EdkNt32Pkg/Dxe/WinNtThunk/Bus/WinNtBusDriver/WinNtBusDriver.c

   1 /*+++
   2
   3 Copyright (c) 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   WinNtBusDriver.c
  15
  16 Abstract:
  17
  18 This following section documents the envirnoment variables for the Win NT
  19 build.  These variables are used to define the (virtual) hardware
  20 configuration of the NT environment
  21
  22 A ! can be used to seperate multiple instances in a variable. Each
  23 instance represents a seperate hardware device.
  24
  25 EFI_WIN_NT_PHYSICAL_DISKS - maps to drives on your system
  26 EFI_WIN_NT_VIRTUAL_DISKS  - maps to a device emulated by a file
  27 EFI_WIN_NT_FILE_SYSTEM    - mouts a directory as a file system
  28 EFI_WIN_NT_CONSOLE        - make a logical comand line window (only one!)
  29 EFI_WIN_NT_UGA            - Builds UGA Windows of Width and Height
  30 EFI_WIN_NT_SERIAL_PORT    - maps physical serial ports
  31
  32  <F>ixed       - Fixed disk like a hard drive.
  33  <R>emovable   - Removable media like a floppy or CD-ROM.
  34  Read <O>nly   - Write protected device.
  35  Read <W>rite  - Read write device.
  36  <block count> - Decimal number of blocks a device supports.
  37  <block size>  - Decimal number of bytes per block.
  38
  39  NT envirnonment variable contents. '<' and '>' are not part of the variable,
  40  they are just used to make this help more readable. There should be no
  41  spaces between the ';'. Extra spaces will break the variable. A '!' is
  42  used to seperate multiple devices in a variable.
  43
  44  EFI_WIN_NT_VIRTUAL_DISKS =
  45    <F | R><O | W>;<block count>;<block size>[!...]
  46
  47  EFI_WIN_NT_PHYSICAL_DISKS =
  48    <drive letter>:<F | R><O | W>;<block count>;<block size>[!...]
  49
  50  Virtual Disks: These devices use a file to emulate a hard disk or removable
  51                 media device.
  52
  53    Thus a 20 MB emulated hard drive would look like:
  54    EFI_WIN_NT_VIRTUAL_DISKS=FW;40960;512
  55
  56    A 1.44MB emulated floppy with a block size of 1024 would look like:
  57    EFI_WIN_NT_VIRTUAL_DISKS=RW;1440;1024
  58
  59  Physical Disks: These devices use NT to open a real device in your system
  60
  61    Thus a 120 MB floppy would look like:
  62    EFI_WIN_NT_PHYSICAL_DISKS=B:RW;245760;512
  63
  64    Thus a standard CD-ROM floppy would look like:
  65    EFI_WIN_NT_PHYSICAL_DISKS=Z:RO;307200;2048
  66
  67  EFI_WIN_NT_FILE_SYSTEM =
  68    <directory path>[!...]
  69
  70    Mounting the two directories C:\FOO and C:\BAR would look like:
  71    EFI_WIN_NT_FILE_SYSTEM=c:\foo!c:\bar
  72
  73  EFI_WIN_NT_CONSOLE =
  74    <window title>
  75
  76    Declaring a text console window with the title "My EFI Console" woild look like:
  77    EFI_WIN_NT_CONSOLE=My EFI Console
  78
  79  EFI_WIN_NT_UGA =
  80    <width> <height>[!...]
  81
  82    Declaring a two UGA windows with resolutions of 800x600 and 1024x768 would look like:
  83    Example : EFI_WIN_NT_UGA=800 600!1024 768
  84
  85  EFI_WIN_NT_SERIAL_PORT =
  86    <port name>[!...]
