1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2000,2001 Michael Smith
5 * Copyright (c) 2000 BSDi
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/param.h>
31 #include <sys/bus.h>
32 #include <sys/kernel.h>
33 #include <sys/sysctl.h>
34
35 #include <contrib/dev/acpica/include/acpi.h>
36 #include <contrib/dev/acpica/include/aclocal.h>
37 #include <contrib/dev/acpica/include/actables.h>
38
39 static u_long acpi_root_phys;
40
41 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
42 "The physical address of the RSDP");
43
44 ACPI_STATUS
AcpiOsInitialize(void)45 AcpiOsInitialize(void)
46 {
47
48 return (AE_OK);
49 }
50
51 ACPI_STATUS
AcpiOsTerminate(void)52 AcpiOsTerminate(void)
53 {
54
55 return (AE_OK);
56 }
57
58 static u_long
acpi_get_root_from_loader(void)59 acpi_get_root_from_loader(void)
60 {
61 long acpi_root;
62
63 if (TUNABLE_ULONG_FETCH("acpi.rsdp", &acpi_root))
64 return (acpi_root);
65
66 return (0);
67 }
68
69 static u_long
acpi_get_root_from_memory(void)70 acpi_get_root_from_memory(void)
71 {
72 ACPI_PHYSICAL_ADDRESS acpi_root;
73
74 if (ACPI_SUCCESS(AcpiFindRootPointer(&acpi_root)))
75 return (acpi_root);
76
77 return (0);
78 }
79
80 ACPI_PHYSICAL_ADDRESS
AcpiOsGetRootPointer(void)81 AcpiOsGetRootPointer(void)
82 {
83
84 if (acpi_root_phys == 0) {
85 acpi_root_phys = acpi_get_root_from_loader();
86 if (acpi_root_phys == 0)
87 acpi_root_phys = acpi_get_root_from_memory();
88 }
89
90 return (acpi_root_phys);
91 }
92