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
|
/*
* Mach Operating System
* Copyright (c) 1991 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 Mellon
* the rights to redistribute these changes.
*/
/*
* Package to wire current task's memory.
*/
#include <mach.h>
#include <mach_init.h>
#include <mach/machine/vm_param.h>
#include "default_pager.h"
mach_port_t this_task; /* our task */
mach_port_t priv_host_port = MACH_PORT_NULL;
/* the privileged host port */
void
wire_setup(host_priv)
mach_port_t host_priv;
{
priv_host_port = host_priv;
this_task = mach_task_self();
}
void
wire_memory(start, size, prot)
vm_address_t start;
vm_size_t size;
vm_prot_t prot;
{
kern_return_t kr;
if (priv_host_port == MACH_PORT_NULL)
return;
kr = vm_wire(priv_host_port,
this_task,
start, size, prot);
if (kr != KERN_SUCCESS)
panic("mem_wire: %d", kr);
}
void
wire_thread()
{
kern_return_t kr;
if (priv_host_port == MACH_PORT_NULL)
return;
kr = thread_wire(priv_host_port,
mach_thread_self(),
TRUE);
if (kr != KERN_SUCCESS)
panic("wire_thread: %d", kr);
}
void
wire_all_memory()
{
kern_return_t kr;
vm_offset_t address;
vm_size_t size;
vm_prot_t protection;
vm_prot_t max_protection;
vm_inherit_t inheritance;
boolean_t is_shared;
memory_object_name_t object;
vm_offset_t offset;
if (priv_host_port == MACH_PORT_NULL)
return;
/* iterate thru all regions, wiring */
address = 0;
while (
(kr = vm_region(this_task, &address,
&size,
&protection,
&max_protection,
&inheritance,
&is_shared,
&object,
&offset))
== KERN_SUCCESS)
{
if (MACH_PORT_VALID(object))
(void) mach_port_deallocate(this_task, object);
if (protection != VM_PROT_NONE)
{
/* The VM system cannot cope with a COW fault on another
unrelated virtual copy happening later when we have
wired down the original page. So we must touch all our
pages before wiring to make sure that only we will ever
use them. */
void *page;
if (!(protection & VM_PROT_WRITE))
{
kr = vm_protect(this_task, address, size,
0, max_protection);
}
for (page = (void *) address;
page < (void *) (address + size);
page += vm_page_size)
*(volatile int *) page = *(int *) page;
wire_memory(address, size, protection);
if (!(protection & VM_PROT_WRITE))
{
kr = vm_protect(this_task, address, size,
0, protection);
}
}
address += size;
}
}
/*
* Alias for vm_allocate to return wired memory.
*/
kern_return_t
vm_allocate(task, address, size, anywhere)
task_t task;
vm_address_t *address;
vm_size_t size;
boolean_t anywhere;
{
kern_return_t kr;
if (anywhere)
*address = VM_MIN_ADDRESS;
kr = vm_map(task,
address, size, (vm_offset_t) 0, anywhere,
MEMORY_OBJECT_NULL, (vm_offset_t)0, FALSE,
VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
if (kr != KERN_SUCCESS)
return kr;
if (task == this_task)
(void) vm_wire(priv_host_port, task, *address, size,
VM_PROT_DEFAULT);
return KERN_SUCCESS;
}
/* Other versions of this function in libc... */
kern_return_t
__vm_allocate (task, address, size, anywhere)
task_t task;
vm_address_t *address;
vm_size_t size;
boolean_t anywhere;
{
return vm_allocate (task, address, size, anywhere);
}
|