  87
  88    Declaring two serial ports on COM1 and COM2 would look like:
  89    Example : EFI_WIN_NT_SERIAL_PORT=COM1!COM2
  90
  91  EFI_WIN_NT_PASS_THROUGH =
  92    <BaseAddress>;<Bus#>;<Device#>;<Function#>
  93
  94    Declaring a base address of 0xE0000000 (used for PCI Express devices)
  95    and having NT32 talk to a device located at bus 0, device 1, function 0:
  96    Example : EFI_WIN_NT_PASS_THROUGH=E000000;0;1;0
  97
  98 ---*/
  99
 100 #include "WinNtBusDriver.h"
 101 //#include "PciHostBridge.h"
 102
 103 //
 104 // Define GUID for the WinNt Bus Driver
 105 //
 106 static EFI_GUID gWinNtBusDriverGuid = {
 107   0x419f582, 0x625, 0x4531, 0x8a, 0x33, 0x85, 0xa9, 0x96, 0x5c, 0x95, 0xbc
 108 };
 109
 110 //
 111 // DriverBinding protocol global
 112 //
 113 EFI_DRIVER_BINDING_PROTOCOL           gWinNtBusDriverBinding = {
 114   WinNtBusDriverBindingSupported,
 115   WinNtBusDriverBindingStart,
 116   WinNtBusDriverBindingStop,
 117   0x10,
 118   NULL,
 119   NULL
 120 };
 121
 122 #define NT_PCD_ARRAY_SIZE (sizeof(mPcdEnvironment)/sizeof(NT_PCD_ENTRY))
 123
 124 //
 125 // Table to map NT Environment variable to the GUID that should be in
 126 // device path.
 127 //
 128 static NT_PCD_ENTRY  mPcdEnvironment[] = {
 129   PcdToken(PcdWinNtConsole),       &gEfiWinNtConsoleGuid,
 130   PcdToken(PcdWinNtUga),           &gEfiWinNtUgaGuid,
 131   PcdToken(PcdWinNtSerialPort),    &gEfiWinNtSerialPortGuid,
 132   PcdToken(PcdWinNtFileSystem),    &gEfiWinNtFileSystemGuid,
 133   PcdToken(PcdWinNtVirtualDisk),   &gEfiWinNtVirtualDisksGuid,
 134   PcdToken(PcdWinNtPhysicalDisk),  &gEfiWinNtPhysicalDisksGuid,
 135   PcdToken(PcdWinNtCpuModel),      &gEfiWinNtCPUModelGuid,
 136   PcdToken(PcdWinNtCpuSpeed),      &gEfiWinNtCPUSpeedGuid,
 137   PcdToken(PcdWinNtMemorySize),    &gEfiWinNtMemoryGuid
 138 };
 139
 140 VOID *
 141 AllocateMemory (
 142   IN  UINTN   Size
 143   )
 144 {
 145   EFI_STATUS  Status;
 146   VOID        *Buffer;
 147
 148   Status = gBS->AllocatePool (
 149                   EfiBootServicesData,
 150                   Size,
 151                   (VOID *)&Buffer
 152                   );
 153   if (EFI_ERROR (Status)) {
 154     ASSERT (FALSE);
 155     return NULL;
 156   }
 157   return Buffer;
 158 }
 159
 160
 161 EFI_STATUS
 162 EFIAPI
 163 WinNtBusDriverBindingSupported (
 164   IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
 165   IN  EFI_HANDLE                   ControllerHandle,
 166   IN  EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
 167   )
 168 /*++
 169
 170 Routine Description:
 171
 172 Arguments:
 173
 174 Returns:
 175
 176   None
 177
 178 --*/
 179 // TODO:    This - add argument and description to function comment
 180 // TODO:    ControllerHandle - add argument and description to function comment
 181 // TODO:    RemainingDevicePath - add argument and description to function comment
 182 // TODO:    EFI_UNSUPPORTED - add return value to function comment
 183 // TODO:    EFI_UNSUPPORTED - add return value to function comment
 184 // TODO:    EFI_SUCCESS - add return value to function comment
 185 // TODO:    EFI_SUCCESS - add return value to function comment
 186 {
 187   EFI_STATUS                Status;
 188   EFI_DEVICE_PATH_PROTOCOL  *ParentDevicePath;
 189   EFI_WIN_NT_THUNK_PROTOCOL *WinNtThunk;
 190   UINTN                     Index;
 191
 192   //
 193   // Check the contents of the first Device Path Node of RemainingDevicePath to make sure
 194   // it is a legal Device Path Node for this bus driver's children.
