summaryrefslogtreecommitdiff
path: root/EdkUnixPkg/Library/EdkGenericBdsLib/BdsConnect.c
blob: 9c649f1f82e410052fbdfbfee24d635e6f7f056d (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
/*++

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:

  BdsConnect.c

Abstract:

  BDS Lib functions which relate with connect the device

--*/

VOID
BdsLibConnectAll (
  VOID
  )
/*++

Routine Description:
  
  This function will connect all the system driver to controller
  first, and then special connect the default console, this make
  sure all the system controller avialbe and the platform default
  console connected.
  
Arguments:

  None

Returns:

  None

--*/
{
  //
  // Connect the platform console first
  //
  BdsLibConnectAllDefaultConsoles ();

  //
  // Generic way to connect all the drivers
  //
  BdsLibConnectAllDriversToAllControllers ();

  //
  // Here we have the assumption that we have already had
  // platform default console
  //
  BdsLibConnectAllDefaultConsoles ();
}

VOID
BdsLibGenericConnectAll (
  VOID
  )
/*++

Routine Description:
  
  This function will connect all the system drivers to all controllers
  first, and then connect all the console devices the system current 
  have. After this we should get all the device work and console avariable
  if the system have console device.
  
Arguments:

  None

Returns:

  None

--*/
{
  //
  // Most generic way to connect all the drivers
  //
  BdsLibConnectAllDriversToAllControllers ();
  BdsLibConnectAllConsoles ();
}

EFI_STATUS
BdsLibConnectDevicePath (
  IN EFI_DEVICE_PATH_PROTOCOL  *DevicePathToConnect
  )
/*++

Routine Description:
  This function will create all handles associate with every device
  path node. If the handle associate with one device path node can not
  be created success, then still give one chance to do the dispatch,
  which load the missing drivers if possible.
  
Arguments:

  DevicePathToConnect  - The device path which will be connected, it can
                         be a multi-instance device path

Returns:

  EFI_SUCCESS          - All handles associate with every device path 
                         node have been created
  
  EFI_OUT_OF_RESOURCES - There is no resource to create new handles
  
  EFI_NOT_FOUND        - Create the handle associate with one device 
                         path node failed

--*/
{
  EFI_STATUS                Status;
  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
  EFI_DEVICE_PATH_PROTOCOL  *CopyOfDevicePath;
  EFI_DEVICE_PATH_PROTOCOL  *Instance;
  EFI_DEVICE_PATH_PROTOCOL  *RemainingDevicePath;
  EFI_DEVICE_PATH_PROTOCOL  *Next;
  EFI_HANDLE                Handle;
  EFI_HANDLE                PreviousHandle;
  UINTN                     Size;

  if (DevicePathToConnect == NULL) {
    return EFI_SUCCESS;
  }

  DevicePath        = DuplicateDevicePath (DevicePathToConnect);
  CopyOfDevicePath  = DevicePath;
  if (DevicePath == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  do {
    //
    // The outer loop handles multi instance device paths.
    // Only console variables contain multiple instance device paths.
    //
    // After this call DevicePath points to the next Instance
    //
    Instance  = GetNextDevicePathInstance (&DevicePath, &Size);
    Next      = Instance;
    while (!IsDevicePathEndType (Next)) {
      Next = NextDevicePathNode (Next);
    }

    SetDevicePathEndNode (Next);

    //
    // Start the real work of connect with RemainingDevicePath
    //
    PreviousHandle = NULL;
    do {
      //
      // Find the handle that best matches the Device Path. If it is only a
      // partial match the remaining part of the device path is returned in
      // RemainingDevicePath.
      //
      RemainingDevicePath = Instance;
      Status              = gBS->LocateDevicePath (&gEfiDevicePathProtocolGuid, &RemainingDevicePath, &Handle);

