2 files changed, 89 insertions, 0 deletions
diff --git a/IntelFrameworkPkg/Library/FrameworkUefiLib/Acpi.c b/IntelFrameworkPkg/Library/FrameworkUefiLib/Acpi.c
new file mode 100644
index 0000000000..4b41abd036
--- /dev/null
+++ b/IntelFrameworkPkg/Library/FrameworkUefiLib/Acpi.c
@@ -0,0 +1,88 @@
+/** @file
+  This module provides help function for finding ACPI table.
+
+  Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php.
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "UefiLibInternal.h"
+#include <IndustryStandard/Acpi.h>
+
+/**
+  This function locates next ACPI table in XSDT/RSDT based on Signature and
+  previous returned Table.
+
+  If PreviousTable is NULL:
+  This function will locate the first ACPI table in XSDT/RSDT based on
+  Signature in gEfiAcpi20TableGuid system configuration table first, and then
+  gEfiAcpi10TableGuid system configuration table.
+  This function will locate in XSDT first, and then RSDT.
+  For DSDT, this function will locate XDsdt in FADT first, and then Dsdt in
+  FADT.
+  For FACS, this function will locate XFirmwareCtrl in FADT first, and then
+  FirmwareCtrl in FADT.
+
+  If PreviousTable is not NULL:
+  1. If it could be located in XSDT in gEfiAcpi20TableGuid system configuration
+     table, then this function will just locate next table in XSDT in
+     gEfiAcpi20TableGuid system configuration table.
+  2. If it could be located in RSDT in gEfiAcpi20TableGuid system configuration
+     table, then this function will just locate next table in RSDT in
+     gEfiAcpi20TableGuid system configuration table.
+  3. If it could be located in RSDT in gEfiAcpi10TableGuid system configuration
+     table, then this function will just locate next table in RSDT in
+     gEfiAcpi10TableGuid system configuration table.
+
+  It's not supported that PreviousTable is not NULL but PreviousTable->Signature
+  is not same with Signature, NULL will be returned.
+
+  @param Signature          ACPI table signature.
+  @param PreviousTable      Pointer to previous returned table to locate next
+                            table, or NULL to locate first table.
+
+  @return Next ACPI table or NULL if not found.
+
+**/
+EFI_ACPI_COMMON_HEADER *
+EFIAPI
+EfiLocateNextAcpiTable (
+  IN UINT32                     Signature,
+  IN EFI_ACPI_COMMON_HEADER     *PreviousTable OPTIONAL
+  )
+{
+  ASSERT (FALSE);
+  return NULL;
+}
+
+/**
+  This function locates first ACPI table in XSDT/RSDT based on Signature.
+
+  This function will locate the first ACPI table in XSDT/RSDT based on
+  Signature in gEfiAcpi20TableGuid system configuration table first, and then
+  gEfiAcpi10TableGuid system configuration table.
+  This function will locate in XSDT first, and then RSDT.
+  For DSDT, this function will locate XDsdt in FADT first, and then Dsdt in
+  FADT.
+  For FACS, this function will locate XFirmwareCtrl in FADT first, and then
+  FirmwareCtrl in FADT.
+
+  @param Signature          ACPI table signature.
+
+  @return First ACPI table or NULL if not found.
+
+**/
+EFI_ACPI_COMMON_HEADER *
+EFIAPI
+EfiLocateFirstAcpiTable (
+  IN UINT32                     Signature
+  )
+{
+  return EfiLocateNextAcpiTable (Signature, NULL);
+}
diff --git a/IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf b/IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf
index 182d20fca0..086d898ee7 100644
--- a/IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf
+++ b/IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf
@@ -37,6 +37,7 @@
   Console.c
   UefiLib.c
   UefiLibInternal.h
+  Acpi.c
 
 [Packages]
   MdePkg/MdePkg.dec