summaryrefslogtreecommitdiff
path: root/EdkNt32Pkg/Library/EdkGenericBdsLib/BdsConsole.c
blob: 6c9097f142eb963ee2e1df3b763822f6157b2090 (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
/*++

Copyright (c) 2006, 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.             

Module Name:

  BdsConsole.c

Abstract:

  BDS Lib functions which contain all the code to connect console device

--*/

BOOLEAN
IsNvNeed (
  IN CHAR16 *ConVarName
  )
{
  CHAR16 *Ptr;
  
  Ptr = ConVarName;
  
  //
  // If the variable includes "Dev" at last, we consider
  // it does not support NV attribute.
  //
  while (*Ptr) {
    Ptr++;
  }
  
  if ((*(Ptr - 3) == 'D') && (*(Ptr - 2) == 'e') && (*(Ptr - 1) == 'v')) {
    return FALSE;
  } else {
    return TRUE;
  }
}

EFI_STATUS
BdsLibUpdateConsoleVariable (
  IN  CHAR16                    *ConVarName,
  IN  EFI_DEVICE_PATH_PROTOCOL  *CustomizedConDevicePath,
  IN  EFI_DEVICE_PATH_PROTOCOL  *ExclusiveDevicePath
  )
/*++

Routine Description:

  This function update console variable based on ConVarName, it can 
  add or remove one specific console device path from the variable

Arguments:

  ConVarName   - Console related variable name, ConIn, ConOut, ErrOut.

  CustomizedConDevicePath - The console device path which will be added to
                            the console variable ConVarName, this parameter
                            can not be multi-instance.

  ExclusiveDevicePath     - The console device path which will be removed
                            from the console variable ConVarName, this
                            parameter can not be multi-instance.

Returns:

  EFI_UNSUPPORTED         - Add or remove the same device path.
  
  EFI_SUCCESS             - Success add or remove the device path from 
                            the console variable.

--*/
{
  EFI_STATUS                Status;
  EFI_DEVICE_PATH_PROTOCOL  *VarConsole;
  UINTN                     DevicePathSize;
  EFI_DEVICE_PATH_PROTOCOL  *NewDevicePath;
  EFI_DEVICE_PATH_PROTOCOL  *TempNewDevicePath;
  UINT32                    Attributes;

  VarConsole      = NULL;
  DevicePathSize  = 0;
  Status          = EFI_UNSUPPORTED;

  //
  // Notes: check the device path point, here should check
  // with compare memory
  //
  if (CustomizedConDevicePath == ExclusiveDevicePath) {
    return EFI_UNSUPPORTED;
  }
  //
  // Delete the ExclusiveDevicePath from current default console
  //
  VarConsole = BdsLibGetVariableAndSize (
                ConVarName,
                &gEfiGlobalVariableGuid,
                &DevicePathSize
                );
                
  //
  // Initialize NewDevicePath
  //
  NewDevicePath  = VarConsole;
  
  //
  // If ExclusiveDevicePath is even the part of the instance in VarConsole, delete it.
  // In the end, NewDevicePath is the final device path.
  //
  if (ExclusiveDevicePath != NULL && VarConsole != NULL) {
      NewDevicePath = BdsLibDelPartMatchInstance (VarConsole, ExclusiveDevicePath);
  }
  //
  // Try to append customized device path to NewDevicePath.
  //
  if (CustomizedConDevicePath != NULL) {
    if (!BdsLibMatchDevicePaths (NewDevicePath, CustomizedConDevicePath)) {
      //
      // Check if there is part of CustomizedConDevicePath in NewDevicePath, delete it.
      //
      NewDevicePath = BdsLibDelPartMatchInstance (NewDevicePath, CustomizedConDevicePath);
      //
      // In the first check, the default console variable will be null,
      // just append current customized device path
      //
      TempNewDevicePath = NewDevicePath;
      NewDevicePath = AppendDevicePathInstance (NewDevicePath, CustomizedConDevicePath);
      BdsLibSafeFreePool(TempNewDevicePath);
    }
  }
  
  //
  // The attribute for ConInDev, ConOutDev and ErrOutDev does not include NV.
  //
  if (IsNvNeed(ConVarName)) {
    //
    // ConVarName has NV attribute.
    //
    Attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE;
  } else {
    //
    // ConVarName does not have NV attribute.
    //
    Attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
  }
  
  //
  // Finally, Update the variable of the default console by NewDevicePath
  //
  gRT->SetVariable (
        ConVarName,
        &gEfiGlobalVariableGuid,
        Attributes,
        GetDevicePathSize (NewDevicePath),
        NewDevicePath
        );

  if (VarConsole == NewDevicePath) {
    BdsLibSafeFreePool(VarConsole);
  } else {
    BdsLibSafeFreePool(VarConsole);
    BdsLibSafeFreePool(NewDevicePath);
  }

  return EFI_SUCCESS;

}

EFI_STATUS
BdsLibConnectConsoleVariable (
  IN  CHAR16                 *ConVarName
  )
/*++

Routine Description:

  Connect the console device base on the variable ConVarName, if
  device path of the ConVarName is multi-instance device path, if
  anyone of the instances is connected success, then this function
  will return success.

