SecurityPkg/Tcg/TcgConfigDxe/TcgConfigDriver.c

   1 /** @file
   2   The module entry point for Tcg configuration module.
   3
   4 Copyright (c) 2011, 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
  17 /**
  18   The entry point for Tcg configuration driver.
  19
  20   @param[in]  ImageHandle        The image handle of the driver.
  21   @param[in]  SystemTable        The system table.
  22
  23   @retval EFI_ALREADY_STARTED    The driver already exists in system.
  24   @retval EFI_OUT_OF_RESOURCES   Fail to execute entry point due to lack of resources.
  25   @retval EFI_SUCCES             All the related protocols are installed on the driver.
  26   @retval Others                 Fail to install protocols as indicated.
  27
  28 **/
  29 EFI_STATUS
  30 EFIAPI
  31 TcgConfigDriverEntryPoint (
  32   IN EFI_HANDLE          ImageHandle,
  33   IN EFI_SYSTEM_TABLE    *SystemTable
  34   )
  35 {
  36   EFI_STATUS                Status;
  37   TCG_CONFIG_PRIVATE_DATA   *PrivateData;
  38   EFI_TCG_PROTOCOL          *TcgProtocol;
  39
  40   Status = TisPcRequestUseTpm ((TIS_TPM_HANDLE) (UINTN) TPM_BASE_ADDRESS);
  41   if (EFI_ERROR (Status)) {
  42     DEBUG ((EFI_D_ERROR, "TPM not detected!\n"));
  43     return Status;
  44   }
  45
  46   Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **) &TcgProtocol);
  47   if (EFI_ERROR (Status)) {
  48     TcgProtocol = NULL;
  49   }
  50
  51   Status = gBS->OpenProtocol (
  52                   ImageHandle,
  53                   &gEfiCallerIdGuid,
  54                   NULL,
  55                   ImageHandle,
  56                   ImageHandle,
  57                   EFI_OPEN_PROTOCOL_TEST_PROTOCOL
  58                   );
  59   if (!EFI_ERROR (Status)) {
  60     return EFI_ALREADY_STARTED;
  61   }
  62
  63   //
  64   // Create a private data structure.
  65   //
  66   PrivateData = AllocateCopyPool (sizeof (TCG_CONFIG_PRIVATE_DATA), &mTcgConfigPrivateDateTemplate);
  67   if (PrivateData == NULL) {
  68     return EFI_OUT_OF_RESOURCES;
  69   }
  70
  71   PrivateData->TcgProtocol = TcgProtocol;
  72   PrivateData->HideTpm     = (BOOLEAN) (PcdGetBool (PcdHideTpmSupport) && PcdGetBool (PcdHideTpm));
  73
  74   //
  75   // Install TCG configuration form
  76   //
  77   Status = InstallTcgConfigForm (PrivateData);
  78   if (EFI_ERROR (Status)) {
  79     goto ErrorExit;
  80   }
  81
  82   //
  83   // Install private GUID.
  84   //
  85   Status = gBS->InstallMultipleProtocolInterfaces (
  86                   &ImageHandle,
  87                   &gEfiCallerIdGuid,
  88                   PrivateData,
  89                   NULL
  90                   );
  91
  92   if (EFI_ERROR (Status)) {
  93     goto ErrorExit;
  94   }
  95
  96   return EFI_SUCCESS;
  97
  98 ErrorExit:
  99   if (PrivateData != NULL) {
 100     UninstallTcgConfigForm (PrivateData);
 101   }
 102
 103   return Status;
 104 }
 105
 106 /**
 107   Unload the Tcg configuration form.
 108
 109   @param[in]  ImageHandle         The driver's image handle.
 110
 111   @retval     EFI_SUCCESS         The Tcg configuration form is unloaded.
 112   @retval     Others              Failed to unload the form.
 113
 114 **/
 115 EFI_STATUS
 116 EFIAPI
 117 TcgConfigDriverUnload (
 118   IN EFI_HANDLE  ImageHandle
 119   )
 120 {
 121   EFI_STATUS                  Status;
 122   TCG_CONFIG_PRIVATE_DATA   *PrivateData;
 123
 124   Status = gBS->HandleProtocol (
 125                   ImageHandle,
 126                   &gEfiCallerIdGuid,
 127                   (VOID **) &PrivateData
 128                   );
 129   if (EFI_ERROR (Status)) {
 130     return Status;
 131   }
 132
 133   ASSERT (PrivateData->Signature == TCG_CONFIG_PRIVATE_DATA_SIGNATURE);
 134
 135   gBS->UninstallMultipleProtocolInterfaces (
 136          &ImageHandle,
 137          &gEfiCallerIdGuid,
 138          PrivateData,
 139          NULL
 140          );
 141
 142   UninstallTcgConfigForm (PrivateData);
 143
 144   return EFI_SUCCESS;
 145 }