1 /** @file 2 Ihis library is TPM2 TCG2 protocol lib. 3 4 Copyright (c) 2013, Intel Corporation. All rights reserved. <BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include <Library/BaseLib.h> 16 #include <Library/BaseMemoryLib.h> 17 #include <Library/DebugLib.h> 18 #include <Library/UefiBootServicesTableLib.h> 19 #include <Library/Tpm2DeviceLib.h> 20 #include <Protocol/Tcg2Protocol.h> 21 #include <IndustryStandard/Tpm20.h> 22 23 EFI_TCG2_PROTOCOL *mTcg2Protocol = NULL; 24 25 /** 26 This service enables the sending of commands to the TPM2. 27 28 @param[in] InputParameterBlockSize Size of the TPM2 input parameter block. 29 @param[in] InputParameterBlock Pointer to the TPM2 input parameter block. 30 @param[in,out] OutputParameterBlockSize Size of the TPM2 output parameter block. 31 @param[in] OutputParameterBlock Pointer to the TPM2 output parameter block. 32 33 @retval EFI_SUCCESS The command byte stream was successfully sent to the device and a response was successfully received. 34 @retval EFI_DEVICE_ERROR The command was not successfully sent to the device or a response was not successfully received from the device. 35 @retval EFI_BUFFER_TOO_SMALL The output parameter block is too small. 36 **/ 37 EFI_STATUS 38 EFIAPI 39 Tpm2SubmitCommand ( 40 IN UINT32 InputParameterBlockSize, 41 IN UINT8 *InputParameterBlock, 42 IN OUT UINT32 *OutputParameterBlockSize, 43 IN UINT8 *OutputParameterBlock 44 ) 45 { 46 EFI_STATUS Status; 47 TPM2_RESPONSE_HEADER *Header; 48 49 if (mTcg2Protocol == NULL) { 50 Status = gBS->LocateProtocol (&gEfiTcg2ProtocolGuid, NULL, (VOID **) &mTcg2Protocol); 51 if (EFI_ERROR (Status)) { 52 // 53 // Tcg2 protocol is not installed. So, TPM2 is not present. 54 // 55 DEBUG ((EFI_D_ERROR, "Tpm2SubmitCommand - Tcg2 - %r\n", Status)); 56 return EFI_NOT_FOUND; 57 } 58 } 59 // 60 // Assume when Tcg2 Protocol is ready, RequestUseTpm already done. 61 // 62 Status = mTcg2Protocol->SubmitCommand ( 63 mTcg2Protocol, 64 InputParameterBlockSize, 65 InputParameterBlock, 66 *OutputParameterBlockSize, 67 OutputParameterBlock 68 ); 69 if (EFI_ERROR (Status)) { 70 return Status; 71 } 72 Header = (TPM2_RESPONSE_HEADER *)OutputParameterBlock; 73 *OutputParameterBlockSize = SwapBytes32 (Header->paramSize); 74 75 return EFI_SUCCESS; 76 } 77 78 /** 79 This service requests use TPM2. 80 81 @retval EFI_SUCCESS Get the control of TPM2 chip. 82 @retval EFI_NOT_FOUND TPM2 not found. 83 @retval EFI_DEVICE_ERROR Unexpected device behavior. 84 **/ 85 EFI_STATUS 86 EFIAPI 87 Tpm2RequestUseTpm ( 88 VOID 89 ) 90 { 91 EFI_STATUS Status; 92 93 if (mTcg2Protocol == NULL) { 94 Status = gBS->LocateProtocol (&gEfiTcg2ProtocolGuid, NULL, (VOID **) &mTcg2Protocol); 95 if (EFI_ERROR (Status)) { 96 // 97 // Tcg2 protocol is not installed. So, TPM2 is not present. 98 // 99 DEBUG ((EFI_D_ERROR, "Tpm2RequestUseTpm - Tcg2 - %r\n", Status)); 100 return EFI_NOT_FOUND; 101 } 102 } 103 // 104 // Assume when Tcg2 Protocol is ready, RequestUseTpm already done. 105 // 106 return EFI_SUCCESS; 107 } 108 109 /** 110 This service register TPM2 device. 111 112 @param Tpm2Device TPM2 device 113 114 @retval EFI_SUCCESS This TPM2 device is registered successfully. 115 @retval EFI_UNSUPPORTED System does not support register this TPM2 device. 116 @retval EFI_ALREADY_STARTED System already register this TPM2 device. 117 **/ 118 EFI_STATUS 119 EFIAPI 120 Tpm2RegisterTpm2DeviceLib ( 121 IN TPM2_DEVICE_INTERFACE *Tpm2Device 122 ) 123 { 124 return EFI_UNSUPPORTED; 125 } 126
