FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_init.c

     /*      $NetBSD: uvm_init.c,v 1.26 2006/09/15 15:51:13 yamt Exp $       */
     
     /*
      *
      * Copyright (c) 1997 Charles D. Cranor and Washington University.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Charles D. Cranor and
     *      Washington University.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
     */
    
    /*
     * uvm_init.c: init the vm system.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: uvm_init.c,v 1.26 2006/09/15 15:51:13 yamt Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/file.h>
    #include <sys/filedesc.h>
    #include <sys/resourcevar.h>
    #include <sys/mman.h>
    #include <sys/proc.h>
    #include <sys/malloc.h>
    #include <sys/vnode.h>
    
    #include <uvm/uvm.h>
    #include <uvm/uvm_pdpolicy.h>
    
    /*
     * struct uvm: we store all global vars in this structure to make them
     * easier to spot...
     */
    
    struct uvm uvm;         /* decl */
    struct uvmexp uvmexp;   /* decl */
    
    /*
     * local prototypes
     */
    
    /*
     * uvm_init: init the VM system.   called from kern/init_main.c.
     */
    
    void
    uvm_init(void)
    {
            vaddr_t kvm_start, kvm_end;
    
            /*
             * step 0: ensure that the hardware set the page size
             */
    
            if (uvmexp.pagesize == 0) {
                    panic("uvm_init: page size not set");
            }
    
            /*
             * step 1: zero the uvm structure
             */
    
            memset(&uvm, 0, sizeof(uvm));
            averunnable.fscale = FSCALE;
    
            /*
             * step 2: init the page sub-system.  this includes allocating the
             * vm_page structures, and setting up all the page queues (and
             * locks).  available memory will be put in the "free" queue.
             * kvm_start and kvm_end will be set to the area of kernel virtual
             * memory which is available for general use.
             */
   
           uvm_page_init(&kvm_start, &kvm_end);
   
           /*
            * step 3: init the map sub-system.  allocates the static pool of
            * vm_map_entry structures that are used for "special" kernel maps
            * (e.g. kernel_map, kmem_map, etc...).
            */
   
           uvm_map_init();
   
           /*
            * step 4: setup the kernel's virtual memory data structures.  this
            * includes setting up the kernel_map/kernel_object.
            */
   
           uvm_km_init(kvm_start, kvm_end);
   
           /*
            * step 5: init the pmap module.   the pmap module is free to allocate
            * memory for its private use (e.g. pvlists).
            */
   
           pmap_init();
   
           /*
            * step 6: init the kernel memory allocator.   after this call the
            * kernel memory allocator (malloc) can be used. this includes
            * setting up the kmem_map.
            */
   
           kmeminit();
   
           /*
            * step 7: init all pagers and the pager_map.
            */
   
           uvm_pager_init();
   
           /*
            * step 8: init the uvm_loan() facility.
            */
   
           uvm_loan_init();
   
           /*
            * the VM system is now up!  now that malloc is up we can resize the
            * <obj,off> => <page> hash table for general use and enable paging
            * of kernel objects.
            */
   
           uvm_page_rehash();
           uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
               UAO_FLAG_KERNSWAP);
   
           uvmpdpol_reinit();
   
           /*
            * Initialize pools.  This must be done before anyone manipulates
            * any vm_maps because we use a pool for some map entry structures.
            */
   
           pool_subsystem_init();
   
           /*
            * init anonymous memory systems
            */
   
           uvm_anon_init();
   }

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