91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*-
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* Copyright (c) 2000,2001 Michael Smith
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* Copyright (c) 2000 BSDi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/bus.h>
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#include <sys/sysctl.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/actables.h>
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static u_long acpi_root_phys;
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SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
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"The physical address of the RSDP");
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ACPI_STATUS
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AcpiOsInitialize(void)
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{
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return (AE_OK);
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}
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ACPI_STATUS
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AcpiOsTerminate(void)
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{
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return (AE_OK);
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}
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static u_long
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acpi_get_root_from_loader(void)
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{
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long acpi_root;
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if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0)
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return (acpi_root);
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return (0);
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}
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static u_long
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acpi_get_root_from_memory(void)
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{
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ACPI_PHYSICAL_ADDRESS acpi_root;
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if (ACPI_SUCCESS(AcpiFindRootPointer(&acpi_root)))
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return (acpi_root);
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return (0);
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}
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ACPI_PHYSICAL_ADDRESS
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AcpiOsGetRootPointer(void)
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{
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if (acpi_root_phys == 0) {
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acpi_root_phys = acpi_get_root_from_loader();
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if (acpi_root_phys == 0)
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acpi_root_phys = acpi_get_root_from_memory();
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}
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return (acpi_root_phys);
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}
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