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Annotation of src/sys/uvm/uvm_init.c, Revision 1.12

1.12    ! simonb      1: /*     $NetBSD: uvm_init.c,v 1.11 1999/03/25 18:48:51 mrg Exp $        */
1.1       mrg         2:
                      3: /*
                      4:  *
                      5:  * Copyright (c) 1997 Charles D. Cranor and Washington University.
                      6:  * All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *      This product includes software developed by Charles D. Cranor and
                     19:  *      Washington University.
                     20:  * 4. The name of the author may not be used to endorse or promote products
                     21:  *    derived from this software without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     25:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     26:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     27:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     28:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     29:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     30:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     31:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     32:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.4       mrg        33:  *
                     34:  * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
1.1       mrg        35:  */
                     36:
                     37: /*
                     38:  * uvm_init.c: init the vm system.
                     39:  */
                     40:
                     41: #include <sys/param.h>
                     42: #include <sys/systm.h>
                     43: #include <sys/file.h>
                     44: #include <sys/filedesc.h>
                     45: #include <sys/resourcevar.h>
                     46: #include <sys/mman.h>
                     47: #include <sys/proc.h>
                     48: #include <sys/malloc.h>
                     49: #include <sys/vnode.h>
                     50:
                     51:
                     52: #include <vm/vm.h>
                     53: #include <vm/vm_page.h>
                     54: #include <vm/vm_kern.h>
                     55:
                     56: #include <uvm/uvm.h>
                     57:
                     58: /*
                     59:  * struct uvm: we store all global vars in this structure to make them
                     60:  * easier to spot...
                     61:  */
                     62:
                     63: struct uvm uvm;                /* decl */
                     64: struct uvmexp uvmexp;  /* decl */
                     65:
                     66: /*
                     67:  * local prototypes
                     68:  */
                     69:
                     70: /*
                     71:  * uvm_init: init the VM system.   called from kern/init_main.c.
                     72:  */
                     73:
1.6       mrg        74: void
                     75: uvm_init()
1.1       mrg        76: {
1.9       eeh        77:        vaddr_t kvm_start, kvm_end;
1.1       mrg        78:
1.6       mrg        79:        /*
                     80:         * step 0: ensure that the hardware set the page size
                     81:         */
1.1       mrg        82:
1.6       mrg        83:        if (uvmexp.pagesize == 0) {
                     84:                panic("uvm_init: page size not set");
                     85:        }
1.1       mrg        86:
1.6       mrg        87:        /*
                     88:         * step 1: zero the uvm structure
                     89:         */
1.1       mrg        90:
1.8       perry      91:        memset(&uvm, 0, sizeof(uvm));
1.6       mrg        92:        averunnable.fscale = FSCALE;
1.1       mrg        93:
1.6       mrg        94:        /*
                     95:         * step 2: init the page sub-system.  this includes allocating the
                     96:         * vm_page structures, and setting up all the page queues (and
                     97:         * locks).  available memory will be put in the "free" queue.
                     98:         * kvm_start and kvm_end will be set to the area of kernel virtual
                     99:         * memory which is available for general use.
                    100:         */
1.1       mrg       101:
1.6       mrg       102:        uvm_page_init(&kvm_start, &kvm_end);
1.1       mrg       103:
1.6       mrg       104:        /*
                    105:         * step 3: init the map sub-system.  allocates the static pool of
                    106:         * vm_map_entry structures that are used for "special" kernel maps
                    107:         * (e.g. kernel_map, kmem_map, etc...).
                    108:         */
1.1       mrg       109:
1.6       mrg       110:        uvm_map_init();
1.1       mrg       111:
1.6       mrg       112:        /*
                    113:         * step 4: setup the kernel's virtual memory data structures.  this
                    114:         * includes setting up the kernel_map/kernel_object and the kmem_map/
                    115:         * kmem_object.
                    116:         */
1.1       mrg       117:
1.6       mrg       118:        uvm_km_init(kvm_start, kvm_end);
1.1       mrg       119:
1.6       mrg       120:        /*
                    121:         * step 5: init the pmap module.   the pmap module is free to allocate
                    122:         * memory for its private use (e.g. pvlists).
                    123:         */
1.1       mrg       124:
1.6       mrg       125:        pmap_init();
1.1       mrg       126:
1.6       mrg       127:        /*
                    128:         * step 6: init the kernel memory allocator.   after this call the
                    129:         * kernel memory allocator (malloc) can be used.
                    130:         */
1.1       mrg       131:
1.6       mrg       132:        kmeminit();
1.1       mrg       133:
1.6       mrg       134:        /*
                    135:         * step 7: init all pagers and the pager_map.
                    136:         */
1.1       mrg       137:
1.6       mrg       138:        uvm_pager_init();
1.1       mrg       139:
1.6       mrg       140:        /*
1.10      chuck     141:         * step 8: init anonymous memory systems (both amap and anons)
1.6       mrg       142:         */
1.1       mrg       143:
1.10      chuck     144:        amap_init();            /* init amap module */
                    145:        uvm_anon_init();        /* allocate initial anons */
1.1       mrg       146:
1.6       mrg       147:        /*
                    148:         * the VM system is now up!  now that malloc is up we can resize the
                    149:         * <obj,off> => <page> hash table for general use and enable paging
                    150:         * of kernel objects.
                    151:         */
1.3       chs       152:
1.6       mrg       153:        uvm_page_rehash();
                    154:        uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
                    155:            UAO_FLAG_KERNSWAP);
1.1       mrg       156:
1.6       mrg       157:        /*
                    158:         * done!
                    159:         */
1.1       mrg       160:
1.6       mrg       161:        return;
1.1       mrg       162: }

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