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1 /** @file
2 SMM Core Main Entry Point
3
4 Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials are licensed and made available
6 under the terms and conditions of the BSD License which accompanies this
7 distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15 #include "PiSmmCore.h"
16
17 //
18 // Physical pointer to private structure shared between SMM IPL and the SMM Core
19 //
20 SMM_CORE_PRIVATE_DATA *gSmmCorePrivate;
21
22 //
23 // SMM Core global variable for SMM System Table. Only accessed as a physical structure in SMRAM.
24 //
25 EFI_SMM_SYSTEM_TABLE2 gSmmCoreSmst = {
26 {
27 SMM_SMST_SIGNATURE,
28 EFI_SMM_SYSTEM_TABLE2_REVISION,
29 sizeof (gSmmCoreSmst.Hdr)
30 },
31 NULL, // SmmFirmwareVendor
32 0, // SmmFirmwareRevision
33 SmmInstallConfigurationTable,
34 {
35 {
36 (EFI_SMM_CPU_IO2) SmmEfiNotAvailableYetArg5, // SmmMemRead
37 (EFI_SMM_CPU_IO2) SmmEfiNotAvailableYetArg5 // SmmMemWrite
38 },
39 {
40 (EFI_SMM_CPU_IO2) SmmEfiNotAvailableYetArg5, // SmmIoRead
41 (EFI_SMM_CPU_IO2) SmmEfiNotAvailableYetArg5 // SmmIoWrite
42 }
43 },
44 SmmAllocatePool,
45 SmmFreePool,
46 SmmAllocatePages,
47 SmmFreePages,
48 NULL, // SmmStartupThisAp
49 0, // CurrentlyExecutingCpu
50 0, // NumberOfCpus
51 NULL, // CpuSaveStateSize
52 NULL, // CpuSaveState
53 0, // NumberOfTableEntries
54 NULL, // SmmConfigurationTable
55 SmmInstallProtocolInterface,
56 SmmUninstallProtocolInterface,
57 SmmHandleProtocol,
58 SmmRegisterProtocolNotify,
59 SmmLocateHandle,
60 SmmLocateProtocol,
61 SmiManage,
62 SmiHandlerRegister,
63 SmiHandlerUnRegister
64 };
65
66 //
67 // Flag to determine if the platform has performed a legacy boot.
68 // If this flag is TRUE, then the runtime code and runtime data associated with the
69 // SMM IPL are converted to free memory, so the SMM Core must guarantee that is
70 // does not touch of the code/data associated with the SMM IPL if this flag is TRUE.
71 //
72 BOOLEAN mInLegacyBoot = FALSE;
73
74 //
75 // Table of SMI Handlers that are registered by the SMM Core when it is initialized
76 //
77 SMM_CORE_SMI_HANDLERS mSmmCoreSmiHandlers[] = {
78 { SmmDriverDispatchHandler, &gEfiEventDxeDispatchGuid, NULL, TRUE },
79 { SmmReadyToLockHandler, &gEfiDxeSmmReadyToLockProtocolGuid, NULL, TRUE },
80 { SmmLegacyBootHandler, &gEfiEventLegacyBootGuid, NULL, FALSE },
81 { SmmExitBootServicesHandler, &gEfiEventExitBootServicesGuid, NULL, FALSE },
82 { SmmReadyToBootHandler, &gEfiEventReadyToBootGuid, NULL, FALSE },
83 { SmmEndOfDxeHandler, &gEfiEndOfDxeEventGroupGuid, NULL, TRUE },
84 { NULL, NULL, NULL, FALSE }
85 };
86
87 UINTN mFullSmramRangeCount;
88 EFI_SMRAM_DESCRIPTOR *mFullSmramRanges;
89
90 EFI_LOADED_IMAGE_PROTOCOL *mSmmCoreLoadedImage;
91
92 /**
93 Place holder function until all the SMM System Table Service are available.
94
95 Note: This function is only used by SMRAM invocation. It is never used by DXE invocation.
96
97 @param Arg1 Undefined
98 @param Arg2 Undefined
99 @param Arg3 Undefined
100 @param Arg4 Undefined
101 @param Arg5 Undefined
102
103 @return EFI_NOT_AVAILABLE_YET
104
105 **/
106 EFI_STATUS
107 EFIAPI
108 SmmEfiNotAvailableYetArg5 (
109 UINTN Arg1,
110 UINTN Arg2,
111 UINTN Arg3,
112 UINTN Arg4,
113 UINTN Arg5
114 )
115 {
116 //
117 // This function should never be executed. If it does, then the architectural protocols
118 // have not been designed correctly.