 195   //
 196   if (RemainingDevicePath != NULL) {
 197     if (RemainingDevicePath->Type != HARDWARE_DEVICE_PATH ||
 198         RemainingDevicePath->SubType != HW_VENDOR_DP ||
 199         DevicePathNodeLength(RemainingDevicePath) != sizeof(WIN_NT_VENDOR_DEVICE_PATH_NODE)) {
 200       return EFI_UNSUPPORTED;
 201     }
 202
 203     for (Index = 0; Index < NT_PCD_ARRAY_SIZE; Index++) {
 204       if (CompareGuid (&((VENDOR_DEVICE_PATH *) RemainingDevicePath)->Guid, mPcdEnvironment[Index].DevicePathGuid)) {
 205         break;
 206       }
 207     }
 208
 209     if (Index >= NT_PCD_ARRAY_SIZE) {
 210       return EFI_UNSUPPORTED;
 211     }
 212   }
 213
 214   //
 215   // Open the IO Abstraction(s) needed to perform the supported test
 216   //
 217   Status = gBS->OpenProtocol (
 218                   ControllerHandle,
 219                   &gEfiDevicePathProtocolGuid,
 220                   &ParentDevicePath,
 221                   This->DriverBindingHandle,
 222                   ControllerHandle,
 223                   EFI_OPEN_PROTOCOL_BY_DRIVER
 224                   );
 225   if (Status == EFI_ALREADY_STARTED) {
 226     return EFI_SUCCESS;
 227   }
 228
 229   if (EFI_ERROR (Status)) {
 230     return Status;
 231   }
 232
 233   gBS->CloseProtocol (
 234         ControllerHandle,
 235         &gEfiDevicePathProtocolGuid,
 236         This->DriverBindingHandle,
 237         ControllerHandle
 238         );
 239
 240   Status = gBS->OpenProtocol (
 241                   ControllerHandle,
 242                   &gEfiWinNtThunkProtocolGuid,
 243                   &WinNtThunk,
 244                   This->DriverBindingHandle,
 245                   ControllerHandle,
 246                   EFI_OPEN_PROTOCOL_BY_DRIVER
 247                   );
 248   if (Status == EFI_ALREADY_STARTED) {
 249     return EFI_SUCCESS;
 250   }
 251
 252   if (EFI_ERROR (Status)) {
 253     return Status;
 254   }
 255
 256   //
 257   // Since we call through WinNtThunk we need to make sure it's valid
 258   //
 259   Status = EFI_SUCCESS;
 260   if (WinNtThunk->Signature != EFI_WIN_NT_THUNK_PROTOCOL_SIGNATURE) {
 261     Status = EFI_UNSUPPORTED;
 262   }
 263
 264   //
 265   // Close the I/O Abstraction(s) used to perform the supported test
 266   //
 267   gBS->CloseProtocol (
 268         ControllerHandle,
 269         &gEfiWinNtThunkProtocolGuid,
 270         This->DriverBindingHandle,
 271         ControllerHandle
 272         );
 273
 274   return Status;
 275 }
 276
 277 EFI_STATUS
 278 EFIAPI
 279 WinNtBusDriverBindingStart (
 280   IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
 281   IN  EFI_HANDLE                   ControllerHandle,
 282   IN  EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
 283   )
 284 /*++
 285
 286 Routine Description:
 287
 288 Arguments:
 289
 290 Returns:
 291
 292   None
 293
 294 --*/
 295 // TODO:    This - add argument and description to function comment
 296 // TODO:    ControllerHandle - add argument and description to function comment
 297 // TODO:    RemainingDevicePath - add argument and description to function comment
 298 // TODO:    EFI_OUT_OF_RESOURCES - add return value to function comment
 299 // TODO:    EFI_OUT_OF_RESOURCES - add return value to function comment
 300 // TODO:    EFI_SUCCESS - add return value to function comment
 301 {
 302   EFI_STATUS                      Status;
 303   EFI_STATUS                      InstallStatus;
 304   EFI_WIN_NT_THUNK_PROTOCOL       *WinNtThunk;
 305   EFI_DEVICE_PATH_PROTOCOL        *ParentDevicePath;
 306   WIN_NT_BUS_DEVICE               *WinNtBusDevice;
