SecurityPkg: Tcg2Smm: Separate Tcg2Smm into 2 modules

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3169

This change separated the original Tcg2Smm module into 2 drivers: the
SMM driver that registers callback for physical presence and memory
clear; the Tcg2Acpi driver that patches and publishes ACPI table for
runtime use.

Tcg2Smm introduced an SMI root handler to allow Tcg2Acpi to communicate
the NVS region used by Tpm.asl and exchange the registered SwSmiValue.

Lastly, Tcg2Smm driver will publish gTcg2MmSwSmiRegisteredGuid at the end
of entrypoint to ensure Tcg2Acpi to load after Tcg2Smm is ready to
communicate.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>

Signed-off-by: Kun Qin <kun.q@outlook.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Message-Id: <MWHPR06MB310295CC623EF7C062844DFFF3969@MWHPR06MB3102.namprd06.prod.outlook.com>

3 files changed, 1506 insertions, 0 deletions

diff --git a/SecurityPkg/Tcg/Tcg2Acpi/Tcg2Acpi.c b/SecurityPkg/Tcg/Tcg2Acpi/Tcg2Acpi.c
new file mode 100644
index 0000000..924c3b4
--- /dev/null
+++ b/SecurityPkg/Tcg/Tcg2Acpi/Tcg2Acpi.c
@@ -0,0 +1,896 @@
+/** @file

+  This driver implements TPM 2.0 definition block in ACPI table and

+  populates registered SMI callback functions for Tcg2 physical presence

+  and MemoryClear to handle the requests for ACPI method. It needs to be

+  used together with Tcg2 MM drivers to exchange information on registered

+  SwSmiValue and allocated NVS region address.

+

+  Caution: This module requires additional review when modified.

+  This driver will have external input - variable and ACPINvs data in SMM mode.

+  This external input must be validated carefully to avoid security issue.

+

+Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>

+Copyright (c) Microsoft Corporation.

+SPDX-License-Identifier: BSD-2-Clause-Patent

+

+**/

+

+#include <PiDxe.h>

+

+#include <IndustryStandard/Tpm2Acpi.h>

+

+#include <Guid/TpmInstance.h>

+#include <Guid/TpmNvsMm.h>

+#include <Guid/PiSmmCommunicationRegionTable.h>

+

+#include <Protocol/AcpiTable.h>

+#include <Protocol/Tcg2Protocol.h>

+#include <Protocol/MmCommunication.h>

+

+#include <Library/BaseLib.h>

+#include <Library/BaseMemoryLib.h>

+#include <Library/DxeServicesLib.h>

+#include <Library/UefiBootServicesTableLib.h>

+#include <Library/DebugLib.h>

+#include <Library/PcdLib.h>

+#include <Library/PrintLib.h>

+#include <Library/TpmMeasurementLib.h>

+#include <Library/Tpm2DeviceLib.h>

+#include <Library/Tpm2CommandLib.h>

+#include <Library/UefiLib.h>

+

+//

+// Physical Presence Interface Version supported by Platform

+//

+#define PHYSICAL_PRESENCE_VERSION_TAG                              "$PV"

+#define PHYSICAL_PRESENCE_VERSION_SIZE                             4

+

+//

+// PNP _HID for TPM2 device

+//

+#define TPM_HID_TAG                                                "NNNN0000"

+#define TPM_HID_PNP_SIZE                                           8

+#define TPM_HID_ACPI_SIZE                                          9

+

+#define TPM_PRS_RESL                                               "RESL"

+#define TPM_PRS_RESS                                               "RESS"

+#define TPM_PRS_RES_NAME_SIZE                                      4

+//

+// Minimum PRS resource template size

+//  1 byte    for  BufferOp

+//  1 byte    for  PkgLength

+//  2 bytes   for  BufferSize

+//  12 bytes  for  Memory32Fixed descriptor

+//  5 bytes   for  Interrupt descriptor

+//  2 bytes   for  END Tag

+//

+#define TPM_POS_RES_TEMPLATE_MIN_SIZE                              (1 + 1 + 2 + 12 + 5 + 2)

+

+//

+// Max Interrupt buffer size for PRS interrupt resource

+// Now support 15 interrupts in maxmum

+//

+#define MAX_PRS_INT_BUF_SIZE                                       (15*4)

+

+#pragma pack(1)

+

+typedef struct {

+  EFI_ACPI_DESCRIPTION_HEADER Header;

+  // Flags field is replaced in version 4 and above

+  //    BIT0~15:  PlatformClass      This field is only valid for version 4 and above

+  //    BIT16~31: Reserved

+  UINT32                      Flags;

+  UINT64                      AddressOfControlArea;

+  UINT32                      StartMethod;

+  UINT8                       PlatformSpecificParameters[12];  // size up to 12

+  UINT32                      Laml;                          // Optional

+  UINT64                      Lasa;                          // Optional

+} EFI_TPM2_ACPI_TABLE_V4;

+

+#pragma pack()

+

+EFI_TPM2_ACPI_TABLE_V4  mTpm2AcpiTemplate = {

+  {

+    EFI_ACPI_5_0_TRUSTED_COMPUTING_PLATFORM_2_TABLE_SIGNATURE,

+    sizeof (mTpm2AcpiTemplate),

+    EFI_TPM2_ACPI_TABLE_REVISION,

+    //

+    // Compiler initializes the remaining bytes to 0

+    // These fields should be filled in in production

+    //

+  },

+  0, // BIT0~15:  PlatformClass

+     // BIT16~31: Reserved

+  0, // Control Area

+  EFI_TPM2_ACPI_TABLE_START_METHOD_TIS, // StartMethod

+};

+

+TCG_NVS                    *mTcgNvs;

+

+/**

+  Find the operation region in TCG ACPI table by given Name and Size,

+  and initialize it if the region is found.

+

+  @param[in, out] Table          The TPM item in ACPI table.

+  @param[in]      Name           The name string to find in TPM table.

+  @param[in]      Size           The size of the region to find.

+

+  @return                        The allocated address for the found region.

+

+**/

+VOID *

+AssignOpRegion (

+  EFI_ACPI_DESCRIPTION_HEADER    *Table,

+  UINT32                         Name,

+  UINT16                         Size

+  )

+{

+  EFI_STATUS                     Status;

+  AML_OP_REGION_32_8             *OpRegion;

+  EFI_PHYSICAL_ADDRESS           MemoryAddress;

+

+  MemoryAddress = SIZE_4GB - 1;

+

+  //

+  // Patch some pointers for the ASL code before loading the SSDT.

+  //

+  for (OpRegion  = (AML_OP_REGION_32_8 *) (Table + 1);

+       OpRegion <= (AML_OP_REGION_32_8 *) ((UINT8 *) Table + Table->Length);

+       OpRegion  = (AML_OP_REGION_32_8 *) ((UINT8 *) OpRegion + 1)) {

+    if ((OpRegion->OpRegionOp  == AML_EXT_REGION_OP) &&

+        (OpRegion->NameString  == Name) &&

+        (OpRegion->DWordPrefix == AML_DWORD_PREFIX) &&

+        (OpRegion->BytePrefix  == AML_BYTE_PREFIX)) {

+

+      Status = gBS->AllocatePages(AllocateMaxAddress, EfiACPIMemoryNVS, EFI_SIZE_TO_PAGES (Size), &MemoryAddress);

+      ASSERT_EFI_ERROR (Status);

+      ZeroMem ((VOID *)(UINTN)MemoryAddress, Size);

+      OpRegion->RegionOffset = (UINT32) (UINTN) MemoryAddress;

+      OpRegion->RegionLen    = (UINT8) Size;

+      break;

+    }

+  }

+

+  return (VOID *) (UINTN) MemoryAddress;

+}

+

+/**

+  Locate the MM communication buffer and protocol, then use it to exchange information with

+  Tcg2StandaloneMmm on NVS address and SMI value.

