OsdEnvironment.c revision 114349 
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 114349 2003-05-01 01:05:25Z peter $
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
39u_long i386_acpi_root;
40
41SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &i386_acpi_root, 0,
42    "The physical address of the RSDP");
43
44ACPI_STATUS
45AcpiOsInitialize(void)
46{
47	return(0);
48}
49
50ACPI_STATUS
51AcpiOsTerminate(void)
52{
53	return(0);
54}
55
56ACPI_STATUS
57AcpiOsGetRootPointer(UINT32 Flags, ACPI_POINTER *RsdpPhysicalAddress)
58{
59	ACPI_POINTER ptr;
60	ACPI_STATUS status;
61
62	if (i386_acpi_root == 0) {
63		/*
64		 * The loader passes the physical address at which it found the
65		 * RSDP in a hint.  We could recover this rather than searching
66		 * manually here.
67		 */
68		status = AcpiFindRootPointer(Flags, &ptr);
69		if (status == AE_OK)
70			i386_acpi_root = ptr.Pointer.Physical;
71	} else
72		status = AE_OK;
73
74	RsdpPhysicalAddress->PointerType = ACPI_PHYSICAL_POINTER;
75	RsdpPhysicalAddress->Pointer.Physical = i386_acpi_root;
76	return (status);
77}
78