 307   WIN_NT_IO_DEVICE                *WinNtDevice;
 308   UINTN                           Index;
 309   CHAR16                          *StartString;
 310   CHAR16                          *SubString;
 311   UINT16                          Count;
 312   UINTN                           StringSize;
 313   UINT16                          ComponentName[MAX_NT_ENVIRNMENT_VARIABLE_LENGTH];
 314   WIN_NT_VENDOR_DEVICE_PATH_NODE  *Node;
 315   BOOLEAN                         CreateDevice;
 316   CHAR16                          *TempStr;
 317   CHAR16                          *PcdTempStr;
 318   UINTN                           TempStrSize;
 319
 320   Status = EFI_UNSUPPORTED;
 321
 322   //
 323   // Grab the protocols we need
 324   //
 325   Status = gBS->OpenProtocol (
 326                   ControllerHandle,
 327                   &gEfiDevicePathProtocolGuid,
 328                   &ParentDevicePath,
 329                   This->DriverBindingHandle,
 330                   ControllerHandle,
 331                   EFI_OPEN_PROTOCOL_BY_DRIVER
 332                   );
 333   if (EFI_ERROR (Status) && Status != EFI_ALREADY_STARTED) {
 334     return Status;
 335   }
 336
 337   Status = gBS->OpenProtocol (
 338                   ControllerHandle,
 339                   &gEfiWinNtThunkProtocolGuid,
 340                   &WinNtThunk,
 341                   This->DriverBindingHandle,
 342                   ControllerHandle,
 343                   EFI_OPEN_PROTOCOL_BY_DRIVER
 344                   );
 345   if (EFI_ERROR (Status) && Status != EFI_ALREADY_STARTED) {
 346     return Status;
 347   }
 348
 349   if (Status != EFI_ALREADY_STARTED) {
 350     Status = gBS->AllocatePool (
 351                     EfiBootServicesData,
 352                     sizeof (WIN_NT_BUS_DEVICE),
 353                     (VOID *) &WinNtBusDevice
 354                     );
 355     if (EFI_ERROR (Status)) {
 356       return Status;
 357     }
 358
 359     WinNtBusDevice->Signature           = WIN_NT_BUS_DEVICE_SIGNATURE;
 360     WinNtBusDevice->ControllerNameTable = NULL;
 361
 362     AddUnicodeString (
 363       "eng",
 364       gWinNtBusDriverComponentName.SupportedLanguages,
 365       &WinNtBusDevice->ControllerNameTable,
 366       L"Windows Bus Controller"
 367       );
 368
 369     Status = gBS->InstallMultipleProtocolInterfaces (
 370                     &ControllerHandle,
 371                     &gWinNtBusDriverGuid,
 372                     WinNtBusDevice,
 373                     NULL
 374                     );
 375     if (EFI_ERROR (Status)) {
 376       FreeUnicodeStringTable (WinNtBusDevice->ControllerNameTable);
 377       gBS->FreePool (WinNtBusDevice);
 378       return Status;
 379     }
 380   }
 381
 382   //
 383   // Loop on the Variable list. Parse each variable to produce a set of handles that
 384   // represent virtual hardware devices.
 385   //
 386   InstallStatus   = EFI_NOT_FOUND;
 387   for (Index = 0; Index < NT_PCD_ARRAY_SIZE; Index++) {
 388     PcdTempStr = (VOID *)LibPcdGetPtr (mPcdEnvironment[Index].Token);
 389     ASSERT (PcdTempStr != NULL);
 390
 391     TempStrSize = StrLen (PcdTempStr);
 392     TempStr = AllocateMemory ((TempStrSize * sizeof (CHAR16)) + 1);
 393     StrCpy (TempStr, PcdTempStr);
 394
 395     StartString = TempStr;
 396
 397     //
 398     // Parse the envirnment variable into sub strings using '!' as a delimator.
 399     // Each substring needs it's own handle to be added to the system. This code
 400     // does not understand the sub string. Thats the device drivers job.
