OsdEnvironment.c revision 108026 
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: head/sys/amd64/acpica/OsdEnvironment.c 108026 2002-12-18 08:47:07Z marcel $
28 */
29
30/*
31 * 6.1 : Environmental support
32 */
33#include <sys/types.h>
34#include <sys/linker_set.h>
35#include <sys/sysctl.h>
36
37#include "acpi.h"
38
39#include <machine/pc/bios.h>
40
41u_long i386_acpi_root;
42
43SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &i386_acpi_root, 0,
44    "The physical address of the RSDP");
45
46ACPI_STATUS
47AcpiOsInitialize(void)
48{
49	return(0);
50}
51
52ACPI_STATUS
53AcpiOsTerminate(void)
54{
55	return(0);
56}
57
58ACPI_STATUS
59AcpiOsGetRootPointer(UINT32 Flags, ACPI_POINTER *RsdpPhysicalAddress)
60{
61	ACPI_POINTER ptr;
62	ACPI_STATUS status;
63
64	if (i386_acpi_root == 0) {
65		/*
66		 * The loader passes the physical address at which it found the
67		 * RSDP in a hint.  We could recover this rather than searching
68		 * manually here.
69		 */
70		status = AcpiFindRootPointer(Flags, &ptr);
71		if (status == AE_OK)
72			i386_acpi_root = ptr.Pointer.Physical;
73	} else
74		status = AE_OK;
75
76	RsdpPhysicalAddress->PointerType = ACPI_PHYSICAL_POINTER;
77	RsdpPhysicalAddress->Pointer.Physical = i386_acpi_root;
78	return (status);
79}
80