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uvm_init.c revision 1.44 
      1 /*	$NetBSD: uvm_init.c,v 1.44 2012/02/17 23:41:02 matt 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 1.44 2012/02/17 23:41:02 matt 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 const int * const uvmexp_pagesize = &uvmexp.pagesize;
     62 const int * const uvmexp_pagemask = &uvmexp.pagemask;
     63 const int * const 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 	 * Ensure that the hardware set the page size, zero the UVM structure.
     82 	 */
     83 
     84 	if (uvmexp.pagesize == 0) {
     85 		panic("uvm_init: page size not set");
     86 	}
     87 
     88 	memset(&uvm, 0, sizeof(uvm));
     89 	averunnable.fscale = FSCALE;
     90 
     91 	/*
     92 	 * Init the page sub-system.  This includes allocating the vm_page
     93 	 * structures, and setting up all the page queues (and locks).
     94 	 * Available memory will be put in the "free" queue, kvm_start and
     95 	 * kvm_end will be set to the area of kernel virtual memory which
     96 	 * is available for general use.
     97 	 */
     98 
     99 	uvm_page_init(&kvm_start, &kvm_end);
    100 
    101 	/*
    102 	 * Init the map sub-system.
    103 	 */
    104 
    105 	uvm_map_init();
    106 
    107 	/*
    108 	 * Setup the kernel's virtual memory data structures.  This includes
    109 	 * setting up the kernel_map/kernel_object.  Bootstrap all kernel
    110 	 * memory allocators.
    111 	 */
    112 
    113 	uao_init();
    114 	uvm_km_bootstrap(kvm_start, kvm_end);
    115 
    116 	/*
    117 	 * Setup uvm_map caches and init the amap.
    118 	 */
    119 
    120 	uvm_map_init_caches();
    121 	uvm_amap_init();
    122 
    123 	/*
    124 	 * Init the pmap module.  The pmap module is free to allocate
    125 	 * memory for its private use (e.g. pvlists).
    126 	 */
    127 
    128 	pmap_init();
    129 
    130 	/*
    131 	 * Init the kernel maps virtual address caches.  Make kernel memory
    132 	 * allocator ready for use.  After this call the pool/kmem memory
    133 	 * allocators can be used.
    134 	 */
    135 
    136 	uvm_km_init();
    137 
    138 #ifdef DEBUG
    139 	debug_init();
    140 #endif
    141 
    142 	/*
    143 	 * Init all pagers and the pager_map.
    144 	 */
    145 
    146 	uvm_pager_init();
    147 
    148 	/*
    149 	 * Initialize the uvm_loan() facility.
    150 	 */
    151 
    152 	uvm_loan_init();
    153 
    154 	/*
    155 	 * Init emap subsystem.
    156 	 */
    157 
    158 	uvm_emap_sysinit();
    159 
    160 	/*
    161 	 * The VM system is now up!  Now that kmem is up we can resize the
    162 	 * <obj,off> => <page> hash table for general use and enable paging
    163 	 * of kernel objects.
    164 	 */
    165 
    166 	uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
    167 	    UAO_FLAG_KERNSWAP);
    168 
    169 	uvmpdpol_reinit();
    170 
    171 	/*
    172 	 * Init anonymous memory systems.
    173 	 */
    174 
    175 	uvm_anon_init();
    176 
    177 	uvm_uarea_init();
    178 
    179 	/*
    180 	 * Init readahead mechanism.
    181 	 */
    182 
    183 	uvm_ra_init();
    184 }
    185