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uvm_init.c revision 1.41.4.2 
      1 /*	$NetBSD: uvm_init.c,v 1.41.4.2 2012/04/17 00:08:58 yamt 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 1.41.4.2 2012/04/17 00:08:58 yamt 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/mutex.h>
     46 #include <sys/rwlock.h>
     47 #include <sys/vnode.h>
     48 
     49 #include <uvm/uvm.h>
     50 #include <uvm/uvm_pdpolicy.h>
     51 #include <uvm/uvm_readahead.h>
     52 
     53 /*
     54  * struct uvm: we store most global vars in this structure to make them
     55  * easier to spot...
     56  */
     57 
     58 struct uvm uvm;		/* decl */
     59 struct uvmexp uvmexp;	/* decl */
     60 struct uvm_object *uvm_kernel_object;
     61 
     62 #if defined(__uvmexp_pagesize)
     63 const int * const uvmexp_pagesize = &uvmexp.pagesize;
     64 const int * const uvmexp_pagemask = &uvmexp.pagemask;
     65 const int * const uvmexp_pageshift = &uvmexp.pageshift;
     66 #endif
     67 
     68 kmutex_t uvm_pageqlock;
     69 kmutex_t uvm_fpageqlock;
     70 kmutex_t uvm_kentry_lock;
     71 kmutex_t uvm_swap_data_lock;
     72 
     73 /*
     74  * uvm_init: init the VM system.   called from kern/init_main.c.
     75  */
     76 
     77 void
     78 uvm_init(void)
     79 {
     80 	vaddr_t kvm_start, kvm_end;
     81 
     82 	/*
     83 	 * Ensure that the hardware set the page size, zero the UVM structure.
     84 	 */
     85 
     86 	if (uvmexp.pagesize == 0) {
     87 		panic("uvm_init: page size not set");
     88 	}
     89 
     90 	memset(&uvm, 0, sizeof(uvm));
     91 	averunnable.fscale = FSCALE;
     92 
     93 	/*
     94 	 * Init the page sub-system.  This includes allocating the vm_page
     95 	 * structures, and setting up all the page queues (and locks).
     96 	 * Available memory will be put in the "free" queue, kvm_start and
     97 	 * kvm_end will be set to the area of kernel virtual memory which
     98 	 * is available for general use.
     99 	 */
    100 
    101 	uvm_page_init(&kvm_start, &kvm_end);
    102 
    103 	/*
    104 	 * Init the map sub-system.
    105 	 */
    106 
    107 	uvm_map_init();
    108 
    109 	/*
    110 	 * Setup the kernel's virtual memory data structures.  This includes
    111 	 * setting up the kernel_map/kernel_object.  Bootstrap all kernel
    112 	 * memory allocators.
    113 	 */
    114 
    115 	uao_init();
    116 	uvm_km_bootstrap(kvm_start, kvm_end);
    117 
    118 	/*
    119 	 * Setup uvm_map caches and init the amap.
    120 	 */
    121 
    122 	uvm_map_init_caches();
    123 	uvm_amap_init();
    124 
    125 	/*
    126 	 * 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 	 * Init the kernel maps virtual address caches.  Make kernel memory
    134 	 * allocator ready for use.  After this call the pool/kmem memory
    135 	 * allocators can be used.
    136 	 */
    137 
    138 	uvm_km_init();
    139 
    140 #ifdef DEBUG
    141 	debug_init();
    142 #endif
    143 
    144 	/*
    145 	 * Init all pagers and the pager_map.
    146 	 */
    147 
    148 	uvm_pager_init();
    149 
    150 	/*
    151 	 * Initialize lock caches.
    152 	 */
    153 
    154 	mutex_obj_init();
    155 	rw_obj_init();
    156 
    157 	/*
    158 	 * Initialize the uvm_loan() facility.
    159 	 * REQUIRE: mutex_obj_init
    160 	 */
    161 
    162 	uvm_loan_init();
    163 
    164 	/*
    165 	 * Init emap subsystem.
    166 	 */
    167 
    168 	uvm_emap_sysinit();
    169 
    170 	/*
    171 	 * The VM system is now up!  Now that kmem is up we can resize the
    172 	 * <obj,off> => <page> hash table for general use and enable paging
    173 	 * of kernel objects.
    174 	 */
    175 
    176 	uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
    177 	    UAO_FLAG_KERNSWAP);
    178 
    179 	uvmpdpol_reinit();
    180 
    181 	/*
    182 	 * Init anonymous memory systems.
    183 	 */
    184 
    185 	uvm_anon_init();
    186 
    187 	uvm_uarea_init();
    188 
    189 	/*
    190 	 * Init readahead mechanism.
    191 	 */
    192 
    193 	uvm_ra_init();
    194 }
    195