1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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__FBSDID("$FreeBSD$");
32
33#include <sys/param.h>
34#include <sys/conf.h>
35#include <sys/fcntl.h>
36#include <sys/ioccom.h>
37#include <sys/kernel.h>
38#include <sys/lock.h>
39#include <sys/malloc.h>
40#include <sys/memrange.h>
41#include <sys/module.h>
42#include <sys/mutex.h>
43#include <sys/priv.h>
44#include <sys/proc.h>
45#include <sys/signalvar.h>
46#include <sys/systm.h>
47#include <sys/uio.h>
48
49#include <vm/vm.h>
50#include <vm/vm_param.h>
51#include <vm/pmap.h>
52#include <vm/vm_map.h>
53#include <vm/vm_object.h>
54#include <vm/vm_page.h>
55#include <vm/vm_phys.h>
56
57#include <machine/memdev.h>
58
59static struct cdev *memdev, *kmemdev;
60
61static d_ioctl_t memioctl;
62
63static struct cdevsw mem_cdevsw = {
64	.d_version =	D_VERSION,
65	.d_flags =	D_MEM,
66	.d_open =	memopen,
67	.d_read =	memrw,
68	.d_write =	memrw,
69	.d_ioctl =	memioctl,
70	.d_mmap =	memmmap,
71	.d_name =	"mem",
72};
73
74/* ARGSUSED */
75int
76memopen(struct cdev *dev __unused, int flags, int fmt __unused,
77    struct thread *td)
78{
79	int error = 0;
80
81	if (flags & FREAD)
82		error = priv_check(td, PRIV_KMEM_READ);
83	if (flags & FWRITE) {
84		if (error == 0)
85			error = priv_check(td, PRIV_KMEM_WRITE);
86		if (error == 0)
87			error = securelevel_gt(td->td_ucred, 0);
88	}
89
90	return (error);
91}
92
93static int
94memioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
95    struct thread *td)
96{
97	vm_map_t map;
98	vm_map_entry_t entry;
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	default:
124		error = memioctl_md(dev, cmd, data, flags, td);
125		break;
126	}
127	return (error);
128}
129
130/* ARGSUSED */
131static int
132mem_modevent(module_t mod __unused, int type, void *data __unused)
133{
134	switch(type) {
135	case MOD_LOAD:
136		if (bootverbose)
137			printf("mem: <memory>\n");
138		mem_range_init();
139		memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
140			UID_ROOT, GID_KMEM, 0640, "mem");
141		kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
142			UID_ROOT, GID_KMEM, 0640, "kmem");
143		break;
144
145	case MOD_UNLOAD:
146		mem_range_destroy();
147		destroy_dev(memdev);
148		destroy_dev(kmemdev);
149		break;
150
151	case MOD_SHUTDOWN:
152		break;
153
154	default:
155		return(EOPNOTSUPP);
156
157	}
158
159	return (0);
160}
161
162DEV_MODULE(mem, mem_modevent, NULL);
163MODULE_VERSION(mem, 1);
164