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

     /*      $NetBSD: uvm_init.c,v 1.55 2020/11/04 01:30:19 chs 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.
     *
     * 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 1.55 2020/11/04 01:30:19 chs Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/debug.h>
    #include <sys/file.h>
    #include <sys/filedesc.h>
    #include <sys/resourcevar.h>
    #include <sys/kmem.h>
    #include <sys/mman.h>
    #include <sys/vnode.h>
    
    #include <uvm/uvm.h>
    #include <uvm/uvm_pdpolicy.h>
    #include <uvm/uvm_physseg.h>
    #include <uvm/uvm_readahead.h>
    
    /*
     * struct uvm: we store most global vars in this structure to make them
     * easier to spot...
     */
    
    struct uvm uvm;         /* decl */
    struct uvmexp uvmexp;   /* decl */
    struct uvm_object *uvm_kernel_object;
    
    #if defined(__uvmexp_pagesize)
    const int * const uvmexp_pagesize = &uvmexp.pagesize;
    const int * const uvmexp_pagemask = &uvmexp.pagemask;
    const int * const uvmexp_pageshift = &uvmexp.pageshift;
    #endif
    
    kmutex_t uvm_kentry_lock __cacheline_aligned;
    
    /*
     * uvm_md_init: Init dependant on the MD boot context.
     *              called from MD code.
     */
    
    void
    uvm_md_init(void)
    {
            uvm_setpagesize(); /* initialize PAGE_SIZE-dependent variables */
            uvm_physseg_init();
    }
    
    /*
     * uvm_init: init the VM system.   called from kern/init_main.c.
     */
    
    void
    uvm_init(void)
    {
            vaddr_t kvm_start, kvm_end;
    
            /*
             * Ensure that the hardware set the page size, zero the UVM structure.
             */
    
            if (uvmexp.pagesize == 0) {
                    panic("uvm_init: page size not set");
            }
    
            memset(&uvm, 0, sizeof(uvm));
            averunnable.fscale = FSCALE;
   
           /*
            * 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);
           uvm_pglistalloc_init();
   
           /*
            * Init the map sub-system.
            */
   
           uvm_map_init();
   
           /*
            * Setup the kernel's virtual memory data structures.  This includes
            * setting up the kernel_map/kernel_object.
            * Bootstrap all kernel memory allocators.
            */
   
           uao_init();
           uvm_km_bootstrap(kvm_start, kvm_end);
   
           /*
            * Setup uvm_map caches and init the amap.
            */
   
           uvm_map_init_caches();
           uvm_amap_init();
   
           /*
            * Init the pmap module.  The pmap module is free to allocate
            * memory for its private use (e.g. pvlists).
            */
   
           pmap_init();
   
           /*
            * Make kernel memory allocators ready for use.
            * After this call the pool/kmem memory allocators can be used.
            */
   
           uvm_km_init();
   #ifdef __HAVE_PMAP_PV_TRACK
           pmap_pv_init();
   #endif
   
   #ifdef DEBUG
           debug_init();
   #endif
   
           /*
            * Init all pagers and the pager_map.
            */
   
           uvm_pager_init();
   
           /*
            * Initialize the uvm_loan() facility.
            */
   
           uvm_loan_init();
   
           /*
            * Enable paging of kernel objects.
            * This second pass of initializing kernel_object requires rw_obj,
            * so initialize that first.
            */
   
           rw_obj_init();
           uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
               UAO_FLAG_KERNSWAP);
   
           uvmpdpol_reinit();
   
           /*
            * Init anonymous memory systems.
            */
   
           uvm_anon_init();
   
           uvm_uarea_init();
   
           /*
            * Init readahead mechanism.
            */
   
           uvm_ra_init();
   }

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