 401     //
 402     Count = 0;
 403     while (*StartString != '\0') {
 404
 405       //
 406       // Find the end of the sub string
 407       //
 408       SubString = StartString;
 409       while (*SubString != '\0' && *SubString != '!') {
 410         SubString++;
 411       }
 412
 413       if (*SubString == '!') {
 414         //
 415         // Replace token with '\0' to make sub strings. If this is the end
 416         //  of the string SubString will already point to NULL.
 417         //
 418         *SubString = '\0';
 419         SubString++;
 420       }
 421
 422       CreateDevice = TRUE;
 423       if (RemainingDevicePath != NULL) {
 424         CreateDevice  = FALSE;
 425         Node          = (WIN_NT_VENDOR_DEVICE_PATH_NODE *) RemainingDevicePath;
 426         if (Node->VendorDevicePath.Header.Type == HARDWARE_DEVICE_PATH &&
 427             Node->VendorDevicePath.Header.SubType == HW_VENDOR_DP &&
 428             DevicePathNodeLength (&Node->VendorDevicePath.Header) == sizeof (WIN_NT_VENDOR_DEVICE_PATH_NODE)
 429             ) {
 430           if (CompareGuid (&Node->VendorDevicePath.Guid, mPcdEnvironment[Index].DevicePathGuid) &&
 431               Node->Instance == Count
 432               ) {
 433             CreateDevice = TRUE;
 434           }
 435         }
 436       }
 437
 438       if (CreateDevice) {
 439
 440         //
 441         // Allocate instance structure, and fill in parent information.
 442         //
 443         WinNtDevice = AllocateMemory (sizeof (WIN_NT_IO_DEVICE));
 444         if (WinNtDevice == NULL) {
 445           return EFI_OUT_OF_RESOURCES;
 446         }
 447
 448         WinNtDevice->Handle             = NULL;
 449         WinNtDevice->ControllerHandle   = ControllerHandle;
 450         WinNtDevice->ParentDevicePath   = ParentDevicePath;
 451
 452         WinNtDevice->WinNtIo.WinNtThunk = WinNtThunk;
 453
 454         //
 455         // Plus 2 to account for the NULL at the end of the Unicode string
 456         //
 457         StringSize = (UINTN) ((UINT8 *) SubString - (UINT8 *) StartString) + sizeof (CHAR16);
 458         WinNtDevice->WinNtIo.EnvString = AllocateMemory (StringSize);
 459         if (WinNtDevice->WinNtIo.EnvString != NULL) {
 460           CopyMem (WinNtDevice->WinNtIo.EnvString, StartString, StringSize);
 461         }
 462
 463         WinNtDevice->ControllerNameTable = NULL;
 464
 465         WinNtThunk->SPrintf (ComponentName, L"%s", WinNtDevice->WinNtIo.EnvString);
 466
 467         WinNtDevice->DevicePath = WinNtBusCreateDevicePath (
 468                                     ParentDevicePath,
 469                                     mPcdEnvironment[Index].DevicePathGuid,
 470                                     Count
 471                                     );
 472         if (WinNtDevice->DevicePath == NULL) {
 473           gBS->FreePool (WinNtDevice);
 474           return EFI_OUT_OF_RESOURCES;
 475         }
 476
 477         AddUnicodeString (
 478           "eng",
 479           gWinNtBusDriverComponentName.SupportedLanguages,
 480           &WinNtDevice->ControllerNameTable,
 481           ComponentName
 482           );
 483
 484         WinNtDevice->WinNtIo.TypeGuid       = mPcdEnvironment[Index].DevicePathGuid;
 485         WinNtDevice->WinNtIo.InstanceNumber = Count;
 486
 487         WinNtDevice->Signature              = WIN_NT_IO_DEVICE_SIGNATURE;
 488
 489         Status = gBS->InstallMultipleProtocolInterfaces (
 490                         &WinNtDevice->Handle,
 491                         &gEfiDevicePathProtocolGuid,
 492                         WinNtDevice->DevicePath,
 493                         &gEfiWinNtIoProtocolGuid,
 494                         &WinNtDevice->WinNtIo,
 495                         NULL
 496                         );
 497         if (EFI_ERROR (Status)) {
 498           FreeUnicodeStringTable (WinNtDevice->ControllerNameTable);
 499           gBS->FreePool (WinNtDevice);
 500         } else {
 501           //
 502           // Open For Child Device
 503           //
 504           Status = gBS->OpenProtocol (
 505                           ControllerHandle,
 506                           &gEfiWinNtThunkProtocolGuid,
 507                           &WinNtThunk,
 508                           This->DriverBindingHandle,
 509                           WinNtDevice->Handle,
 510                           EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
 511                           );
 512           if (!EFI_ERROR (Status)) {
 513             InstallStatus = EFI_SUCCESS;
 514           }
 515         }
 516       }
 517
 518       //
 519       // Parse Next sub string. This will point to '\0' if we are at the end.
