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
57static struct cdev *memdev, *kmemdev;
58
59static d_ioctl_t memioctl;
60
61static 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 */
73int
74memopen(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
91static int
92memioctl(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 */
134static int
135mem_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
164DEV_MODULE(mem, mem_modevent, NULL);
165MODULE_VERSION(mem, 1);
166