1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2004 Mark R V Murray
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29
30 #include <sys/param.h>
31 #include <sys/conf.h>
32 #include <sys/fcntl.h>
33 #include <sys/ioccom.h>
34 #include <sys/kernel.h>
35 #include <sys/kerneldump.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/memrange.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
41 #include <sys/priv.h>
42 #include <sys/proc.h>
43 #include <sys/signalvar.h>
44 #include <sys/systm.h>
45 #include <sys/uio.h>
46
47 #include <vm/vm.h>
48 #include <vm/vm_param.h>
49 #include <vm/pmap.h>
50 #include <vm/vm_map.h>
51 #include <vm/vm_object.h>
52 #include <vm/vm_page.h>
53 #include <vm/vm_phys.h>
54
55 #include <machine/memdev.h>
56
57 static struct cdev *memdev, *kmemdev;
58
59 static d_ioctl_t memioctl;
60
61 static struct cdevsw mem_cdevsw = {
62 .d_version = D_VERSION,
63 .d_flags = D_MEM,
64 .d_open = memopen,
65 .d_read = memrw,
66 .d_write = memrw,
67 .d_ioctl = memioctl,
68 .d_mmap = memmmap,
69 .d_name = "mem",
70 };
71
72 /* ARGSUSED */
73 int
memopen(struct cdev * dev __unused,int flags,int fmt __unused,struct thread * td)74 memopen(struct cdev *dev __unused, int flags, int fmt __unused,
75 struct thread *td)
76 {
77 int error = 0;
78
79 if (flags & FREAD)
80 error = priv_check(td, PRIV_KMEM_READ);
81 if (flags & FWRITE) {
82 if (error == 0)
83 error = priv_check(td, PRIV_KMEM_WRITE);
84 if (error == 0)
85 error = securelevel_gt(td->td_ucred, 0);
86 }
87
88 return (error);
89 }
90
91 static int
memioctl(struct cdev * dev,u_long cmd,caddr_t data,int flags,struct thread * td)92 memioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
93 struct thread *td)
94 {
95 vm_map_t map;
96 vm_map_entry_t entry;
97 const struct mem_livedump_arg *marg;
98 struct mem_extract *me;
99 int error;
100
101 error = 0;
102 switch (cmd) {
103 case MEM_EXTRACT_PADDR:
104 me = (struct mem_extract *)data;
105
106 map = &td->td_proc->p_vmspace->vm_map;
107 vm_map_lock_read(map);
108 if (vm_map_lookup_entry(map, me->me_vaddr, &entry)) {
109 me->me_paddr = pmap_extract(
110 &td->td_proc->p_vmspace->vm_pmap, me->me_vaddr);
111 if (me->me_paddr != 0) {
112 me->me_state = ME_STATE_MAPPED;
113 me->me_domain = vm_phys_domain(me->me_paddr);
114 } else {
115 me->me_state = ME_STATE_VALID;
116 }
117 } else {
118 me->me_state = ME_STATE_INVALID;
119 }
120 vm_map_unlock_read(map);
121 break;
122 case MEM_KERNELDUMP:
123 marg = (const struct mem_livedump_arg *)data;
124 error = livedump_start(marg->fd, marg->flags, marg->compression);
125 break;
126 default:
127 error = memioctl_md(dev, cmd, data, flags, td);
128 break;
129 }
130 return (error);
131 }
132
133 /* ARGSUSED */
134 static int
mem_modevent(module_t mod __unused,int type,void * data __unused)135 mem_modevent(module_t mod __unused, int type, void *data __unused)
136 {
137 switch(type) {
138 case MOD_LOAD:
139 if (bootverbose)
140 printf("mem: <memory>\n");
141 mem_range_init();
142 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
143 UID_ROOT, GID_KMEM, 0640, "mem");
144 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
145 UID_ROOT, GID_KMEM, 0640, "kmem");
146 break;
147
148 case MOD_UNLOAD:
149 mem_range_destroy();
150 destroy_dev(memdev);
151 destroy_dev(kmemdev);
152 break;
153
154 case MOD_SHUTDOWN:
155 break;
156
157 default:
158 return(EOPNOTSUPP);
159 }
160
161 return (0);
162 }
163
164 DEV_MODULE(mem, mem_modevent, NULL);
165 MODULE_VERSION(mem, 1);
166