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  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)vm_init.c     8.1 (Berkeley) 6/11/93
   37  *
   38  *
   39  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   40  * All rights reserved.
   41  *
   42  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   43  *
   44  * Permission to use, copy, modify and distribute this software and
   45  * its documentation is hereby granted, provided that both the copyright
   46  * notice and this permission notice appear in all copies of the
   47  * software, derivative works or modified versions, and any portions
   48  * thereof, and that both notices appear in supporting documentation.
   49  *
   50  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   51  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   52  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   53  *
   54  * Carnegie Mellon requests users of this software to return to
   55  *
   56  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   57  *  School of Computer Science
   58  *  Carnegie Mellon University
   59  *  Pittsburgh PA 15213-3890
   60  *
   61  * any improvements or extensions that they make and grant Carnegie the
   62  * rights to redistribute these changes.
   63  *
   64  * $FreeBSD: releng/5.0/sys/vm/vm_init.c 106605 2002-11-07 23:57:17Z tmm $
   65  */
   66 
   67 /*
   68  *      Initialize the Virtual Memory subsystem.
   69  */
   70 
   71 #include <sys/param.h>
   72 #include <sys/kernel.h>
   73 #include <sys/lock.h>
   74 #include <sys/mutex.h>
   75 #include <sys/proc.h>
   76 #include <sys/systm.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 /*
   92  * System initialization
   93  */
   94 static void vm_mem_init(void *);
   95 SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_FIRST, vm_mem_init, NULL)
   96 
   97 /*
   98  *      vm_init initializes the virtual memory system.
   99  *      This is done only by the first cpu up.
  100  *
  101  *      The start and end address of physical memory is passed in.
  102  */
  103 /* ARGSUSED*/
  104 static void
  105 vm_mem_init(dummy)
  106         void *dummy;
  107 {
  108         /*
  109          * Initializes resident memory structures. From here on, all physical
  110          * memory is accounted for, and we use only virtual addresses.
  111          */
  112         vm_set_page_size();
  113         virtual_avail = vm_page_startup(avail_start, avail_end, virtual_avail);
  114         
  115         /*
  116          * Initialize other VM packages
  117          */
  118         vm_object_init();
  119         vm_map_startup();
  120         kmem_init(virtual_avail, virtual_end);
  121         pmap_init(avail_start, avail_end);
  122         vm_pager_init();
  123 }
  124 
  125 void
  126 vm_ksubmap_init(struct kva_md_info *kmi)
  127 {
  128         vm_offset_t firstaddr;
  129         caddr_t v;
  130         vm_size_t size = 0;
  131         long physmem_est;
  132         vm_offset_t minaddr;
  133         vm_offset_t maxaddr;
  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         if (kernel_map->first_free == NULL) {
  161                 printf("Warning: no free entries in kernel_map.\n");
  162                 physmem_est = physmem;
  163         } else {
  164                 physmem_est = lmin(physmem, btoc(kernel_map->max_offset -
  165                     kernel_map->min_offset));
  166         }
  167 
  168         v = kern_vfs_bio_buffer_alloc(v, physmem_est);
  169 
  170         /*
  171          * End of first pass, size has been calculated so allocate memory
  172          */
  173         if (firstaddr == 0) {
  174                 size = (vm_size_t)((char *)v - firstaddr);
  175                 firstaddr = kmem_alloc(kernel_map, round_page(size));
  176                 if (firstaddr == 0)
  177                         panic("startup: no room for tables");
  178                 goto again;
  179         }
  180 
  181         /*
  182          * End of second pass, addresses have been assigned
  183          */
  184         if ((vm_size_t)((char *)v - firstaddr) != size)
  185                 panic("startup: table size inconsistency");
  186 
  187         clean_map = kmem_suballoc(kernel_map, &kmi->clean_sva, &kmi->clean_eva,
  188                         (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
  189         buffer_map = kmem_suballoc(clean_map, &kmi->buffer_sva,
  190                         &kmi->buffer_eva, (nbuf*BKVASIZE));
  191         buffer_map->system_map = 1;
  192         pager_map = kmem_suballoc(clean_map, &kmi->pager_sva, &kmi->pager_eva,
  193                                 (nswbuf*MAXPHYS) + pager_map_size);
  194         pager_map->system_map = 1;
  195         exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
  196                                 (16*(ARG_MAX+(PAGE_SIZE*3))));
  197 
  198         /*
  199          * XXX: Mbuf system machine-specific initializations should
  200          *      go here, if anywhere.
  201          */
  202 
  203         /*
  204          * Initialize the callouts we just allocated.
  205          */
  206         kern_timeout_callwheel_init();
  207 }
  208 

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