+

+  @param[in, out] TcgNvs         The NVS subject to send to MM environment.

+

+  @return                        The status for locating MM common buffer, communicate to MM, etc.

+

+**/

+EFI_STATUS

+EFIAPI

+ExchangeCommonBuffer (

+  IN OUT  TCG_NVS                 *TcgNvs

+)

+{

+  EFI_STATUS                                Status;

+  EFI_MM_COMMUNICATION_PROTOCOL             *MmCommunication;

+  EDKII_PI_SMM_COMMUNICATION_REGION_TABLE   *PiSmmCommunicationRegionTable;

+  EFI_MEMORY_DESCRIPTOR                     *MmCommMemRegion;

+  EFI_MM_COMMUNICATE_HEADER                 *CommHeader;

+  TPM_NVS_MM_COMM_BUFFER                    *CommBuffer;

+  UINTN                                     CommBufferSize;

+  UINTN                                     Index;

+

+  // Step 0: Sanity check for input argument

+  if (TcgNvs == NULL) {

+    DEBUG ((DEBUG_ERROR, "%a - Input argument is NULL!\n", __FUNCTION__));

+    return EFI_INVALID_PARAMETER;

+  }

+

+  // Step 1: Grab the common buffer header

+  Status = EfiGetSystemConfigurationTable (&gEdkiiPiSmmCommunicationRegionTableGuid, (VOID**) &PiSmmCommunicationRegionTable);

+  if (EFI_ERROR (Status)) {

+    DEBUG ((DEBUG_ERROR, "%a - Failed to locate SMM communciation common buffer - %r!\n", __FUNCTION__, Status));

+    return Status;

+  }

+

+  // Step 2: Grab one that is large enough to hold TPM_NVS_MM_COMM_BUFFER, the IPL one should be sufficient

+  CommBufferSize = 0;

+  MmCommMemRegion = (EFI_MEMORY_DESCRIPTOR*) (PiSmmCommunicationRegionTable + 1);

+  for (Index = 0; Index < PiSmmCommunicationRegionTable->NumberOfEntries; Index++) {

+    if (MmCommMemRegion->Type == EfiConventionalMemory) {

+      CommBufferSize = EFI_PAGES_TO_SIZE ((UINTN)MmCommMemRegion->NumberOfPages);

+      if (CommBufferSize >= (sizeof (TPM_NVS_MM_COMM_BUFFER) + OFFSET_OF (EFI_MM_COMMUNICATE_HEADER, Data))) {

+        break;

+      }

+    }

+    MmCommMemRegion = (EFI_MEMORY_DESCRIPTOR*)((UINT8*)MmCommMemRegion + PiSmmCommunicationRegionTable->DescriptorSize);

+  }

+

+  if (Index >= PiSmmCommunicationRegionTable->NumberOfEntries) {

+    // Could not find one that meets our goal...

+    DEBUG ((DEBUG_ERROR, "%a - Could not find a common buffer that is big enough for NVS!\n", __FUNCTION__));

+    return EFI_OUT_OF_RESOURCES;

+  }

+

+  // Step 3: Start to populate contents

+  // Step 3.1: MM Communication common header

+  CommHeader = (EFI_MM_COMMUNICATE_HEADER *) (UINTN) MmCommMemRegion->PhysicalStart;

+  CommBufferSize = sizeof (TPM_NVS_MM_COMM_BUFFER) + OFFSET_OF (EFI_MM_COMMUNICATE_HEADER, Data);

+  ZeroMem (CommHeader, CommBufferSize);

+  CopyGuid (&CommHeader->HeaderGuid, &gTpmNvsMmGuid);

+  CommHeader->MessageLength = sizeof (TPM_NVS_MM_COMM_BUFFER);

+

+  // Step 3.2: TPM_NVS_MM_COMM_BUFFER content per our needs

+  CommBuffer = (TPM_NVS_MM_COMM_BUFFER *) (CommHeader->Data);

+  CommBuffer->Function = TpmNvsMmExchangeInfo;

+  CommBuffer->TargetAddress = (EFI_PHYSICAL_ADDRESS) (UINTN) TcgNvs;

+

+  // Step 4: Locate the protocol and signal Mmi.

+  Status = gBS->LocateProtocol (&gEfiMmCommunicationProtocolGuid, NULL, (VOID**) &MmCommunication);

+  if (!EFI_ERROR (Status)) {

+    Status = MmCommunication->Communicate (MmCommunication, CommHeader, &CommBufferSize);

+    DEBUG ((DEBUG_INFO, "%a - Communicate() = %r\n", __FUNCTION__, Status));

+  }

+  else {

+    DEBUG ((DEBUG_ERROR, "%a - Failed to locate MmCommunication protocol - %r\n", __FUNCTION__, Status));

+    return Status;

+  }

+

+  // Step 5: If everything goes well, populate the channel number

+  if (!EFI_ERROR (CommBuffer->ReturnStatus)) {

+    // Need to demote to UINT8 according to SMI value definition

+    TcgNvs->PhysicalPresence.SoftwareSmi = (UINT8) CommBuffer->RegisteredPpSwiValue;

+    TcgNvs->MemoryClear.SoftwareSmi = (UINT8) CommBuffer->RegisteredMcSwiValue;

+    DEBUG ((

+      DEBUG_INFO,

+      "%a Communication returned software SMI value. PP: 0x%x; MC: 0x%x.\n",

+      __FUNCTION__,

+      TcgNvs->PhysicalPresence.SoftwareSmi,

+      TcgNvs->MemoryClear.SoftwareSmi

+      ));

+  }

+

+  return (EFI_STATUS) CommBuffer->ReturnStatus;

+}

+

+/**

+  Patch version string of Physical Presence interface supported by platform. The initial string tag in TPM

+ACPI table is "$PV".

+

+  @param[in, out] Table          The TPM item in ACPI table.

+  @param[in]      PPVer          Version string of Physical Presence interface supported by platform.

+

+  @return                        The allocated address for the found region.

+

+**/

+EFI_STATUS

+UpdatePPVersion (

+  EFI_ACPI_DESCRIPTION_HEADER    *Table,

+  CHAR8                          *PPVer

+  )

+{

+  EFI_STATUS  Status;

+  UINT8       *DataPtr;

+

+  //

+  // Patch some pointers for the ASL code before loading the SSDT.

+  //

+  for (DataPtr  = (UINT8 *)(Table + 1);

+       DataPtr <= (UINT8 *) ((UINT8 *) Table + Table->Length - PHYSICAL_PRESENCE_VERSION_SIZE);

+       DataPtr += 1) {

+    if (AsciiStrCmp((CHAR8 *)DataPtr,  PHYSICAL_PRESENCE_VERSION_TAG) == 0) {

+      Status = AsciiStrCpyS((CHAR8 *)DataPtr, PHYSICAL_PRESENCE_VERSION_SIZE, PPVer);

+      DEBUG((DEBUG_INFO, "TPM2 Physical Presence Interface Version update status 0x%x\n", Status));

+      return Status;

+    }

+  }

+

+  return EFI_NOT_FOUND;

+}

+

+/**

+  Patch interrupt resources returned by TPM _PRS. ResourceTemplate to patch is determined by input

+  interrupt buffer size. BufferSize, PkgLength and interrupt descriptor in ByteList need to be patched

+

+  @param[in, out] Table            The TPM item in ACPI table.

+  @param[in]      IrqBuffer        Input new IRQ buffer.

+  @param[in]      IrqBuffserSize   Input new IRQ buffer size.

+  @param[out]     IsShortFormPkgLength   If _PRS returns Short length Package(ACPI spec 20.2.4).

