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
|
/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University.
* Copyright (c) 1993,1994 The University of Utah and
* the Computer Systems Laboratory (CSL).
* 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, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
* THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM 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 Mellon
* the rights to redistribute these changes.
*/
/*
* File: ipc/ipc_entry.c
* Author: Rich Draves
* Date: 1989
*
* Primitive functions to manipulate translation entries.
*/
#include <kern/printf.h>
#include <string.h>
#include <mach/kern_return.h>
#include <mach/port.h>
#include <kern/assert.h>
#include <kern/sched_prim.h>
#include <kern/slab.h>
#include <ipc/port.h>
#include <ipc/ipc_types.h>
#include <ipc/ipc_entry.h>
#include <ipc/ipc_space.h>
#include <ipc/ipc_table.h>
#include <ipc/ipc_object.h>
struct kmem_cache ipc_entry_cache;
/*
* Routine: ipc_entry_alloc
* Purpose:
* Allocate an entry out of the space.
* Conditions:
* The space is not locked before, but it is write-locked after
* if the call is successful. May allocate memory.
* Returns:
* KERN_SUCCESS An entry was allocated.
* KERN_INVALID_TASK The space is dead.
* KERN_NO_SPACE No room for an entry in the space.
* KERN_RESOURCE_SHORTAGE Couldn't allocate memory for an entry.
*/
kern_return_t
ipc_entry_alloc(
ipc_space_t space,
mach_port_t *namep,
ipc_entry_t *entryp)
{
kern_return_t kr;
ipc_entry_t entry;
rdxtree_key_t key;
is_write_lock(space);
if (!space->is_active) {
is_write_unlock(space);
return KERN_INVALID_TASK;
}
kr = ipc_entry_get(space, namep, entryp);
if (kr == KERN_SUCCESS)
/* Success. Space is write-locked. */
return kr;
entry = ie_alloc();
if (entry == IE_NULL) {
is_write_unlock(space);
return KERN_RESOURCE_SHORTAGE;
}
kr = rdxtree_insert_alloc(&space->is_map, entry, &key);
if (kr) {
is_write_unlock(space);
ie_free(entry);
return kr;
}
space->is_size += 1;
entry->ie_bits = 0;
entry->ie_object = IO_NULL;
entry->ie_request = 0;
entry->ie_name = (mach_port_t) key;
*entryp = entry;
*namep = (mach_port_t) key;
/* Success. Space is write-locked. */
return KERN_SUCCESS;
}
/*
* Routine: ipc_entry_alloc_name
* Purpose:
* Allocates/finds an entry with a specific name.
* If an existing entry is returned, its type will be nonzero.
* Conditions:
* The space is not locked before, but it is write-locked after
* if the call is successful. May allocate memory.
* Returns:
* KERN_SUCCESS Found existing entry with same name.
* KERN_SUCCESS Allocated a new entry.
* KERN_INVALID_TASK The space is dead.
* KERN_RESOURCE_SHORTAGE Couldn't allocate memory.
*/
kern_return_t
ipc_entry_alloc_name(
ipc_space_t space,
mach_port_t name,
ipc_entry_t *entryp)
{
kern_return_t kr;
ipc_entry_t entry, e, *prevp;
void **slot;
assert(MACH_PORT_VALID(name));
is_write_lock(space);
if (!space->is_active) {
is_write_unlock(space);
return KERN_INVALID_TASK;
}
slot = rdxtree_lookup_slot(&space->is_map, (rdxtree_key_t) name);
if (slot != NULL)
entry = *(ipc_entry_t *) slot;
if (slot == NULL || entry == IE_NULL) {
entry = ie_alloc();
if (entry == IE_NULL) {
is_write_unlock(space);
return KERN_RESOURCE_SHORTAGE;
}
entry->ie_bits = 0;
entry->ie_object = IO_NULL;
entry->ie_request = 0;
entry->ie_name = name;
if (slot != NULL)
rdxtree_replace_slot(slot, entry);
else {
kr = rdxtree_insert(&space->is_map,
(rdxtree_key_t) name, entry);
if (kr != KERN_SUCCESS) {
is_write_unlock(space);
ie_free(entry);
return kr;
}
}
space->is_size += 1;
*entryp = entry;
/* Success. Space is write-locked. */
return KERN_SUCCESS;
}
if (IE_BITS_TYPE(entry->ie_bits)) {
/* Used entry. */
*entryp = entry;
/* Success. Space is write-locked. */
return KERN_SUCCESS;
}
/* Free entry. Rip the entry out of the free list. */
for (prevp = &space->is_free_list, e = space->is_free_list;
e != entry;
({ prevp = &e->ie_next_free; e = e->ie_next_free; }))
continue;
*prevp = entry->ie_next_free;
space->is_free_list_size -= 1;
entry->ie_bits = 0;
assert(entry->ie_object == IO_NULL);
assert(entry->ie_name == name);
entry->ie_request = 0;
space->is_size += 1;
*entryp = entry;
/* Success. Space is write-locked. */
return KERN_SUCCESS;
}
#if MACH_KDB
#include <ddb/db_output.h>
#include <kern/task.h>
#define printf kdbprintf
ipc_entry_t
db_ipc_object_by_name(
const task_t task,
mach_port_t name)
{
ipc_space_t space = task->itk_space;
ipc_entry_t entry;
entry = ipc_entry_lookup(space, name);
if(entry != IE_NULL) {
iprintf("(task 0x%x, name 0x%x) ==> object 0x%x",
entry->ie_object);
return (ipc_entry_t) entry->ie_object;
}
return entry;
}
#endif /* MACH_KDB */
|
