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
uvm_init(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
uvm_init_percpu(void)194 uvm_init_percpu(void)
195 {
196 uvmexp_counters = counters_alloc_ncpus(uvmexp_counters, exp_ncounters);
197 }
198