1 /* $NetBSD: uvm_init.c,v 1.59 2023/09/23 18:21:12 ad Exp $ */
2
3 /*
4 * Copyright (c) 1997 Charles D. Cranor and Washington University.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
28 */
29
30 /*
31 * uvm_init.c: init the vm system.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: uvm_init.c,v 1.59 2023/09/23 18:21:12 ad Exp $");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/debug.h>
40 #include <sys/file.h>
41 #include <sys/filedesc.h>
42 #include <sys/resourcevar.h>
43 #include <sys/kmem.h>
44 #include <sys/mman.h>
45 #include <sys/vnode.h>
46 #include <sys/rndsource.h>
47
48 #include <uvm/uvm.h>
49 #include <uvm/uvm_pdpolicy.h>
50 #include <uvm/uvm_physseg.h>
51 #include <uvm/uvm_readahead.h>
52 #include <uvm/uvm_rndsource.h>
53
54 /*
55 * struct uvm: we store most 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 struct uvm_object *uvm_kernel_object;
62
63 #if defined(__uvmexp_pagesize)
64 const int * const uvmexp_pagesize = &uvmexp.pagesize;
65 const int * const uvmexp_pagemask = &uvmexp.pagemask;
66 const int * const uvmexp_pageshift = &uvmexp.pageshift;
67 #endif
68
69 kmutex_t uvm_kentry_lock __cacheline_aligned;
70
71 struct krndsource uvm_fault_rndsource;
72
73 /*
74 * uvm_md_init: Init dependant on the MD boot context.
75 * called from MD code.
76 */
77
78 void
uvm_md_init(void)79 uvm_md_init(void)
80 {
81 uvm_setpagesize(); /* initialize PAGE_SIZE-dependent variables */
82 uvm_physseg_init();
83 }
84
85 /*
86 * uvm_init: init the VM system. called from kern/init_main.c.
87 */
88
89 void
uvm_init(void)90 uvm_init(void)
91 {
92 vaddr_t kvm_start, kvm_end;
93
94 /*
95 * Ensure that the hardware set the page size, zero the UVM structure.
96 */
97
98 if (uvmexp.pagesize == 0) {
99 panic("uvm_init: page size not set");
100 }
101
102 memset(&uvm, 0, sizeof(uvm));
103 averunnable.fscale = FSCALE;
104
105 /*
106 * Init the page sub-system. This includes allocating the vm_page
107 * structures, and setting up all the page queues (and locks).
108 * Available memory will be put in the "free" queue, kvm_start and
109 * kvm_end will be set to the area of kernel virtual memory which
110 * is available for general use.
111 */
112
113 uvm_page_init(&kvm_start, &kvm_end);
114 uvm_pglistalloc_init();
115
116 /*
117 * Init the map sub-system.
118 */
119
120 uvm_map_init();
121
122 /*
123 * Setup the kernel's virtual memory data structures. This includes
124 * setting up the kernel_map/kernel_object.
125 * Bootstrap all kernel memory allocators.
126 */
127
128 uao_init();
129 uvm_km_bootstrap(kvm_start, kvm_end);
130
131 /*
132 * Setup uvm_map caches and init the amap.
133 */
134
135 uvm_map_init_caches();
136 uvm_amap_init();
137
138 /*
139 * Init the pmap module. The pmap module is free to allocate
140 * memory for its private use (e.g. pvlists).
141 */
142
143 pmap_init();
144
145 /*
146 * Make kernel memory allocators ready for use.
147 * After this call the pool/kmem memory allocators can be used.
148 */
149
150 uvm_km_init();
151 #ifdef __HAVE_PMAP_PV_TRACK
152 pmap_pv_init();
153 #endif
154
155 #ifdef DEBUG
156 debug_init();
157 #endif
158
159 /*
160 * Init all pagers and the pager_map.
161 */
162
163 uvm_pager_init();
164
165 /*
166 * Initialize the uvm_loan() facility.
167 */
168
169 uvm_loan_init();
170
171 /*
172 * Enable paging of kernel objects.
173 * This second pass of initializing kernel_object requires rw_obj,
174 * so initialize that first.
175 */
176
177 uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
178 UAO_FLAG_KERNSWAP);
179
180 uvmpdpol_reinit();
181
182 /*
183 * Init anonymous memory systems.
184 */
185
186 uvm_anon_init();
187
188 uvm_uarea_init();
189
190 /*
191 * Init readahead mechanism.
192 */
193
194 uvm_ra_init();
195
196 /*
197 * Initialize random source for page fault events.
198 */
199
200 rnd_attach_source(&uvm_fault_rndsource, "uvmfault", RND_TYPE_VM,
201 RND_FLAG_COLLECT_TIME|RND_FLAG_COLLECT_VALUE|
202 RND_FLAG_ESTIMATE_VALUE);
203 }
204