SecurityPkg/Library/Tpm12CommandLib/Tpm12Ownership.c

   1 /** @file
   2   Implement TPM1.2 Startup related command.
   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 <IndustryStandard/Tpm12.h>
  17 #include <Library/BaseMemoryLib.h>
  18 #include <Library/BaseLib.h>
  19 #include <Library/Tpm12DeviceLib.h>
  20
  21 #pragma pack(1)
  22
  23 typedef struct {
  24   TPM_RQU_COMMAND_HDR   Hdr;
  25 } TPM_CMD_FORCE_CLEAR;
  26
  27 typedef struct {
  28   TPM_RSP_COMMAND_HDR   Hdr;
  29 } TPM_RSP_FORCE_CLEAR;
  30
  31 #pragma pack()
  32
  33 /**
  34   Send ForceClear command to TPM1.2.
  35
  36   @retval EFI_SUCCESS      Operation completed successfully.
  37   @retval EFI_DEVICE_ERROR Unexpected device behavior.
  38 **/
  39 EFI_STATUS
  40 EFIAPI
  41 Tpm12ForceClear (
  42   VOID
  43   )
  44 {
  45   EFI_STATUS                        Status;
  46   UINT32                            TpmRecvSize;
  47   UINT32                            TpmSendSize;
  48   TPM_CMD_FORCE_CLEAR               SendBuffer;
  49   TPM_RSP_FORCE_CLEAR               RecvBuffer;
  50   UINT32                            ReturnCode;
  51
  52   //
  53   // send Tpm command TPM_ORD_ForceClear
  54   //
  55   TpmRecvSize               = sizeof (TPM_RSP_FORCE_CLEAR);
  56   TpmSendSize               = sizeof (TPM_CMD_FORCE_CLEAR);
  57   SendBuffer.Hdr.tag        = SwapBytes16 (TPM_TAG_RQU_COMMAND);
  58   SendBuffer.Hdr.paramSize  = SwapBytes32 (TpmSendSize);
  59   SendBuffer.Hdr.ordinal    = SwapBytes32 (TPM_ORD_ForceClear);
  60
  61   Status = Tpm12SubmitCommand (TpmSendSize, (UINT8 *)&SendBuffer, &TpmRecvSize, (UINT8 *)&RecvBuffer);
  62   if (EFI_ERROR (Status)) {
  63     return Status;
  64   }
  65   ReturnCode = SwapBytes32(RecvBuffer.Hdr.returnCode);
  66   switch (ReturnCode) {
  67   case TPM_SUCCESS:
  68     return EFI_SUCCESS;
  69   default:
  70     return EFI_DEVICE_ERROR;
  71   }
  72 }