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1 | /** @file\r |
2 | SMM handle & protocol handling.\r | |
3 | \r | |
4 | Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
5 | Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.<BR>\r | |
86094561 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
6b46d772 SV |
7 | \r |
8 | **/\r | |
9 | \r | |
10 | #include "StandaloneMmCore.h"\r | |
11 | \r | |
12 | //\r | |
13 | // mProtocolDatabase - A list of all protocols in the system. (simple list for now)\r | |
14 | // gHandleList - A list of all the handles in the system\r | |
15 | //\r | |
16 | LIST_ENTRY mProtocolDatabase = INITIALIZE_LIST_HEAD_VARIABLE (mProtocolDatabase);\r | |
17 | LIST_ENTRY gHandleList = INITIALIZE_LIST_HEAD_VARIABLE (gHandleList);\r | |
18 | \r | |
19 | /**\r | |
20 | Check whether a handle is a valid EFI_HANDLE\r | |
21 | \r | |
22 | @param UserHandle The handle to check\r | |
23 | \r | |
24 | @retval EFI_INVALID_PARAMETER The handle is NULL or not a valid EFI_HANDLE.\r | |
25 | @retval EFI_SUCCESS The handle is valid EFI_HANDLE.\r | |
26 | \r | |
27 | **/\r | |
28 | EFI_STATUS\r | |
29 | MmValidateHandle (\r | |
30 | IN EFI_HANDLE UserHandle\r | |
31 | )\r | |
32 | {\r | |
33 | IHANDLE *Handle;\r | |
34 | \r | |
35 | Handle = (IHANDLE *)UserHandle;\r | |
36 | if (Handle == NULL) {\r | |
37 | return EFI_INVALID_PARAMETER;\r | |
38 | }\r | |
39 | if (Handle->Signature != EFI_HANDLE_SIGNATURE) {\r | |
40 | return EFI_INVALID_PARAMETER;\r | |
41 | }\r | |
42 | return EFI_SUCCESS;\r | |
43 | }\r | |
44 | \r | |
45 | /**\r | |
46 | Finds the protocol entry for the requested protocol.\r | |
47 | \r | |
48 | @param Protocol The ID of the protocol\r | |
49 | @param Create Create a new entry if not found\r | |
50 | \r | |
51 | @return Protocol entry\r | |
52 | \r | |
53 | **/\r | |
54 | PROTOCOL_ENTRY *\r | |
55 | MmFindProtocolEntry (\r | |
56 | IN EFI_GUID *Protocol,\r | |
57 | IN BOOLEAN Create\r | |
58 | )\r | |
59 | {\r | |
60 | LIST_ENTRY *Link;\r | |
61 | PROTOCOL_ENTRY *Item;\r | |
62 | PROTOCOL_ENTRY *ProtEntry;\r | |
63 | \r | |
64 | //\r | |
65 | // Search the database for the matching GUID\r | |
66 | //\r | |
67 | \r | |
68 | ProtEntry = NULL;\r | |
69 | for (Link = mProtocolDatabase.ForwardLink;\r | |
70 | Link != &mProtocolDatabase;\r | |
71 | Link = Link->ForwardLink) {\r | |
72 | \r | |
73 | Item = CR (Link, PROTOCOL_ENTRY, AllEntries, PROTOCOL_ENTRY_SIGNATURE);\r | |
74 | if (CompareGuid (&Item->ProtocolID, Protocol)) {\r | |
75 | //\r | |
76 | // This is the protocol entry\r | |
77 | //\r | |
78 | ProtEntry = Item;\r | |
79 | break;\r | |
80 | }\r | |
81 | }\r | |
82 | \r | |
83 | //\r | |
84 | // If the protocol entry was not found and Create is TRUE, then\r | |
85 | // allocate a new entry\r | |
86 | //\r | |
87 | if ((ProtEntry == NULL) && Create) {\r | |
88 | ProtEntry = AllocatePool (sizeof(PROTOCOL_ENTRY));\r | |
89 | if (ProtEntry != NULL) {\r | |
90 | //\r | |
