Annotation of sys/uvm/uvm_init.c, Revision 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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