+

+  @return                          patch status.

+

+**/

+EFI_STATUS

+UpdatePossibleResource (

+  IN OUT  EFI_ACPI_DESCRIPTION_HEADER    *Table,

+  IN      UINT32                         *IrqBuffer,

+  IN      UINT32                         IrqBuffserSize,

+  OUT     BOOLEAN                        *IsShortFormPkgLength

+  )

+{

+  UINT8       *DataPtr;

+  UINT8       *DataEndPtr;

+  UINT32      NewPkgLength;

+  UINT32      OrignalPkgLength;

+

+  NewPkgLength     = 0;

+  OrignalPkgLength = 0;

+  DataEndPtr       = NULL;

+

+  //

+  // Follow ACPI spec

+  //           6.4.3   Extend Interrupt Descriptor.

+  //           19.3.3 ASL Resource Template

+  //           20      AML specification

+  // to patch TPM ACPI object _PRS returned ResourceTemplate() containing 2 resource descriptors and an auto appended End Tag

+  //

+  //  AML data is organized by following rule.

+  //  Code need to patch BufferSize and PkgLength and interrupt descriptor in ByteList

+  //

+  // =============  Buffer ====================

+  //           DefBuffer := BufferOp PkgLength BufferSize ByteList

+  //            BufferOp := 0x11

+  //

+  // ==============PkgLength==================

+  //          PkgLength := PkgLeadByte |

+  //                              <PkgLeadByte ByteData> |

+  //                              <PkgLeadByte ByteData ByteData> |

+  //                              <PkgLeadByte ByteData ByteData ByteData>

+  //

+  //       PkgLeadByte := <bit 7-6: ByteData count that follows (0-3)>

+  //                               <bit 5-4: Only used if PkgLength <= 63 >

+  //                               <bit 3-0: Least significant package length nybble>

+  //

+  //==============BufferSize==================

+  //        BufferSize := Integer

+  //           Integer := ByteConst|WordConst|DwordConst....

+  //

+  //           ByteConst := BytePrefix ByteData

+  //

+  //==============ByteList===================

+  //          ByteList := ByteData ByteList

+  //

+  //=========================================

+

+  //

+  // 1. Check TPM_PRS_RESS with PkgLength <=63 can hold the input interrupt number buffer for patching

+  //

+  for (DataPtr  = (UINT8 *)(Table + 1);

+       DataPtr < (UINT8 *) ((UINT8 *) Table + Table->Length - (TPM_PRS_RES_NAME_SIZE + TPM_POS_RES_TEMPLATE_MIN_SIZE));

+       DataPtr += 1) {

+    if (CompareMem(DataPtr, TPM_PRS_RESS, TPM_PRS_RES_NAME_SIZE) == 0) {

+      //

+      // Jump over object name & BufferOp

+      //

+      DataPtr += TPM_PRS_RES_NAME_SIZE + 1;

+

+      if ((*DataPtr & (BIT7|BIT6)) == 0) {

+        OrignalPkgLength = (UINT32)*DataPtr;

+        DataEndPtr       = DataPtr + OrignalPkgLength;

+

+        //

+        // Jump over PkgLength = PkgLeadByte only

+        //

+        NewPkgLength++;

+

+        //

+        // Jump over BufferSize

+        //

+        if (*(DataPtr + 1) == AML_BYTE_PREFIX) {

+          NewPkgLength += 2;

+        } else if (*(DataPtr + 1) == AML_WORD_PREFIX) {

+          NewPkgLength += 3;

+        } else if (*(DataPtr + 1) == AML_DWORD_PREFIX) {

+          NewPkgLength += 5;

+        } else {

+          ASSERT(FALSE);

+          return EFI_UNSUPPORTED;

+        }

+      } else {

+        ASSERT(FALSE);

+        return EFI_UNSUPPORTED;

+      }

+

+      //

+      // Include Memory32Fixed Descriptor (12 Bytes) + Interrupt Descriptor header(5 Bytes) + End Tag(2 Bytes)

+      //

+      NewPkgLength += 19 + IrqBuffserSize;

+      if (NewPkgLength > 63) {

+        break;

+      }

+

+      if (NewPkgLength > OrignalPkgLength) {

+        ASSERT(FALSE);

+        return EFI_INVALID_PARAMETER;

+      }

+

+      //

+      // 1.1 Patch PkgLength

+      //

+      *DataPtr = (UINT8)NewPkgLength;

+

+      //

+      // 1.2 Patch BufferSize = sizeof(Memory32Fixed Descriptor + Interrupt Descriptor + End Tag).

+      //      It is Little endian. So only patch lowest byte of BufferSize due to current interrupt number limit.

+      //

+      *(DataPtr + 2) = (UINT8)(IrqBuffserSize + 19);

+

+      //

+      // Notify _PRS to report short formed ResourceTemplate

+      //

+      *IsShortFormPkgLength = TRUE;

+

+      break;

+    }

+  }

+

+  //

+  // 2. Use TPM_PRS_RESL with PkgLength > 63 to hold longer input interrupt number buffer for patching

+  //

+  if (NewPkgLength > 63) {

+    NewPkgLength     = 0;

+    OrignalPkgLength = 0;

+    for (DataPtr  = (UINT8 *)(Table + 1);

+         DataPtr < (UINT8 *) ((UINT8 *) Table + Table->Length - (TPM_PRS_RES_NAME_SIZE + TPM_POS_RES_TEMPLATE_MIN_SIZE));

+         DataPtr += 1) {

+      if (CompareMem(DataPtr, TPM_PRS_RESL, TPM_PRS_RES_NAME_SIZE) == 0) {

+        //

+        // Jump over object name & BufferOp

+        //

+        DataPtr += TPM_PRS_RES_NAME_SIZE + 1;

+

+        if ((*DataPtr & (BIT7|BIT6)) != 0) {

+          OrignalPkgLength = (UINT32)(*(DataPtr + 1) << 4) + (*DataPtr & 0x0F);

+          DataEndPtr       = DataPtr + OrignalPkgLength;

+          //

+          // Jump over PkgLength = PkgLeadByte + ByteData length

+          //

+          NewPkgLength += 1 + ((*DataPtr & (BIT7|BIT6)) >> 6);

+

+          //

+          // Jump over BufferSize

+          //

+          if (*(DataPtr + NewPkgLength) == AML_BYTE_PREFIX) {

+            NewPkgLength += 2;

+          } else if (*(DataPtr + NewPkgLength) == AML_WORD_PREFIX) {

+            NewPkgLength += 3;

+          } else if (*(DataPtr + NewPkgLength) == AML_DWORD_PREFIX) {

+            NewPkgLength += 5;

+          } else {

+            ASSERT(FALSE);

+            return EFI_UNSUPPORTED;

+          }

+        } else {

+          ASSERT(FALSE);

+          return EFI_UNSUPPORTED;

+        }

+

+        //

+        // Include Memory32Fixed Descriptor (12 Bytes) + Interrupt Descriptor header(5 Bytes) + End Tag(2  Bytes)

+        //

+        NewPkgLength += 19 + IrqBuffserSize;

+

+        if (NewPkgLength > OrignalPkgLength) {

+          ASSERT(FALSE);

+          return EFI_INVALID_PARAMETER;

+        }

+

+        //

+        // 2.1 Patch PkgLength. Only patch PkgLeadByte and first ByteData

+        //

+        *DataPtr = (UINT8)((*DataPtr) & 0xF0) | (NewPkgLength & 0x0F);

+        *(DataPtr + 1) = (UINT8)((NewPkgLength & 0xFF0) >> 4);

+

+        //

+        // 2.2 Patch BufferSize = sizeof(Memory32Fixed Descriptor + Interrupt Descriptor + End Tag).

