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b96fef9f | 1 | /** @file\r |
2 | Boot Script Helper SMM driver.\r | |
3 | \r | |
bad73446 | 4 | This driver is responsible to store BootScriptThunk from ReservedMemory to SMRAM for security consideration.\r |
b96fef9f | 5 | \r |
bad73446 | 6 | Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>\r |
b96fef9f | 7 | \r |
8 | This program and the accompanying materials\r | |
9 | are licensed and made available under the terms and conditions\r | |
10 | of the BSD License which accompanies this distribution. The\r | |
11 | full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
13 | \r | |
14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
15 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
16 | \r | |
17 | **/\r | |
18 | \r | |
19 | #include <PiDxe.h>\r | |
20 | #include <Library/BaseLib.h>\r | |
21 | #include <Library/PcdLib.h>\r | |
22 | #include <Library/DebugLib.h>\r | |
23 | #include <Library/LockBoxLib.h>\r | |
24 | \r | |
25 | #include <Guid/BootScriptThunkData.h>\r | |
26 | \r | |
27 | EFI_GUID mBootScriptThunkGuid = {\r | |
28 | 0xa053f561, 0xf56b, 0x4140, {0x89, 0x1, 0xb4, 0xcb, 0x5d, 0x70, 0x92, 0x9e}\r | |
29 | };\r | |
30 | \r | |
31 | /**\r | |
32 | Entry point function of the Boot Script Thunk Helper SMM driver.\r | |
33 | \r | |
34 | @param[in] ImageHandle The firmware allocated handle for the EFI image. \r | |
35 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
36 | \r | |
37 | @retval EFI_SUCCESS The entry point is executed successfully.\r | |
38 | @retval other Some error occurs when executing this entry point.\r | |
39 | **/\r | |
40 | EFI_STATUS\r | |
41 | EFIAPI\r | |
42 | BootScriptThunkHelperMain (\r | |
43 | IN EFI_HANDLE ImageHandle,\r | |
44 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
45 | )\r | |
46 | {\r | |
47 | BOOT_SCRIPT_THUNK_DATA *BootScriptThunkData;\r | |
48 | EFI_STATUS Status;\r | |
49 | \r | |
50 | //\r | |
51 | // Get BootScriptThunk variable\r | |
52 | //\r | |
53 | BootScriptThunkData = (BOOT_SCRIPT_THUNK_DATA *)(UINTN)PcdGet64(BootScriptThunkDataPtr);\r | |
54 | ASSERT (BootScriptThunkData != NULL);\r | |
55 | if (BootScriptThunkData == NULL) {\r | |
56 | return EFI_NOT_FOUND;\r | |
57 | }\r | |
58 | \r | |
59 | //\r | |
60 | // Save BootScriptThunk image\r | |
61 | //\r | |
62 | Status = SaveLockBox (\r | |
63 | &mBootScriptThunkGuid,\r | |
64 | (VOID *)(UINTN)BootScriptThunkData->BootScriptThunkBase,\r | |
65 | (UINTN)BootScriptThunkData->BootScriptThunkLength\r | |
66 | );\r | |
67 | ASSERT_EFI_ERROR (Status);\r | |
68 | \r | |
69 | Status = SetLockBoxAttributes (&mBootScriptThunkGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);\r | |
70 | ASSERT_EFI_ERROR (Status);\r | |
71 | \r | |
72 | return Status;\r | |
73 | }\r |