2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004 Mark R V Murray
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
35 #include <sys/fcntl.h>
36 #include <sys/ioccom.h>
37 #include <sys/kernel.h>
38 #include <sys/kerneldump.h>
40 #include <sys/malloc.h>
41 #include <sys/memrange.h>
42 #include <sys/module.h>
43 #include <sys/mutex.h>
46 #include <sys/signalvar.h>
47 #include <sys/systm.h>
51 #include <vm/vm_param.h>
53 #include <vm/vm_map.h>
54 #include <vm/vm_object.h>
55 #include <vm/vm_page.h>
56 #include <vm/vm_phys.h>
58 #include <machine/memdev.h>
60 static struct cdev *memdev, *kmemdev;
62 static d_ioctl_t memioctl;
64 static struct cdevsw mem_cdevsw = {
65 .d_version = D_VERSION,
77 memopen(struct cdev *dev __unused, int flags, int fmt __unused,
83 error = priv_check(td, PRIV_KMEM_READ);
86 error = priv_check(td, PRIV_KMEM_WRITE);
88 error = securelevel_gt(td->td_ucred, 0);
95 memioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
100 const struct mem_livedump_arg *marg;
101 struct mem_extract *me;
106 case MEM_EXTRACT_PADDR:
107 me = (struct mem_extract *)data;
109 map = &td->td_proc->p_vmspace->vm_map;
110 vm_map_lock_read(map);
111 if (vm_map_lookup_entry(map, me->me_vaddr, &entry)) {
112 me->me_paddr = pmap_extract(
113 &td->td_proc->p_vmspace->vm_pmap, me->me_vaddr);
114 if (me->me_paddr != 0) {
115 me->me_state = ME_STATE_MAPPED;
116 me->me_domain = vm_phys_domain(me->me_paddr);
118 me->me_state = ME_STATE_VALID;
121 me->me_state = ME_STATE_INVALID;
123 vm_map_unlock_read(map);
126 marg = (const struct mem_livedump_arg *)data;
127 error = livedump_start(marg->fd, marg->flags, marg->compression);
130 error = memioctl_md(dev, cmd, data, flags, td);
138 mem_modevent(module_t mod __unused, int type, void *data __unused)
143 printf("mem: <memory>\n");
145 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
146 UID_ROOT, GID_KMEM, 0640, "mem");
147 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
148 UID_ROOT, GID_KMEM, 0640, "kmem");
154 destroy_dev(kmemdev);
167 DEV_MODULE(mem, mem_modevent, NULL);
168 MODULE_VERSION(mem, 1);