+        //     It is Little endian. Only patch lowest byte of BufferSize due to current interrupt number limit.

+        //

+        *(DataPtr + 2 + ((*DataPtr & (BIT7|BIT6)) >> 6)) = (UINT8)(IrqBuffserSize + 19);

+

+        //

+        // Notify _PRS to report long formed ResourceTemplate

+        //

+        *IsShortFormPkgLength = FALSE;

+        break;

+      }

+    }

+  }

+

+  if (DataPtr >= (UINT8 *) ((UINT8 *) Table + Table->Length - (TPM_PRS_RES_NAME_SIZE + TPM_POS_RES_TEMPLATE_MIN_SIZE))) {

+    return EFI_NOT_FOUND;

+  }

+

+  //

+  // 3. Move DataPtr to Interrupt descriptor header and patch interrupt descriptor.

+  //     5 bytes for interrupt descriptor header, 2 bytes for End Tag

+  //

+  DataPtr += NewPkgLength - (5 + IrqBuffserSize + 2);

+  //

+  //   3.1 Patch Length bit[7:0] of Interrupt descriptor patch interrupt descriptor

+  //

+  *(DataPtr + 1) = (UINT8)(2 + IrqBuffserSize);

+  //

+  //   3.2 Patch Interrupt Table Length

+  //

+  *(DataPtr + 4) = (UINT8)(IrqBuffserSize / sizeof(UINT32));

+  //

+  //   3.3 Copy patched InterruptNumBuffer

+  //

+  CopyMem(DataPtr + 5, IrqBuffer, IrqBuffserSize);

+

+  //

+  // 4. Jump over Interrupt descriptor and Patch END Tag, set Checksum field to 0

+  //

+  DataPtr       += 5 + IrqBuffserSize;

+  *DataPtr       = ACPI_END_TAG_DESCRIPTOR;

+  *(DataPtr + 1) = 0;

+

+  //

+  // 5. Jump over new ResourceTemplate. Stuff rest bytes to NOOP

+  //

+  DataPtr += 2;

+  if (DataPtr < DataEndPtr) {

+    SetMem(DataPtr, (UINTN)DataEndPtr - (UINTN)DataPtr, AML_NOOP_OP);

+  }

+

+  return EFI_SUCCESS;

+}

+

+/**

+  Patch TPM2 device HID string.  The initial string tag in TPM2 ACPI table is "NNN0000".

+

+  @param[in, out] Table          The TPM2 SSDT ACPI table.

+

+  @return                               HID Update status.

+

+**/

+EFI_STATUS

+UpdateHID (

+  EFI_ACPI_DESCRIPTION_HEADER    *Table

+  )

+{

+  EFI_STATUS  Status;

+  UINT8       *DataPtr;

+  CHAR8       Hid[TPM_HID_ACPI_SIZE];

+  UINT32      ManufacturerID;

+  UINT32      FirmwareVersion1;

+  UINT32      FirmwareVersion2;

+  BOOLEAN     PnpHID;

+

+  PnpHID = TRUE;

+

+  //

+  // Initialize HID with Default PNP string

+  //

+  ZeroMem(Hid, TPM_HID_ACPI_SIZE);

+

+  //

+  // Get Manufacturer ID

+  //

+  Status = Tpm2GetCapabilityManufactureID(&ManufacturerID);

+  if (!EFI_ERROR(Status)) {

+    DEBUG((DEBUG_INFO, "TPM_PT_MANUFACTURER 0x%08x\n", ManufacturerID));

+    //

+    // ManufacturerID defined in TCG Vendor ID Registry

+    // may tailed with 0x00 or 0x20

+    //

+    if ((ManufacturerID >> 24) == 0x00 || ((ManufacturerID >> 24) == 0x20)) {

+      //

+      //  HID containing PNP ID "NNN####"

+      //   NNN is uppercase letter for Vendor ID specified by manufacturer

+      //

+      CopyMem(Hid, &ManufacturerID, 3);

+    } else {

+      //

+      //  HID containing ACP ID "NNNN####"

+      //   NNNN is uppercase letter for Vendor ID specified by manufacturer

+      //

+      CopyMem(Hid, &ManufacturerID, 4);

+      PnpHID = FALSE;

+    }

+  } else {

+    DEBUG ((DEBUG_ERROR, "Get TPM_PT_MANUFACTURER failed %x!\n", Status));

+    ASSERT(FALSE);

+    return Status;

+  }

+

+  Status = Tpm2GetCapabilityFirmwareVersion(&FirmwareVersion1, &FirmwareVersion2);

+  if (!EFI_ERROR(Status)) {

+    DEBUG((DEBUG_INFO, "TPM_PT_FIRMWARE_VERSION_1 0x%x\n", FirmwareVersion1));

+    DEBUG((DEBUG_INFO, "TPM_PT_FIRMWARE_VERSION_2 0x%x\n", FirmwareVersion2));

+    //

+    //   #### is Firmware Version 1

+    //

+    if (PnpHID) {

+      AsciiSPrint(Hid + 3, TPM_HID_PNP_SIZE - 3, "%02d%02d", ((FirmwareVersion1 & 0xFFFF0000) >> 16), (FirmwareVersion1 & 0x0000FFFF));

+    } else {

+      AsciiSPrint(Hid + 4, TPM_HID_ACPI_SIZE - 4, "%02d%02d", ((FirmwareVersion1 & 0xFFFF0000) >> 16), (FirmwareVersion1 & 0x0000FFFF));

+    }

+

+  } else {

+    DEBUG ((DEBUG_ERROR, "Get TPM_PT_FIRMWARE_VERSION_X failed %x!\n", Status));

+    ASSERT(FALSE);

+    return Status;

+  }

+

+  //

+  // Patch HID in ASL code before loading the SSDT.

+  //

+  for (DataPtr  = (UINT8 *)(Table + 1);

+       DataPtr <= (UINT8 *) ((UINT8 *) Table + Table->Length - TPM_HID_PNP_SIZE);

+       DataPtr += 1) {

+    if (AsciiStrCmp((CHAR8 *)DataPtr,  TPM_HID_TAG) == 0) {

+      if (PnpHID) {

+        CopyMem(DataPtr, Hid, TPM_HID_PNP_SIZE);

+        //

+        // if HID is PNP ID, patch the last byte in HID TAG to Noop

+        //

+        *(DataPtr + TPM_HID_PNP_SIZE) = AML_NOOP_OP;

+      } else {

+

+        CopyMem(DataPtr, Hid, TPM_HID_ACPI_SIZE);

+      }

+      DEBUG((DEBUG_INFO, "TPM2 ACPI _HID is patched to %a\n", DataPtr));

+

+      return Status;

+    }

+  }

+

+  DEBUG((DEBUG_ERROR, "TPM2 ACPI HID TAG for patch not found!\n"));

+  return EFI_NOT_FOUND;

+}

+

+/**

+  Initialize and publish TPM items in ACPI table.

+

+  @retval   EFI_SUCCESS     The TCG ACPI table is published successfully.

+  @retval   Others          The TCG ACPI table is not published.

+

+**/

+EFI_STATUS

+PublishAcpiTable (

+  VOID

+  )

+{

+  EFI_STATUS                     Status;

+  EFI_ACPI_TABLE_PROTOCOL        *AcpiTable;

+  UINTN                          TableKey;

+  EFI_ACPI_DESCRIPTION_HEADER    *Table;

+  UINTN                          TableSize;

+  UINT32                         *PossibleIrqNumBuf;

+  UINT32                         PossibleIrqNumBufSize;

+  BOOLEAN                        IsShortFormPkgLength;

+

+  IsShortFormPkgLength = FALSE;

+

+  Status = GetSectionFromFv (

+             &gEfiCallerIdGuid,

+             EFI_SECTION_RAW,

+             0,

+             (VOID **) &Table,

+             &TableSize

+             );

+  ASSERT_EFI_ERROR (Status);

+

+  //

+  // Measure to PCR[0] with event EV_POST_CODE ACPI DATA.