119 //
120 return EFI_NOT_AVAILABLE_YET;
121 }
122
123 /**
124 Software SMI handler that is called when a Legacy Boot event is signalled. The SMM
125 Core uses this signal to know that a Legacy Boot has been performed and that
126 gSmmCorePrivate that is shared between the UEFI and SMM execution environments can
127 not be accessed from SMM anymore since that structure is considered free memory by
128 a legacy OS. Then the SMM Core also install SMM Legacy Boot protocol to notify SMM
129 driver that system enter legacy boot.
130
131 @param DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
132 @param Context Points to an optional handler context which was specified when the handler was registered.
133 @param CommBuffer A pointer to a collection of data in memory that will
134 be conveyed from a non-SMM environment into an SMM environment.
135 @param CommBufferSize The size of the CommBuffer.
136
137 @return Status Code
138
139 **/
140 EFI_STATUS
141 EFIAPI
142 SmmLegacyBootHandler (
143 IN EFI_HANDLE DispatchHandle,
144 IN CONST VOID *Context, OPTIONAL
145 IN OUT VOID *CommBuffer, OPTIONAL
146 IN OUT UINTN *CommBufferSize OPTIONAL
147 )
148 {
149 EFI_STATUS Status;
150 EFI_HANDLE SmmHandle;
151
152 //
153 // Install SMM Legacy Boot protocol.
154 //
155 SmmHandle = NULL;
156 Status = SmmInstallProtocolInterface (
157 &SmmHandle,
158 &gEdkiiSmmLegacyBootProtocolGuid,
159 EFI_NATIVE_INTERFACE,
160 NULL
161 );
162
163 mInLegacyBoot = TRUE;
164
165 SmiHandlerUnRegister (DispatchHandle);
166
167 return Status;
168 }
169
170 /**
171 Software SMI handler that is called when an Exit Boot Services event is signalled.
172 Then the SMM Core also install SMM Exit Boot Services protocol to notify SMM driver
173 that system enter exit boot services.
174
175 @param DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
176 @param Context Points to an optional handler context which was specified when the handler was registered.
177 @param CommBuffer A pointer to a collection of data in memory that will
178 be conveyed from a non-SMM environment into an SMM environment.
179 @param CommBufferSize The size of the CommBuffer.
180
181 @return Status Code
182
183 **/
184 EFI_STATUS
185 EFIAPI
186 SmmExitBootServicesHandler (
187 IN EFI_HANDLE DispatchHandle,
188 IN CONST VOID *Context, OPTIONAL
189 IN OUT VOID *CommBuffer, OPTIONAL
190 IN OUT UINTN *CommBufferSize OPTIONAL
191 )
192 {
193 EFI_STATUS Status;
194 EFI_HANDLE SmmHandle;
195
196 //
197 // Install SMM Exit Boot Services protocol.
198 //
199 SmmHandle = NULL;
200 Status = SmmInstallProtocolInterface (
201 &SmmHandle,
202 &gEdkiiSmmExitBootServicesProtocolGuid,
203 EFI_NATIVE_INTERFACE,
204 NULL
205 );
206
207 SmiHandlerUnRegister (DispatchHandle);
208
209 return Status;
210 }
211
212 /**
213 Software SMI handler that is called when an Ready To Boot event is signalled.
214 Then the SMM Core also install SMM Ready To Boot protocol to notify SMM driver
215 that system enter ready to boot.
216
217 @param DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
218 @param Context Points to an optional handler context which was specified when the handler was registered.
