summaryrefslogtreecommitdiff
path: root/EdkCompatibilityPkg/Compatibility/SmmBaseOnSmmBase2Thunk/SmmBaseOnSmmBase2Thunk.c
blob: fe6024af529aff26e4cfe3b475356f0017396342 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
/** @file
  SMM Base Protocol on SMM Base2 Protocol Thunk driver.

  This driver co-operates with SMM Base Helper SMM driver to provide SMM Base Protocol
  based on SMM Base2 Protocol.

  This thunk driver is expected to be loaded before PI SMM IPL driver so that
  SMM BASE Protocol can be published immediately after SMM Base2 Protocol is installed to
  make SMM Base Protocol.InSmm() as early as possible.

  Copyright (c) 2009 Intel Corporation
  All rights reserved. This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include  "SmmBaseOnSmmBase2Thunk.h"

EFI_SMM_BASE_PROTOCOL gSmmBase = {
  SmmBaseRegister,
  SmmBaseUnregister,
  SmmBaseCommunicate,
  SmmBaseRegisterCallback,
  SmmBaseInSmm,
  SmmBaseSmmAllocatePool,
  SmmBaseSmmFreePool,
  SmmBaseGetSmstLocation
};

SMMBASETHUNK_COMMUNICATION_DATA gCommunicationData = {
  EFI_SMM_BASE_THUNK_COMMUNICATION_GUID,
  sizeof (SMMBASE_FUNCTION_DATA)
};

EFI_HANDLE                         mImageHandle;
EFI_SMM_BASE2_PROTOCOL             *mSmmBase2 = NULL;
EFI_SMM_COMMUNICATION_PROTOCOL     *mSmmCommunication = NULL;
EFI_SMM_BASE_HELPER_READY_PROTOCOL *mSmmBaseHelperReady = NULL;

BOOLEAN
IsInSmm (
  VOID
  )
{
  EFI_STATUS Status;
  BOOLEAN    InSmm;
  
  Status = mSmmBase2->InSmm (mSmmBase2, &InSmm);
  ASSERT_EFI_ERROR (Status);
  return InSmm;
}

/**
  Invoke services provided by SMM Base Helper SMM driver.
**/
VOID
SmmBaseHelperService (
  VOID
  )
{
  UINTN DataSize;

  gCommunicationData.FunctionData.Status = EFI_UNSUPPORTED;

  if (IsInSmm()) {
    ///
    /// If in SMM mode, directly call services in SMM Base Helper.
    ///
    if (mSmmBaseHelperReady == NULL) {
      ASSERT (FALSE);
      return;
    }

    DataSize = (UINTN)(sizeof (SMMBASE_FUNCTION_DATA));
    mSmmBaseHelperReady->ServiceEntry (
                           NULL,
                           NULL,
                           &gCommunicationData.FunctionData,
                           &DataSize
                           );
  } else {
    ///
    /// If in non-SMM mode, call services in SMM Base Helper via SMM Communication Protocol.
    ///
    if (mSmmCommunication == NULL) {
      ASSERT (FALSE);
      return;
    }

    DataSize = (UINTN)(sizeof (gCommunicationData));
    mSmmCommunication->Communicate (
                         mSmmCommunication,
                         &gCommunicationData,
                         &DataSize
                         );
  }
}

/**
  Register a given driver into SMRAM. This is the equivalent of performing
  the LoadImage/StartImage into System Management Mode.

  @param[in]   This                  Protocol instance pointer.
  @param[in]   FilePath              Location of the image to be installed as the handler.
  @param[in]   SourceBuffer          Optional source buffer in case the image file
                                     is in memory.
  @param[in]   SourceSize            Size of the source image file, if in memory.
  @param[out]  ImageHandle           The handle that the base driver uses to decode 
                                     the handler. Unique among SMM handlers only, 
                                     not unique across DXE/EFI.
  @param[in]   LegacyIA32Binary      An optional parameter specifying that the associated 
                                     file is a real-mode IA-32 binary.

  @retval      EFI_SUCCESS           The operation was successful.
  @retval      EFI_OUT_OF_RESOURCES  There were no additional SMRAM resources to load the handler
  @retval      EFI_UNSUPPORTED       This platform does not support 16-bit handlers.
  @retval      EFI_UNSUPPORTED       Platform is in runtime.
  @retval      EFI_INVALID_PARAMETER The handlers was not the correct image type
**/
EFI_STATUS
EFIAPI
SmmBaseRegister (
  IN      EFI_SMM_BASE_PROTOCOL     *This,
  IN      EFI_DEVICE_PATH_PROTOCOL  *FilePath,
  IN      VOID                      *SourceBuffer,
  IN      UINTN                     SourceSize,
  OUT     EFI_HANDLE                *ImageHandle,
  IN      BOOLEAN                   LegacyIA32Binary
  )
{
  if (LegacyIA32Binary) {
    return EFI_UNSUPPORTED;
  }

