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/cdefs.h>
31 #include <sys/param.h>
32 #include <sys/conf.h>
33 #include <sys/fcntl.h>
34 #include <sys/ioccom.h>
35 #include <sys/kernel.h>
36 #include <sys/kerneldump.h>
37 #include <sys/lock.h>
38 #include <sys/malloc.h>
39 #include <sys/memrange.h>
40 #include <sys/module.h>
41 #include <sys/mutex.h>
42 #include <sys/priv.h>
43 #include <sys/proc.h>
44 #include <sys/signalvar.h>
45 #include <sys/systm.h>
46 #include <sys/uio.h>
47
48 #include <vm/vm.h>
49 #include <vm/vm_param.h>
50 #include <vm/pmap.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_object.h>
53 #include <vm/vm_page.h>
54 #include <vm/vm_phys.h>
55
56 #include <machine/memdev.h>
57
58 static struct cdev *memdev, *kmemdev;
59
60 static d_ioctl_t memioctl;
61
62 static struct cdevsw mem_cdevsw = {
63 .d_version = D_VERSION,
64 .d_flags = D_MEM,
65 .d_open = memopen,
66 .d_read = memrw,
67 .d_write = memrw,
68 .d_ioctl = memioctl,
69 .d_mmap = memmmap,
70 .d_name = "mem",
71 };
72
73 /* ARGSUSED */
74 int
memopen(struct cdev * dev __unused,int flags,int fmt __unused,struct thread * td)75 memopen(struct cdev *dev __unused, int flags, int fmt __unused,
76 struct thread *td)
77 {
78 int error = 0;
79
80 if (flags & FREAD)
81 error = priv_check(td, PRIV_KMEM_READ);
82 if (flags & FWRITE) {
83 if (error == 0)
84 error = priv_check(td, PRIV_KMEM_WRITE);
85 if (error == 0)
86 error = securelevel_gt(td->td_ucred, 0);
87 }
88
89 return (error);
90 }
91
92 static int
memioctl(struct cdev * dev,u_long cmd,caddr_t data,int flags,struct thread * td)93 memioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
94 struct thread *td)
95 {
96 vm_map_t map;
97 vm_map_entry_t entry;
98 const struct mem_livedump_arg *marg;
99 struct mem_extract *me;
100 int error;
101
102 error = 0;
103 switch (cmd) {
104 case MEM_EXTRACT_PADDR:
105 me = (struct mem_extract *)data;
106
107 map = &td->td_proc->p_vmspace->vm_map;
108 vm_map_lock_read(map);
109 if (vm_map_lookup_entry(map, me->me_vaddr, &entry)) {
110 me->me_paddr = pmap_extract(
111 &td->td_proc->p_vmspace->vm_pmap, me->me_vaddr);
112 if (me->me_paddr != 0) {
113 me->me_state = ME_STATE_MAPPED;
114 me->me_domain = vm_phys_domain(me->me_paddr);
115 } else {
116 me->me_state = ME_STATE_VALID;
117 }
118 } else {
119 me->me_state = ME_STATE_INVALID;
120 }
121 vm_map_unlock_read(map);
122 break;
123 case MEM_KERNELDUMP:
124 marg = (const struct mem_livedump_arg *)data;
125 error = livedump_start(marg->fd, marg->flags, marg->compression);
126 break;
127 default:
128 error = memioctl_md(dev, cmd, data, flags, td);
129 break;
130 }
131 return (error);
132 }
133
134 /* ARGSUSED */
135 static int
mem_modevent(module_t mod __unused,int type,void * data __unused)136 mem_modevent(module_t mod __unused, int type, void *data __unused)
137 {
138 switch(type) {
139 case MOD_LOAD:
140 if (bootverbose)
141 printf("mem: <memory>\n");
142 mem_range_init();
143 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
144 UID_ROOT, GID_KMEM, 0640, "mem");
145 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
146 UID_ROOT, GID_KMEM, 0640, "kmem");
147 break;
148
149 case MOD_UNLOAD:
150 mem_range_destroy();
151 destroy_dev(memdev);
152 destroy_dev(kmemdev);
153 break;
154
155 case MOD_SHUTDOWN:
156 break;
157
158 default:
159 return(EOPNOTSUPP);
160 }
161
162 return (0);
163 }
164
165 DEV_MODULE(mem, mem_modevent, NULL);
166 MODULE_VERSION(mem, 1);
167