219 @param CommBuffer A pointer to a collection of data in memory that will
220 be conveyed from a non-SMM environment into an SMM environment.
221 @param CommBufferSize The size of the CommBuffer.
222
223 @return Status Code
224
225 **/
226 EFI_STATUS
227 EFIAPI
228 SmmReadyToBootHandler (
229 IN EFI_HANDLE DispatchHandle,
230 IN CONST VOID *Context, OPTIONAL
231 IN OUT VOID *CommBuffer, OPTIONAL
232 IN OUT UINTN *CommBufferSize OPTIONAL
233 )
234 {
235 EFI_STATUS Status;
236 EFI_HANDLE SmmHandle;
237
238 //
239 // Install SMM Ready To Boot protocol.
240 //
241 SmmHandle = NULL;
242 Status = SmmInstallProtocolInterface (
243 &SmmHandle,
244 &gEdkiiSmmReadyToBootProtocolGuid,
245 EFI_NATIVE_INTERFACE,
246 NULL
247 );
248
249 SmiHandlerUnRegister (DispatchHandle);
250
251 return Status;
252 }
253
254 /**
255 Software SMI handler that is called when the DxeSmmReadyToLock protocol is added
256 or if gEfiEventReadyToBootGuid is signalled. This function unregisters the
257 Software SMIs that are nor required after SMRAM is locked and installs the
258 SMM Ready To Lock Protocol so SMM Drivers are informed that SMRAM is about
259 to be locked. It also verifies the SMM CPU I/O 2 Protocol has been installed
260 and NULLs gBS and gST because they can not longer be used after SMRAM is locked.
261
262 @param DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
263 @param Context Points to an optional handler context which was specified when the handler was registered.
264 @param CommBuffer A pointer to a collection of data in memory that will
265 be conveyed from a non-SMM environment into an SMM environment.
266 @param CommBufferSize The size of the CommBuffer.
267
268 @return Status Code
269
270 **/
271 EFI_STATUS
272 EFIAPI
273 SmmReadyToLockHandler (
274 IN EFI_HANDLE DispatchHandle,
275 IN CONST VOID *Context, OPTIONAL
276 IN OUT VOID *CommBuffer, OPTIONAL
277 IN OUT UINTN *CommBufferSize OPTIONAL
278 )
279 {
280 EFI_STATUS Status;
281 UINTN Index;
282 EFI_HANDLE SmmHandle;
283 VOID *Interface;
284
285 //
286 // Unregister SMI Handlers that are no required after the SMM driver dispatch is stopped
287 //
288 for (Index = 0; mSmmCoreSmiHandlers[Index].HandlerType != NULL; Index++) {
289 if (mSmmCoreSmiHandlers[Index].UnRegister) {
290 SmiHandlerUnRegister (mSmmCoreSmiHandlers[Index].DispatchHandle);
291 }
292 }
293
294 //
295 // Install SMM Ready to lock protocol
296 //
297 SmmHandle = NULL;
298 Status = SmmInstallProtocolInterface (
299 &SmmHandle,
300 &gEfiSmmReadyToLockProtocolGuid,
301 EFI_NATIVE_INTERFACE,
302 NULL
303 );
304
305 //
306 // Make sure SMM CPU I/O 2 Procol has been installed into the handle database
307 //
308 Status = SmmLocateProtocol (&gEfiSmmCpuIo2ProtocolGuid, NULL, &Interface);
309
310 //
311 // Print a message on a debug build if the SMM CPU I/O 2 Protocol is not installed
312 //
313 DEBUG_CODE_BEGIN ();
314 if (EFI_ERROR (Status)) {
315 DEBUG ((DEBUG_ERROR, "\nSMM: SmmCpuIo Arch Protocol not present!!\n"));
316 }
317 DEBUG_CODE_END ();
318
319 //
320 // Assert if the CPU I/O 2 Protocol is not installed
321 //
322 ASSERT_EFI_ERROR (Status);
323
324 //
325 // Display any drivers that were not dispatched because dependency expression
326 // evaluated to false if this is a debug build
327 //
328 DEBUG_CODE_BEGIN ();
329 SmmDisplayDiscoveredNotDispatched ();
330 DEBUG_CODE_END ();
331
332 //
333 // Not allowed to use gST or gBS after lock
334 //
335 gST = NULL;
336 gBS = NULL;
337
338 SmramProfileReadyToLock ();
339
340 return Status;
341 }
342
343 /**
344 Software SMI handler that is called when the EndOfDxe event is signalled.
345 This function installs the SMM EndOfDxe Protocol so SMM Drivers are informed that
346 platform code will invoke 3rd part code.
