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uvm_init.c revision 1.34 
      1 /*	$NetBSD: uvm_init.c,v 1.34 2008/10/18 03:46:22 rmind 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/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: uvm_init.c,v 1.34 2008/10/18 03:46:22 rmind Exp $");
     43 
     44 #include <sys/param.h>
     45 #include <sys/systm.h>
     46 #include <sys/debug.h>
     47 #include <sys/file.h>
     48 #include <sys/filedesc.h>
     49 #include <sys/resourcevar.h>
     50 #include <sys/kmem.h>
     51 #include <sys/mman.h>
     52 #include <sys/proc.h>
     53 #include <sys/malloc.h>
     54 #include <sys/vnode.h>
     55 
     56 #include <uvm/uvm.h>
     57 #include <uvm/uvm_pdpolicy.h>
     58 #include <uvm/uvm_readahead.h>
     59 
     60 /*
     61  * struct uvm: we store most global vars in this structure to make them
     62  * easier to spot...
     63  */
     64 
     65 struct uvm uvm;		/* decl */
     66 struct uvmexp uvmexp;	/* decl */
     67 struct uvm_object *uvm_kernel_object;
     68 
     69 kmutex_t uvm_pageqlock;
     70 kmutex_t uvm_fpageqlock;
     71 kmutex_t uvm_kentry_lock;
     72 kmutex_t uvm_swap_data_lock;
     73 kmutex_t uvm_scheduler_mutex;
     74 
     75 /*
     76  * uvm_init: init the VM system.   called from kern/init_main.c.
     77  */
     78 
     79 void
     80 uvm_init(void)
     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 	uvm_amap_init();
     99 
    100 	/*
    101 	 * step 2: init the page sub-system.  this includes allocating the
    102 	 * vm_page structures, and setting up all the page queues (and
    103 	 * locks).  available memory will be put in the "free" queue.
    104 	 * kvm_start and kvm_end will be set to the area of kernel virtual
    105 	 * memory which is available for general use.
    106 	 */
    107 
    108 	uvm_page_init(&kvm_start, &kvm_end);
    109 
    110 	/*
    111 	 * step 3: init the map sub-system.  allocates the static pool of
    112 	 * vm_map_entry structures that are used for "special" kernel maps
    113 	 * (e.g. kernel_map, kmem_map, etc...).
    114 	 */
    115 
    116 	uvm_map_init();
    117 
    118 	/*
    119 	 * step 4: setup the kernel's virtual memory data structures.  this
    120 	 * includes setting up the kernel_map/kernel_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. this includes
    135 	 * setting up the kmem_map.
    136 	 */
    137 
    138 	kmeminit();
    139 
    140 #ifdef DEBUG
    141 	debug_init();
    142 #endif
    143 
    144 	/*
    145 	 * step 7: init all pagers and the pager_map.
    146 	 */
    147 
    148 	uvm_pager_init();
    149 
    150 	/*
    151 	 * step 8: init the uvm_loan() facility.
    152 	 */
    153 
    154 	uvm_loan_init();
    155 
    156 	/*
    157 	 * Initialize pools.  This must be done before anyone manipulates
    158 	 * any vm_maps because we use a pool for some map entry structures.
    159 	 */
    160 
    161 	pool_subsystem_init();
    162 
    163 	/*
    164 	 * init slab memory allocator kmem(9).
    165 	 */
    166 
    167 	kmem_init();
    168 
    169 	/*
    170 	 * the VM system is now up!  now that kmem is up we can resize the
    171 	 * <obj,off> => <page> hash table for general use and enable paging
    172 	 * of kernel objects.
    173 	 */
    174 
    175 	uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
    176 	    UAO_FLAG_KERNSWAP);
    177 
    178 	uvmpdpol_reinit();
    179 
    180 	/*
    181 	 * init anonymous memory systems
    182 	 */
    183 
    184 	uvm_anon_init();
    185 
    186 	uvm_uarea_init();
    187 
    188 	/*
    189 	 * init readahead module
    190 	 */
    191 
    192 	uvm_ra_init();
    193 }
    194