+  // The measurement has to be done before any update.

+  // Otherwise, the PCR record would be different after TPM FW update

+  // or the PCD configuration change.

+  //

+  TpmMeasureAndLogData(

+    0,

+    EV_POST_CODE,

+    EV_POSTCODE_INFO_ACPI_DATA,

+    ACPI_DATA_LEN,

+    Table,

+    TableSize

+    );

+

+  //

+  // Update Table version before measuring it to PCR

+  //

+  Status = UpdatePPVersion(Table, (CHAR8 *)PcdGetPtr(PcdTcgPhysicalPresenceInterfaceVer));

+  ASSERT_EFI_ERROR (Status);

+

+  DEBUG ((

+    DEBUG_INFO,

+    "Current physical presence interface version - %a\n",

+    (CHAR8 *) PcdGetPtr(PcdTcgPhysicalPresenceInterfaceVer)

+    ));

+

+  //

+  // Update TPM2 HID after measuring it to PCR

+  //

+  Status = UpdateHID(Table);

+  if (EFI_ERROR(Status)) {

+    return Status;

+  }

+

+  if (PcdGet32(PcdTpm2CurrentIrqNum) != 0) {

+    //

+    // Patch _PRS interrupt resource only when TPM interrupt is supported

+    //

+    PossibleIrqNumBuf     = (UINT32 *)PcdGetPtr(PcdTpm2PossibleIrqNumBuf);

+    PossibleIrqNumBufSize = (UINT32)PcdGetSize(PcdTpm2PossibleIrqNumBuf);

+

+    if (PossibleIrqNumBufSize <= MAX_PRS_INT_BUF_SIZE && (PossibleIrqNumBufSize % sizeof(UINT32)) == 0) {

+      Status = UpdatePossibleResource(Table, PossibleIrqNumBuf, PossibleIrqNumBufSize, &IsShortFormPkgLength);

+      DEBUG ((

+        DEBUG_INFO,

+        "UpdatePossibleResource status - %x. TPM2 service may not ready in OS.\n",

+        Status

+        ));

+    } else {

+      DEBUG ((

+        DEBUG_INFO,

+        "PcdTpm2PossibleIrqNumBuf size %x is not correct. TPM2 service may not ready in OS.\n",

+        PossibleIrqNumBufSize

+      ));

+    }

+  }

+

+  ASSERT (Table->OemTableId == SIGNATURE_64 ('T', 'p', 'm', '2', 'T', 'a', 'b', 'l'));

+  CopyMem (Table->OemId, PcdGetPtr (PcdAcpiDefaultOemId), sizeof (Table->OemId) );

+  mTcgNvs = AssignOpRegion (Table, SIGNATURE_32 ('T', 'N', 'V', 'S'), (UINT16) sizeof (TCG_NVS));

+  ASSERT (mTcgNvs != NULL);

+  mTcgNvs->TpmIrqNum            = PcdGet32(PcdTpm2CurrentIrqNum);

+  mTcgNvs->IsShortFormPkgLength = IsShortFormPkgLength;

+

+  Status = ExchangeCommonBuffer (mTcgNvs);

+

+  //

+  // Publish the TPM ACPI table. Table is re-checksummed.

+  //

+  Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **) &AcpiTable);

+  ASSERT_EFI_ERROR (Status);

+

+  TableKey = 0;

+  Status = AcpiTable->InstallAcpiTable (

+                        AcpiTable,

+                        Table,

+                        TableSize,

+                        &TableKey

+                        );

+  ASSERT_EFI_ERROR (Status);

+

+  return Status;

+}

+

+/**

+  Publish TPM2 ACPI table

+

+  @retval   EFI_SUCCESS     The TPM2 ACPI table is published successfully.

+  @retval   Others          The TPM2 ACPI table is not published.

+

+**/

+EFI_STATUS

+PublishTpm2 (

+  VOID

+  )

+{

+  EFI_STATUS                     Status;

+  EFI_ACPI_TABLE_PROTOCOL        *AcpiTable;

+  UINTN                          TableKey;

+  UINT64                         OemTableId;

+  EFI_TPM2_ACPI_CONTROL_AREA     *ControlArea;

+  TPM2_PTP_INTERFACE_TYPE        InterfaceType;

+

+  //

+  // Measure to PCR[0] with event EV_POST_CODE ACPI DATA.

+  // The measurement has to be done before any update.

+  // Otherwise, the PCR record would be different after event log update

+  // or the PCD configuration change.

+  //

+  TpmMeasureAndLogData(

+    0,

+    EV_POST_CODE,

+    EV_POSTCODE_INFO_ACPI_DATA,

+    ACPI_DATA_LEN,

+    &mTpm2AcpiTemplate,

+    mTpm2AcpiTemplate.Header.Length

+    );

+

+  mTpm2AcpiTemplate.Header.Revision = PcdGet8(PcdTpm2AcpiTableRev);

+  DEBUG((DEBUG_INFO, "Tpm2 ACPI table revision is %d\n", mTpm2AcpiTemplate.Header.Revision));

+

+  //

+  // PlatformClass is only valid for version 4 and above

+  //    BIT0~15:  PlatformClass

+  //    BIT16~31: Reserved

+  //

+  if (mTpm2AcpiTemplate.Header.Revision >= EFI_TPM2_ACPI_TABLE_REVISION_4) {

+    mTpm2AcpiTemplate.Flags = (mTpm2AcpiTemplate.Flags & 0xFFFF0000) | PcdGet8(PcdTpmPlatformClass);

+    DEBUG((DEBUG_INFO, "Tpm2 ACPI table PlatformClass is %d\n", (mTpm2AcpiTemplate.Flags & 0x0000FFFF)));

+  }

+

+  mTpm2AcpiTemplate.Laml = PcdGet32(PcdTpm2AcpiTableLaml);

+  mTpm2AcpiTemplate.Lasa = PcdGet64(PcdTpm2AcpiTableLasa);

+  if ((mTpm2AcpiTemplate.Header.Revision < EFI_TPM2_ACPI_TABLE_REVISION_4) ||

+      (mTpm2AcpiTemplate.Laml == 0) || (mTpm2AcpiTemplate.Lasa == 0)) {

+    //

+    // If version is smaller than 4 or Laml/Lasa is not valid, rollback to original Length.

+    //

+    mTpm2AcpiTemplate.Header.Length = sizeof(EFI_TPM2_ACPI_TABLE);

+  }

+

+  InterfaceType = PcdGet8(PcdActiveTpmInterfaceType);

+  switch (InterfaceType) {

+  case Tpm2PtpInterfaceCrb:

+    mTpm2AcpiTemplate.StartMethod = EFI_TPM2_ACPI_TABLE_START_METHOD_COMMAND_RESPONSE_BUFFER_INTERFACE;

+    mTpm2AcpiTemplate.AddressOfControlArea = PcdGet64 (PcdTpmBaseAddress) + 0x40;

+    ControlArea = (EFI_TPM2_ACPI_CONTROL_AREA *)(UINTN)mTpm2AcpiTemplate.AddressOfControlArea;

+    ControlArea->CommandSize  = 0xF80;

+    ControlArea->ResponseSize = 0xF80;

+    ControlArea->Command      = PcdGet64 (PcdTpmBaseAddress) + 0x80;

+    ControlArea->Response     = PcdGet64 (PcdTpmBaseAddress) + 0x80;

+    break;

+  case Tpm2PtpInterfaceFifo:

+  case Tpm2PtpInterfaceTis:

+    break;

+  default:

