132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/**@file
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@copyright
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INTEL CONFIDENTIAL
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Copyright 2012 - 2017 Intel Corporation.
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The source code contained or described herein and all documents related to the
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source code ("Material") are owned by Intel Corporation or its suppliers or
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licensors. Title to the Material remains with Intel Corporation or its suppliers
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and licensors. The Material may contain trade secrets and proprietary and
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confidential information of Intel Corporation and its suppliers and licensors,
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and is protected by worldwide copyright and trade secret laws and treaty
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provisions. No part of the Material may be used, copied, reproduced, modified,
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published, uploaded, posted, transmitted, distributed, or disclosed in any way
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without Intel's prior express written permission.
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No license under any patent, copyright, trade secret or other intellectual
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property right is granted to or conferred upon you by disclosure or delivery
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of the Materials, either expressly, by implication, inducement, estoppel or
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otherwise. Any license under such intellectual property rights must be
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express and approved by Intel in writing.
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Unless otherwise agreed by Intel in writing, you may not remove or alter
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this notice or any other notice embedded in Materials by Intel or
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Intel's suppliers or licensors in any way.
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This file contains a 'Sample Driver' and is licensed as such under the terms
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of your license agreement with Intel or your vendor. This file may be modified
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by the user, subject to the additional terms of the license agreement.
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@par Specification
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**/
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#include <IndustryStandard/Tpm12.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/Tpm2DeviceLib.h>
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#include <Library/PciSegmentLib.h>
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#include <Library/PttPtpLib.h>
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#include <Guid/PttPTPInstanceGuid.h>
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#define R_PTT_HCI_BASE_ADDRESS 0xFED40000
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/**
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This service enables the sending of commands to the TPM2.
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@param[in] InputParameterBlockSize Size of the TPM2 input parameter block.
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@param[in] InputParameterBlock Pointer to the TPM2 input parameter block.
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@param[in] OutputParameterBlockSize Size of the TPM2 output parameter block.
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@param[in] OutputParameterBlock Pointer to the TPM2 output parameter block.
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@retval EFI_SUCCESS The command byte stream was successfully sent to the device and a response was successfully received.
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@retval EFI_DEVICE_ERROR The command was not successfully sent to the device or a response was not successfully received from the device.
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@retval EFI_BUFFER_TOO_SMALL The output parameter block is too small.
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**/
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EFI_STATUS
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EFIAPI
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PttSubmitCommand (
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IN UINT32 InputParameterBlockSize,
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IN UINT8 *InputParameterBlock,
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IN OUT UINT32 *OutputParameterBlockSize,
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IN UINT8 *OutputParameterBlock
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)
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{
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return PttHciSubmitCommand(InputParameterBlock, InputParameterBlockSize, OutputParameterBlock, OutputParameterBlockSize);
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}
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EFI_STATUS
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EFIAPI
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PttRequestUseTpm (
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VOID
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)
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{
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BOOLEAN IsPttEnabled;
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UINT32 Data32;
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IsPttEnabled = FALSE;
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//
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// Check if it's SV ME FW first
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// Read FirmwareStatus register D22:F0:40h BIT[3:0]
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//
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Data32 = (PciSegmentRead32 (PCI_SEGMENT_LIB_ADDRESS (0, 0, 22, 0, 0x40))) & 0x0F;
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//
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// Return error if SV ME FW detected
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// ME_STATE_SV_FW = 0x0F
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//
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if (Data32 == 0x0F) {
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return EFI_DEVICE_ERROR;
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}
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if ((*(UINT8 *) (UINTN) (R_PTT_HCI_BASE_ADDRESS + R_TPM_INTERFACE_ID) != 0xFF)) {
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IsPttEnabled = TRUE;
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}
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if(!IsPttEnabled)
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{
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return EFI_DEVICE_ERROR;
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}
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return EFI_SUCCESS;
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}
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TPM2_DEVICE_INTERFACE mPttInternalTpm2Device = {
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TPM_DEVICE_INTERFACE_TPM20_PTT_PTP,
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PttSubmitCommand,
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PttRequestUseTpm,
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};
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EFI_STATUS
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EFIAPI
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Tpm2InstanceLibPttConstructor (
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VOID
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)
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{
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EFI_STATUS Status;
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Status = Tpm2RegisterTpm2DeviceLib (&mPttInternalTpm2Device);
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if ((Status == EFI_SUCCESS) || (Status == EFI_UNSUPPORTED)) {
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//
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// Unsupported means platform policy does not need this instance enabled.
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//
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return EFI_SUCCESS;
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}
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return Status;
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}
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