Arguments:

  ConVarName   - Console related variable name, ConIn, ConOut, ErrOut.

Returns:

  EFI_NOT_FOUND           - There is not any console devices connected success
  
  EFI_SUCCESS             - Success connect any one instance of the console
                            device path base on the variable ConVarName.

--*/
{
  EFI_STATUS                Status;
  EFI_DEVICE_PATH_PROTOCOL  *StartDevicePath;
  UINTN                     VariableSize;
  EFI_DEVICE_PATH_PROTOCOL  *Instance;
  EFI_DEVICE_PATH_PROTOCOL  *Next;
  EFI_DEVICE_PATH_PROTOCOL  *CopyOfDevicePath;
  UINTN                     Size;
  BOOLEAN                   DeviceExist;

  Status      = EFI_SUCCESS;
  DeviceExist = FALSE;

  //
  // Check if the console variable exist
  //
  StartDevicePath = BdsLibGetVariableAndSize (
                      ConVarName,
                      &gEfiGlobalVariableGuid,
                      &VariableSize
                      );
  if (StartDevicePath == NULL) {
    return EFI_UNSUPPORTED;
  }

  CopyOfDevicePath = StartDevicePath;
  do {
    //
    // Check every instance of the console variable
    //
    Instance  = GetNextDevicePathInstance (&CopyOfDevicePath, &Size);
    Next      = Instance;
    while (!IsDevicePathEndType (Next)) {
      Next = NextDevicePathNode (Next);
    }

    SetDevicePathEndNode (Next);

    //
    // Connect the instance device path
    //
    Status = BdsLibConnectDevicePath (Instance);
    if (EFI_ERROR (Status)) {
      //
      // Delete the instance from the console varialbe
      //
      BdsLibUpdateConsoleVariable (ConVarName, NULL, Instance);
    } else {
      DeviceExist = TRUE;
    }
    BdsLibSafeFreePool(Instance);
  } while (CopyOfDevicePath != NULL);

  gBS->FreePool (StartDevicePath);

  if (DeviceExist == FALSE) {
    return EFI_NOT_FOUND;
  }

  return EFI_SUCCESS;
}

VOID
BdsLibConnectAllConsoles (
  VOID
  )
/*++

Routine Description:

  This function will search every simpletxt devive in current system,
  and make every simpletxt device as pertantial console device.

Arguments:

  None

Returns:

  None

--*/
{
  EFI_STATUS                Status;
  UINTN                     Index;
  EFI_DEVICE_PATH_PROTOCOL  *ConDevicePath;
  UINTN                     HandleCount;
  EFI_HANDLE                *HandleBuffer;

  Index         = 0;
  HandleCount   = 0;
  HandleBuffer  = NULL;
  ConDevicePath = NULL;

  //
  // Update all the console varables
  //
  Status = gBS->LocateHandleBuffer (
                  ByProtocol,
                  &gEfiSimpleTextInProtocolGuid,
                  NULL,
                  &HandleCount,
                  &HandleBuffer
                  );
  for (Index = 0; Index < HandleCount; Index++) {
    Status = gBS->HandleProtocol (
                    HandleBuffer[Index],
                    &gEfiDevicePathProtocolGuid,
                    (VOID **) &ConDevicePath
                    );
    BdsLibUpdateConsoleVariable (L"ConIn", ConDevicePath, NULL);
  }

  BdsLibSafeFreePool(HandleBuffer);

  Status = gBS->LocateHandleBuffer (
                  ByProtocol,
                  &gEfiSimpleTextOutProtocolGuid,
                  NULL,
                  &HandleCount,
                  &HandleBuffer
                  );
  for (Index = 0; Index < HandleCount; Index++) {
    Status = gBS->HandleProtocol (
                    HandleBuffer[Index],
                    &gEfiDevicePathProtocolGuid,
                    (VOID **) &ConDevicePath
                    );
    BdsLibUpdateConsoleVariable (L"ConOut", ConDevicePath, NULL);
    BdsLibUpdateConsoleVariable (L"ErrOut", ConDevicePath, NULL);
  }

  BdsLibSafeFreePool(HandleBuffer);

  //
  // Connect all console variables
  //
  BdsLibConnectAllDefaultConsoles ();

}

EFI_STATUS
BdsLibConnectAllDefaultConsoles (
  VOID
  )
/*++

Routine Description:

  This function will connect console device base on the console 
  device variable ConIn, ConOut and ErrOut.

Arguments:

  None

Returns:

  EFI_SUCCESS      - At least one of the ConIn and ConOut device have
                     been connected success.
                     
  EFI_STATUS       - Return the status of BdsLibConnectConsoleVariable ().

--*/
{
  EFI_STATUS                Status;

  //
  // Connect all default console variables
  //
  Status = BdsLibConnectConsoleVariable (L"ConIn");
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = BdsLibConnectConsoleVariable (L"ConOut");
  if (EFI_ERROR (Status)) {
    return Status;
  }
  //
  // Special treat the err out device, becaues the null
  // err out var is legal.
  //
  BdsLibConnectConsoleVariable (L"ErrOut");

  return EFI_SUCCESS;

}