+    DEBUG((DEBUG_ERROR, "TPM2 InterfaceType get error! %d\n", InterfaceType));

+    break;

+  }

+

+  CopyMem (mTpm2AcpiTemplate.Header.OemId, PcdGetPtr (PcdAcpiDefaultOemId), sizeof (mTpm2AcpiTemplate.Header.OemId));

+  OemTableId = PcdGet64 (PcdAcpiDefaultOemTableId);

+  CopyMem (&mTpm2AcpiTemplate.Header.OemTableId, &OemTableId, sizeof (UINT64));

+  mTpm2AcpiTemplate.Header.OemRevision      = PcdGet32 (PcdAcpiDefaultOemRevision);

+  mTpm2AcpiTemplate.Header.CreatorId        = PcdGet32 (PcdAcpiDefaultCreatorId);

+  mTpm2AcpiTemplate.Header.CreatorRevision  = PcdGet32 (PcdAcpiDefaultCreatorRevision);

+

+  //

+  // Construct ACPI table

+  //

+  Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **) &AcpiTable);

+  ASSERT_EFI_ERROR (Status);

+

+  Status = AcpiTable->InstallAcpiTable (

+                        AcpiTable,

+                        &mTpm2AcpiTemplate,

+                        mTpm2AcpiTemplate.Header.Length,

+                        &TableKey

+                        );

+  ASSERT_EFI_ERROR (Status);

+

+  return Status;

+}

+

+/**

+  The driver's entry point.

+

+  It patches and installs ACPI tables used for handling TPM physical presence

+  and Memory Clear requests through ACPI method.

+

+  @param[in] ImageHandle  The firmware allocated handle for the EFI image.

+  @param[in] SystemTable  A pointer to the EFI System Table.

+

+  @retval EFI_SUCCESS     The entry point is executed successfully.

+  @retval Others          Some error occurs when executing this entry point.

+

+**/

+EFI_STATUS

+EFIAPI

+InitializeTcgAcpi (

+  IN EFI_HANDLE                  ImageHandle,

+  IN EFI_SYSTEM_TABLE            *SystemTable

+  )

+{

+  EFI_STATUS                     Status;

+

+  if (!CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceTpm20DtpmGuid)){

+    DEBUG ((DEBUG_ERROR, "No TPM2 DTPM instance required!\n"));

+    return EFI_UNSUPPORTED;

+  }

+

+  Status = PublishAcpiTable ();

+  ASSERT_EFI_ERROR (Status);

+

+  //

+  // Set TPM2 ACPI table

+  //

+  Status = PublishTpm2 ();

+  ASSERT_EFI_ERROR (Status);

+

+  return EFI_SUCCESS;

+}

+

diff --git a/SecurityPkg/Tcg/Tcg2Acpi/Tcg2Acpi.inf b/SecurityPkg/Tcg/Tcg2Acpi/Tcg2Acpi.inf
new file mode 100644
index 0000000..42ddb4b
--- /dev/null
+++ b/SecurityPkg/Tcg/Tcg2Acpi/Tcg2Acpi.inf
@@ -0,0 +1,93 @@
+## @file

+#  Provides ACPI methods for TPM 2.0 support

+#

+#  Spec Compliance Info:

+#     "TCG ACPI Specification Version 1.2 Revision 8"

+#     "Physical Presence Interface Specification Version 1.30 Revision 00.52"

+#       along with

+#     "Errata Version 0.4 for TCG PC Client Platform Physical Presence Interface Specification"

+#     "Platform Reset Attack Mitigation Specification Version 1.00"

+#    TPM2.0 ACPI device object

+#     "TCG PC Client Platform Firmware Profile Specification for TPM Family 2.0 Level 00 Revision 1.03 v51"

+#       along with

+#     "Errata for PC Client Specific Platform Firmware Profile Specification Version 1.0 Revision 1.03"

+#

+#  This driver implements TPM 2.0 definition block in ACPI table and

+#  populates registered SMI callback functions for Tcg2 physical presence

+#  and MemoryClear to handle the requests for ACPI method. It needs to be

+#  used together with Tcg2 MM drivers to exchange information on registered

+#  SwSmiValue and allocated NVS region address.

+#

+#  Caution: This module requires additional review when modified.

+#  This driver will have external input - variable and ACPINvs data in SMM mode.

+#  This external input must be validated carefully to avoid security issue.

+#

+# Copyright (c) 2015 - 2019, Intel Corporation. All rights reserved.<BR>

+# Copyright (c) Microsoft Corporation.<BR>

+# SPDX-License-Identifier: BSD-2-Clause-Patent

+#

+##

+

+[Defines]

+  INF_VERSION                    = 0x00010005

+  BASE_NAME                      = Tcg2Acpi

+  FILE_GUID                      = 0D4BBF18-C2CC-4C23-BD63-BFDAD4C710D0

+  MODULE_TYPE                    = DXE_DRIVER

+  PI_SPECIFICATION_VERSION       = 0x0001000A

+  VERSION_STRING                 = 1.0

+  ENTRY_POINT                    = InitializeTcgAcpi

+

+[Sources]

+  Tcg2Acpi.c

+  Tpm.asl

+

+[Packages]

+  MdePkg/MdePkg.dec

+  MdeModulePkg/MdeModulePkg.dec

+  SecurityPkg/SecurityPkg.dec

+

+[LibraryClasses]

+  BaseLib

+  BaseMemoryLib

+  UefiDriverEntryPoint

+  UefiBootServicesTableLib

+  DebugLib

+  DxeServicesLib

+  TpmMeasurementLib

+  Tpm2CommandLib

+  Tcg2PhysicalPresenceLib

+  PcdLib

+

+[Guids]

+  gEfiTpmDeviceInstanceTpm20DtpmGuid                            ## PRODUCES           ## GUID       # TPM device identifier

+  gTpmNvsMmGuid                                                 ## CONSUMES

+  gEdkiiPiSmmCommunicationRegionTableGuid                       ## CONSUMES

+

+[Protocols]

+  gEfiAcpiTableProtocolGuid                                     ## CONSUMES

+  gEfiMmCommunicationProtocolGuid                               ## CONSUMES

+

+[FixedPcd]

+  gEfiSecurityPkgTokenSpaceGuid.PcdSmiCommandIoPort             ## CONSUMES

+

+[Pcd]

+  gEfiSecurityPkgTokenSpaceGuid.PcdTpmInstanceGuid              ## CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultOemId            ## SOMETIMES_CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultOemTableId       ## SOMETIMES_CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultOemRevision      ## SOMETIMES_CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorId        ## SOMETIMES_CONSUMES

+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorRevision  ## SOMETIMES_CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdTpmBaseAddress               ## CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdTcgPhysicalPresenceInterfaceVer  ## CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdTpm2AcpiTableRev                 ## CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdTpmPlatformClass                 ## SOMETIMES_CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdTpm2CurrentIrqNum            ## CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdTpm2PossibleIrqNumBuf        ## CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdActiveTpmInterfaceType       ## CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdTpm2AcpiTableLaml            ## CONSUMES

+  gEfiSecurityPkgTokenSpaceGuid.PcdTpm2AcpiTableLasa            ## CONSUMES

+

+[Depex]

+  gEfiAcpiTableProtocolGuid AND

+  gTcg2MmSwSmiRegisteredGuid AND

+  gEfiTcg2ProtocolGuid

diff --git a/SecurityPkg/Tcg/Tcg2Acpi/Tpm.asl b/SecurityPkg/Tcg/Tcg2Acpi/Tpm.asl
new file mode 100644
index 0000000..95f9d7e
--- /dev/null
+++ b/SecurityPkg/Tcg/Tcg2Acpi/Tpm.asl
@@ -0,0 +1,517 @@
+/** @file

+  The TPM2 definition block in ACPI table for TCG2 physical presence

+  and MemoryClear.