347
348 @param DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
349 @param Context Points to an optional handler context which was specified when the handler was registered.
350 @param CommBuffer A pointer to a collection of data in memory that will
351 be conveyed from a non-SMM environment into an SMM environment.
352 @param CommBufferSize The size of the CommBuffer.
353
354 @return Status Code
355
356 **/
357 EFI_STATUS
358 EFIAPI
359 SmmEndOfDxeHandler (
360 IN EFI_HANDLE DispatchHandle,
361 IN CONST VOID *Context, OPTIONAL
362 IN OUT VOID *CommBuffer, OPTIONAL
363 IN OUT UINTN *CommBufferSize OPTIONAL
364 )
365 {
366 EFI_STATUS Status;
367 EFI_HANDLE SmmHandle;
368
369 DEBUG ((EFI_D_INFO, "SmmEndOfDxeHandler\n"));
370 //
371 // Install SMM EndOfDxe protocol
372 //
373 SmmHandle = NULL;
374 Status = SmmInstallProtocolInterface (
375 &SmmHandle,
376 &gEfiSmmEndOfDxeProtocolGuid,
377 EFI_NATIVE_INTERFACE,
378 NULL
379 );
380 return Status;
381 }
382
383 /**
384 Determine if two buffers overlap in memory.
385
386 @param[in] Buff1 Pointer to first buffer
387 @param[in] Size1 Size of Buff1
388 @param[in] Buff2 Pointer to second buffer
389 @param[in] Size2 Size of Buff2
390
391 @retval TRUE Buffers overlap in memory.
392 @retval FALSE Buffer doesn't overlap.
393
394 **/
395 BOOLEAN
396 InternalIsBufferOverlapped (
397 IN UINT8 *Buff1,
398 IN UINTN Size1,
399 IN UINT8 *Buff2,
400 IN UINTN Size2
401 )
402 {
403 //
404 // If buff1's end is less than the start of buff2, then it's ok.
405 // Also, if buff1's start is beyond buff2's end, then it's ok.
406 //
407 if (((Buff1 + Size1) <= Buff2) || (Buff1 >= (Buff2 + Size2))) {
408 return FALSE;
409 }
410
411 return TRUE;
412 }
413
414 /**
415 The main entry point to SMM Foundation.
416
417 Note: This function is only used by SMRAM invocation. It is never used by DXE invocation.
418
419 @param SmmEntryContext Processor information and functionality
420 needed by SMM Foundation.
