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 * $FreeBSD: src/sys/i386/acpica/OsdEnvironment.c,v 1.10 2004/05/06 02:18:58 njl Exp $
28 */
29
30 /*
31 * Environmental and ACPI Tables (partial)
32 */
33
34 #include <sys/types.h>
35 #include <sys/linker_set.h>
36 #include <sys/sysctl.h>
37
38 #include <machine/vmparam.h>
39
40 #include "acpi.h"
41
42 static u_long acpi_root_phys;
43
44 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
45 "The physical address of the RSDP");
46
47 ACPI_STATUS
AcpiOsInitialize(void)48 AcpiOsInitialize(void)
49 {
50 return (AE_OK);
51 }
52
53 ACPI_STATUS
AcpiOsTerminate(void)54 AcpiOsTerminate(void)
55 {
56 return (AE_OK);
57 }
58
59 ACPI_PHYSICAL_ADDRESS
AcpiOsGetRootPointer(void)60 AcpiOsGetRootPointer(void)
61 {
62 ACPI_SIZE ptr;
63 ACPI_STATUS status;
64 u_long acpi_root;
65
66 if (acpi_root_phys == 0) {
67 /*
68 * The loader passes the physical address at which it found the
69 * RSDP in a hint. We try to recover this before searching
70 * manually here.
71 */
72 if (kgetenv_ulong("hint.acpi.0.rsdp", &acpi_root) == 1) {
73 acpi_root_phys = acpi_root;
74 } else {
75 status = AcpiFindRootPointer(&ptr);
76 if (ACPI_SUCCESS(status))
77 acpi_root_phys = ptr;
78 }
79 }
80
81 return (acpi_root_phys);
82 }
83