1 /** @file 2 TCG MOR (Memory Overwrite Request) Lock Control Driver SMM wrapper. 3 4 Copyright (c) 2015, 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 <PiSmm.h> 16 #include <Library/SmmServicesTableLib.h> 17 #include <Library/DebugLib.h> 18 #include <Protocol/SmmVarCheck.h> 19 #include <Protocol/SmmVariable.h> 20 #include "TcgMorLock.h" 21 22 EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable; 23 24 /** 25 This service is a wrapper for the UEFI Runtime Service GetVariable(). 26 27 @param VariableName the name of the vendor's variable, it's a Null-Terminated Unicode String 28 @param VendorGuid Unify identifier for vendor. 29 @param Attributes Point to memory location to return the attributes of variable. If the point 30 is NULL, the parameter would be ignored. 31 @param DataSize As input, point to the maximum size of return Data-Buffer. 32 As output, point to the actual size of the returned Data-Buffer. 33 @param Data Point to return Data-Buffer. 34 35 @retval EFI_SUCCESS The function completed successfully. 36 @retval EFI_NOT_FOUND The variable was not found. 37 @retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the result. DataSize has 38 been updated with the size needed to complete the request. 39 @retval EFI_INVALID_PARAMETER VariableName is NULL. 40 @retval EFI_INVALID_PARAMETER VendorGuid is NULL. 41 @retval EFI_INVALID_PARAMETER DataSize is NULL. 42 @retval EFI_INVALID_PARAMETER The DataSize is not too small and Data is NULL. 43 @retval EFI_DEVICE_ERROR The variable could not be retrieved due to a hardware error. 44 @retval EFI_SECURITY_VIOLATION The variable could not be retrieved due to an authentication failure. 45 **/ 46 EFI_STATUS 47 EFIAPI 48 InternalGetVariable ( 49 IN CHAR16 *VariableName, 50 IN EFI_GUID *VendorGuid, 51 OUT UINT32 *Attributes OPTIONAL, 52 IN OUT UINTN *DataSize, 53 OUT VOID *Data 54 ) 55 { 56 return mSmmVariable->SmmGetVariable ( 57 VariableName, 58 VendorGuid, 59 Attributes, 60 DataSize, 61 Data 62 ); 63 } 64 65 /** 66 This service is a wrapper for the UEFI Runtime Service SetVariable() 67 68 @param VariableName the name of the vendor's variable, as a 69 Null-Terminated Unicode String 70 @param VendorGuid Unify identifier for vendor. 71 @param Attributes Point to memory location to return the attributes of variable. If the point 72 is NULL, the parameter would be ignored. 73 @param DataSize The size in bytes of Data-Buffer. 74 @param Data Point to the content of the variable. 75 76 @retval EFI_SUCCESS The firmware has successfully stored the variable and its data as 77 defined by the Attributes. 78 @retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied, or the 79 DataSize exceeds the maximum allowed. 80 @retval EFI_INVALID_PARAMETER VariableName is an empty Unicode string. 81 @retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold the variable and its data. 82 @retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure. 83 @retval EFI_WRITE_PROTECTED The variable in question is read-only. 84 @retval EFI_WRITE_PROTECTED The variable in question cannot be deleted. 85 @retval EFI_SECURITY_VIOLATION The variable could not be written due to EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 86 set but the AuthInfo does NOT pass the validation check carried 87 out by the firmware. 88 @retval EFI_NOT_FOUND The variable trying to be updated or deleted was not found. 89 90 **/ 91 EFI_STATUS 92 EFIAPI 93 InternalSetVariable ( 94 IN CHAR16 *VariableName, 95 IN EFI_GUID *VendorGuid, 96 IN UINT32 Attributes, 97 IN UINTN DataSize, 98 IN VOID *Data 99 ) 100 { 101 return mSmmVariable->SmmSetVariable ( 102 VariableName, 103 VendorGuid, 104 Attributes, 105 DataSize, 106 Data 107 ); 108 } 109 110 /** 111 Entry Point for MOR Lock Control driver. 112 113 @param[in] ImageHandle The firmware allocated handle for the EFI image. 114 @param[in] SystemTable A pointer to the EFI System Table. 115 116 @retval EFI_SUCCESS EntryPoint runs successfully. 117 118 **/ 119 EFI_STATUS 120 EFIAPI 121 MorLockDriverEntryPointSmm ( 122 IN EFI_HANDLE ImageHandle, 123 IN EFI_SYSTEM_TABLE *SystemTable 124 ) 125 { 126 EFI_STATUS Status; 127 EDKII_SMM_VAR_CHECK_PROTOCOL *SmmVarCheck; 128 129 // 130 // This driver link to Smm Variable driver 131 // 132 DEBUG ((EFI_D_INFO, "MorLockDriverEntryPointSmm\n")); 133 134 Status = gSmst->SmmLocateProtocol ( 135 &gEfiSmmVariableProtocolGuid, 136 NULL, 137 (VOID **) &mSmmVariable 138 ); 139 ASSERT_EFI_ERROR (Status); 140 141 Status = gSmst->SmmLocateProtocol ( 142 &gEdkiiSmmVarCheckProtocolGuid, 143 NULL, 144 (VOID **) &SmmVarCheck 145 ); 146 ASSERT_EFI_ERROR (Status); 147 148 Status = MorLockDriverInit (); 149 if (EFI_ERROR (Status)) { 150 return Status; 151 } 152 153 Status = SmmVarCheck->SmmRegisterSetVariableCheckHandler (SetVariableCheckHandlerMor); 154 ASSERT_EFI_ERROR (Status); 155 156 return Status; 157 } 158 159