91 | // Initialize new protocol entry structure\r | |
92 | //\r | |
93 | ProtEntry->Signature = PROTOCOL_ENTRY_SIGNATURE;\r | |
94 | CopyGuid ((VOID *)&ProtEntry->ProtocolID, Protocol);\r | |
95 | InitializeListHead (&ProtEntry->Protocols);\r | |
96 | InitializeListHead (&ProtEntry->Notify);\r | |
97 | \r | |
98 | //\r | |
99 | // Add it to protocol database\r | |
100 | //\r | |
101 | InsertTailList (&mProtocolDatabase, &ProtEntry->AllEntries);\r | |
102 | }\r | |
103 | }\r | |
104 | return ProtEntry;\r | |
105 | }\r | |
106 | \r | |
107 | /**\r | |
108 | Finds the protocol instance for the requested handle and protocol.\r | |
109 | Note: This function doesn't do parameters checking, it's caller's responsibility\r | |
110 | to pass in valid parameters.\r | |
111 | \r | |
112 | @param Handle The handle to search the protocol on\r | |
113 | @param Protocol GUID of the protocol\r | |
114 | @param Interface The interface for the protocol being searched\r | |
115 | \r | |
116 | @return Protocol instance (NULL: Not found)\r | |
117 | \r | |
118 | **/\r | |
119 | PROTOCOL_INTERFACE *\r | |
120 | MmFindProtocolInterface (\r | |
121 | IN IHANDLE *Handle,\r | |
122 | IN EFI_GUID *Protocol,\r | |
123 | IN VOID *Interface\r | |
124 | )\r | |
125 | {\r | |
126 | PROTOCOL_INTERFACE *Prot;\r | |
127 | PROTOCOL_ENTRY *ProtEntry;\r | |
128 | LIST_ENTRY *Link;\r | |
129 | \r | |
130 | Prot = NULL;\r | |
131 | \r | |
132 | //\r | |
133 | // Lookup the protocol entry for this protocol ID\r | |
134 | //\r | |
135 | ProtEntry = MmFindProtocolEntry (Protocol, FALSE);\r | |
136 | if (ProtEntry != NULL) {\r | |
137 | //\r | |
138 | // Look at each protocol interface for any matches\r | |
139 | //\r | |
140 | for (Link = Handle->Protocols.ForwardLink; Link != &Handle->Protocols; Link=Link->ForwardLink) {\r | |
141 | //\r | |
142 | // If this protocol interface matches, remove it\r | |
143 | //\r | |
144 | Prot = CR (Link, PROTOCOL_INTERFACE, Link, PROTOCOL_INTERFACE_SIGNATURE);\r | |
145 | if (Prot->Interface == Interface && Prot->Protocol == ProtEntry) {\r | |
146 | break;\r | |
147 | }\r | |
148 | Prot = NULL;\r | |
149 | }\r | |
150 | }\r | |
151 | return Prot;\r | |
152 | }\r | |
153 | \r | |
154 | /**\r | |
155 | Wrapper function to MmInstallProtocolInterfaceNotify. This is the public API which\r | |
156 | Calls the private one which contains a BOOLEAN parameter for notifications\r | |
157 | \r | |
158 | @param UserHandle The handle to install the protocol handler on,\r | |
159 | or NULL if a new handle is to be allocated\r | |
160 | @param Protocol The protocol to add to the handle\r | |
161 | @param InterfaceType Indicates whether Interface is supplied in\r | |
162 | native form.\r | |
163 | @param Interface The interface for the protocol being added\r | |
164 | \r | |
165 | @return Status code\r | |
166 | \r | |
167 | **/\r | |
168 | EFI_STATUS\r | |
169 | EFIAPI\r | |
170 | MmInstallProtocolInterface (\r | |
