22a69a5efe
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/** @file
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This module provides help function for finding ACPI table.
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Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "UefiLibInternal.h"
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#include <IndustryStandard/Acpi.h>
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/**
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This function locates next ACPI table in XSDT/RSDT based on Signature and
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previous returned Table.
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If PreviousTable is NULL:
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This function will locate the first ACPI table in XSDT/RSDT based on
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Signature in gEfiAcpi20TableGuid system configuration table first, and then
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gEfiAcpi10TableGuid system configuration table.
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This function will locate in XSDT first, and then RSDT.
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For DSDT, this function will locate XDsdt in FADT first, and then Dsdt in
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FADT.
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For FACS, this function will locate XFirmwareCtrl in FADT first, and then
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FirmwareCtrl in FADT.
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If PreviousTable is not NULL:
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1. If it could be located in XSDT in gEfiAcpi20TableGuid system configuration
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table, then this function will just locate next table in XSDT in
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gEfiAcpi20TableGuid system configuration table.
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2. If it could be located in RSDT in gEfiAcpi20TableGuid system configuration
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table, then this function will just locate next table in RSDT in
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gEfiAcpi20TableGuid system configuration table.
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3. If it could be located in RSDT in gEfiAcpi10TableGuid system configuration
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table, then this function will just locate next table in RSDT in
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gEfiAcpi10TableGuid system configuration table.
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It's not supported that PreviousTable is not NULL but PreviousTable->Signature
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is not same with Signature, NULL will be returned.
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@param Signature ACPI table signature.
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@param PreviousTable Pointer to previous returned table to locate next
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table, or NULL to locate first table.
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@return Next ACPI table or NULL if not found.
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**/
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EFI_ACPI_COMMON_HEADER *
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EFIAPI
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EfiLocateNextAcpiTable (
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IN UINT32 Signature,
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IN EFI_ACPI_COMMON_HEADER *PreviousTable OPTIONAL
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)
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{
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ASSERT (FALSE);
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return NULL;
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}
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/**
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This function locates first ACPI table in XSDT/RSDT based on Signature.
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This function will locate the first ACPI table in XSDT/RSDT based on
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Signature in gEfiAcpi20TableGuid system configuration table first, and then
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gEfiAcpi10TableGuid system configuration table.
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This function will locate in XSDT first, and then RSDT.
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For DSDT, this function will locate XDsdt in FADT first, and then Dsdt in
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FADT.
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For FACS, this function will locate XFirmwareCtrl in FADT first, and then
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FirmwareCtrl in FADT.
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@param Signature ACPI table signature.
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@return First ACPI table or NULL if not found.
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**/
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EFI_ACPI_COMMON_HEADER *
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EFIAPI
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EfiLocateFirstAcpiTable (
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IN UINT32 Signature
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)
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{
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return EfiLocateNextAcpiTable (Signature, NULL);
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}
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