421
422 **/
423 VOID
424 EFIAPI
425 SmmEntryPoint (
426 IN CONST EFI_SMM_ENTRY_CONTEXT *SmmEntryContext
427 )
428 {
429 EFI_STATUS Status;
430 EFI_SMM_COMMUNICATE_HEADER *CommunicateHeader;
431 BOOLEAN InLegacyBoot;
432 BOOLEAN IsOverlapped;
433
434 PERF_START (NULL, "SMM", NULL, 0) ;
435
436 //
437 // Update SMST with contents of the SmmEntryContext structure
438 //
439 gSmmCoreSmst.SmmStartupThisAp = SmmEntryContext->SmmStartupThisAp;
440 gSmmCoreSmst.CurrentlyExecutingCpu = SmmEntryContext->CurrentlyExecutingCpu;
441 gSmmCoreSmst.NumberOfCpus = SmmEntryContext->NumberOfCpus;
442 gSmmCoreSmst.CpuSaveStateSize = SmmEntryContext->CpuSaveStateSize;
443 gSmmCoreSmst.CpuSaveState = SmmEntryContext->CpuSaveState;
444
445 //
446 // Call platform hook before Smm Dispatch
447 //
448 PlatformHookBeforeSmmDispatch ();
449
450 //
451 // If a legacy boot has occured, then make sure gSmmCorePrivate is not accessed
452 //
453 InLegacyBoot = mInLegacyBoot;
454 if (!InLegacyBoot) {
455 //
456 // Mark the InSmm flag as TRUE, it will be used by SmmBase2 protocol
457 //
458 gSmmCorePrivate->InSmm = TRUE;
459
460 //
461 // Check to see if this is a Synchronous SMI sent through the SMM Communication
462 // Protocol or an Asynchronous SMI
463 //
464 if (gSmmCorePrivate->CommunicationBuffer != NULL) {
465 //
466 // Synchronous SMI for SMM Core or request from Communicate protocol
467 //
468 IsOverlapped = InternalIsBufferOverlapped (
469 (UINT8 *) gSmmCorePrivate->CommunicationBuffer,
470 gSmmCorePrivate->BufferSize,
471 (UINT8 *) gSmmCorePrivate,
472 sizeof (*gSmmCorePrivate)
473 );
474 if (!SmmIsBufferOutsideSmmValid ((UINTN)gSmmCorePrivate->CommunicationBuffer, gSmmCorePrivate->BufferSize) || IsOverlapped) {
475 //
476 // If CommunicationBuffer is not in valid address scope,
477 // or there is overlap between gSmmCorePrivate and CommunicationBuffer,
478 // return EFI_INVALID_PARAMETER
479 //
480 gSmmCorePrivate->CommunicationBuffer = NULL;
481 gSmmCorePrivate->ReturnStatus = EFI_INVALID_PARAMETER;
482 } else {
483 CommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *)gSmmCorePrivate->CommunicationBuffer;
484 gSmmCorePrivate->BufferSize -= OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data);
485 Status = SmiManage (
486 &CommunicateHeader->HeaderGuid,
487 NULL,
488 CommunicateHeader->Data,
489 &gSmmCorePrivate->BufferSize
490 );
491 //
492 // Update CommunicationBuffer, BufferSize and ReturnStatus
493 // Communicate service finished, reset the pointer to CommBuffer to NULL
494 //
495 gSmmCorePrivate->BufferSize += OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data);
496 gSmmCorePrivate->CommunicationBuffer = NULL;
497 gSmmCorePrivate->ReturnStatus = (Status == EFI_SUCCESS) ? EFI_SUCCESS : EFI_NOT_FOUND;
498 }
499 }
500 }
501
502 //
503 // Process Asynchronous SMI sources
504 //
505 SmiManage (NULL, NULL, NULL, NULL);
506
507 //
508 // Call platform hook after Smm Dispatch
509 //
510 PlatformHookAfterSmmDispatch ();
511
512 //
513 // If a legacy boot has occured, then make sure gSmmCorePrivate is not accessed
514 //
515 if (!InLegacyBoot) {
516 //
517 // Clear the InSmm flag as we are going to leave SMM
518 //
519 gSmmCorePrivate->InSmm = FALSE;
520 }
521
522 PERF_END (NULL, "SMM", NULL, 0) ;
523 }
524
525 /**
526 Install LoadedImage protocol for SMM Core.
527 **/
528 VOID
529 SmmCoreInstallLoadedImage (
530 VOID
531 )
532 {
533 EFI_STATUS Status;
534 EFI_HANDLE Handle;
535
536 //
537 // Allocate a Loaded Image Protocol in EfiBootServicesData
538 //
539 Status = gBS->AllocatePool (EfiBootServicesData, sizeof(EFI_LOADED_IMAGE_PROTOCOL), (VOID **)&mSmmCoreLoadedImage);
540 ASSERT_EFI_ERROR (Status);
541
542 ZeroMem (mSmmCoreLoadedImage, sizeof (EFI_LOADED_IMAGE_PROTOCOL));
543 //
544 // Fill in the remaining fields of the Loaded Image Protocol instance.
545 // Note: ImageBase is an SMRAM address that can not be accessed outside of SMRAM if SMRAM window is closed.