 520       //
 521       Count++;
 522       StartString = SubString;
 523     }
 524
 525     gBS->FreePool (TempStr);
 526   }
 527
 528   return EFI_SUCCESS;
 529 }
 530
 531
 532 EFI_STATUS
 533 EFIAPI
 534 WinNtBusDriverBindingStop (
 535   IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
 536   IN  EFI_HANDLE                   ControllerHandle,
 537   IN  UINTN                        NumberOfChildren,
 538   IN  EFI_HANDLE                   *ChildHandleBuffer
 539   )
 540 /*++
 541
 542 Routine Description:
 543
 544 Arguments:
 545
 546 Returns:
 547
 548     None
 549
 550 --*/
 551 // TODO:    This - add argument and description to function comment
 552 // TODO:    ControllerHandle - add argument and description to function comment
 553 // TODO:    NumberOfChildren - add argument and description to function comment
 554 // TODO:    ChildHandleBuffer - add argument and description to function comment
 555 // TODO:    EFI_SUCCESS - add return value to function comment
 556 // TODO:    EFI_DEVICE_ERROR - add return value to function comment
 557 // TODO:    EFI_SUCCESS - add return value to function comment
 558 {
 559   EFI_STATUS                Status;
 560   UINTN                     Index;
 561   BOOLEAN                   AllChildrenStopped;
 562   EFI_WIN_NT_IO_PROTOCOL    *WinNtIo;
 563   WIN_NT_BUS_DEVICE         *WinNtBusDevice;
 564   WIN_NT_IO_DEVICE          *WinNtDevice;
 565   EFI_WIN_NT_THUNK_PROTOCOL *WinNtThunk;
 566
 567   //
 568   // Complete all outstanding transactions to Controller.
 569   // Don't allow any new transaction to Controller to be started.
 570   //
 571
 572   if (NumberOfChildren == 0) {
 573     //
 574     // Close the bus driver
 575     //
 576     Status = gBS->OpenProtocol (
 577                     ControllerHandle,
 578                     &gWinNtBusDriverGuid,
 579                     &WinNtBusDevice,
 580                     This->DriverBindingHandle,
 581                     ControllerHandle,
 582                     EFI_OPEN_PROTOCOL_GET_PROTOCOL
 583                     );
 584     if (EFI_ERROR (Status)) {
 585       return Status;
 586     }
 587
 588     gBS->UninstallMultipleProtocolInterfaces (
 589           ControllerHandle,
 590           &gWinNtBusDriverGuid,
 591           WinNtBusDevice,
 592           NULL
 593           );
 594
 595     FreeUnicodeStringTable (WinNtBusDevice->ControllerNameTable);
 596
 597     gBS->FreePool (WinNtBusDevice);
 598
 599     gBS->CloseProtocol (
 600           ControllerHandle,
 601           &gEfiWinNtThunkProtocolGuid,
 602           This->DriverBindingHandle,
 603           ControllerHandle
 604           );
 605
 606     gBS->CloseProtocol (
 607           ControllerHandle,
 608           &gEfiDevicePathProtocolGuid,
 609           This->DriverBindingHandle,
 610           ControllerHandle
 611           );
 612     return EFI_SUCCESS;
 613   }
 614
 615   AllChildrenStopped = TRUE;
 616
 617   for (Index = 0; Index < NumberOfChildren; Index++) {
 618
 619     Status = gBS->OpenProtocol (
 620                     ChildHandleBuffer[Index],
 621                     &gEfiWinNtIoProtocolGuid,
 622                     &WinNtIo,
 623                     This->DriverBindingHandle,