171 | IN OUT EFI_HANDLE *UserHandle,\r | |
172 | IN EFI_GUID *Protocol,\r | |
173 | IN EFI_INTERFACE_TYPE InterfaceType,\r | |
174 | IN VOID *Interface\r | |
175 | )\r | |
176 | {\r | |
177 | return MmInstallProtocolInterfaceNotify (\r | |
178 | UserHandle,\r | |
179 | Protocol,\r | |
180 | InterfaceType,\r | |
181 | Interface,\r | |
182 | TRUE\r | |
183 | );\r | |
184 | }\r | |
185 | \r | |
186 | /**\r | |
187 | Installs a protocol interface into the boot services environment.\r | |
188 | \r | |
189 | @param UserHandle The handle to install the protocol handler on,\r | |
190 | or NULL if a new handle is to be allocated\r | |
191 | @param Protocol The protocol to add to the handle\r | |
192 | @param InterfaceType Indicates whether Interface is supplied in\r | |
193 | native form.\r | |
194 | @param Interface The interface for the protocol being added\r | |
195 | @param Notify indicates whether notify the notification list\r | |
196 | for this protocol\r | |
197 | \r | |
198 | @retval EFI_INVALID_PARAMETER Invalid parameter\r | |
199 | @retval EFI_OUT_OF_RESOURCES No enough buffer to allocate\r | |
200 | @retval EFI_SUCCESS Protocol interface successfully installed\r | |
201 | \r | |
202 | **/\r | |
203 | EFI_STATUS\r | |
204 | MmInstallProtocolInterfaceNotify (\r | |
205 | IN OUT EFI_HANDLE *UserHandle,\r | |
206 | IN EFI_GUID *Protocol,\r | |
207 | IN EFI_INTERFACE_TYPE InterfaceType,\r | |
208 | IN VOID *Interface,\r | |
209 | IN BOOLEAN Notify\r | |
210 | )\r | |
211 | {\r | |
212 | PROTOCOL_INTERFACE *Prot;\r | |
213 | PROTOCOL_ENTRY *ProtEntry;\r | |
214 | IHANDLE *Handle;\r | |
215 | EFI_STATUS Status;\r | |
216 | VOID *ExistingInterface;\r | |
217 | \r | |
218 | //\r | |
219 | // returns EFI_INVALID_PARAMETER if InterfaceType is invalid.\r | |
220 | // Also added check for invalid UserHandle and Protocol pointers.\r | |
221 | //\r | |
222 | if (UserHandle == NULL || Protocol == NULL) {\r | |
223 | return EFI_INVALID_PARAMETER;\r | |
224 | }\r | |
225 | \r | |
226 | if (InterfaceType != EFI_NATIVE_INTERFACE) {\r | |
227 | return EFI_INVALID_PARAMETER;\r | |
228 | }\r | |
229 | \r | |
230 | //\r | |
231 | // Print debug message\r | |
232 | //\r | |
233 | DEBUG ((DEBUG_LOAD | DEBUG_INFO, "MmInstallProtocolInterface: %g %p\n", Protocol, Interface));\r | |
234 | \r | |
235 | Status = EFI_OUT_OF_RESOURCES;\r | |
236 | Prot = NULL;\r | |
237 | Handle = NULL;\r | |
238 | \r | |
239 | if (*UserHandle != NULL) {\r | |
240 | Status = MmHandleProtocol (*UserHandle, Protocol, (VOID **)&ExistingInterface);\r | |
241 | if (!EFI_ERROR (Status)) {\r | |
242 | return EFI_INVALID_PARAMETER;\r | |
243 | }\r | |
244 | }\r | |
245 | \r | |
246 | //\r | |
247 | // Lookup the Protocol Entry for the requested protocol\r | |
248 | //\r | |
249 | ProtEntry = MmFindProtocolEntry (Protocol, TRUE);\r | |
250 | if (ProtEntry == NULL) {\r | |
251 | goto Done;\r | |
252 | }\r | |
253 | \r | |
254 | //\r | |