546 //
547 mSmmCoreLoadedImage->Revision = EFI_LOADED_IMAGE_PROTOCOL_REVISION;
548 mSmmCoreLoadedImage->ParentHandle = gSmmCorePrivate->SmmIplImageHandle;
549 mSmmCoreLoadedImage->SystemTable = gST;
550
551 mSmmCoreLoadedImage->ImageBase = (VOID *)(UINTN)gSmmCorePrivate->PiSmmCoreImageBase;
552 mSmmCoreLoadedImage->ImageSize = gSmmCorePrivate->PiSmmCoreImageSize;
553 mSmmCoreLoadedImage->ImageCodeType = EfiRuntimeServicesCode;
554 mSmmCoreLoadedImage->ImageDataType = EfiRuntimeServicesData;
555
556 //
557 // Create a new image handle in the UEFI handle database for the SMM Driver
558 //
559 Handle = NULL;
560 Status = gBS->InstallMultipleProtocolInterfaces (
561 &Handle,
562 &gEfiLoadedImageProtocolGuid, mSmmCoreLoadedImage,
563 NULL
564 );
565 ASSERT_EFI_ERROR (Status);
566
567 return ;
568 }
569
570 /**
571 The Entry Point for SMM Core
572
573 Install DXE Protocols and reload SMM Core into SMRAM and register SMM Core
574 EntryPoint on the SMI vector.
575
576 Note: This function is called for both DXE invocation and SMRAM invocation.
577
578 @param ImageHandle The firmware allocated handle for the EFI image.
579 @param SystemTable A pointer to the EFI System Table.
580
581 @retval EFI_SUCCESS The entry point is executed successfully.
582 @retval Other Some error occurred when executing this entry point.
583
584 **/
585 EFI_STATUS
586 EFIAPI
587 SmmMain (
588 IN EFI_HANDLE ImageHandle,
589 IN EFI_SYSTEM_TABLE *SystemTable
590 )
591 {
592 EFI_STATUS Status;
593 UINTN Index;
594
595 //
596 // Get SMM Core Private context passed in from SMM IPL in ImageHandle.
597 //
598 gSmmCorePrivate = (SMM_CORE_PRIVATE_DATA *)ImageHandle;
599
600 //
601 // Fill in SMRAM physical address for the SMM Services Table and the SMM Entry Point.
602 //
603 gSmmCorePrivate->Smst = &gSmmCoreSmst;
604 gSmmCorePrivate->SmmEntryPoint = SmmEntryPoint;
605
606 //
607 // No need to initialize memory service.
608 // It is done in constructor of PiSmmCoreMemoryAllocationLib(),
609 // so that the library linked with PiSmmCore can use AllocatePool() in constuctor.
610 //
611
612 SmramProfileInit ();
613
614 //
615 // Copy FullSmramRanges to SMRAM
616 //
617 mFullSmramRangeCount = gSmmCorePrivate->SmramRangeCount;
618 mFullSmramRanges = AllocatePool (mFullSmramRangeCount * sizeof (EFI_SMRAM_DESCRIPTOR));
619 ASSERT (mFullSmramRanges != NULL);
620 CopyMem (mFullSmramRanges, gSmmCorePrivate->SmramRanges, mFullSmramRangeCount * sizeof (EFI_SMRAM_DESCRIPTOR));
621
622 //
623 // Register all SMI Handlers required by the SMM Core
624 //
625 for (Index = 0; mSmmCoreSmiHandlers[Index].HandlerType != NULL; Index++) {
626 Status = SmiHandlerRegister (
627 mSmmCoreSmiHandlers[Index].Handler,
628 mSmmCoreSmiHandlers[Index].HandlerType,
629 &mSmmCoreSmiHandlers[Index].DispatchHandle
630 );
631 ASSERT_EFI_ERROR (Status);
632 }
633
634 RegisterSmramProfileHandler ();
635 SmramProfileInstallProtocol ();
636
637 SmmCoreInstallLoadedImage ();
638
639 return EFI_SUCCESS;
640 }
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