  gCommunicationData.FunctionData.Function = SMMBASE_REGISTER;
  gCommunicationData.FunctionData.Args.Register.FilePath = FilePath;
  gCommunicationData.FunctionData.Args.Register.SourceBuffer = SourceBuffer;
  gCommunicationData.FunctionData.Args.Register.SourceSize = SourceSize;
  gCommunicationData.FunctionData.Args.Register.ImageHandle = ImageHandle;
  gCommunicationData.FunctionData.Args.Register.LegacyIA32Binary = LegacyIA32Binary;

  SmmBaseHelperService ();
  return gCommunicationData.FunctionData.Status;
}

/**
  Removes a handler from execution within SMRAM.  This is the equivalent of performing
  the UnloadImage in System Management Mode.

  @param[in]  This                  Protocol instance pointer.
  @param[in]  ImageHandle           The handler to be removed.

  @retval     EFI_SUCCESS           The operation was successful
  @retval     EFI_INVALID_PARAMETER The handler did not exist
  @retval     EFI_UNSUPPORTED       Platform is in runtime.
**/
EFI_STATUS
EFIAPI
SmmBaseUnregister (
  IN      EFI_SMM_BASE_PROTOCOL     *This,
  IN      EFI_HANDLE                ImageHandle
  )
{
  gCommunicationData.FunctionData.Function = SMMBASE_UNREGISTER;
  gCommunicationData.FunctionData.Args.UnRegister.ImageHandle = ImageHandle;

  SmmBaseHelperService ();
  return gCommunicationData.FunctionData.Status;
}

/**
  The SMM Inter-module Communicate Service Communicate() function
  provides a service to send/receive messages from a registered
  EFI service.  The BASE protocol driver is responsible for doing
  any of the copies such that the data lives in boot-service-accessible RAM.

  @param[in]      This                  Protocol instance pointer.
  @param[in]      ImageHandle           The handle of the registered driver.
  @param[in,out]  CommunicationBuffer   Pointer to the buffer to convey into SMRAM.
  @param[in,out]  BufferSize            The size of the data buffer being passed in.
                                        On exit, the size of data being returned.
                                        Zero if the handler does not wish to reply with any data.

  @retval         EFI_SUCCESS           The message was successfully posted
  @retval         EFI_INVALID_PARAMETER The buffer was NULL
**/
EFI_STATUS
EFIAPI
SmmBaseCommunicate (
  IN      EFI_SMM_BASE_PROTOCOL     *This,
  IN      EFI_HANDLE                ImageHandle,
  IN OUT  VOID                      *CommunicationBuffer,
  IN OUT  UINTN                     *BufferSize
  )
{
  if (mSmmCommunication == NULL) {
    ASSERT (FALSE);
    return EFI_UNSUPPORTED;
  }

  return mSmmCommunication->Communicate (
                              mSmmCommunication,
                              CommunicationBuffer,
                              BufferSize
                              );
}

/**
  Register a callback to execute within SMM.
  This allows receipt of messages created with EFI_SMM_BASE_PROTOCOL.Communicate().

  @param[in]  This                  Protocol instance pointer.
  @param[in]  SmmImageHandle        Handle of the callback service.
  @param[in]  CallbackAddress       Address of the callback service.
  @param[in]  MakeLast              If present, will stipulate that the handler is posted to 
                                    be executed last in the dispatch table.
  @param[in]  FloatingPointSave     An optional parameter that informs the
                                    EFI_SMM_ACCESS_PROTOCOL Driver core if it needs to save
                                    the floating point register state. If any handler
                                    require this, the state will be saved for all handlers.

  @retval     EFI_SUCCESS           The operation was successful
  @retval     EFI_OUT_OF_RESOURCES  Not enough space in the dispatch queue
  @retval     EFI_UNSUPPORTED       Platform is in runtime.
  @retval     EFI_UNSUPPORTED       The caller is not in SMM.
**/
EFI_STATUS
EFIAPI
SmmBaseRegisterCallback (
  IN      EFI_SMM_BASE_PROTOCOL         *This,
  IN      EFI_HANDLE                    SmmImageHandle,
  IN      EFI_SMM_CALLBACK_ENTRY_POINT  CallbackAddress,
  IN      BOOLEAN                       MakeLast,
  IN      BOOLEAN                       FloatingPointSave
  )
{
  if (!IsInSmm()) {
    return EFI_UNSUPPORTED;
  }

  gCommunicationData.FunctionData.Function = SMMBASE_REGISTER_CALLBACK;
  gCommunicationData.FunctionData.Args.RegisterCallback.SmmImageHandle = SmmImageHandle;
  gCommunicationData.FunctionData.Args.RegisterCallback.CallbackAddress = CallbackAddress;
  gCommunicationData.FunctionData.Args.RegisterCallback.MakeLast = MakeLast;
  gCommunicationData.FunctionData.Args.RegisterCallback.FloatingPointSave = FloatingPointSave;

  SmmBaseHelperService();
  return gCommunicationData.FunctionData.Status;
}

/**
  This routine tells caller if execution context is SMM or not.

