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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
/* $OpenBSD: uvm_fault_i.h,v 1.10 2002/03/14 01:27:18 millert Exp $ */
/* $NetBSD: uvm_fault_i.h,v 1.11 2000/06/26 14:21:17 mrg Exp $ */
/*
*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
* All rights reserved.
*
* 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 and
* Washington University.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* from: Id: uvm_fault_i.h,v 1.1.6.1 1997/12/08 16:07:12 chuck Exp
*/
#ifndef _UVM_UVM_FAULT_I_H_
#define _UVM_UVM_FAULT_I_H_
/*
* uvm_fault_i.h: fault inline functions
*/
static boolean_t uvmfault_check_intrsafe(struct uvm_faultinfo *);
static boolean_t uvmfault_lookup(struct uvm_faultinfo *, boolean_t);
static boolean_t uvmfault_relock(struct uvm_faultinfo *);
static void uvmfault_unlockall(struct uvm_faultinfo *, struct vm_amap *,
struct uvm_object *, struct vm_anon *);
static void uvmfault_unlockmaps(struct uvm_faultinfo *, boolean_t);
/*
* uvmfault_unlockmaps: unlock the maps
*/
static __inline void
uvmfault_unlockmaps(ufi, write_locked)
struct uvm_faultinfo *ufi;
boolean_t write_locked;
{
/*
* ufi can be NULL when this isn't really a fault,
* but merely paging in anon data.
*/
if (ufi == NULL) {
return;
}
if (write_locked) {
vm_map_unlock(ufi->map);
} else {
vm_map_unlock_read(ufi->map);
}
}
/*
* uvmfault_unlockall: unlock everything passed in.
*
* => maps must be read-locked (not write-locked).
*/
static __inline void
uvmfault_unlockall(ufi, amap, uobj, anon)
struct uvm_faultinfo *ufi;
struct vm_amap *amap;
struct uvm_object *uobj;
struct vm_anon *anon;
{
if (anon)
simple_unlock(&anon->an_lock);
if (uobj)
simple_unlock(&uobj->vmobjlock);
if (amap)
amap_unlock(amap);
uvmfault_unlockmaps(ufi, FALSE);
}
/*
* uvmfault_check_intrsafe: check for a virtual address managed by
* an interrupt-safe map.
*
* => caller must provide a uvm_faultinfo structure with the IN
* params properly filled in
* => if we find an intersafe VA, we fill in ufi->map, and return TRUE
*/
static __inline boolean_t
uvmfault_check_intrsafe(ufi)
struct uvm_faultinfo *ufi;
{
struct vm_map_intrsafe *vmi;
int s;
s = vmi_list_lock();
for (vmi = LIST_FIRST(&vmi_list); vmi != NULL;
vmi = LIST_NEXT(vmi, vmi_list)) {
if (ufi->orig_rvaddr >= vm_map_min(&vmi->vmi_map) &&
ufi->orig_rvaddr < vm_map_max(&vmi->vmi_map))
break;
}
vmi_list_unlock(s);
if (vmi != NULL) {
ufi->map = &vmi->vmi_map;
return (TRUE);
}
return (FALSE);
}
/*
* uvmfault_lookup: lookup a virtual address in a map
*
* => caller must provide a uvm_faultinfo structure with the IN
* params properly filled in
* => we will lookup the map entry (handling submaps) as we go
* => if the lookup is a success we will return with the maps locked
* => if "write_lock" is TRUE, we write_lock the map, otherwise we only
* get a read lock.
* => note that submaps can only appear in the kernel and they are
* required to use the same virtual addresses as the map they
* are referenced by (thus address translation between the main
* map and the submap is unnecessary).
*/
static __inline boolean_t
uvmfault_lookup(ufi, write_lock)
struct uvm_faultinfo *ufi;
boolean_t write_lock;
{
vm_map_t tmpmap;
/*
* init ufi values for lookup.
*/
ufi->map = ufi->orig_map;
ufi->size = ufi->orig_size;
/*
* keep going down levels until we are done. note that there can
* only be two levels so we won't loop very long.
*/
while (1) {
/*
* lock map
*/
if (write_lock) {
vm_map_lock(ufi->map);
} else {
vm_map_lock_read(ufi->map);
}
/*
* lookup
*/
if (!uvm_map_lookup_entry(ufi->map, ufi->orig_rvaddr,
&ufi->entry)) {
uvmfault_unlockmaps(ufi, write_lock);
return(FALSE);
}
/*
* reduce size if necessary
*/
if (ufi->entry->end - ufi->orig_rvaddr < ufi->size)
ufi->size = ufi->entry->end - ufi->orig_rvaddr;
/*
* submap? replace map with the submap and lookup again.
* note: VAs in submaps must match VAs in main map.
*/
if (UVM_ET_ISSUBMAP(ufi->entry)) {
tmpmap = ufi->entry->object.sub_map;
if (write_lock) {
vm_map_unlock(ufi->map);
} else {
vm_map_unlock_read(ufi->map);
}
ufi->map = tmpmap;
continue;
}
/*
* got it!
*/
ufi->mapv = ufi->map->timestamp;
return(TRUE);
} /* while loop */
/*NOTREACHED*/
}
/*
* uvmfault_relock: attempt to relock the same version of the map
*
* => fault data structures should be unlocked before calling.
* => if a success (TRUE) maps will be locked after call.
*/
static __inline boolean_t
uvmfault_relock(ufi)
struct uvm_faultinfo *ufi;
{
/*
* ufi can be NULL when this isn't really a fault,
* but merely paging in anon data.
*/
if (ufi == NULL) {
return TRUE;
}
uvmexp.fltrelck++;
/*
* relock map. fail if version mismatch (in which case nothing
* gets locked).
*/
vm_map_lock_read(ufi->map);
if (ufi->mapv != ufi->map->timestamp) {
vm_map_unlock_read(ufi->map);
return(FALSE);
}
uvmexp.fltrelckok++;
return(TRUE); /* got it! */
}
#endif /* _UVM_UVM_FAULT_I_H_ */
|