+

+Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>

+(c)Copyright 2016 HP Development Company, L.P.<BR>

+Copyright (c) Microsoft Corporation.<BR>

+SPDX-License-Identifier: BSD-2-Clause-Patent

+

+**/

+

+DefinitionBlock (

+  "Tpm.aml",

+  "SSDT",

+  2,

+  "INTEL ",

+  "Tpm2Tabl",

+  0x1000

+  )

+{

+  Scope (\_SB)

+  {

+    Device (TPM)

+    {

+      //

+      // TCG2

+      //

+

+      //

+      //  TAG for patching TPM2.0 _HID

+      //

+      Name (_HID, "NNNN0000")

+

+      Name (_CID, "MSFT0101")

+

+      //

+      // Readable name of this device, don't know if this way is correct yet

+      //

+      Name (_STR, Unicode ("TPM 2.0 Device"))

+

+      //

+      // Operational region for Smi port access

+      //

+      OperationRegion (SMIP, SystemIO, FixedPcdGet16 (PcdSmiCommandIoPort), 1)

+      Field (SMIP, ByteAcc, NoLock, Preserve)

+      {

+          IOPN, 8

+      }

+

+      //

+      // Operational region for TPM access

+      //

+      OperationRegion (TPMR, SystemMemory, 0xfed40000, 0x5000)

+      Field (TPMR, AnyAcc, NoLock, Preserve)

+      {

+        ACC0, 8,  // TPM_ACCESS_0

+        Offset(0x8),

+        INTE, 32, // TPM_INT_ENABLE_0

+        INTV, 8,  // TPM_INT_VECTOR_0

+        Offset(0x10),

+        INTS, 32, // TPM_INT_STATUS_0

+        INTF, 32, // TPM_INTF_CAPABILITY_0

+        STS0, 32, // TPM_STS_0

+        Offset(0x24),

+        FIFO, 32, // TPM_DATA_FIFO_0

+        Offset(0x30),

+        TID0, 32, // TPM_INTERFACE_ID_0

+                  // ignore the rest

+      }

+

+      //

+      // Operational region for TPM support, TPM Physical Presence and TPM Memory Clear

+      // Region Offset 0xFFFF0000 and Length 0xF0 will be fixed in C code.

+      //

+      OperationRegion (TNVS, SystemMemory, 0xFFFF0000, 0xF0)

+      Field (TNVS, AnyAcc, NoLock, Preserve)

+      {

+        PPIN,   8,  //   Software SMI for Physical Presence Interface

+        PPIP,   32, //   Used for save physical presence parameter

+        PPRP,   32, //   Physical Presence request operation response

+        PPRQ,   32, //   Physical Presence request operation

+        PPRM,   32, //   Physical Presence request operation parameter

+        LPPR,   32, //   Last Physical Presence request operation

+        FRET,   32, //   Physical Presence function return code

+        MCIN,   8,  //   Software SMI for Memory Clear Interface

+        MCIP,   32, //   Used for save the Mor parameter

+        MORD,   32, //   Memory Overwrite Request Data

+        MRET,   32, //   Memory Overwrite function return code

+        UCRQ,   32, //   Physical Presence request operation to Get User Confirmation Status

+        IRQN,   32, //   IRQ Number for _CRS

+        SFRB,   8   //   Is shortformed Pkglength for resource buffer

+      }

+

+      //

+      // Possible resource settings returned by  _PRS method

+      //   RESS : ResourceTemplate with PkgLength <=63

+      //   RESL : ResourceTemplate with PkgLength > 63

+      //

+      // The format of the data has to follow the same format as

+      // _CRS (according to ACPI spec).

+      //

+      Name (RESS, ResourceTemplate() {

+        Memory32Fixed (ReadWrite, 0xfed40000, 0x5000)

+        Interrupt(ResourceConsumer, Level, ActiveLow, Shared, , , ) {1,2,3,4,5,6,7,8,9,10}

+      })

+

+      Name (RESL, ResourceTemplate() {

+        Memory32Fixed (ReadWrite, 0xfed40000, 0x5000)

+        Interrupt(ResourceConsumer, Level, ActiveLow, Shared, , , ) {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}

+      })

+

+      //

+      // Current resource settings for _CRS method

+      //

+      Name(RES0, ResourceTemplate () {

+        Memory32Fixed (ReadWrite, 0xfed40000, 0x5000, REG0)

+        Interrupt(ResourceConsumer, Level, ActiveLow, Shared, , , INTR) {12}

+      })

+

+      Name(RES1, ResourceTemplate () {

+        Memory32Fixed (ReadWrite, 0xfed40000, 0x5000, REG1)

+      })

+

+

+      //

+      // Return the resource consumed by TPM device.

+      //

+      Method(_CRS,0,Serialized)

+      {

+        //

+        // IRQNum = 0 means disable IRQ support

+        //

+        If (LEqual(IRQN, 0)) {

+          Return (RES1)

+        }

+        Else

+        {

+          CreateDWordField(RES0, ^INTR._INT, LIRQ)

+          Store(IRQN, LIRQ)

+          Return (RES0)

+        }

+      }

+

+      //

+      // Set resources consumed by the TPM device. This is used to

+      // assign an interrupt number to the device. The input byte stream

+      // has to be the same as returned by _CRS (according to ACPI spec).

+      //

+      // Platform may choose to override this function with specific interrupt

+      // programing logic to replace FIFO/TIS SIRQ registers programing

+      //

+      Method(_SRS,1,Serialized)

+      {

+        //

+        // Do not configure Interrupt if IRQ Num is configured 0 by default

+        //

+        If (LNotEqual(IRQN, 0)) {

+          //

+          // Update resource descriptor

+          // Use the field name to identify the offsets in the argument

+          // buffer and RES0 buffer.

+          //

+          CreateDWordField(Arg0, ^INTR._INT, IRQ0)

+          CreateDWordField(RES0, ^INTR._INT, LIRQ)

+          Store(IRQ0, LIRQ)

+          Store(IRQ0, IRQN)

+

+          CreateBitField(Arg0, ^INTR._HE, ITRG)

+          CreateBitField(RES0, ^INTR._HE, LTRG)

+          Store(ITRG, LTRG)

+

+          CreateBitField(Arg0, ^INTR._LL, ILVL)

+          CreateBitField(RES0, ^INTR._LL, LLVL)

+          Store(ILVL, LLVL)

+

+          //

+          // Update TPM FIFO PTP/TIS interface only, identified by TPM_INTERFACE_ID_x lowest

+          // nibble.

+          // 0000 - FIFO interface as defined in PTP for TPM 2.0 is active

+          // 1111 - FIFO interface as defined in TIS1.3 is active

+          //

+          If (LOr(LEqual (And (TID0, 0x0F), 0x00), LEqual (And (TID0, 0x0F), 0x0F))) {

+            //

+            // If FIFO interface, interrupt vector register is

+            // available. TCG PTP specification allows only

+            // values 1..15 in this field. For other interrupts

+            // the field should stay 0.

+            //

+            If (LLess (IRQ0, 16)) {

+              Store (And(IRQ0, 0xF), INTV)

+            }

+            //

+            // Interrupt enable register (TPM_INT_ENABLE_x) bits 3:4

+            // contains settings for interrupt polarity.

+            // The other bits of the byte enable individual interrupts.

+            // They should be all be zero, but to avoid changing the

+            // configuration, the other bits are be preserved.

