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e42e9404 | 1 | /** @file\r |
2 | SMI management.\r | |
3 | \r | |
8a641d2b | 4 | Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r |
9d510e61 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
e42e9404 | 6 | \r |
7 | **/\r | |
8 | \r | |
9 | #include "PiSmmCore.h"\r | |
10 | \r | |
e42e9404 | 11 | LIST_ENTRY mSmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mSmiEntryList);\r |
12 | \r | |
ca41f3f4 JY |
13 | SMI_ENTRY mRootSmiEntry = {\r |
14 | SMI_ENTRY_SIGNATURE,\r | |
15 | INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiEntry.AllEntries),\r | |
16 | {0},\r | |
17 | INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiEntry.SmiHandlers),\r | |
18 | };\r | |
19 | \r | |
e42e9404 | 20 | /**\r |
21 | Finds the SMI entry for the requested handler type.\r | |
22 | \r | |
23 | @param HandlerType The type of the interrupt\r | |
24 | @param Create Create a new entry if not found\r | |
25 | \r | |
26 | @return SMI entry\r | |
27 | \r | |
28 | **/\r | |
29 | SMI_ENTRY *\r | |
30 | EFIAPI\r | |
31 | SmmCoreFindSmiEntry (\r | |
32 | IN EFI_GUID *HandlerType,\r | |
33 | IN BOOLEAN Create\r | |
34 | )\r | |
35 | {\r | |
36 | LIST_ENTRY *Link;\r | |
37 | SMI_ENTRY *Item;\r | |
38 | SMI_ENTRY *SmiEntry;\r | |
39 | \r | |
40 | //\r | |
41 | // Search the SMI entry list for the matching GUID\r | |
42 | //\r | |
43 | SmiEntry = NULL;\r | |
44 | for (Link = mSmiEntryList.ForwardLink;\r | |
45 | Link != &mSmiEntryList;\r | |
46 | Link = Link->ForwardLink) {\r | |
47 | \r | |
48 | Item = CR (Link, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);\r | |
49 | if (CompareGuid (&Item->HandlerType, HandlerType)) {\r | |
50 | //\r | |
51 | // This is the SMI entry\r | |
52 | //\r | |
53 | SmiEntry = Item;\r | |
54 | break;\r | |
55 | }\r | |
56 | }\r | |
57 | \r | |
58 | //\r | |
59 | // If the protocol entry was not found and Create is TRUE, then\r | |
60 | // allocate a new entry\r | |
61 | //\r | |
62 | if ((SmiEntry == NULL) && Create) {\r | |
63 | SmiEntry = AllocatePool (sizeof(SMI_ENTRY));\r | |
64 | if (SmiEntry != NULL) {\r | |
65 | //\r | |
66 | // Initialize new SMI entry structure\r | |
67 | //\r | |
68 | SmiEntry->Signature = SMI_ENTRY_SIGNATURE;\r | |
69 | CopyGuid ((VOID *)&SmiEntry->HandlerType, HandlerType);\r | |
70 | InitializeListHead (&SmiEntry->SmiHandlers);\r | |
71 | \r | |
72 | //\r | |
73 | // Add it to SMI entry list\r | |
74 | //\r | |
75 | InsertTailList (&mSmiEntryList, &SmiEntry->AllEntries);\r | |
76 | }\r | |
77 | }\r | |
78 | return SmiEntry;\r | |
79 | }\r | |
80 | \r | |
81 | /**\r | |
82 | Manage SMI of a particular type.\r | |
83 | \r | |
84 | @param HandlerType Points to the handler type or NULL for root SMI handlers.\r | |
85 | @param Context Points to an optional context buffer.\r | |
86 | @param CommBuffer Points to the optional communication buffer.\r | |
87 | @param CommBufferSize Points to the size of the optional communication buffer.\r | |
88 | \r | |