255 | // Allocate a new protocol interface structure\r | |
256 | //\r | |
257 | Prot = AllocateZeroPool (sizeof (PROTOCOL_INTERFACE));\r | |
258 | if (Prot == NULL) {\r | |
259 | Status = EFI_OUT_OF_RESOURCES;\r | |
260 | goto Done;\r | |
261 | }\r | |
262 | \r | |
263 | //\r | |
264 | // If caller didn't supply a handle, allocate a new one\r | |
265 | //\r | |
266 | Handle = (IHANDLE *)*UserHandle;\r | |
267 | if (Handle == NULL) {\r | |
268 | Handle = AllocateZeroPool (sizeof (IHANDLE));\r | |
269 | if (Handle == NULL) {\r | |
270 | Status = EFI_OUT_OF_RESOURCES;\r | |
271 | goto Done;\r | |
272 | }\r | |
273 | \r | |
274 | //\r | |
275 | // Initialize new handler structure\r | |
276 | //\r | |
277 | Handle->Signature = EFI_HANDLE_SIGNATURE;\r | |
278 | InitializeListHead (&Handle->Protocols);\r | |
279 | \r | |
280 | //\r | |
281 | // Add this handle to the list global list of all handles\r | |
282 | // in the system\r | |
283 | //\r | |
284 | InsertTailList (&gHandleList, &Handle->AllHandles);\r | |
285 | }\r | |
286 | \r | |
287 | Status = MmValidateHandle (Handle);\r | |
288 | if (EFI_ERROR (Status)) {\r | |
289 | goto Done;\r | |
290 | }\r | |
291 | \r | |
292 | //\r | |
293 | // Each interface that is added must be unique\r | |
294 | //\r | |
295 | ASSERT (MmFindProtocolInterface (Handle, Protocol, Interface) == NULL);\r | |
296 | \r | |
297 | //\r | |
298 | // Initialize the protocol interface structure\r | |
299 | //\r | |
300 | Prot->Signature = PROTOCOL_INTERFACE_SIGNATURE;\r | |
301 | Prot->Handle = Handle;\r | |
302 | Prot->Protocol = ProtEntry;\r | |
303 | Prot->Interface = Interface;\r | |
304 | \r | |
305 | //\r | |
306 | // Add this protocol interface to the head of the supported\r | |
307 | // protocol list for this handle\r | |
308 | //\r | |
309 | InsertHeadList (&Handle->Protocols, &Prot->Link);\r | |
310 | \r | |
311 | //\r | |
312 | // Add this protocol interface to the tail of the\r | |
313 | // protocol entry\r | |
314 | //\r | |
315 | InsertTailList (&ProtEntry->Protocols, &Prot->ByProtocol);\r | |
316 | \r | |
317 | //\r | |
318 | // Notify the notification list for this protocol\r | |
319 | //\r | |
320 | if (Notify) {\r | |
321 | MmNotifyProtocol (Prot);\r | |
322 | }\r | |
323 | Status = EFI_SUCCESS;\r | |
324 | \r | |
325 | Done:\r | |
326 | if (!EFI_ERROR (Status)) {\r | |
327 | //\r | |
328 | // Return the new handle back to the caller\r | |
329 | //\r | |
330 | *UserHandle = Handle;\r | |
331 | } else {\r | |
332 | //\r | |
333 | // There was an error, clean up\r | |
334 | //\r | |
335 | if (Prot != NULL) {\r | |
336 | FreePool (Prot);\r | |
337 | }\r | |
338 | }\r | |
339 | return Status;\r | |
340 | }\r | |
341 | \r | |
342 | /**\r | |
343 | Uninstalls all instances of a protocol:interfacer from a handle.\r | |
344 | If the last protocol interface is remove from the handle, the\r | |
345 | handle is freed.\r | |
346 | \r | |
347 | @param UserHandle The handle to remove the protocol handler from\r | |