 624                     ControllerHandle,
 625                     EFI_OPEN_PROTOCOL_GET_PROTOCOL
 626                     );
 627     if (!EFI_ERROR (Status)) {
 628
 629       WinNtDevice = WIN_NT_IO_DEVICE_FROM_THIS (WinNtIo);
 630
 631       Status = gBS->CloseProtocol (
 632                       ControllerHandle,
 633                       &gEfiWinNtThunkProtocolGuid,
 634                       This->DriverBindingHandle,
 635                       WinNtDevice->Handle
 636                       );
 637
 638       Status = gBS->UninstallMultipleProtocolInterfaces (
 639                       WinNtDevice->Handle,
 640                       &gEfiDevicePathProtocolGuid,
 641                       WinNtDevice->DevicePath,
 642                       &gEfiWinNtIoProtocolGuid,
 643                       &WinNtDevice->WinNtIo,
 644                       NULL
 645                       );
 646
 647       if (EFI_ERROR (Status)) {
 648         gBS->OpenProtocol (
 649               ControllerHandle,
 650               &gEfiWinNtThunkProtocolGuid,
 651               (VOID **) &WinNtThunk,
 652               This->DriverBindingHandle,
 653               WinNtDevice->Handle,
 654               EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
 655               );
 656       } else {
 657         //
 658         // Close the child handle
 659         //
 660         FreeUnicodeStringTable (WinNtDevice->ControllerNameTable);
 661         gBS->FreePool (WinNtDevice);
 662       }
 663     }
 664
 665     if (EFI_ERROR (Status)) {
 666       AllChildrenStopped = FALSE;
 667     }
 668   }
 669
 670   if (!AllChildrenStopped) {
 671     return EFI_DEVICE_ERROR;
 672   }
 673
 674   return EFI_SUCCESS;
 675 }
 676
 677 EFI_DEVICE_PATH_PROTOCOL *
 678 WinNtBusCreateDevicePath (
 679   IN  EFI_DEVICE_PATH_PROTOCOL  *RootDevicePath,
 680   IN  EFI_GUID                  *Guid,
 681   IN  UINT16                    InstanceNumber
 682   )
 683 /*++
 684
 685 Routine Description:
 686   Create a device path node using Guid and InstanceNumber and append it to
 687   the passed in RootDevicePath
 688
 689 Arguments:
 690   RootDevicePath - Root of the device path to return.
 691
 692   Guid           - GUID to use in vendor device path node.
 693
 694   InstanceNumber - Instance number to use in the vendor device path. This
 695                     argument is needed to make sure each device path is unique.
 696
 697 Returns:
 698
 699   EFI_DEVICE_PATH_PROTOCOL
 700
 701 --*/
 702 {
 703   WIN_NT_VENDOR_DEVICE_PATH_NODE  DevicePath;
 704
 705   DevicePath.VendorDevicePath.Header.Type     = HARDWARE_DEVICE_PATH;
 706   DevicePath.VendorDevicePath.Header.SubType  = HW_VENDOR_DP;
 707   SetDevicePathNodeLength (&DevicePath.VendorDevicePath.Header, sizeof (WIN_NT_VENDOR_DEVICE_PATH_NODE));
 708
 709   //
 710   // The GUID defines the Class
 711   //
 712   CopyMem (&DevicePath.VendorDevicePath.Guid, Guid, sizeof (EFI_GUID));
 713
 714   //
 715   // Add an instance number so we can make sure there are no Device Path
 716   // duplication.
 717   //
 718   DevicePath.Instance = InstanceNumber;
 719
 720   return AppendDevicePathNode (
 721           RootDevicePath,
 722           (EFI_DEVICE_PATH_PROTOCOL *) &DevicePath
 723           );
 724 }