+            // 00 - high level

+            // 01 - low level

+            // 10 - rising edge

+            // 11 - falling edge

+            //

+            // ACPI spec definitions:

+            // _HE: '1' is Edge, '0' is Level

+            // _LL: '1' is ActiveHigh, '0' is ActiveLow (inverted from TCG spec)

+            //

+            If (LEqual (ITRG, 1)) {

+              Or(INTE, 0x00000010, INTE)

+            } Else {

+              And(INTE, 0xFFFFFFEF, INTE)

+            }

+            if (LEqual (ILVL, 0)) {

+              Or(INTE, 0x00000008, INTE)

+            } Else {

+              And(INTE, 0xFFFFFFF7, INTE)

+            }

+          }

+        }

+      }

+

+      Method(_PRS,0,Serialized)

+      {

+        //

+        // IRQNum = 0 means disable IRQ support

+        //

+        If (LEqual(IRQN, 0)) {

+          Return (RES1)

+        } ElseIf(LEqual(SFRB, 0)) {

+          //

+          // Long format. Possible resources PkgLength > 63

+          //

+          Return (RESL)

+        } Else {

+          //

+          // Short format. Possible resources PkgLength <=63

+          //

+          Return (RESS)

+        }

+      }

+

+      Method (PTS, 1, Serialized)

+      {

+        //

+        // Detect Sx state for MOR, only S4, S5 need to handle

+        //

+        If (LAnd (LLess (Arg0, 6), LGreater (Arg0, 3)))

+        {

+          //

+          // Bit4 -- DisableAutoDetect. 0 -- Firmware MAY autodetect.

+          //

+          If (LNot (And (MORD, 0x10)))

+          {

+            //

+            // Trigger the SMI through ACPI _PTS method.

+            //

+            Store (0x02, MCIP)

+

+            //

+            // Trigger the SMI interrupt

+            //

+            Store (MCIN, IOPN)

+          }

+        }

+        Return (0)

+      }

+

+      Method (_STA, 0)

+      {

+        if (LEqual (ACC0, 0xff))

+        {

+            Return (0)

+        }

+        Return (0x0f)

+      }

+

+      //

+      // TCG Hardware Information

+      //

+      Method (HINF, 1, Serialized, 0, {BuffObj, PkgObj}, {UnknownObj}) // IntObj

+      {

+        //

+        // Switch by function index

+        //

+        Switch (ToInteger(Arg0))

+        {

+          Case (0)

+          {

+            //

+            // Standard query

+            //

+            Return (Buffer () {0x03})

+          }

+          Case (1)

+          {

+            //

+            // Return failure if no TPM present

+            //

+            Name(TPMV, Package () {0x01, Package () {0x2, 0x0}})

+            if (LEqual (_STA (), 0x00))

+            {

+              Return (Package () {0x00})

+            }

+

+            //

+            // Return TPM version

+            //

+            Return (TPMV)

+          }

+          Default {BreakPoint}

+        }

+        Return (Buffer () {0})

+      }

+

+      Name(TPM2, Package (0x02){

+        Zero,

+        Zero

+      })

+

+      Name(TPM3, Package (0x03){

+        Zero,

+        Zero,

+        Zero

+      })

+

+      //

+      // TCG Physical Presence Interface

+      //

+      Method (TPPI, 2, Serialized, 0, {BuffObj, PkgObj, IntObj, StrObj}, {UnknownObj, UnknownObj}) // IntObj, PkgObj

+      {

+        //

+        // Switch by function index

+        //

+        Switch (ToInteger(Arg0))

+        {

+          Case (0)

+          {

+            //

+            // Standard query, supports function 1-8

+            //

+            Return (Buffer () {0xFF, 0x01})

+          }

+          Case (1)

+          {

+            //

+            // a) Get Physical Presence Interface Version

+            //

+            Return ("$PV")

+          }

+          Case (2)

+          {

+            //

+            // b) Submit TPM Operation Request to Pre-OS Environment

+            //

+

+            Store (DerefOf (Index (Arg1, 0x00)), PPRQ)

+            Store (0, PPRM)

+            Store (0x02, PPIP)

+

+            //

+            // Trigger the SMI interrupt

+            //

+            Store (PPIN, IOPN)

+            Return (FRET)

+

+

+          }

+          Case (3)

+          {

+            //

+            // c) Get Pending TPM Operation Requested By the OS

+            //

+

+            Store (PPRQ, Index (TPM2, 0x01))

+            Return (TPM2)

+          }

+          Case (4)

+          {

+            //

+            // d) Get Platform-Specific Action to Transition to Pre-OS Environment

+            //

+            Return (2)

+          }

+          Case (5)

+          {

+            //

+            // e) Return TPM Operation Response to OS Environment

+            //

+            Store (0x05, PPIP)

+

+            //

+            // Trigger the SMI interrupt

+            //

+            Store (PPIN, IOPN)

+

+            Store (LPPR, Index (TPM3, 0x01))

+            Store (PPRP, Index (TPM3, 0x02))

+

+            Return (TPM3)

+          }

+          Case (6)

+          {

+

+            //

+            // f) Submit preferred user language (Not implemented)

+            //

+

+            Return (3)

+

+          }

+          Case (7)

+          {

+            //

+            // g) Submit TPM Operation Request to Pre-OS Environment 2

+            //

+            Store (7, PPIP)

+            Store (DerefOf (Index (Arg1, 0x00)), PPRQ)

+            Store (0, PPRM)

+            If (LEqual (PPRQ, 23)) {

+              Store (DerefOf (Index (Arg1, 0x01)), PPRM)

+            }

+

+            //

+            // Trigger the SMI interrupt

+            //

+            Store (PPIN, IOPN)

+            Return (FRET)

+          }

+          Case (8)

+          {

+            //

+            // e) Get User Confirmation Status for Operation

+            //

+            Store (8, PPIP)

+            Store (DerefOf (Index (Arg1, 0x00)), UCRQ)

+

+            //

+            // Trigger the SMI interrupt

+            //

+            Store (PPIN, IOPN)

+

+            Return (FRET)

+          }

+

+          Default {BreakPoint}

+        }

+        Return (1)

+      }

+

+      Method (TMCI, 2, Serialized, 0, IntObj, {UnknownObj, UnknownObj}) // IntObj, PkgObj

+      {

+        //

+        // Switch by function index

+        //

+        Switch (ToInteger (Arg0))

+        {

+          Case (0)

+          {

+            //

+            // Standard query, supports function 1-1

+            //

+            Return (Buffer () {0x03})

+          }

+          Case (1)

+          {

+            //

+            // Save the Operation Value of the Request to MORD (reserved memory)

+            //

+            Store (DerefOf (Index (Arg1, 0x00)), MORD)

+

+            //

+            // Trigger the SMI through ACPI _DSM method.

+            //

+            Store (0x01, MCIP)

+

+            //

+            // Trigger the SMI interrupt

+            //

+            Store (MCIN, IOPN)

+            Return (MRET)

+          }

+          Default {BreakPoint}

+        }

+        Return (1)

+      }

+

+      Method (_DSM, 4, Serialized, 0, UnknownObj, {BuffObj, IntObj, IntObj, PkgObj})

+      {

+

+        //

+        // TCG Hardware Information

+        //

+        If(LEqual(Arg0, ToUUID ("cf8e16a5-c1e8-4e25-b712-4f54a96702c8")))

+        {

+          Return (HINF (Arg2))

+        }

+

+        //

+        // TCG Physical Presence Interface

+        //

+        If(LEqual(Arg0, ToUUID ("3dddfaa6-361b-4eb4-a424-8d10089d1653")))

+        {

+          Return (TPPI (Arg2, Arg3))

+        }

+

+        //

+        // TCG Memory Clear Interface

+        //

+        If(LEqual(Arg0, ToUUID ("376054ed-cc13-4675-901c-4756d7f2d45d")))

+        {

+          Return (TMCI (Arg2, Arg3))

+        }

+

+        Return (Buffer () {0})

+      }

+    }

+  }

+}