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uvm_init.c revision 1.9 
      1 /*	$NetBSD: uvm_init.c,v 1.9 1998/08/13 02:11:00 eeh Exp $	*/
      2 
      3 /*
      4  * XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE!
      5  *	   >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<<
      6  */
      7 /*
      8  *
      9  * Copyright (c) 1997 Charles D. Cranor and Washington University.
     10  * All rights reserved.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *      This product includes software developed by Charles D. Cranor and
     23  *      Washington University.
     24  * 4. The name of the author may not be used to endorse or promote products
     25  *    derived from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     28  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     29  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     30  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     31  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     32  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     33  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     34  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     35  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     36  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     37  *
     38  * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
     39  */
     40 
     41 /*
     42  * uvm_init.c: init the vm system.
     43  */
     44 
     45 #include <sys/param.h>
     46 #include <sys/systm.h>
     47 #include <sys/file.h>
     48 #include <sys/filedesc.h>
     49 #include <sys/resourcevar.h>
     50 #include <sys/mman.h>
     51 #include <sys/proc.h>
     52 #include <sys/malloc.h>
     53 #include <sys/vnode.h>
     54 #include <sys/conf.h>
     55 
     56 
     57 #include <vm/vm.h>
     58 #include <vm/vm_page.h>
     59 #include <vm/vm_kern.h>
     60 
     61 #include <uvm/uvm.h>
     62 
     63 /*
     64  * struct uvm: we store all global vars in this structure to make them
     65  * easier to spot...
     66  */
     67 
     68 struct uvm uvm;		/* decl */
     69 struct uvmexp uvmexp;	/* decl */
     70 
     71 /*
     72  * local prototypes
     73  */
     74 
     75 /*
     76  * uvm_init: init the VM system.   called from kern/init_main.c.
     77  */
     78 
     79 void
     80 uvm_init()
     81 {
     82 	vaddr_t kvm_start, kvm_end;
     83 
     84 	/*
     85 	 * step 0: ensure that the hardware set the page size
     86 	 */
     87 
     88 	if (uvmexp.pagesize == 0) {
     89 		panic("uvm_init: page size not set");
     90 	}
     91 
     92 	/*
     93 	 * step 1: zero the uvm structure
     94 	 */
     95 
     96 	memset(&uvm, 0, sizeof(uvm));
     97 	averunnable.fscale = FSCALE;
     98 
     99 	/*
    100 	 * step 2: init the page sub-system.  this includes allocating the
    101 	 * vm_page structures, and setting up all the page queues (and
    102 	 * locks).  available memory will be put in the "free" queue.
    103 	 * kvm_start and kvm_end will be set to the area of kernel virtual
    104 	 * memory which is available for general use.
    105 	 */
    106 
    107 	uvm_page_init(&kvm_start, &kvm_end);
    108 
    109 	/*
    110 	 * step 3: init the map sub-system.  allocates the static pool of
    111 	 * vm_map_entry structures that are used for "special" kernel maps
    112 	 * (e.g. kernel_map, kmem_map, etc...).
    113 	 */
    114 
    115 	uvm_map_init();
    116 
    117 	/*
    118 	 * step 4: setup the kernel's virtual memory data structures.  this
    119 	 * includes setting up the kernel_map/kernel_object and the kmem_map/
    120 	 * kmem_object.
    121 	 */
    122 
    123 	uvm_km_init(kvm_start, kvm_end);
    124 
    125 	/*
    126 	 * step 5: init the pmap module.   the pmap module is free to allocate
    127 	 * memory for its private use (e.g. pvlists).
    128 	 */
    129 
    130 	pmap_init();
    131 
    132 	/*
    133 	 * step 6: init the kernel memory allocator.   after this call the
    134 	 * kernel memory allocator (malloc) can be used.
    135 	 */
    136 
    137 	kmeminit();
    138 
    139 	/*
    140 	 * step 7: init all pagers and the pager_map.
    141 	 */
    142 
    143 	uvm_pager_init();
    144 
    145 	/*
    146 	 * step 8: allocate anons (can add more as we add swap... later)
    147 	 */
    148 
    149 	uvm_anon_init();
    150 
    151 	/*
    152 	 * the VM system is now up!  now that malloc is up we can resize the
    153 	 * <obj,off> => <page> hash table for general use and enable paging
    154 	 * of kernel objects.
    155 	 */
    156 
    157 	uvm_page_rehash();
    158 	uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
    159 	    UAO_FLAG_KERNSWAP);
    160 
    161 	/*
    162 	 * done!
    163 	 */
    164 
    165 	return;
    166 }
    167