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("$FreeBSD$"); 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/sysctl.h> 74 #include <sys/systm.h> 75 #include <sys/selinfo.h> 76 #include <sys/imgact.h> 77 #include <sys/pipe.h> 78 #include <sys/bio.h> 79 #include <sys/buf.h> 80 81 #include <vm/vm.h> 82 #include <vm/vm_param.h> 83 #include <vm/vm_kern.h> 84 #include <vm/vm_object.h> 85 #include <vm/vm_page.h> 86 #include <vm/vm_map.h> 87 #include <vm/vm_pager.h> 88 #include <vm/vm_extern.h> 89 90 long physmem; 91 92 static int exec_map_entries = 16; 93 TUNABLE_INT("vm.exec_map_entries", &exec_map_entries); 94 SYSCTL_INT(_vm, OID_AUTO, exec_map_entries, CTLFLAG_RD, &exec_map_entries, 0, 95 "Maximum number of simultaneous execs"); 96 97 /* 98 * System initialization 99 */ 100 static void vm_mem_init(void *); 101 SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_FIRST, vm_mem_init, NULL); 102 103 /* 104 * vm_init initializes the virtual memory system. 105 * This is done only by the first cpu up. 106 * 107 * The start and end address of physical memory is passed in. 108 */ 109 /* ARGSUSED*/ 110 static void 111 vm_mem_init(dummy) 112 void *dummy; 113 { 114 /* 115 * Initializes resident memory structures. From here on, all physical 116 * memory is accounted for, and we use only virtual addresses. 117 */ 118 vm_set_page_size(); 119 virtual_avail = vm_page_startup(virtual_avail); 120 121 /* 122 * Initialize other VM packages 123 */ 124 vm_object_init(); 125 vm_map_startup(); 126 kmem_init(virtual_avail, virtual_end); 127 pmap_init(); 128 vm_pager_init(); 129 } 130 131 void 132 vm_ksubmap_init(struct kva_md_info *kmi) 133 { 134 vm_offset_t firstaddr; 135 caddr_t v; 136 vm_size_t size = 0; 137 long physmem_est; 138 vm_offset_t minaddr; 139 vm_offset_t maxaddr; 140 vm_map_t clean_map; 141 142 /* 143 * Allocate space for system data structures. 144 * The first available kernel virtual address is in "v". 145 * As pages of kernel virtual memory are allocated, "v" is incremented. 146 * As pages of memory are allocated and cleared, 147 * "firstaddr" is incremented. 148 * An index into the kernel page table corresponding to the 149 * virtual memory address maintained in "v" is kept in "mapaddr". 150 */ 151 152 /* 153 * Make two passes. The first pass calculates how much memory is 154 * needed and allocates it. The second pass assigns virtual 155 * addresses to the various data structures. 156 */ 157 firstaddr = 0; 158 again: 159 v = (caddr_t)firstaddr; 160 161 v = kern_timeout_callwheel_alloc(v); 162 163 /* 164 * Discount the physical memory larger than the size of kernel_map 165 * to avoid eating up all of KVA space. 166 */ 167 physmem_est = lmin(physmem, btoc(kernel_map->max_offset - 168 kernel_map->min_offset)); 169 170 v = kern_vfs_bio_buffer_alloc(v, physmem_est); 171 172 /* 173 * End of first pass, size has been calculated so allocate memory 174 */ 175 if (firstaddr == 0) { 176 size = (vm_size_t)v; 177 firstaddr = kmem_alloc(kernel_map, round_page(size)); 178 if (firstaddr == 0) 179 panic("startup: no room for tables"); 180 goto again; 181 } 182 183 /* 184 * End of second pass, addresses have been assigned 185 */ 186 if ((vm_size_t)((char *)v - firstaddr) != size) 187 panic("startup: table size inconsistency"); 188 189 clean_map = kmem_suballoc(kernel_map, &kmi->clean_sva, &kmi->clean_eva, 190 (long)nbuf * BKVASIZE + (long)nswbuf * MAXPHYS, TRUE); 191 buffer_map = kmem_suballoc(clean_map, &kmi->buffer_sva, 192 &kmi->buffer_eva, (long)nbuf * BKVASIZE, FALSE); 193 buffer_map->system_map = 1; 194 pager_map = kmem_suballoc(clean_map, &kmi->pager_sva, &kmi->pager_eva, 195 (long)nswbuf * MAXPHYS, FALSE); 196 pager_map->system_map = 1; 197 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 198 exec_map_entries * round_page(PATH_MAX + ARG_MAX + MAXSHELLCMDLEN), 199 FALSE); 200 pipe_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, maxpipekva, 201 FALSE); 202 203 /* 204 * XXX: Mbuf system machine-specific initializations should 205 * go here, if anywhere. 206 */ 207 208 /* 209 * Initialize the callouts we just allocated. 210 */ 211 kern_timeout_callwheel_init(); 212 } 213 214