1 /*-
2 * Copyright (c) 2000,2001 Michael Smith
3 * Copyright (c) 2000 BSDi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #include <sys/types.h>
30 #include <sys/bus.h>
31 #include <sys/kernel.h>
32 #include <sys/sysctl.h>
33
34 #include <contrib/dev/acpica/include/acpi.h>
35 #include <contrib/dev/acpica/include/aclocal.h>
36 #include <contrib/dev/acpica/include/actables.h>
37
38 static u_long acpi_root_phys;
39
40 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
41 "The physical address of the RSDP");
42
43 ACPI_STATUS
AcpiOsInitialize(void)44 AcpiOsInitialize(void)
45 {
46
47 return (AE_OK);
48 }
49
50 ACPI_STATUS
AcpiOsTerminate(void)51 AcpiOsTerminate(void)
52 {
53
54 return (AE_OK);
55 }
56
57 static u_long
acpi_get_root_from_loader(void)58 acpi_get_root_from_loader(void)
59 {
60 long acpi_root;
61
62 if (TUNABLE_ULONG_FETCH("acpi.rsdp", &acpi_root))
63 return (acpi_root);
64
65 /*
66 * The hints mechanism is considered legacy and has been replaced
67 * by the tunable method, but is used here as a fallback to
68 * retain maximum compatibility between old loaders and new
69 * kernels. It can be removed after 14.0R.
70 */
71 if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0)
72 return (acpi_root);
73
74 return (0);
75 }
76
77 ACPI_PHYSICAL_ADDRESS
AcpiOsGetRootPointer(void)78 AcpiOsGetRootPointer(void)
79 {
80
81 if (acpi_root_phys == 0)
82 acpi_root_phys = acpi_get_root_from_loader();
83
84 return (acpi_root_phys);
85 }
86