d5b339a9 | 89 | @retval EFI_WARN_INTERRUPT_SOURCE_PENDING Interrupt source was processed successfully but not quiesced.\r |
e42e9404 | 90 | @retval EFI_INTERRUPT_PENDING One or more SMI sources could not be quiesced.\r |
d5b339a9 | 91 | @retval EFI_NOT_FOUND Interrupt source was not handled or quiesced.\r |
92 | @retval EFI_SUCCESS Interrupt source was handled and quiesced.\r | |
e42e9404 | 93 | \r |
94 | **/\r | |
95 | EFI_STATUS\r | |
96 | EFIAPI\r | |
97 | SmiManage (\r | |
98 | IN CONST EFI_GUID *HandlerType,\r | |
99 | IN CONST VOID *Context OPTIONAL,\r | |
100 | IN OUT VOID *CommBuffer OPTIONAL,\r | |
101 | IN OUT UINTN *CommBufferSize OPTIONAL\r | |
102 | )\r | |
103 | {\r | |
104 | LIST_ENTRY *Link;\r | |
105 | LIST_ENTRY *Head;\r | |
106 | SMI_ENTRY *SmiEntry;\r | |
107 | SMI_HANDLER *SmiHandler;\r | |
510ed431 | 108 | BOOLEAN SuccessReturn;\r |
e42e9404 | 109 | EFI_STATUS Status;\r |
d1102dba | 110 | \r |
d5b339a9 | 111 | Status = EFI_NOT_FOUND;\r |
510ed431 | 112 | SuccessReturn = FALSE;\r |
e42e9404 | 113 | if (HandlerType == NULL) {\r |
114 | //\r | |
115 | // Root SMI handler\r | |
116 | //\r | |
ca41f3f4 | 117 | SmiEntry = &mRootSmiEntry;\r |
d5b339a9 | 118 | } else {\r |
e42e9404 | 119 | //\r |
d5b339a9 | 120 | // Non-root SMI handler\r |
e42e9404 | 121 | //\r |
d5b339a9 | 122 | SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, FALSE);\r |
123 | if (SmiEntry == NULL) {\r | |
124 | //\r | |
125 | // There is no handler registered for this interrupt source\r | |
126 | //\r | |
127 | return Status;\r | |
128 | }\r | |
e42e9404 | 129 | }\r |
ca41f3f4 | 130 | Head = &SmiEntry->SmiHandlers;\r |
e42e9404 | 131 | \r |
e42e9404 | 132 | for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r |
133 | SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r | |
134 | \r | |
135 | Status = SmiHandler->Handler (\r | |
136 | (EFI_HANDLE) SmiHandler,\r | |
137 | Context,\r | |
138 | CommBuffer,\r | |
139 | CommBufferSize\r | |
140 | );\r | |
141 | \r | |
142 | switch (Status) {\r | |
143 | case EFI_INTERRUPT_PENDING:\r | |
144 | //\r | |
510ed431 | 145 | // If a handler returns EFI_INTERRUPT_PENDING and HandlerType is not NULL then\r |
146 | // no additional handlers will be processed and EFI_INTERRUPT_PENDING will be returned.\r | |
e42e9404 | 147 | //\r |
6b52b72f | 148 | if (HandlerType != NULL) {\r |
149 | return EFI_INTERRUPT_PENDING;\r | |
150 | }\r | |
151 | break;\r | |
e42e9404 | 152 | \r |
153 | case EFI_SUCCESS:\r | |
154 | //\r | |
510ed431 | 155 | // If at least one of the handlers returns EFI_SUCCESS then the function will return\r |
156 | // EFI_SUCCESS. If a handler returns EFI_SUCCESS and HandlerType is not NULL then no\r | |
157 | // additional handlers will be processed.\r | |
e42e9404 | 158 | //\r |
6b52b72f | 159 | if (HandlerType != NULL) {\r |
160 | return EFI_SUCCESS;\r | |
161 | }\r | |
510ed431 | 162 | SuccessReturn = TRUE;\r |
6b52b72f | 163 | break;\r |
e42e9404 | 164 | \r |
165 | case EFI_WARN_INTERRUPT_SOURCE_QUIESCED:\r | |
166 | //\r | |
d5b339a9 | 167 | // If at least one of the handlers returns EFI_WARN_INTERRUPT_SOURCE_QUIESCED\r |
