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3cbfba02 DW |
1 | /** @file\r |
2 | A helper driver to save information to SMRAM after SMRR is enabled.\r | |
3 | \r | |
4 | This driver is for ECP platforms.\r | |
5 | \r | |
e0d42561 | 6 | Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>\r |
3cbfba02 DW |
7 | \r\r |
8 | This program and the accompanying materials are licensed and made available under\r\r | |
9 | the terms and conditions of the BSD License that accompanies this distribution. \r\r | |
10 | The full text of the license may be found at \r\r | |
11 | http://opensource.org/licenses/bsd-license.php. \r\r | |
12 | \r\r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r\r | |
14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r\r | |
15 | \r\r | |
16 | \r | |
17 | **/\r | |
18 | \r | |
19 | #include <PiSmm.h>\r | |
20 | #include <Library/DebugLib.h>\r | |
21 | #include <Library/UefiDriverEntryPoint.h>\r | |
22 | #include <Library/UefiRuntimeServicesTableLib.h>\r | |
23 | #include <Library/SmmServicesTableLib.h>\r | |
24 | #include <Library/BaseLib.h>\r | |
25 | #include <Library/BaseMemoryLib.h>\r | |
26 | #include <Library/IoLib.h>\r | |
27 | #include <Protocol/SmmSwDispatch.h>\r | |
28 | #include <Protocol/SmmReadyToLock.h>\r | |
29 | #include <Protocol/SmmControl.h>\r | |
e0d42561 | 30 | #include <Guid/Vlv2DeviceRefCodePkgTokenSpace.h>\r |
3cbfba02 DW |
31 | \r |
32 | #define SMM_FROM_SMBASE_DRIVER 0x55\r | |
33 | #define SMM_FROM_CPU_DRIVER_SAVE_INFO 0x81\r | |
34 | \r | |
35 | #define EFI_SMRAM_CPU_NVS_HEADER_GUID \\r | |
36 | { \\r | |
37 | 0x429501d9, 0xe447, 0x40f4, 0x86, 0x7b, 0x75, 0xc9, 0x3a, 0x1d, 0xb5, 0x4e \\r | |
38 | }\r | |
39 | \r | |
40 | UINT8 mSmiDataRegister;\r | |
41 | BOOLEAN mLocked = FALSE;\r | |
42 | EFI_GUID mSmramCpuNvsHeaderGuid = EFI_SMRAM_CPU_NVS_HEADER_GUID;\r | |
43 | \r | |
44 | /**\r | |
45 | Dispatch function for a Software SMI handler.\r | |
46 | \r | |
47 | @param DispatchHandle The handle of this dispatch function.\r | |
48 | @param DispatchContext The pointer to the dispatch function's context.\r | |
49 | The SwSmiInputValue field is filled in\r | |
50 | by the software dispatch driver prior to\r | |
51 | invoking this dispatch function.\r | |
52 | The dispatch function will only be called\r | |
53 | for input values for which it is registered.\r | |
54 | \r | |
55 | @return None\r | |
56 | \r | |
57 | **/\r | |
58 | VOID\r | |
59 | EFIAPI\r | |
60 | SmramSaveInfoHandler (\r | |
61 | IN EFI_HANDLE DispatchHandle,\r | |
62 | IN EFI_SMM_SW_DISPATCH_CONTEXT *DispatchContext\r | |
63 | )\r | |
64 | {\r | |
3cbfba02 DW |
65 | ASSERT (DispatchContext != NULL);\r |
66 | ASSERT (DispatchContext->SwSmiInputValue == SMM_FROM_SMBASE_DRIVER);\r | |
67 | \r | |
68 | if (!mLocked && IoRead8 (mSmiDataRegister) == SMM_FROM_CPU_DRIVER_SAVE_INFO) {\r | |
3cbfba02 | 69 | CopyMem (\r |
e0d42561 SL |
70 | (VOID *)(UINTN)(PcdGetEx64 (&gEfiVLVTokenSpaceGuid, PcdCpuLockBoxDataAddress)),\r |
71 | (VOID *)(UINTN)(PcdGetEx64 (&gEfiVLVTokenSpaceGuid, PcdCpuSmramCpuDataAddress)),\r | |
72 | (UINTN)(PcdGetEx64 (&gEfiVLVTokenSpaceGuid, PcdCpuLockBoxSize))\r | |
3cbfba02 | 73 | );\r |
3cbfba02 DW |
74 | }\r |
75 | }\r | |