      if (!EFI_ERROR (Status)) {
        if (Handle == PreviousHandle) {
          //
          // If no forward progress is made try invoking the Dispatcher.
          // A new FV may have been added to the system an new drivers
          // may now be found.
          // Status == EFI_SUCCESS means a driver was dispatched
          // Status == EFI_NOT_FOUND means no new drivers were dispatched
          //
          Status = gDS->Dispatch ();
        }

        if (!EFI_ERROR (Status)) {
          PreviousHandle = Handle;
          //
          // Connect all drivers that apply to Handle and RemainingDevicePath,
          // the Recursive flag is FALSE so only one level will be expanded.
          //
          // Do not check the connect status here, if the connect controller fail,
          // then still give the chance to do dispatch, because partial
          // RemainingDevicepath may be in the new FV
          //
          // 1. If the connect fail, RemainingDevicepath and handle will not
          //    change, so next time will do the dispatch, then dispatch's status
          //    will take effect
          // 2. If the connect success, the RemainingDevicepath and handle will
          //    change, then avoid the dispatch, we have chance to continue the
          //    next connection
          //
          gBS->ConnectController (Handle, NULL, RemainingDevicePath, FALSE);
        }
      }
      //
      // Loop until RemainingDevicePath is an empty device path
      //
    } while (!EFI_ERROR (Status) && !IsDevicePathEnd (RemainingDevicePath));

  } while (DevicePath != NULL);

  if (CopyOfDevicePath != NULL) {
    gBS->FreePool (CopyOfDevicePath);
  }
  //
  // All handle with DevicePath exists in the handle database
  //
  return Status;
}

EFI_STATUS
BdsLibConnectAllEfi (
  VOID
  )
/*++

Routine Description:

  This function will connect all current system handles recursively. The
  connection will finish until every handle's child handle created if it have.
  
Arguments:

  None

Returns:

  EFI_SUCCESS          - All handles and it's child handle have been connected
  
  EFI_STATUS           - Return the status of gBS->LocateHandleBuffer(). 

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

  Status = gBS->LocateHandleBuffer (
                  AllHandles,
                  NULL,
                  NULL,
                  &HandleCount,
                  &HandleBuffer
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  for (Index = 0; Index < HandleCount; Index++) {
    Status = gBS->ConnectController (HandleBuffer[Index], NULL, NULL, TRUE);
  }

  gBS->FreePool (HandleBuffer);

  return EFI_SUCCESS;
}

EFI_STATUS
BdsLibDisconnectAllEfi (
  VOID
  )
/*++

Routine Description:

  This function will disconnect all current system handles. The disconnection
  will finish until every handle have been disconnected.
  
Arguments:

  None

Returns:

  EFI_SUCCESS          - All handles have been disconnected
  
  EFI_STATUS           - Return the status of gBS->LocateHandleBuffer(). 

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

  //
  // Disconnect all
  //
  Status = gBS->LocateHandleBuffer (
                  AllHandles,
                  NULL,
                  NULL,
                  &HandleCount,
                  &HandleBuffer
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  for (Index = 0; Index < HandleCount; Index++) {
    Status = gBS->DisconnectController (HandleBuffer[Index], NULL, NULL);
  }

  gBS->FreePool (HandleBuffer);

  return EFI_SUCCESS;
}

VOID
BdsLibConnectAllDriversToAllControllers (
  VOID
  )
/*++

Routine Description:

  Connects all drivers to all controllers. 
  This function make sure all the current system driver will manage
  the correspoinding controllers if have. And at the same time, make
  sure all the system controllers have driver to manage it if have. 
  
Arguments:
  
  None
  
Returns:
  
  None
  
--*/
{
  EFI_STATUS  Status;

  do {
    //
    // Connect All EFI 1.10 drivers following EFI 1.10 algorithm
    //
    BdsLibConnectAllEfi ();

    //
    // Check to see if it's possible to dispatch an more DXE drivers.
    // The BdsLibConnectAllEfi () may have made new DXE drivers show up.
    // If anything is Dispatched Status == EFI_SUCCESS and we will try
    // the connect again.
    //
    Status = gDS->Dispatch ();

  } while (!EFI_ERROR (Status));

}