OsdEnvironment.c revision 128990 
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/amd64/acpica/OsdEnvironment.c 128990 2004-05-06 02:18:58Z njl $");
30
31/*
32 * 6.1 : Environmental support
33 */
34#include <sys/types.h>
35#include <sys/linker_set.h>
36#include <sys/sysctl.h>
37
38#include "acpi.h"
39
40static u_long amd64_acpi_root;
41
42SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &amd64_acpi_root, 0,
43	     "The physical address of the RSDP");
44
45ACPI_STATUS
46AcpiOsInitialize(void)
47{
48	return(0);
49}
50
51ACPI_STATUS
52AcpiOsTerminate(void)
53{
54	return(0);
55}
56
57ACPI_STATUS
58AcpiOsGetRootPointer(UINT32 Flags, ACPI_POINTER *RsdpPhysicalAddress)
59{
60	ACPI_POINTER ptr;
61	ACPI_STATUS status;
62
63	if (amd64_acpi_root == 0) {
64		/*
65		 * The loader passes the physical address at which it found the
66		 * RSDP in a hint.  We could recover this rather than searching
67		 * manually here.
68		 */
69		status = AcpiFindRootPointer(Flags, &ptr);
70		if (status == AE_OK)
71			amd64_acpi_root = ptr.Pointer.Physical;
72	} else
73		status = AE_OK;
74
75	RsdpPhysicalAddress->PointerType = ACPI_PHYSICAL_POINTER;
76	RsdpPhysicalAddress->Pointer.Physical = amd64_acpi_root;
77	return (status);
78}
79