 * step 8: init anonymous memory system
138 */
139
140 amap_init(); /* init amap module */
141
142 /*
143 * the VM system is now up! now that malloc is up we can resize the
144 * <obj,off> => <page> hash table for general use and enable paging
145 * of kernel objects.
146 */
147
148 uvm_page_rehash();
149 uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
150 UAO_FLAG_KERNSWAP);
151
152 uvm_km_page_init();
153
154 /*
155 * reserve some unmapped space for malloc/pool use after free usage
156 */
157 #ifdef DEADBEEF0
158 kvm_start = trunc_page(DEADBEEF0) - PAGE_SIZE;
159 if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE,
160 NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_NONE,
161 UVM_PROT_NONE, UVM_INH_NONE, UVM_ADV_RANDOM, UVM_FLAG_FIXED)))
162 panic("uvm_init: cannot reserve dead beef @0x%x\n", DEADBEEF0);
163 #endif
164 #ifdef DEADBEEF1
165 kvm_start = trunc_page(DEADBEEF1) - PAGE_SIZE;
166 if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE,
167 NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_NONE,
168 UVM_PROT_NONE, UVM_INH_NONE, UVM_ADV_RANDOM, UVM_FLAG_FIXED)))
169 panic("uvm_init: cannot reserve dead beef @0x%x\n", DEADBEEF1);
170 #endif
171 /*
172 * init anonymous memory systems
173 */
174 uvm_anon_init();
175 }