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1 | /** @file\r |
2 | TCG MOR (Memory Overwrite Request) Lock Control Driver SMM wrapper.\r | |
3 | \r | |
4 | Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials \r | |
6 | are licensed and made available under the terms and conditions of the BSD License \r | |
7 | which accompanies this distribution. The full text of the license may be found at \r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include <PiSmm.h>\r | |
16 | #include <Library/SmmServicesTableLib.h>\r | |
17 | #include <Library/DebugLib.h>\r | |
18 | #include <Protocol/SmmVarCheck.h>\r | |
19 | #include <Protocol/SmmVariable.h>\r | |
20 | #include "TcgMorLock.h"\r | |
21 | \r | |
22 | EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable;\r | |
23 | \r | |
24 | /**\r | |
25 | This service is a wrapper for the UEFI Runtime Service GetVariable().\r | |
26 | \r | |
27 | @param VariableName the name of the vendor's variable, it's a Null-Terminated Unicode String\r | |
28 | @param VendorGuid Unify identifier for vendor.\r | |
29 | @param Attributes Point to memory location to return the attributes of variable. If the point\r | |
30 | is NULL, the parameter would be ignored.\r | |
31 | @param DataSize As input, point to the maximum size of return Data-Buffer.\r | |
32 | As output, point to the actual size of the returned Data-Buffer.\r | |
33 | @param Data Point to return Data-Buffer.\r | |
34 | \r | |
35 | @retval EFI_SUCCESS The function completed successfully.\r | |
36 | @retval EFI_NOT_FOUND The variable was not found.\r | |
37 | @retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the result. DataSize has\r | |
38 | been updated with the size needed to complete the request.\r | |
39 | @retval EFI_INVALID_PARAMETER VariableName is NULL.\r | |
40 | @retval EFI_INVALID_PARAMETER VendorGuid is NULL.\r | |
41 | @retval EFI_INVALID_PARAMETER DataSize is NULL.\r | |
42 | @retval EFI_INVALID_PARAMETER The DataSize is not too small and Data is NULL.\r | |
43 | @retval EFI_DEVICE_ERROR The variable could not be retrieved due to a hardware error.\r | |
44 | @retval EFI_SECURITY_VIOLATION The variable could not be retrieved due to an authentication failure.\r | |
45 | **/\r | |
46 | EFI_STATUS\r | |
47 | EFIAPI\r | |
48 | InternalGetVariable (\r | |
49 | IN CHAR16 *VariableName,\r | |
50 | IN EFI_GUID *VendorGuid,\r | |
51 | OUT UINT32 *Attributes OPTIONAL,\r | |
52 | IN OUT UINTN *DataSize,\r | |
53 | OUT VOID *Data\r | |
54 | )\r | |
55 | {\r | |
56 | return mSmmVariable->SmmGetVariable (\r | |
57 | VariableName,\r | |
58 | VendorGuid,\r | |
59 | Attributes,\r | |
60 | DataSize,\r | |
61 | Data\r | |
62 | );\r | |
63 | }\r | |
64 | \r | |
65 | /**\r | |
66 | This service is a wrapper for the UEFI Runtime Service SetVariable()\r | |
67 | \r | |
68 | @param VariableName the name of the vendor's variable, as a\r | |
69 | Null-Terminated Unicode String\r | |
70 | @param VendorGuid Unify identifier for vendor.\r | |
71 | @param Attributes Point to memory location to return the attributes of variable. If the point\r | |
72 | is NULL, the parameter would be ignored.\r | |
73 | @param DataSize The size in bytes of Data-Buffer.\r | |
74 | @param Data Point to the content of the variable.\r | |
75 | \r | |
76 | @retval EFI_SUCCESS The firmware has successfully stored the variable and its data as\r | |
77 | defined by the Attributes.\r | |
78 | @retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied, or the\r | |
79 | DataSize exceeds the maximum allowed.\r | |
80 | @retval EFI_INVALID_PARAMETER VariableName is an empty Unicode string.\r | |
81 | @retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold the variable and its data.\r | |
82 | @retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.\r | |
83 | @retval EFI_WRITE_PROTECTED The variable in question is read-only.\r | |
84 | @retval EFI_WRITE_PROTECTED The variable in question cannot be deleted.\r | |
85 | @retval EFI_SECURITY_VIOLATION The variable could not be written due to EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\r | |
86 | set but the AuthInfo does NOT pass the validation check carried\r | |
87 | out by the firmware.\r | |
88 | @retval EFI_NOT_FOUND The variable trying to be updated or deleted was not found.\r | |
89 | \r | |
90 | **/\r | |
91 | EFI_STATUS\r | |
92 | EFIAPI\r | |
93 | InternalSetVariable (\r | |
94 | IN CHAR16 *VariableName,\r | |
95 | IN EFI_GUID *VendorGuid,\r | |
96 | IN UINT32 Attributes,\r | |
97 | IN UINTN DataSize,\r | |
98 | IN VOID *Data\r | |
99 | )\r | |
100 | {\r | |
101 | return mSmmVariable->SmmSetVariable (\r | |
102 | VariableName,\r | |
103 | VendorGuid,\r | |
104 | Attributes,\r | |
105 | DataSize,\r | |
106 | Data\r | |
107 | );\r | |
108 | }\r | |
109 | \r | |
110 | /**\r | |
111 | Entry Point for MOR Lock Control driver.\r | |
112 | \r | |
113 | @param[in] ImageHandle The firmware allocated handle for the EFI image.\r | |
114 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
115 | \r | |
116 | @retval EFI_SUCCESS EntryPoint runs successfully.\r | |
117 | \r | |
118 | **/\r | |
119 | EFI_STATUS\r | |
120 | EFIAPI\r | |
121 | MorLockDriverEntryPointSmm (\r | |
122 | IN EFI_HANDLE ImageHandle,\r | |
123 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
124 | )\r | |
125 | {\r | |
126 | EFI_STATUS Status;\r | |
127 | EDKII_SMM_VAR_CHECK_PROTOCOL *SmmVarCheck;\r | |
128 | \r | |
129 | //\r | |
130 | // This driver link to Smm Variable driver\r | |
131 | //\r | |
132 | DEBUG ((EFI_D_INFO, "MorLockDriverEntryPointSmm\n"));\r | |
133 | \r | |
134 | Status = gSmst->SmmLocateProtocol (\r | |
135 | &gEfiSmmVariableProtocolGuid,\r | |
136 | NULL,\r | |
137 | (VOID **) &mSmmVariable\r | |
138 | );\r | |
139 | ASSERT_EFI_ERROR (Status);\r | |
140 | \r | |
141 | Status = gSmst->SmmLocateProtocol (\r | |
142 | &gEdkiiSmmVarCheckProtocolGuid,\r | |
143 | NULL,\r | |
144 | (VOID **) &SmmVarCheck\r | |
145 | );\r | |
146 | ASSERT_EFI_ERROR (Status);\r | |
147 | \r | |
148 | Status = MorLockDriverInit ();\r | |
149 | if (EFI_ERROR (Status)) {\r | |
150 | return Status;\r | |
151 | }\r | |
152 | \r | |
153 | Status = SmmVarCheck->SmmRegisterSetVariableCheckHandler (SetVariableCheckHandlerMor);\r | |
154 | ASSERT_EFI_ERROR (Status);\r | |
155 | \r | |
156 | return Status;\r | |
157 | }\r | |
158 | \r |