1/*-
2 * Copyright (c) 2004 Mark R V Murray
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/lock.h>
33#include <sys/malloc.h>
34#include <sys/memrange.h>
35#include <sys/rwlock.h>
36#include <sys/systm.h>
37
38static struct rwlock	mr_lock;
39
40/*
41 * Implementation-neutral, kernel-callable functions for manipulating
42 * memory range attributes.
43 */
44void
45mem_range_init(void)
46{
47
48	if (mem_range_softc.mr_op == NULL)
49		return;
50	rw_init(&mr_lock, "memrange");
51	mem_range_softc.mr_op->init(&mem_range_softc);
52}
53
54void
55mem_range_destroy(void)
56{
57
58	if (mem_range_softc.mr_op == NULL)
59		return;
60	rw_destroy(&mr_lock);
61}
62
63int
64mem_range_attr_get(struct mem_range_desc *mrd, int *arg)
65{
66	int nd;
67
68	if (mem_range_softc.mr_op == NULL)
69		return (EOPNOTSUPP);
70	nd = *arg;
71	rw_rlock(&mr_lock);
72	if (nd == 0)
73		*arg = mem_range_softc.mr_ndesc;
74	else
75		bcopy(mem_range_softc.mr_desc, mrd, nd * sizeof(*mrd));
76	rw_runlock(&mr_lock);
77	return (0);
78}
79
80int
81mem_range_attr_set(struct mem_range_desc *mrd, int *arg)
82{
83	int ret;
84
85	if (mem_range_softc.mr_op == NULL)
86		return (EOPNOTSUPP);
87	rw_wlock(&mr_lock);
88	ret = mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg);
89	rw_wunlock(&mr_lock);
90	return (ret);
91}
92