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-rw-r--r--PcAtChipsetPkg/Library/AcpiTimerLib/DxeStandaloneMmAcpiTimerLib.h24
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diff --git a/PcAtChipsetPkg/Library/AcpiTimerLib/DxeStandaloneMmAcpiTimerLib.h b/PcAtChipsetPkg/Library/AcpiTimerLib/DxeStandaloneMmAcpiTimerLib.h
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index 0000000000..6015d684e5
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+++ b/PcAtChipsetPkg/Library/AcpiTimerLib/DxeStandaloneMmAcpiTimerLib.h
@@ -0,0 +1,24 @@
+/** @file
+ Header file internal to ACPI TimerLib.
+
+Copyright (c) Microsoft Corporation.
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+#ifndef _DXE_STANDALONE_MM_ACPI_TIMER_LIB_H_
+#define _DXE_STANDALONE_MM_ACPI_TIMER_LIB_H_
+
+/**
+ The constructor function enables ACPI IO space, and caches PerformanceCounterFrequency.
+
+ @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.
+
+**/
+EFI_STATUS
+CommonAcpiTimerLibConstructor (
+ VOID
+ );
+
+#endif