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uvm_init.c revision 1.12 
      1 /*	$NetBSD: uvm_init.c,v 1.12 2000/03/29 03:43:34 simonb Exp $	*/
      2 
      3 /*
      4  *
      5  * Copyright (c) 1997 Charles D. Cranor and Washington University.
      6  * All rights reserved.
      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 Charles D. Cranor and
     19  *      Washington University.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  *
     34  * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
     35  */
     36 
     37 /*
     38  * uvm_init.c: init the vm system.
     39  */
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/file.h>
     44 #include <sys/filedesc.h>
     45 #include <sys/resourcevar.h>
     46 #include <sys/mman.h>
     47 #include <sys/proc.h>
     48 #include <sys/malloc.h>
     49 #include <sys/vnode.h>
     50 
     51 
     52 #include <vm/vm.h>
     53 #include <vm/vm_page.h>
     54 #include <vm/vm_kern.h>
     55 
     56 #include <uvm/uvm.h>
     57 
     58 /*
     59  * struct uvm: we store all global vars in this structure to make them
     60  * easier to spot...
     61  */
     62 
     63 struct uvm uvm;		/* decl */
     64 struct uvmexp uvmexp;	/* decl */
     65 
     66 /*
     67  * local prototypes
     68  */
     69 
     70 /*
     71  * uvm_init: init the VM system.   called from kern/init_main.c.
     72  */
     73 
     74 void
     75 uvm_init()
     76 {
     77 	vaddr_t kvm_start, kvm_end;
     78 
     79 	/*
     80 	 * step 0: ensure that the hardware set the page size
     81 	 */
     82 
     83 	if (uvmexp.pagesize == 0) {
     84 		panic("uvm_init: page size not set");
     85 	}
     86 
     87 	/*
     88 	 * step 1: zero the uvm structure
     89 	 */
     90 
     91 	memset(&uvm, 0, sizeof(uvm));
     92 	averunnable.fscale = FSCALE;
     93 
     94 	/*
     95 	 * step 2: init the page sub-system.  this includes allocating the
     96 	 * vm_page structures, and setting up all the page queues (and
     97 	 * locks).  available memory will be put in the "free" queue.
     98 	 * kvm_start and kvm_end will be set to the area of kernel virtual
     99 	 * memory which is available for general use.
    100 	 */
    101 
    102 	uvm_page_init(&kvm_start, &kvm_end);
    103 
    104 	/*
    105 	 * step 3: init the map sub-system.  allocates the static pool of
    106 	 * vm_map_entry structures that are used for "special" kernel maps
    107 	 * (e.g. kernel_map, kmem_map, etc...).
    108 	 */
    109 
    110 	uvm_map_init();
    111 
    112 	/*
    113 	 * step 4: setup the kernel's virtual memory data structures.  this
    114 	 * includes setting up the kernel_map/kernel_object and the kmem_map/
    115 	 * kmem_object.
    116 	 */
    117 
    118 	uvm_km_init(kvm_start, kvm_end);
    119 
    120 	/*
    121 	 * step 5: init the pmap module.   the pmap module is free to allocate
    122 	 * memory for its private use (e.g. pvlists).
    123 	 */
    124 
    125 	pmap_init();
    126 
    127 	/*
    128 	 * step 6: init the kernel memory allocator.   after this call the
    129 	 * kernel memory allocator (malloc) can be used.
    130 	 */
    131 
    132 	kmeminit();
    133 
    134 	/*
    135 	 * step 7: init all pagers and the pager_map.
    136 	 */
    137 
    138 	uvm_pager_init();
    139 
    140 	/*
    141 	 * step 8: init anonymous memory systems (both amap and anons)
    142 	 */
    143 
    144 	amap_init();		/* init amap module */
    145 	uvm_anon_init();	/* allocate initial anons */
    146 
    147 	/*
    148 	 * the VM system is now up!  now that malloc is up we can resize the
    149 	 * <obj,off> => <page> hash table for general use and enable paging
    150 	 * of kernel objects.
    151 	 */
    152 
    153 	uvm_page_rehash();
    154 	uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
    155 	    UAO_FLAG_KERNSWAP);
    156 
    157 	/*
    158 	 * done!
    159 	 */
    160 
    161 	return;
    162 }
    163