FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_init.c

     /*
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * The Mach Operating System project at Carnegie-Mellon University.
      *
      * 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 the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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: @(#)vm_init.c     8.1 (Berkeley) 6/11/93
     *
     *
     * Copyright (c) 1987, 1990 Carnegie-Mellon University.
     * All rights reserved.
     *
     * Authors: Avadis Tevanian, Jr., Michael Wayne Young
     *
     * Permission to use, copy, modify and distribute this software and
     * its documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     *
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * Carnegie Mellon requests users of this software to return to
     *
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     *
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     */
    
    /*
     *      Initialize the Virtual Memory subsystem.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.2/sys/vm/vm_init.c 119658 2003-09-01 16:46:47Z eivind $");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/systm.h>
    #include <sys/selinfo.h>
    #include <sys/pipe.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    
    #include <vm/vm.h>
    #include <vm/vm_param.h>
    #include <vm/vm_kern.h>
    #include <vm/vm_object.h>
    #include <vm/vm_page.h>
    #include <vm/vm_map.h>
    #include <vm/vm_pager.h>
    #include <vm/vm_extern.h>
    
    long physmem;
    
    /*
     * System initialization
     */
    static void vm_mem_init(void *);
    SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_FIRST, vm_mem_init, NULL)
    
   /*
    *      vm_init initializes the virtual memory system.
    *      This is done only by the first cpu up.
    *
    *      The start and end address of physical memory is passed in.
    */
   /* ARGSUSED*/
   static void
   vm_mem_init(dummy)
           void *dummy;
   {
           /*
            * Initializes resident memory structures. From here on, all physical
            * memory is accounted for, and we use only virtual addresses.
            */
           vm_set_page_size();
           virtual_avail = vm_page_startup(avail_start, avail_end, virtual_avail);
           
           /*
            * Initialize other VM packages
            */
           vm_object_init();
           vm_map_startup();
           kmem_init(virtual_avail, virtual_end);
           pmap_init(avail_start, avail_end);
           vm_pager_init();
   }
   
   void
   vm_ksubmap_init(struct kva_md_info *kmi)
   {
           vm_offset_t firstaddr;
           caddr_t v;
           vm_size_t size = 0;
           long physmem_est;
           vm_offset_t minaddr;
           vm_offset_t maxaddr;
           vm_map_t clean_map;
   
           /*
            * Allocate space for system data structures.
            * The first available kernel virtual address is in "v".
            * As pages of kernel virtual memory are allocated, "v" is incremented.
            * As pages of memory are allocated and cleared,
            * "firstaddr" is incremented.
            * An index into the kernel page table corresponding to the
            * virtual memory address maintained in "v" is kept in "mapaddr".
            */
   
           /*
            * Make two passes.  The first pass calculates how much memory is
            * needed and allocates it.  The second pass assigns virtual
            * addresses to the various data structures.
            */
           firstaddr = 0;
   again:
           v = (caddr_t)firstaddr;
   
           v = kern_timeout_callwheel_alloc(v);
   
           /*
            * Discount the physical memory larger than the size of kernel_map
            * to avoid eating up all of KVA space.
            */
           if (kernel_map->first_free == NULL) {
                   printf("Warning: no free entries in kernel_map.\n");
                   physmem_est = physmem;
           } else {
                   physmem_est = lmin(physmem, btoc(kernel_map->max_offset -
                       kernel_map->min_offset));
           }
   
           v = kern_vfs_bio_buffer_alloc(v, physmem_est);
   
           /*
            * End of first pass, size has been calculated so allocate memory
            */
           if (firstaddr == 0) {
                   size = (vm_size_t)v;
                   firstaddr = kmem_alloc(kernel_map, round_page(size));
                   if (firstaddr == 0)
                           panic("startup: no room for tables");
                   goto again;
           }
   
           /*
            * End of second pass, addresses have been assigned
            */
           if ((vm_size_t)((char *)v - firstaddr) != size)
                   panic("startup: table size inconsistency");
   
           clean_map = kmem_suballoc(kernel_map, &kmi->clean_sva, &kmi->clean_eva,
                           (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
           buffer_map = kmem_suballoc(clean_map, &kmi->buffer_sva,
                           &kmi->buffer_eva, (nbuf*BKVASIZE));
           buffer_map->system_map = 1;
           pager_map = kmem_suballoc(clean_map, &kmi->pager_sva, &kmi->pager_eva,
                                   (nswbuf*MAXPHYS) + pager_map_size);
           pager_map->system_map = 1;
           exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
                                   (16*(ARG_MAX+(PAGE_SIZE*3))));
           pipe_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, maxpipekva);
   
           /*
            * XXX: Mbuf system machine-specific initializations should
            *      go here, if anywhere.
            */
   
           /*
            * Initialize the callouts we just allocated.
            */
           kern_timeout_callwheel_init();
   }
   

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