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Annotation of sys/uvm/uvm_init.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: uvm_init.c,v 1.16 2007/06/18 21:51:15 pedro Exp $     */
                      2: /*     $NetBSD: uvm_init.c,v 1.14 2000/06/27 17:29:23 mrg Exp $        */
                      3:
                      4: /*
                      5:  *
                      6:  * Copyright (c) 1997 Charles D. Cranor and Washington University.
                      7:  * All rights reserved.
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. All advertising materials mentioning features or use of this software
                     18:  *    must display the following acknowledgement:
                     19:  *      This product includes software developed by Charles D. Cranor and
                     20:  *      Washington University.
                     21:  * 4. The name of the author may not be used to endorse or promote products
                     22:  *    derived from this software without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     25:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     26:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     27:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     28:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     29:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     30:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     31:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     32:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     33:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     34:  *
                     35:  * from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
                     36:  */
                     37:
                     38: /*
                     39:  * uvm_init.c: init the vm system.
                     40:  */
                     41:
                     42: #include <sys/param.h>
                     43: #include <sys/systm.h>
                     44: #include <sys/file.h>
                     45: #include <sys/filedesc.h>
                     46: #include <sys/resourcevar.h>
                     47: #include <sys/mman.h>
                     48: #include <sys/proc.h>
                     49: #include <sys/malloc.h>
                     50: #include <sys/vnode.h>
                     51:
                     52: #include <uvm/uvm.h>
                     53:
                     54: /*
                     55:  * struct uvm: we store all global vars in this structure to make them
                     56:  * easier to spot...
                     57:  */
                     58:
                     59: struct uvm uvm;                /* decl */
                     60: struct uvmexp uvmexp;  /* decl */
                     61:
                     62: /*
                     63:  * local prototypes
                     64:  */
                     65:
                     66: /*
                     67:  * uvm_init: init the VM system.   called from kern/init_main.c.
                     68:  */
                     69:
                     70: void
                     71: uvm_init()
                     72: {
                     73:        vaddr_t kvm_start, kvm_end;
                     74:
                     75:        /*
                     76:         * step 0: ensure that the hardware set the page size
                     77:         */
                     78:
                     79:        if (uvmexp.pagesize == 0) {
                     80:                panic("uvm_init: page size not set");
                     81:        }
                     82:
                     83:        /*
                     84:         * step 1: zero the uvm structure
                     85:         */
                     86:
                     87:        memset(&uvm, 0, sizeof(uvm));
                     88:        averunnable.fscale = FSCALE;
                     89:
                     90:        /*
                     91:         * step 2: init the page sub-system.  this includes allocating the
                     92:         * vm_page structures, and setting up all the page queues (and
                     93:         * locks).  available memory will be put in the "free" queue.
                     94:         * kvm_start and kvm_end will be set to the area of kernel virtual
                     95:         * memory which is available for general use.
                     96:         */
                     97:
                     98:        uvm_page_init(&kvm_start, &kvm_end);
                     99:
                    100:        /*
                    101:         * step 3: init the map sub-system.  allocates the static pool of
                    102:         * vm_map_entry structures that are used for "special" kernel maps
                    103:         * (e.g. kernel_map, kmem_map, etc...).
                    104:         */
                    105:
                    106:        uvm_map_init();
                    107:
                    108:        /*
                    109:         * step 4: setup the kernel's virtual memory data structures.  this
                    110:         * includes setting up the kernel_map/kernel_object and the kmem_map/
                    111:         * kmem_object.
                    112:         */
                    113:
                    114:        uvm_km_init(kvm_start, kvm_end);
                    115:
                    116:        /*
                    117:         * step 5: init the pmap module.   the pmap module is free to allocate
                    118:         * memory for its private use (e.g. pvlists).
                    119:         */
                    120:
                    121:        pmap_init();
                    122:
                    123:        /*
                    124:         * step 6: init the kernel memory allocator.   after this call the
                    125:         * kernel memory allocator (malloc) can be used.
                    126:         */
                    127:
                    128:        kmeminit();
                    129:
                    130:        /*
                    131:         * step 7: init all pagers and the pager_map.
                    132:         */
                    133:
                    134:        uvm_pager_init();
                    135:
                    136:        /*
                    137:         * step 8: init anonymous memory system
                    138:         */
                    139:
                    140:        amap_init();            /* init amap module */
                    141:
                    142:        /*
                    143:         * the VM system is now up!  now that malloc is up we can resize the
                    144:         * <obj,off> => <page> hash table for general use and enable paging
                    145:         * of kernel objects.
                    146:         */
                    147:
                    148:        uvm_page_rehash();
                    149:        uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
                    150:            UAO_FLAG_KERNSWAP);
                    151:
                    152:        uvm_km_page_init();
                    153:
                    154:        /*
                    155:         * reserve some unmapped space for malloc/pool use after free usage
                    156:         */
                    157: #ifdef DEADBEEF0
                    158:        kvm_start = trunc_page(DEADBEEF0) - PAGE_SIZE;
                    159:        if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE,
                    160:            NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_NONE,
                    161:            UVM_PROT_NONE, UVM_INH_NONE, UVM_ADV_RANDOM, UVM_FLAG_FIXED)))
                    162:                panic("uvm_init: cannot reserve dead beef @0x%x\n", DEADBEEF0);
                    163: #endif
                    164: #ifdef DEADBEEF1
                    165:        kvm_start = trunc_page(DEADBEEF1) - PAGE_SIZE;
                    166:        if (uvm_map(kernel_map, &kvm_start, 3 * PAGE_SIZE,
                    167:            NULL, UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_NONE,
                    168:            UVM_PROT_NONE, UVM_INH_NONE, UVM_ADV_RANDOM, UVM_FLAG_FIXED)))
                    169:                panic("uvm_init: cannot reserve dead beef @0x%x\n", DEADBEEF1);
                    170: #endif
                    171:        /*
                    172:         * init anonymous memory systems
                    173:         */
                    174:        uvm_anon_init();
                    175: }

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