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uvm_init.c revision 1.42 
      1 /*	$NetBSD: uvm_init.c,v 1.42 2012/01/27 19:48:41 para Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Charles D. Cranor and Washington University.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  *
     27  * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
     28  */
     29 
     30 /*
     31  * uvm_init.c: init the vm system.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: uvm_init.c,v 1.42 2012/01/27 19:48:41 para Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/debug.h>
     40 #include <sys/file.h>
     41 #include <sys/filedesc.h>
     42 #include <sys/resourcevar.h>
     43 #include <sys/kmem.h>
     44 #include <sys/mman.h>
     45 #include <sys/vnode.h>
     46 
     47 #include <uvm/uvm.h>
     48 #include <uvm/uvm_pdpolicy.h>
     49 #include <uvm/uvm_readahead.h>
     50 
     51 /*
     52  * struct uvm: we store most global vars in this structure to make them
     53  * easier to spot...
     54  */
     55 
     56 struct uvm uvm;		/* decl */
     57 struct uvmexp uvmexp;	/* decl */
     58 struct uvm_object *uvm_kernel_object;
     59 
     60 #if defined(__uvmexp_pagesize)
     61 int *uvmexp_pagesize = &uvmexp.pagesize;
     62 int *uvmexp_pagemask = &uvmexp.pagemask;
     63 int *uvmexp_pageshift = &uvmexp.pageshift;
     64 #endif
     65 
     66 kmutex_t uvm_pageqlock;
     67 kmutex_t uvm_fpageqlock;
     68 kmutex_t uvm_kentry_lock;
     69 kmutex_t uvm_swap_data_lock;
     70 
     71 /*
     72  * uvm_init: init the VM system.   called from kern/init_main.c.
     73  */
     74 
     75 void
     76 uvm_init(void)
     77 {
     78 	vaddr_t kvm_start, kvm_end;
     79 
     80 	/*
     81 	 * step 0: ensure that the hardware set the page size
     82 	 */
     83 
     84 	if (uvmexp.pagesize == 0) {
     85 		panic("uvm_init: page size not set");
     86 	}
     87 
     88 	/*
     89 	 * step 1: zero the uvm structure
     90 	 */
     91 
     92 	memset(&uvm, 0, sizeof(uvm));
     93 	averunnable.fscale = FSCALE;
     94 
     95 	/*
     96 	 * step 2: init the page sub-system.  this includes allocating the
     97 	 * vm_page structures, and setting up all the page queues (and
     98 	 * locks).  available memory will be put in the "free" queue.
     99 	 * kvm_start and kvm_end will be set to the area of kernel virtual
    100 	 * memory which is available for general use.
    101 	 */
    102 
    103 	uvm_page_init(&kvm_start, &kvm_end);
    104 
    105 	/*
    106 	 * step 3: init the map sub-system.
    107 	 */
    108 
    109 	uvm_map_init();
    110 
    111 	/*
    112 	 * step 4: setup the kernel's virtual memory data structures.  this
    113 	 * includes setting up the kernel_map/kernel_object.
    114 	 * Bootstrap all kernel memory allocators.
    115 	 */
    116 
    117 	uao_init();
    118 	uvm_km_bootstrap(kvm_start, kvm_end);
    119 
    120 	/*
    121 	 * step 5: setup uvm_map pool_caches and init the amap.
    122 	 */
    123 
    124 	uvm_map_init_caches();
    125 	uvm_amap_init();
    126 
    127 	/*
    128 	 * step 5: init the pmap module.   the pmap module is free to allocate
    129 	 * memory for its private use (e.g. pvlists).
    130 	 */
    131 
    132 	pmap_init();
    133 
    134 	/* step 6: init the kernel maps virtual address caches.
    135 	 * make kernel memory allocator ready for use.
    136          * After this call the pool/kmem memory allocators can be used.
    137 	 */
    138 
    139 	uvm_km_init();
    140 
    141 #ifdef DEBUG
    142 	debug_init();
    143 #endif
    144 
    145 	/*
    146 	 * step 6: init all pagers and the pager_map.
    147 	 */
    148 
    149 	uvm_pager_init();
    150 
    151 	/*
    152 	 * Initialize the uvm_loan() facility.
    153 	 */
    154 
    155 	uvm_loan_init();
    156 
    157 	/*
    158 	 * init emap subsystem.
    159 	 */
    160 
    161 	uvm_emap_sysinit();
    162 
    163 	/*
    164 	 * the VM system is now up!  now that kmem is up we can resize the
    165 	 * <obj,off> => <page> hash table for general use and enable paging
    166 	 * of kernel objects.
    167 	 */
    168 
    169 	uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
    170 	    UAO_FLAG_KERNSWAP);
    171 
    172 	uvmpdpol_reinit();
    173 
    174 	/*
    175 	 * init anonymous memory systems
    176 	 */
    177 
    178 	uvm_anon_init();
    179 
    180 	uvm_uarea_init();
    181 
    182 	/*
    183 	 * init readahead module
    184 	 */
    185 
    186 	uvm_ra_init();
    187 }
    188