1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/* $OpenBSD: uvm_map_i.h,v 1.20 2007/04/04 18:02:59 art Exp $ */
/* $NetBSD: uvm_map_i.h,v 1.18 2000/11/27 08:40:04 chs Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
* 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 Charles D. Cranor,
* Washington University, 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.
*
* @(#)vm_map.c 8.3 (Berkeley) 1/12/94
* from: Id: uvm_map_i.h,v 1.1.2.1 1997/08/14 19:10:50 chuck Exp
*
*
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
* All rights reserved.
*
* 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.
*/
#ifndef _UVM_UVM_MAP_I_H_
#define _UVM_UVM_MAP_I_H_
/*
* uvm_map_i.h
*/
/*
* inline functions [maybe]
*/
#if defined(UVM_MAP_INLINE) || defined(UVM_MAP)
/*
* uvm_map_create: create map
*/
MAP_INLINE vm_map_t
uvm_map_create(pmap, min, max, flags)
pmap_t pmap;
vaddr_t min, max;
int flags;
{
vm_map_t result;
MALLOC(result, vm_map_t,
(flags & VM_MAP_INTRSAFE) ? sizeof(struct vm_map_intrsafe) :
sizeof(struct vm_map),
M_VMMAP, M_WAITOK);
uvm_map_setup(result, min, max, flags);
result->pmap = pmap;
return(result);
}
/*
* uvm_map_setup: init map
*
* => map must not be in service yet.
*/
MAP_INLINE void
uvm_map_setup(map, min, max, flags)
vm_map_t map;
vaddr_t min, max;
int flags;
{
RB_INIT(&map->rbhead);
map->header.next = map->header.prev = &map->header;
map->nentries = 0;
map->size = 0;
map->ref_count = 1;
map->min_offset = min;
map->max_offset = max;
map->flags = flags;
map->first_free = &map->header;
map->hint = &map->header;
map->timestamp = 0;
rw_init(&map->lock, "vmmaplk");
simple_lock_init(&map->ref_lock);
simple_lock_init(&map->hint_lock);
/*
* If the map is interrupt safe, place it on the list
* of interrupt safe maps, for uvm_fault().
*
* We almost never set up an interrupt-safe map, but we set
* up quite a few regular ones (at every fork!), so put
* interrupt-safe map setup in the slow path.
*/
if (__predict_false(flags & VM_MAP_INTRSAFE)) {
struct vm_map_intrsafe *vmi = (struct vm_map_intrsafe *)map;
int s;
s = vmi_list_lock();
LIST_INSERT_HEAD(&vmi_list, vmi, vmi_list);
vmi_list_unlock(s);
}
}
/*
* U N M A P - m a i n e n t r y p o i n t
*/
/*
* uvm_unmap: remove mappings from a vm_map (from "start" up to "stop")
*
* => caller must check alignment and size
* => map must be unlocked (we will lock it)
*/
MAP_INLINE void
uvm_unmap_p(map, start, end, p)
vm_map_t map;
vaddr_t start,end;
struct proc *p;
{
vm_map_entry_t dead_entries;
UVMHIST_FUNC("uvm_unmap"); UVMHIST_CALLED(maphist);
UVMHIST_LOG(maphist, " (map=%p, start=0x%lx, end=0x%lx)",
map, start, end, 0);
/*
* work now done by helper functions. wipe the pmap's and then
* detach from the dead entries...
*/
vm_map_lock(map);
uvm_unmap_remove(map, start, end, &dead_entries, p);
vm_map_unlock(map);
if (dead_entries != NULL)
uvm_unmap_detach(dead_entries, 0);
UVMHIST_LOG(maphist, "<- done", 0,0,0,0);
}
/*
* uvm_map_reference: add reference to a map
*
* => map need not be locked (we use ref_lock).
*/
MAP_INLINE void
uvm_map_reference(map)
vm_map_t map;
{
simple_lock(&map->ref_lock);
map->ref_count++;
simple_unlock(&map->ref_lock);
}
/*
* uvm_map_deallocate: drop reference to a map
*
* => caller must not lock map
* => we will zap map if ref count goes to zero
*/
MAP_INLINE void
uvm_map_deallocate(map)
vm_map_t map;
{
int c;
simple_lock(&map->ref_lock);
c = --map->ref_count;
simple_unlock(&map->ref_lock);
if (c > 0) {
return;
}
/*
* all references gone. unmap and free.
*/
uvm_unmap(map, map->min_offset, map->max_offset);
pmap_destroy(map->pmap);
FREE(map, M_VMMAP);
}
#endif /* defined(UVM_MAP_INLINE) || defined(UVM_MAP) */
#endif /* _UVM_UVM_MAP_I_H_ */
|