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: }
CVSweb