348 | @param Protocol The protocol, of protocol:interface, to remove\r | |
349 | @param Interface The interface, of protocol:interface, to remove\r | |
350 | \r | |
351 | @retval EFI_INVALID_PARAMETER Protocol is NULL.\r | |
352 | @retval EFI_SUCCESS Protocol interface successfully uninstalled.\r | |
353 | \r | |
354 | **/\r | |
355 | EFI_STATUS\r | |
356 | EFIAPI\r | |
357 | MmUninstallProtocolInterface (\r | |
358 | IN EFI_HANDLE UserHandle,\r | |
359 | IN EFI_GUID *Protocol,\r | |
360 | IN VOID *Interface\r | |
361 | )\r | |
362 | {\r | |
363 | EFI_STATUS Status;\r | |
364 | IHANDLE *Handle;\r | |
365 | PROTOCOL_INTERFACE *Prot;\r | |
366 | \r | |
367 | //\r | |
368 | // Check that Protocol is valid\r | |
369 | //\r | |
370 | if (Protocol == NULL) {\r | |
371 | return EFI_INVALID_PARAMETER;\r | |
372 | }\r | |
373 | \r | |
374 | //\r | |
375 | // Check that UserHandle is a valid handle\r | |
376 | //\r | |
377 | Status = MmValidateHandle (UserHandle);\r | |
378 | if (EFI_ERROR (Status)) {\r | |
379 | return Status;\r | |
380 | }\r | |
381 | \r | |
382 | //\r | |
383 | // Check that Protocol exists on UserHandle, and Interface matches the interface in the database\r | |
384 | //\r | |
385 | Prot = MmFindProtocolInterface (UserHandle, Protocol, Interface);\r | |
386 | if (Prot == NULL) {\r | |
387 | return EFI_NOT_FOUND;\r | |
388 | }\r | |
389 | \r | |
390 | //\r | |
391 | // Remove the protocol interface from the protocol\r | |
392 | //\r | |
393 | Status = EFI_NOT_FOUND;\r | |
394 | Handle = (IHANDLE *)UserHandle;\r | |
395 | Prot = MmRemoveInterfaceFromProtocol (Handle, Protocol, Interface);\r | |
396 | \r | |
397 | if (Prot != NULL) {\r | |
398 | //\r | |
399 | // Remove the protocol interface from the handle\r | |
400 | //\r | |
401 | RemoveEntryList (&Prot->Link);\r | |
402 | \r | |
403 | //\r | |
404 | // Free the memory\r | |
405 | //\r | |
406 | Prot->Signature = 0;\r | |
407 | FreePool (Prot);\r | |
408 | Status = EFI_SUCCESS;\r | |
409 | }\r | |
410 | \r | |
411 | //\r | |
412 | // If there are no more handlers for the handle, free the handle\r | |
413 | //\r | |
414 | if (IsListEmpty (&Handle->Protocols)) {\r | |
415 | Handle->Signature = 0;\r | |
416 | RemoveEntryList (&Handle->AllHandles);\r | |
417 | FreePool (Handle);\r | |
418 | }\r | |
419 | return Status;\r | |
420 | }\r | |
421 | \r | |
422 | /**\r | |
423 | Locate a certain GUID protocol interface in a Handle's protocols.\r | |
424 | \r | |
425 | @param UserHandle The handle to obtain the protocol interface on\r | |
426 | @param Protocol The GUID of the protocol\r | |
427 | \r | |
428 | @return The requested protocol interface for the handle\r | |
429 | \r | |
430 | **/\r | |
431 | PROTOCOL_INTERFACE *\r | |
432 | MmGetProtocolInterface (\r | |
433 | IN EFI_HANDLE UserHandle,\r | |
434 | IN EFI_GUID *Protocol\r | |
435 | )\r | |
436 | {\r | |
437 | EFI_STATUS Status;\r | |
438 | PROTOCOL_ENTRY *ProtEntry;\r | |
