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0c18794e | 1 | /** @file\r |
2 | TCG MOR (Memory Overwrite Request) Control Driver.\r | |
3 | \r | |
4 | This driver initilize MemoryOverwriteRequestControl variable. It \r | |
5 | will clear MOR_CLEAR_MEMORY_BIT bit if it is set.\r | |
6 | \r | |
504dfa9d | 7 | Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>\r |
0c18794e | 8 | This program and the accompanying materials \r |
9 | are licensed and made available under the terms and conditions of the BSD License \r | |
10 | which accompanies this distribution. The full text of the license may be found at \r | |
11 | http://opensource.org/licenses/bsd-license.php\r | |
12 | \r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
15 | \r | |
16 | **/\r | |
17 | \r | |
18 | #include "TcgMor.h"\r | |
19 | \r | |
504dfa9d | 20 | UINT8 mMorControl;\r |
21 | \r | |
22 | /**\r | |
23 | Ready to Boot Event notification handler.\r | |
24 | \r | |
25 | Sequence of OS boot events is measured in this event notification handler.\r | |
26 | \r | |
27 | @param[in] Event Event whose notification function is being invoked\r | |
28 | @param[in] Context Pointer to the notification function's context\r | |
29 | \r | |
30 | **/\r | |
31 | VOID\r | |
32 | EFIAPI\r | |
33 | OnReadyToBoot (\r | |
34 | IN EFI_EVENT Event,\r | |
35 | IN VOID *Context\r | |
36 | )\r | |
37 | {\r | |
38 | UINTN DataSize;\r | |
39 | \r | |
40 | if (MOR_CLEAR_MEMORY_VALUE (mMorControl) == 0x0) {\r | |
41 | //\r | |
42 | // MorControl is expected, directly return to avoid unnecessary variable operation\r | |
43 | //\r | |
44 | return ;\r | |
45 | }\r | |
46 | //\r | |
47 | // Clear MOR_CLEAR_MEMORY_BIT\r | |
48 | //\r | |
49 | DEBUG ((EFI_D_INFO, "TcgMor: Clear MorClearMemory bit\n"));\r | |
50 | mMorControl &= 0xFE; \r | |
51 | \r | |
52 | DataSize = sizeof (mMorControl);\r | |
53 | gRT->SetVariable (\r | |
54 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME, \r | |
55 | &gEfiMemoryOverwriteControlDataGuid, \r | |
56 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
57 | DataSize, \r | |
58 | &mMorControl\r | |
59 | );\r | |
60 | \r | |
61 | }\r | |
62 | \r | |
63 | \r | |
0c18794e | 64 | /**\r |
65 | Entry Point for TCG MOR Control driver.\r | |
66 | \r | |
67 | @param[in] ImageHandle Image handle of this driver.\r | |
68 | @param[in] SystemTable A Pointer to the EFI System Table.\r | |
69 | \r | |
70 | @retval EFI_SUCEESS \r | |
71 | @return Others Some error occurs.\r | |
72 | **/\r | |
73 | EFI_STATUS\r | |
74 | EFIAPI\r | |
75 | MorDriverEntryPoint (\r | |
76 | IN EFI_HANDLE ImageHandle,\r | |
77 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
78 | )\r | |
79 | {\r | |
80 | EFI_STATUS Status;\r | |
0c18794e | 81 | UINTN DataSize;\r |
504dfa9d | 82 | EFI_EVENT Event;\r |
0c18794e | 83 | \r |
84 | ///\r | |
85 | /// The firmware is required to create the MemoryOverwriteRequestControl UEFI variable.\r | |
86 | ///\r | |
87 | \r | |
504dfa9d | 88 | DataSize = sizeof (mMorControl);\r |
0c18794e | 89 | Status = gRT->GetVariable (\r |
90 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME, \r | |
91 | &gEfiMemoryOverwriteControlDataGuid, \r | |
92 | NULL, \r | |
93 | &DataSize, \r | |
504dfa9d | 94 | &mMorControl\r |
0c18794e | 95 | );\r |
96 | if (EFI_ERROR (Status)) {\r | |
97 | //\r | |
98 | // Set default value to 0\r | |
99 | //\r | |
504dfa9d | 100 | mMorControl = 0;\r |
101 | DEBUG ((EFI_D_INFO, "TcgMor: Create gEfiMemoryOverwriteControlDataGuid!\n"));\r | |
102 | Status = gRT->SetVariable (\r | |
103 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME, \r | |
104 | &gEfiMemoryOverwriteControlDataGuid, \r | |
105 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
106 | DataSize, \r | |
107 | &mMorControl\r | |
108 | );\r | |
109 | ASSERT_EFI_ERROR (Status);\r | |
110 | \r | |
0c18794e | 111 | } else {\r |
0c18794e | 112 | //\r |
504dfa9d | 113 | // Create a Ready To Boot Event and Clear the MorControl bit in the call back function.\r |
0c18794e | 114 | //\r |
504dfa9d | 115 | DEBUG ((EFI_D_INFO, "TcgMor: Create ReadyToBoot Event for MorControl Bit cleanning!\n"));\r |
116 | Status = EfiCreateEventReadyToBootEx (\r | |
117 | TPL_CALLBACK,\r | |
118 | OnReadyToBoot,\r | |
119 | NULL,\r | |
120 | &Event\r | |
121 | );\r | |
122 | } \r | |
0c18794e | 123 | \r |
0c18794e | 124 | return Status;\r |
125 | }\r | |
126 | \r | |
127 | \r |