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 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/lock.h>
32 #include <sys/malloc.h>
33 #include <sys/memrange.h>
34 #include <sys/rwlock.h>
35 #include <sys/systm.h>
36
37 static struct rwlock mr_lock;
38
39 /*
40 * Implementation-neutral, kernel-callable functions for manipulating
41 * memory range attributes.
42 */
43 void
mem_range_init(void)44 mem_range_init(void)
45 {
46
47 if (mem_range_softc.mr_op == NULL)
48 return;
49 rw_init(&mr_lock, "memrange");
50 mem_range_softc.mr_op->init(&mem_range_softc);
51 }
52
53 void
mem_range_destroy(void)54 mem_range_destroy(void)
55 {
56
57 if (mem_range_softc.mr_op == NULL)
58 return;
59 rw_destroy(&mr_lock);
60 }
61
62 int
mem_range_attr_get(struct mem_range_desc * mrd,int * arg)63 mem_range_attr_get(struct mem_range_desc *mrd, int *arg)
64 {
65 int nd;
66
67 if (mem_range_softc.mr_op == NULL)
68 return (EOPNOTSUPP);
69 nd = *arg;
70 rw_rlock(&mr_lock);
71 if (nd == 0)
72 *arg = mem_range_softc.mr_ndesc;
73 else
74 bcopy(mem_range_softc.mr_desc, mrd, nd * sizeof(*mrd));
75 rw_runlock(&mr_lock);
76 return (0);
77 }
78
79 int
mem_range_attr_set(struct mem_range_desc * mrd,int * arg)80 mem_range_attr_set(struct mem_range_desc *mrd, int *arg)
81 {
82 int ret;
83
84 if (mem_range_softc.mr_op == NULL)
85 return (EOPNOTSUPP);
86 rw_wlock(&mr_lock);
87 ret = mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg);
88 rw_wunlock(&mr_lock);
89 return (ret);
90 }
91