/** @file
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PCH SMM private lib.
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Copyright (c) 2021, 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 <Uefi/UefiBaseType.h>
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#include <Library/BaseLib.h>
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#include <Library/IoLib.h>
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#include <Library/DebugLib.h>
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#include <Register/CommonMsr.h>
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/**
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Set InSmm.Sts bit
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**/
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VOID
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PchSetInSmmSts (
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VOID
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)
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{
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UINT32 Data32;
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///
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/// Read memory location FED30880h OR with 00000001h, place the result in EAX,
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/// and write data to lower 32 bits of MSR 1FEh (sample code available)
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///
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Data32 = MmioRead32 (0xFED30880);
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AsmWriteMsr32 (MSR_SPCL_CHIPSET_USAGE, Data32 | BIT0);
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///
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/// Read FED30880h back to ensure the setting went through.
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///
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Data32 = MmioRead32 (0xFED30880);
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}
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/**
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Clear InSmm.Sts bit
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**/
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VOID
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PchClearInSmmSts (
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VOID
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)
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{
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UINT32 Data32;
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///
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/// Read memory location FED30880h AND with FFFFFFFEh, place the result in EAX,
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/// and write data to lower 32 bits of MSR 1FEh (sample code available)
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///
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Data32 = MmioRead32 (0xFED30880);
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AsmWriteMsr32 (MSR_SPCL_CHIPSET_USAGE, Data32 & (UINT32) (~BIT0));
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///
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/// Read FED30880h back to ensure the setting went through.
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///
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Data32 = MmioRead32 (0xFED30880);
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}
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