1 /** @file 2 Ihis library is TPM12 TCG 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 <Uefi.h> 16 #include <Library/BaseLib.h> 17 #include <Library/BaseMemoryLib.h> 18 #include <Library/DebugLib.h> 19 #include <Library/UefiBootServicesTableLib.h> 20 #include <Library/Tpm12DeviceLib.h> 21 #include <Protocol/TcgService.h> 22 #include <IndustryStandard/Tpm12.h> 23 24 EFI_TCG_PROTOCOL *mTcgProtocol = NULL; 25 26 /** 27 This service enables the sending of commands to the TPM12. 28 29 @param[in] InputParameterBlockSize Size of the TPM12 input parameter block. 30 @param[in] InputParameterBlock Pointer to the TPM12 input parameter block. 31 @param[in,out] OutputParameterBlockSize Size of the TPM12 output parameter block. 32 @param[in] OutputParameterBlock Pointer to the TPM12 output parameter block. 33 34 @retval EFI_SUCCESS The command byte stream was successfully sent to the device and a response was successfully received. 35 @retval EFI_DEVICE_ERROR The command was not successfully sent to the device or a response was not successfully received from the device. 36 @retval EFI_BUFFER_TOO_SMALL The output parameter block is too small. 37 **/ 38 EFI_STATUS 39 EFIAPI 40 Tpm12SubmitCommand ( 41 IN UINT32 InputParameterBlockSize, 42 IN UINT8 *InputParameterBlock, 43 IN OUT UINT32 *OutputParameterBlockSize, 44 IN UINT8 *OutputParameterBlock 45 ) 46 { 47 EFI_STATUS Status; 48 TPM_RSP_COMMAND_HDR *Header; 49 50 if (mTcgProtocol == NULL) { 51 Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &mTcgProtocol); 52 if (EFI_ERROR (Status)) { 53 // 54 // TCG protocol is not installed. So, TPM12 is not present. 55 // 56 DEBUG ((EFI_D_ERROR, "Tpm12SubmitCommand - TCG - %r\n", Status)); 57 return EFI_NOT_FOUND; 58 } 59 } 60 // 61 // Assume when TCG Protocol is ready, RequestUseTpm already done. 62 // 63 Status = mTcgProtocol->PassThroughToTpm ( 64 mTcgProtocol, 65 InputParameterBlockSize, 66 InputParameterBlock, 67 *OutputParameterBlockSize, 68 OutputParameterBlock 69 ); 70 if (EFI_ERROR (Status)) { 71 return Status; 72 } 73 Header = (TPM_RSP_COMMAND_HDR *)OutputParameterBlock; 74 *OutputParameterBlockSize = SwapBytes32 (Header->paramSize); 75 76 return EFI_SUCCESS; 77 } 78 79 /** 80 This service requests use TPM12. 81 82 @retval EFI_SUCCESS Get the control of TPM12 chip. 83 @retval EFI_NOT_FOUND TPM12 not found. 84 @retval EFI_DEVICE_ERROR Unexpected device behavior. 85 **/ 86 EFI_STATUS 87 EFIAPI 88 Tpm12RequestUseTpm ( 89 VOID 90 ) 91 { 92 EFI_STATUS Status; 93 94 if (mTcgProtocol == NULL) { 95 Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &mTcgProtocol); 96 if (EFI_ERROR (Status)) { 97 // 98 // TCG protocol is not installed. So, TPM12 is not present. 99 // 100 DEBUG ((EFI_D_ERROR, "Tpm12RequestUseTpm - TCG - %r\n", Status)); 101 return EFI_NOT_FOUND; 102 } 103 } 104 // 105 // Assume when TCG Protocol is ready, RequestUseTpm already done. 106 // 107 return EFI_SUCCESS; 108 } 109
