SecurityPkg/Tcg/TcgConfigDxe/TcgConfigDriver.c

   1 /** @file
   2   The module entry point for Tcg configuration module.
   3
   4 Copyright (c) 2011 - 2014, 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 "TcgConfigImpl.h"
  16 #include <Guid/TpmInstance.h>
  17
  18 /**
  19   The entry point for Tcg configuration driver.
  20
  21   @param[in]  ImageHandle        The image handle of the driver.
  22   @param[in]  SystemTable        The system table.
  23
  24   @retval EFI_ALREADY_STARTED    The driver already exists in system.
  25   @retval EFI_OUT_OF_RESOURCES   Fail to execute entry point due to lack of resources.
  26   @retval EFI_SUCCES             All the related protocols are installed on the driver.
  27   @retval Others                 Fail to install protocols as indicated.
  28
  29 **/
  30 EFI_STATUS
  31 EFIAPI
  32 TcgConfigDriverEntryPoint (
  33   IN EFI_HANDLE          ImageHandle,
  34   IN EFI_SYSTEM_TABLE    *SystemTable
  35   )
  36 {
  37   EFI_STATUS                Status;
  38   TCG_CONFIG_PRIVATE_DATA   *PrivateData;
  39   EFI_TCG_PROTOCOL          *TcgProtocol;
  40
  41   if (!CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceTpm12Guid)){
  42     DEBUG ((EFI_D_ERROR, "No TPM12 instance required!\n"));
  43     return EFI_UNSUPPORTED;
  44   }
  45
  46   Status = TisPcRequestUseTpm ((TIS_TPM_HANDLE) (UINTN) TPM_BASE_ADDRESS);
  47   if (EFI_ERROR (Status)) {
  48     DEBUG ((EFI_D_ERROR, "TPM not detected!\n"));
  49     return Status;
  50   }
  51
  52   Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &TcgProtocol);
  53   if (EFI_ERROR (Status)) {
  54     TcgProtocol = NULL;
  55   }
  56
  57   Status = gBS->OpenProtocol (
  58                   ImageHandle,
  59                   &gEfiCallerIdGuid,
  60                   NULL,
  61                   ImageHandle,
  62                   ImageHandle,
  63                   EFI_OPEN_PROTOCOL_TEST_PROTOCOL
  64                   );
  65   if (!EFI_ERROR (Status)) {
  66     return EFI_ALREADY_STARTED;
  67   }
  68
  69   //
  70   // Create a private data structure.
  71   //
  72   PrivateData = AllocateCopyPool (sizeof (TCG_CONFIG_PRIVATE_DATA), &mTcgConfigPrivateDateTemplate);
  73   if (PrivateData == NULL) {
  74     return EFI_OUT_OF_RESOURCES;
  75   }
  76
  77   PrivateData->TcgProtocol = TcgProtocol;
  78
  79   //
  80   // Install TCG configuration form
  81   //
  82   Status = InstallTcgConfigForm (PrivateData);
  83   if (EFI_ERROR (Status)) {
  84     goto ErrorExit;
  85   }
  86
  87   //
  88   // Install private GUID.
  89   //
  90   Status = gBS->InstallMultipleProtocolInterfaces (
  91                   &ImageHandle,
  92                   &gEfiCallerIdGuid,
  93                   PrivateData,
  94                   NULL
  95                   );
  96
  97   if (EFI_ERROR (Status)) {
  98     goto ErrorExit;
  99   }
 100
 101   return EFI_SUCCESS;
 102
 103 ErrorExit:
 104   if (PrivateData != NULL) {
 105     UninstallTcgConfigForm (PrivateData);
 106   }
 107
 108   return Status;
 109 }
 110
 111 /**
 112   Unload the Tcg configuration form.
 113
 114   @param[in]  ImageHandle         The driver's image handle.
 115
 116   @retval     EFI_SUCCESS         The Tcg configuration form is unloaded.
 117   @retval     Others              Failed to unload the form.
 118
 119 **/
 120 EFI_STATUS
 121 EFIAPI
 122 TcgConfigDriverUnload (
 123   IN EFI_HANDLE  ImageHandle
 124   )
 125 {
 126   EFI_STATUS                  Status;
 127   TCG_CONFIG_PRIVATE_DATA   *PrivateData;
 128
 129   Status = gBS->HandleProtocol (
 130                   ImageHandle,
 131                   &gEfiCallerIdGuid,
 132                   (VOID **) &PrivateData
 133                   );
 134   if (EFI_ERROR (Status)) {
 135     return Status;
 136   }
 137
 138   ASSERT (PrivateData->Signature == TCG_CONFIG_PRIVATE_DATA_SIGNATURE);
 139
 140   gBS->UninstallMultipleProtocolInterfaces (
 141          &ImageHandle,
 142          &gEfiCallerIdGuid,
 143          PrivateData,
 144          NULL
 145          );
 146
 147   UninstallTcgConfigForm (PrivateData);
 148
 149   return EFI_SUCCESS;
 150 }