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
59struct uvm uvm;		/* decl */
60struct uvmexp uvmexp;	/* decl */
61struct uvm_object *uvm_kernel_object;
62
63#if defined(__uvmexp_pagesize)
64const int * const uvmexp_pagesize = &uvmexp.pagesize;
65const int * const uvmexp_pagemask = &uvmexp.pagemask;
66const int * const uvmexp_pageshift = &uvmexp.pageshift;
67#endif
68
69kmutex_t uvm_kentry_lock __cacheline_aligned;
70
71struct krndsource uvm_fault_rndsource;
72
73/*
74 * uvm_md_init: Init dependant on the MD boot context.
75 *		called from MD code.
76 */
77
78void
79uvm_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
89void
90uvm_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