d1102dba | 168 | // then the function will return EFI_SUCCESS.\r |
e42e9404 | 169 | //\r |
510ed431 | 170 | SuccessReturn = TRUE;\r |
e42e9404 | 171 | break;\r |
172 | \r | |
d5b339a9 | 173 | case EFI_WARN_INTERRUPT_SOURCE_PENDING:\r |
174 | //\r | |
175 | // If all the handlers returned EFI_WARN_INTERRUPT_SOURCE_PENDING\r | |
176 | // then EFI_WARN_INTERRUPT_SOURCE_PENDING will be returned.\r | |
177 | //\r | |
178 | break;\r | |
179 | \r | |
e42e9404 | 180 | default:\r |
d5b339a9 | 181 | //\r |
182 | // Unexpected status code returned.\r | |
183 | //\r | |
184 | ASSERT (FALSE);\r | |
e42e9404 | 185 | break;\r |
186 | }\r | |
187 | }\r | |
188 | \r | |
510ed431 | 189 | if (SuccessReturn) {\r |
d5b339a9 | 190 | Status = EFI_SUCCESS;\r |
e42e9404 | 191 | }\r |
d5b339a9 | 192 | \r |
e42e9404 | 193 | return Status;\r |
194 | }\r | |
195 | \r | |
196 | /**\r | |
197 | Registers a handler to execute within SMM.\r | |
198 | \r | |
199 | @param Handler Handler service funtion pointer.\r | |
200 | @param HandlerType Points to the handler type or NULL for root SMI handlers.\r | |
201 | @param DispatchHandle On return, contains a unique handle which can be used to later unregister the handler function.\r | |
202 | \r | |
203 | @retval EFI_SUCCESS Handler register success.\r | |
204 | @retval EFI_INVALID_PARAMETER Handler or DispatchHandle is NULL.\r | |
205 | \r | |
206 | **/\r | |
207 | EFI_STATUS\r | |
208 | EFIAPI\r | |
209 | SmiHandlerRegister (\r | |
210 | IN EFI_SMM_HANDLER_ENTRY_POINT2 Handler,\r | |
211 | IN CONST EFI_GUID *HandlerType OPTIONAL,\r | |
212 | OUT EFI_HANDLE *DispatchHandle\r | |
213 | )\r | |
214 | {\r | |
215 | SMI_HANDLER *SmiHandler;\r | |
216 | SMI_ENTRY *SmiEntry;\r | |
217 | LIST_ENTRY *List;\r | |
218 | \r | |
219 | if (Handler == NULL || DispatchHandle == NULL) {\r | |
220 | return EFI_INVALID_PARAMETER;\r | |
221 | }\r | |
222 | \r | |
223 | SmiHandler = AllocateZeroPool (sizeof (SMI_HANDLER));\r | |
224 | if (SmiHandler == NULL) {\r | |
225 | return EFI_OUT_OF_RESOURCES;\r | |
226 | }\r | |
227 | \r | |
228 | SmiHandler->Signature = SMI_HANDLER_SIGNATURE;\r | |
229 | SmiHandler->Handler = Handler;\r | |
ca41f3f4 | 230 | SmiHandler->CallerAddr = (UINTN)RETURN_ADDRESS (0);\r |
e42e9404 | 231 | \r |
232 | if (HandlerType == NULL) {\r | |
233 | //\r | |
234 | // This is root SMI handler\r | |
235 | //\r | |
ca41f3f4 | 236 | SmiEntry = &mRootSmiEntry;\r |
e42e9404 | 237 | } else {\r |
238 | //\r | |
239 | // None root SMI handler\r | |
240 | //\r | |
241 | SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, TRUE);\r | |
242 | if (SmiEntry == NULL) {\r | |
243 | return EFI_OUT_OF_RESOURCES;\r | |
244 | }\r | |
e42e9404 | 245 | }\r |
ca41f3f4 | 246 | List = &SmiEntry->SmiHandlers;\r |
e42e9404 | 247 | \r |
248 | SmiHandler->SmiEntry = SmiEntry;\r | |
249 | InsertTailList (List, &SmiHandler->Link);\r | |
250 | \r | |
251 | *DispatchHandle = (EFI_HANDLE) SmiHandler;\r | |
252 | \r | |
253 | return EFI_SUCCESS;\r | |
254 | }\r | |
255 | \r | |
