The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_init.c

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    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: src/sys/vm/vm_init.c,v 1.44.2.2 2005/04/28 00:29:24 kris Exp $");
   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/pipe.h>
   77 #include <sys/bio.h>
   78 #include <sys/buf.h>
   79 
   80 #include <vm/vm.h>
   81 #include <vm/vm_param.h>
   82 #include <vm/vm_kern.h>
   83 #include <vm/vm_object.h>
   84 #include <vm/vm_page.h>
   85 #include <vm/vm_map.h>
   86 #include <vm/vm_pager.h>
   87 #include <vm/vm_extern.h>
   88 
   89 long physmem;
   90 
   91 static int exec_map_entries = 16;
   92 TUNABLE_INT("vm.exec_map_entries", &exec_map_entries);
   93 SYSCTL_INT(_vm, OID_AUTO, exec_map_entries, CTLFLAG_RD, &exec_map_entries, 0,
   94     "Maximum number of simultaneous execs");
   95 
   96 /*
   97  * System initialization
   98  */
   99 static void vm_mem_init(void *);
  100 SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_FIRST, vm_mem_init, NULL)
  101 
  102 /*
  103  *      vm_init initializes the virtual memory system.
  104  *      This is done only by the first cpu up.
  105  *
  106  *      The start and end address of physical memory is passed in.
  107  */
  108 /* ARGSUSED*/
  109 static void
  110 vm_mem_init(dummy)
  111         void *dummy;
  112 {
  113         /*
  114          * Initializes resident memory structures. From here on, all physical
  115          * memory is accounted for, and we use only virtual addresses.
  116          */
  117         vm_set_page_size();
  118         virtual_avail = vm_page_startup(virtual_avail);
  119         
  120         /*
  121          * Initialize other VM packages
  122          */
  123         vm_object_init();
  124         vm_map_startup();
  125         kmem_init(virtual_avail, virtual_end);
  126         pmap_init();
  127         vm_pager_init();
  128 }
  129 
  130 void
  131 vm_ksubmap_init(struct kva_md_info *kmi)
  132 {
  133         vm_offset_t firstaddr;
  134         caddr_t v;
  135         vm_size_t size = 0;
  136         long physmem_est;
  137         vm_offset_t minaddr;
  138         vm_offset_t maxaddr;
  139         vm_map_t clean_map;
  140 
  141         /*
  142          * Allocate space for system data structures.
  143          * The first available kernel virtual address is in "v".
  144          * As pages of kernel virtual memory are allocated, "v" is incremented.
  145          * As pages of memory are allocated and cleared,
  146          * "firstaddr" is incremented.
  147          * An index into the kernel page table corresponding to the
  148          * virtual memory address maintained in "v" is kept in "mapaddr".
  149          */
  150 
  151         /*
  152          * Make two passes.  The first pass calculates how much memory is
  153          * needed and allocates it.  The second pass assigns virtual
  154          * addresses to the various data structures.
  155          */
  156         firstaddr = 0;
  157 again:
  158         v = (caddr_t)firstaddr;
  159 
  160         v = kern_timeout_callwheel_alloc(v);
  161 
  162         /*
  163          * Discount the physical memory larger than the size of kernel_map
  164          * to avoid eating up all of KVA space.
  165          */
  166         physmem_est = lmin(physmem, btoc(kernel_map->max_offset -
  167             kernel_map->min_offset));
  168 
  169         v = kern_vfs_bio_buffer_alloc(v, physmem_est);
  170 
  171         /*
  172          * End of first pass, size has been calculated so allocate memory
  173          */
  174         if (firstaddr == 0) {
  175                 size = (vm_size_t)v;
  176                 firstaddr = kmem_alloc(kernel_map, round_page(size));
  177                 if (firstaddr == 0)
  178                         panic("startup: no room for tables");
  179                 goto again;
  180         }
  181 
  182         /*
  183          * End of second pass, addresses have been assigned
  184          */
  185         if ((vm_size_t)((char *)v - firstaddr) != size)
  186                 panic("startup: table size inconsistency");
  187 
  188         clean_map = kmem_suballoc(kernel_map, &kmi->clean_sva, &kmi->clean_eva,
  189                         (nbuf*BKVASIZE) + (nswbuf*MAXPHYS));
  190         buffer_map = kmem_suballoc(clean_map, &kmi->buffer_sva,
  191                         &kmi->buffer_eva, (nbuf*BKVASIZE));
  192         buffer_map->system_map = 1;
  193         pager_map = kmem_suballoc(clean_map, &kmi->pager_sva, &kmi->pager_eva,
  194                                 (nswbuf*MAXPHYS));
  195         pager_map->system_map = 1;
  196         exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
  197                                 (exec_map_entries*(ARG_MAX+(PAGE_SIZE*3))));
  198         pipe_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, maxpipekva);
  199 
  200         /*
  201          * XXX: Mbuf system machine-specific initializations should
  202          *      go here, if anywhere.
  203          */
  204 
  205         /*
  206          * Initialize the callouts we just allocated.
  207          */
  208         kern_timeout_callwheel_init();
  209 }
  210 

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