OsdEnvironment.c revision 217265 
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__FBSDID("$FreeBSD: head/sys/x86/acpica/OsdEnvironment.c 217265 2011-01-11 13:59:06Z jhb $");
30
31#include <sys/types.h>
32#include <sys/bus.h>
33#include <sys/sysctl.h>
34
35#include <contrib/dev/acpica/include/acpi.h>
36#include <contrib/dev/acpica/include/actables.h>
37
38static u_long acpi_root_phys;
39
40SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
41    "The physical address of the RSDP");
42
43ACPI_STATUS
44AcpiOsInitialize(void)
45{
46
47	return (AE_OK);
48}
49
50ACPI_STATUS
51AcpiOsTerminate(void)
52{
53
54	return (AE_OK);
55}
56
57static u_long
58acpi_get_root_from_loader(void)
59{
60	long acpi_root;
61
62	if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0)
63		return (acpi_root);
64
65	return (0);
66}
67
68static u_long
69acpi_get_root_from_memory(void)
70{
71	ACPI_SIZE acpi_root;
72
73	if (ACPI_SUCCESS(AcpiFindRootPointer(&acpi_root)))
74		return (acpi_root);
75
76	return (0);
77}
78
79ACPI_PHYSICAL_ADDRESS
80AcpiOsGetRootPointer(void)
81{
82
83	if (acpi_root_phys == 0) {
84		acpi_root_phys = acpi_get_root_from_loader();
85		if (acpi_root_phys == 0)
86			acpi_root_phys = acpi_get_root_from_memory();
87	}
88
89	return (acpi_root_phys);
90}
91