2 * Copyright (c) 2000,2001 Michael Smith
3 * Copyright (c) 2000 BSDi
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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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
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22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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26 * $DragonFly: src/sys/i386/acpica/Attic/OsdEnvironment.c,v 1.1 2003/09/24 03:32:16 drhodus Exp $
29 #include <sys/cdefs.h>
32 * 6.1 : Environmental support
34 #include <sys/types.h>
35 #include <sys/linker_set.h>
36 #include <sys/sysctl.h>
40 #include <machine/pc/bios.h>
42 u_long i386_acpi_root;
44 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &i386_acpi_root, 0,
45 "The physical address of the RSDP");
48 AcpiOsInitialize(void)
60 AcpiOsGetRootPointer(UINT32 Flags, ACPI_POINTER *RsdpPhysicalAddress)
65 if (i386_acpi_root == 0) {
67 * The loader passes the physical address at which it found the
68 * RSDP in a hint. We could recover this rather than searching
71 status = AcpiFindRootPointer(Flags, &ptr);
73 i386_acpi_root = ptr.Pointer.Physical;
77 RsdpPhysicalAddress->PointerType = ACPI_PHYSICAL_POINTER;
78 RsdpPhysicalAddress->Pointer.Physical = i386_acpi_root;