76 | \r | |
77 | /**\r | |
78 | Smm Ready To Lock event notification handler.\r | |
79 | \r | |
80 | It sets a flag indicating that SMRAM has been locked.\r | |
81 | \r | |
82 | @param[in] Protocol Points to the protocol's unique identifier.\r | |
83 | @param[in] Interface Points to the interface instance.\r | |
84 | @param[in] Handle The handle on which the interface was installed.\r | |
85 | \r | |
86 | @retval EFI_SUCCESS Notification handler runs successfully.\r | |
87 | **/\r | |
88 | EFI_STATUS\r | |
89 | EFIAPI\r | |
90 | SmmReadyToLockEventNotify (\r | |
91 | IN CONST EFI_GUID *Protocol,\r | |
92 | IN VOID *Interface,\r | |
93 | IN EFI_HANDLE Handle\r | |
94 | )\r | |
95 | {\r | |
96 | mLocked = TRUE;\r | |
97 | return EFI_SUCCESS;\r | |
98 | }\r | |
99 | \r | |
100 | /**\r | |
101 | Entry point function of this driver.\r | |
102 | \r | |
103 | @param[in] ImageHandle The firmware allocated handle for the EFI image.\r | |
104 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
105 | \r | |
106 | @retval EFI_SUCCESS The entry point is executed successfully.\r | |
107 | @retval other Some error occurs when executing this entry point.\r | |
108 | **/\r | |
109 | EFI_STATUS\r | |
110 | EFIAPI\r | |
111 | SmramSaveInfoHandlerSmmMain (\r | |
112 | IN EFI_HANDLE ImageHandle,\r | |
113 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
114 | )\r | |
115 | {\r | |
116 | EFI_STATUS Status;\r | |
117 | EFI_SMM_SW_DISPATCH_PROTOCOL *SmmSwDispatch;\r | |
118 | EFI_SMM_SW_DISPATCH_CONTEXT SmmSwDispatchContext;\r | |
119 | EFI_HANDLE DispatchHandle;\r | |
120 | EFI_SMM_CONTROL_PROTOCOL *SmmControl;\r | |
121 | EFI_SMM_CONTROL_REGISTER SmmControlRegister;\r | |
122 | VOID *Registration;\r | |
123 | \r | |
124 | //\r | |
125 | // Get SMI data register\r | |
126 | //\r | |
127 | Status = SystemTable->BootServices->LocateProtocol (\r | |
128 | &gEfiSmmControlProtocolGuid,\r | |
129 | NULL,\r | |
130 | (VOID **)&SmmControl\r | |
131 | );\r | |
132 | ASSERT_EFI_ERROR (Status);\r | |
133 | Status = SmmControl->GetRegisterInfo (SmmControl, &SmmControlRegister);\r | |
134 | ASSERT_EFI_ERROR (Status);\r | |
135 | mSmiDataRegister = SmmControlRegister.SmiDataRegister;\r | |
136 | \r | |
137 | //\r | |
138 | // Register software SMI handler\r | |
139 | //\r | |
140 | \r | |
141 | Status = SystemTable->BootServices->LocateProtocol (\r | |
142 | &gEfiSmmSwDispatchProtocolGuid,\r | |
143 | NULL,\r | |
144 | (VOID **)&SmmSwDispatch\r | |
145 | );\r | |
146 | ASSERT_EFI_ERROR (Status);\r | |
147 | \r | |
148 | SmmSwDispatchContext.SwSmiInputValue = SMM_FROM_SMBASE_DRIVER;\r | |
149 | Status = SmmSwDispatch->Register (\r | |
150 | SmmSwDispatch,\r | |
151 | &SmramSaveInfoHandler,\r | |
152 | &SmmSwDispatchContext,\r | |
153 | &DispatchHandle\r | |
154 | );\r | |
155 | ASSERT_EFI_ERROR (Status);\r | |
156 | \r | |
157 | //\r | |
158 | // Register SMM Ready To Lock Protocol notification\r | |
159 | //\r | |
160 | Status = gSmst->SmmRegisterProtocolNotify (\r | |
161 | &gEfiSmmReadyToLockProtocolGuid,\r | |
162 | SmmReadyToLockEventNotify,\r | |
163 | &Registration\r | |
164 | );\r | |
165 | ASSERT_EFI_ERROR (Status);\r | |
166 | \r | |
167 | return Status;\r | |
168 | }\r | |
169 | \r |