  @param[in]   This                   Protocol instance pointer.
  @param[out]  InSmm                  Whether the caller is inside SMM for IA-32
                                      or servicing a PMI for the Itanium processor
                                      family.

  @retval      EFI_SUCCESS            The operation was successful
  @retval      EFI_INVALID_PARAMETER  InSmm was NULL.
**/
EFI_STATUS
EFIAPI
SmmBaseInSmm (
  IN      EFI_SMM_BASE_PROTOCOL     *This,
  OUT     BOOLEAN                   *InSmm
  )
{
  return mSmmBase2->InSmm (mSmmBase2, InSmm);
}

/**
  The SmmAllocatePool() function allocates a memory region of Size bytes from memory of
  type PoolType and returns the address of the allocated memory in the location referenced
  by Buffer.  This function allocates pages from EFI SMRAM Memory as needed to grow the
  requested pool type.  All allocations are eight-byte aligned.

  @param[in]   This                  Protocol instance pointer.
  @param[in]   PoolType              The type of pool to allocate.
                                     The only supported type is EfiRuntimeServicesData;
                                     the interface will internally map this runtime request to 
                                     SMRAM for IA-32 and leave as this type for the Itanium 
                                     processor family. Other types can be ignored.
  @param[in]   Size                  The number of bytes to allocate from the pool.
  @param[out]  Buffer                A pointer to a pointer to the allocated buffer if the call
                                     succeeds; undefined otherwise.

  @retval      EFI_SUCCESS           The requested number of bytes was allocated.
  @retval      EFI_OUT_OF_RESOURCES  The pool requested could not be allocated.
  @retval      EFI_UNSUPPORTED       Platform is in runtime.
**/
EFI_STATUS
EFIAPI
SmmBaseSmmAllocatePool (
  IN      EFI_SMM_BASE_PROTOCOL     *This,
  IN      EFI_MEMORY_TYPE           PoolType,
  IN      UINTN                     Size,
  OUT     VOID                      **Buffer
  )
{
  gCommunicationData.FunctionData.Function = SMMBASE_ALLOCATE_POOL;
  gCommunicationData.FunctionData.Args.AllocatePool.PoolType = PoolType;
  gCommunicationData.FunctionData.Args.AllocatePool.Size = Size;
  gCommunicationData.FunctionData.Args.AllocatePool.Buffer = Buffer;

  SmmBaseHelperService ();
  return gCommunicationData.FunctionData.Status;
}

/**
  The SmmFreePool() function returns the memory specified by Buffer to the system.
  On return, the memory's type is EFI SMRAM Memory.  The Buffer that is freed must
  have been allocated by SmmAllocatePool().

  @param[in]  This                  Protocol instance pointer.
  @param[in]  Buffer                Pointer to the buffer allocation.

  @retval     EFI_SUCCESS           The memory was returned to the system.
  @retval     EFI_INVALID_PARAMETER Buffer was invalid.
  @retval     EFI_UNSUPPORTED       Platform is in runtime.
**/
EFI_STATUS
EFIAPI
SmmBaseSmmFreePool (
  IN      EFI_SMM_BASE_PROTOCOL     *This,
  IN      VOID                      *Buffer
  )
{
  gCommunicationData.FunctionData.Function = SMMBASE_FREE_POOL;
  gCommunicationData.FunctionData.Args.FreePool.Buffer = Buffer;

  SmmBaseHelperService ();
  return gCommunicationData.FunctionData.Status;
}

/**
  The GetSmstLocation() function returns the location of the System Management
  Service Table.  The use of the API is such that a driver can discover the
  location of the SMST in its entry point and then cache it in some driver
  global variable so that the SMST can be invoked in subsequent callbacks.

  @param[in]  This                  Protocol instance pointer.
  @param[in]  Smst                  Pointer to the SMST.

