FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_init.c
1 /*
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * The Mach Operating System project at Carnegie-Mellon University.
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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from: @(#)vm_init.c 8.1 (Berkeley) 6/11/93
33 *
34 *
35 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
36 * All rights reserved.
37 *
38 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
39 *
40 * Permission to use, copy, modify and distribute this software and
41 * its documentation is hereby granted, provided that both the copyright
42 * notice and this permission notice appear in all copies of the
43 * software, derivative works or modified versions, and any portions
44 * thereof, and that both notices appear in supporting documentation.
45 *
46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
49 *
50 * Carnegie Mellon requests users of this software to return to
51 *
52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
53 * School of Computer Science
54 * Carnegie Mellon University
55 * Pittsburgh PA 15213-3890
56 *
57 * any improvements or extensions that they make and grant Carnegie the
58 * rights to redistribute these changes.
59 */
60
61 /*
62 * Initialize the Virtual Memory subsystem.
63 */
64
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD: releng/5.3/sys/vm/vm_init.c 133253 2004-08-07 05:58:31Z alc $");
67
68 #include <sys/param.h>
69 #include <sys/kernel.h>
70 #include <sys/lock.h>
71 #include <sys/mutex.h>
72 #include <sys/proc.h>
73 #include <sys/systm.h>
74 #include <sys/selinfo.h>
75 #include <sys/pipe.h>
76 #include <sys/bio.h>
77 #include <sys/buf.h>
78
79 #include <vm/vm.h>
80 #include <vm/vm_param.h>
81 #include <vm/vm_kern.h>
82 #include <vm/vm_object.h>
83 #include <vm/vm_page.h>
84 #include <vm/vm_map.h>
85 #include <vm/vm_pager.h>
86 #include <vm/vm_extern.h>
87
88 long physmem;
89
90 /*
91 * System initialization
92 */
93 static void vm_mem_init(void *);
94 SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_FIRST, vm_mem_init, NULL)
95
96 /*
97 * vm_init initializes the virtual memory system.
98 * This is done only by the first cpu up.
99 *
100 * The start and end address of physical memory is passed in.
101 */
102 /* ARGSUSED*/
103 static void
104 vm_mem_init(dummy)
105 void *dummy;
106 {
107 /*
108 * Initializes resident memory structures. From here on, all physical
109 * memory is accounted for, and we use only virtual addresses.
110 */
111 vm_set_page_size();
112 virtual_avail = vm_page_startup(virtual_avail);
113
114 /*
115 * Initialize other VM packages
116 */
117 vm_object_init();
118 vm_map_startup();
119 kmem_init(virtual_avail, virtual_end);
120 pmap_init();
121 vm_pager_init();
122 }
123
124 void
125 vm_ksubmap_init(struct kva_md_info *kmi)
126 {
127 vm_offset_t firstaddr;
128 caddr_t v;
129 vm_size_t size = 0;
130 long physmem_est;
131 vm_offset_t minaddr;
132 vm_offset_t maxaddr;
133 vm_map_t clean_map;
134
135 /*
136 * Allocate space for system data structures.
137 * The first available kernel virtual address is in "v".
138 * As pages of kernel virtual memory are allocated, "v" is incremented.
139 * As pages of memory are allocated and cleared,
140 * "firstaddr" is incremented.
141 * An index into the kernel page table corresponding to the
142 * virtual memory address maintained in "v" is kept in "mapaddr".
143 */
144
145 /*
146 * Make two passes. The first pass calculates how much memory is
147 * needed and allocates it. The second pass assigns virtual
148 * addresses to the various data structures.
149 */
150 firstaddr = 0;
151 again:
152 v = (caddr_t)firstaddr;
153
154 v = kern_timeout_callwheel_alloc(v);
155
156 /*
157 * Discount the physical memory larger than the size of kernel_map
158 * to avoid eating up all of KVA space.
159 */
160 physmem_est = lmin(physmem, btoc(kernel_map->max_offset -
161 kernel_map->min_offset));
162
163 v = kern_vfs_bio_buffer_alloc(v, physmem_est);
164
165 /*
166 * End of first pass, size has been calculated so allocate memory
167 */
168 if (firstaddr == 0) {
169 size = (vm_size_t)v;
170 firstaddr = kmem_alloc(kernel_map, round_page(size));
171 if (firstaddr == 0)
172 panic("startup: no room for tables");
173 goto again;
174 }
175
176 /*
177 * End of second pass, addresses have been assigned
178 */
179 if ((vm_size_t)((char *)v - firstaddr) != size)
180 panic("startup: table size inconsistency");
181
182 clean_map = kmem_suballoc(kernel_map, &kmi->clean_sva, &kmi->clean_eva,
183 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS));
184 buffer_map = kmem_suballoc(clean_map, &kmi->buffer_sva,
185 &kmi->buffer_eva, (nbuf*BKVASIZE));
186 buffer_map->system_map = 1;
187 pager_map = kmem_suballoc(clean_map, &kmi->pager_sva, &kmi->pager_eva,
188 (nswbuf*MAXPHYS));
189 pager_map->system_map = 1;
190 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
191 (16*(ARG_MAX+(PAGE_SIZE*3))));
192 pipe_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, maxpipekva);
193
194 /*
195 * XXX: Mbuf system machine-specific initializations should
196 * go here, if anywhere.
197 */
198
199 /*
200 * Initialize the callouts we just allocated.
201 */
202 kern_timeout_callwheel_init();
203 }
204
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