256 | /**\r | |
257 | Unregister a handler in SMM.\r | |
258 | \r | |
259 | @param DispatchHandle The handle that was specified when the handler was registered.\r | |
260 | \r | |
261 | @retval EFI_SUCCESS Handler function was successfully unregistered.\r | |
262 | @retval EFI_INVALID_PARAMETER DispatchHandle does not refer to a valid handle.\r | |
263 | \r | |
264 | **/\r | |
265 | EFI_STATUS\r | |
266 | EFIAPI\r | |
267 | SmiHandlerUnRegister (\r | |
268 | IN EFI_HANDLE DispatchHandle\r | |
269 | )\r | |
270 | {\r | |
271 | SMI_HANDLER *SmiHandler;\r | |
272 | SMI_ENTRY *SmiEntry;\r | |
8a641d2b RN |
273 | LIST_ENTRY *EntryLink;\r |
274 | LIST_ENTRY *HandlerLink;\r | |
e42e9404 | 275 | \r |
8a641d2b | 276 | if (DispatchHandle == NULL) {\r |
e42e9404 | 277 | return EFI_INVALID_PARAMETER;\r |
278 | }\r | |
279 | \r | |
8a641d2b RN |
280 | //\r |
281 | // Look for it in root SMI handlers\r | |
282 | //\r | |
283 | SmiHandler = NULL;\r | |
284 | for ( HandlerLink = GetFirstNode (&mRootSmiEntry.SmiHandlers)\r | |
f662f91c | 285 | ; !IsNull (&mRootSmiEntry.SmiHandlers, HandlerLink) && ((EFI_HANDLE) SmiHandler != DispatchHandle)\r |
8a641d2b RN |
286 | ; HandlerLink = GetNextNode (&mRootSmiEntry.SmiHandlers, HandlerLink)\r |
287 | ) {\r | |
288 | SmiHandler = CR (HandlerLink, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r | |
289 | }\r | |
290 | \r | |
291 | //\r | |
292 | // Look for it in non-root SMI handlers\r | |
293 | //\r | |
294 | for ( EntryLink = GetFirstNode (&mSmiEntryList)\r | |
f662f91c | 295 | ; !IsNull (&mSmiEntryList, EntryLink) && ((EFI_HANDLE) SmiHandler != DispatchHandle)\r |
8a641d2b RN |
296 | ; EntryLink = GetNextNode (&mSmiEntryList, EntryLink)\r |
297 | ) {\r | |
298 | SmiEntry = CR (EntryLink, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);\r | |
299 | for ( HandlerLink = GetFirstNode (&SmiEntry->SmiHandlers)\r | |
f662f91c | 300 | ; !IsNull (&SmiEntry->SmiHandlers, HandlerLink) && ((EFI_HANDLE) SmiHandler != DispatchHandle)\r |
8a641d2b RN |
301 | ; HandlerLink = GetNextNode (&SmiEntry->SmiHandlers, HandlerLink)\r |
302 | ) {\r | |
303 | SmiHandler = CR (HandlerLink, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r | |
304 | }\r | |
305 | }\r | |
306 | \r | |
f662f91c | 307 | if ((EFI_HANDLE) SmiHandler != DispatchHandle) {\r |
e42e9404 | 308 | return EFI_INVALID_PARAMETER;\r |
309 | }\r | |
310 | \r | |
311 | SmiEntry = SmiHandler->SmiEntry;\r | |
312 | \r | |
313 | RemoveEntryList (&SmiHandler->Link);\r | |
314 | FreePool (SmiHandler);\r | |
315 | \r | |
316 | if (SmiEntry == NULL) {\r | |
317 | //\r | |
318 | // This is root SMI handler\r | |
319 | //\r | |
320 | return EFI_SUCCESS;\r | |
321 | }\r | |
322 | \r | |
323 | if (IsListEmpty (&SmiEntry->SmiHandlers)) {\r | |
324 | //\r | |
325 | // No handler registered for this interrupt now, remove the SMI_ENTRY\r | |
326 | //\r | |
327 | RemoveEntryList (&SmiEntry->AllEntries);\r | |
328 | \r | |
329 | FreePool (SmiEntry);\r | |
330 | }\r | |
331 | \r | |
332 | return EFI_SUCCESS;\r | |
333 | }\r |