  @retval     EFI_SUCCESS           The operation was successful
  @retval     EFI_INVALID_PARAMETER Smst was invalid.
  @retval     EFI_UNSUPPORTED       Not in SMM.
**/
EFI_STATUS
EFIAPI
SmmBaseGetSmstLocation (
  IN      EFI_SMM_BASE_PROTOCOL     *This,
  OUT     EFI_SMM_SYSTEM_TABLE      **Smst
  )
{
  if (mSmmBaseHelperReady == NULL) {
    ASSERT (FALSE);
    return EFI_UNSUPPORTED;
  }

  if (!IsInSmm ()) {
    return EFI_UNSUPPORTED;
  }

  if (Smst == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  *Smst = mSmmBaseHelperReady->FrameworkSmst;
  return EFI_SUCCESS;
}

/**
  SMM Base Protocol notification event handler.

  @param[in] Event    Event whose notification function is being invoked.
  @param[in] Context  Pointer to the notification function's context.
**/
VOID
EFIAPI
SmmBaseProtocolNotification (
  IN EFI_EVENT  Event,
  IN VOID       *Context
  )
{
  EFI_STATUS Status;

  ///
  /// Assume only one instance of SMM Base2 Protocol in the system
  /// Locate SMM Base2 Protocol
  ///
  Status = gBS->LocateProtocol (&gEfiSmmBase2ProtocolGuid, NULL, (VOID **) &mSmmBase2);
  if (!EFI_ERROR (Status)) {
    ///
    /// Publish Framework SMM BASE Protocol immediately after SMM Base2 Protocol is installed to
    /// make SMM Base Protocol.InSmm() available as early as possible.
    ///
    Status = gBS->InstallProtocolInterface (
                    &mImageHandle,
                    &gEfiSmmBaseProtocolGuid,
                    EFI_NATIVE_INTERFACE,
                    &gSmmBase
                    );
    ASSERT_EFI_ERROR (Status);
  }
}

/**
  SMM Communication Protocol notification event handler.

  @param[in] Event    Event whose notification function is being invoked.
  @param[in] Context  Pointer to the notification function's context.
**/
VOID
EFIAPI
SmmCommunicationProtocolNotification (
  IN EFI_EVENT  Event,
  IN VOID       *Context
  )
{
  ///
  /// Assume only one instance of SMM Communication Protocol in the system
  /// Locate SMM Communication Protocol
  ///
  gBS->LocateProtocol (&gEfiSmmCommunicationProtocolGuid, NULL, (VOID **) &mSmmCommunication);
}

/**
  SMM Base Helper Ready Protocol notification event handler.

  @param[in] Event    Event whose notification function is being invoked.
  @param[in] Context  Pointer to the notification function's context.
**/
VOID
EFIAPI
SmmBaseHelperReadyProtocolNotification (
  IN EFI_EVENT  Event,
  IN VOID       *Context
  )
{
  ///
  /// Assume only one instance of SMM Base Helper Ready Protocol in the system
  /// Locate SMM Base Helper Ready Protocol
  ///
  gBS->LocateProtocol (&gEfiSmmBaseHelperReadyProtocolGuid, NULL, (VOID **) &mSmmBaseHelperReady);
}

/**
  Entry Point for SMM Base Protocol on SMM Base2 Protocol Thunk driver.

  @param[in] ImageHandle  Image handle of this driver.
  @param[in] SystemTable  A Pointer to the EFI System Table.

  @retval EFI_SUCCESS  The entry point is executed successfully.
**/
EFI_STATUS
EFIAPI
SmmBaseThunkMain (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  VOID *Registration;

  mImageHandle = ImageHandle;

  ///
  /// Install notifications for required protocols
  ///
  /// Note we use protocol notifications here so as that this thunk driver can be
  /// loaded before PI SMM IPL driver. Framework SMM BASE Protocol will be published 
  /// immediately after SMM Base2 Protocol is installed to make SMM Base Protocol.InSmm()
  /// available as early as possible because some Framework code's behavior depends on
  /// correct detection of SMM mode via SMM Base Protocol.InSmm().
  ///
  /// Also SMM Base Helper driver is expected to be dispatched
  /// in the earliest round of SMM driver dispatch just after SMM IPL driver loads SMM Foundation.
  /// So the full functionality of SMM Base Protocol is ready immediately after SMM IPL driver is
  /// loaded. Since that point Framework SMM driver can be succesufully supported.
  ///
  EfiCreateProtocolNotifyEvent (
    &gEfiSmmBase2ProtocolGuid,
    TPL_CALLBACK,
    SmmBaseProtocolNotification,
    NULL,
    &Registration
    );

  EfiCreateProtocolNotifyEvent (
    &gEfiSmmCommunicationProtocolGuid,
    TPL_CALLBACK,
    SmmCommunicationProtocolNotification,
    NULL,
    &Registration
    );

  EfiCreateProtocolNotifyEvent (
    &gEfiSmmBaseHelperReadyProtocolGuid,
    TPL_CALLBACK,
    SmmBaseHelperReadyProtocolNotification,
    NULL,
    &Registration
    );

  return EFI_SUCCESS;
}