439 | PROTOCOL_INTERFACE *Prot;\r | |
440 | IHANDLE *Handle;\r | |
441 | LIST_ENTRY *Link;\r | |
442 | \r | |
443 | Status = MmValidateHandle (UserHandle);\r | |
444 | if (EFI_ERROR (Status)) {\r | |
445 | return NULL;\r | |
446 | }\r | |
447 | \r | |
448 | Handle = (IHANDLE *)UserHandle;\r | |
449 | \r | |
450 | //\r | |
451 | // Look at each protocol interface for a match\r | |
452 | //\r | |
453 | for (Link = Handle->Protocols.ForwardLink; Link != &Handle->Protocols; Link = Link->ForwardLink) {\r | |
454 | Prot = CR (Link, PROTOCOL_INTERFACE, Link, PROTOCOL_INTERFACE_SIGNATURE);\r | |
455 | ProtEntry = Prot->Protocol;\r | |
456 | if (CompareGuid (&ProtEntry->ProtocolID, Protocol)) {\r | |
457 | return Prot;\r | |
458 | }\r | |
459 | }\r | |
460 | return NULL;\r | |
461 | }\r | |
462 | \r | |
463 | /**\r | |
464 | Queries a handle to determine if it supports a specified protocol.\r | |
465 | \r | |
466 | @param UserHandle The handle being queried.\r | |
467 | @param Protocol The published unique identifier of the protocol.\r | |
468 | @param Interface Supplies the address where a pointer to the\r | |
469 | corresponding Protocol Interface is returned.\r | |
470 | \r | |
471 | @retval EFI_SUCCESS The interface information for the specified protocol was returned.\r | |
472 | @retval EFI_UNSUPPORTED The device does not support the specified protocol.\r | |
473 | @retval EFI_INVALID_PARAMETER Handle is not a valid EFI_HANDLE..\r | |
474 | @retval EFI_INVALID_PARAMETER Protocol is NULL.\r | |
475 | @retval EFI_INVALID_PARAMETER Interface is NULL.\r | |
476 | \r | |
477 | **/\r | |
478 | EFI_STATUS\r | |
479 | EFIAPI\r | |
480 | MmHandleProtocol (\r | |
481 | IN EFI_HANDLE UserHandle,\r | |
482 | IN EFI_GUID *Protocol,\r | |
483 | OUT VOID **Interface\r | |
484 | )\r | |
485 | {\r | |
486 | EFI_STATUS Status;\r | |
487 | PROTOCOL_INTERFACE *Prot;\r | |
488 | \r | |
489 | //\r | |
490 | // Check for invalid Protocol\r | |
491 | //\r | |
492 | if (Protocol == NULL) {\r | |
493 | return EFI_INVALID_PARAMETER;\r | |
494 | }\r | |
495 | \r | |
496 | //\r | |
497 | // Check for invalid Interface\r | |
498 | //\r | |
499 | if (Interface == NULL) {\r | |
500 | return EFI_INVALID_PARAMETER;\r | |
501 | } else {\r | |
502 | *Interface = NULL;\r | |
503 | }\r | |
504 | \r | |
505 | //\r | |
506 | // Check for invalid UserHandle\r | |
507 | //\r | |
508 | Status = MmValidateHandle (UserHandle);\r | |
509 | if (EFI_ERROR (Status)) {\r | |
510 | return Status;\r | |
511 | }\r | |
512 | \r | |
513 | //\r | |
514 | // Look at each protocol interface for a match\r | |
515 | //\r | |
516 | Prot = MmGetProtocolInterface (UserHandle, Protocol);\r | |
517 | if (Prot == NULL) {\r | |
518 | return EFI_UNSUPPORTED;\r | |
519 | }\r | |
520 | \r | |
521 | //\r | |
522 | // This is the protocol interface entry for this protocol\r | |
523 | //\r | |
524 | *Interface = Prot->Interface;\r | |
525 | \r | |
526 | return EFI_SUCCESS;\r | |
527 | }\r |