Nt32Pkg/WinNtBusDriverDxe/WinNtBusDriver.c

   1 /*+++
   2
   3 Copyright (c) 2006 - 2007, 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_GOP            - Builds GOP 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_GOP =
  80    <width> <height>[!...]
  81
  82    Declaring a two GOP windows with resolutions of 800x600 and 1024x768 would look like:
  83    Example : EFI_WIN_NT_GOP=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 //
 101 // The package level header files this module uses
 102 //
 103 #include <Uefi.h>
 104 #include <WinNtDxe.h>
 105 //
 106 // The protocols, PPI and GUID defintions for this module
 107 //
 108 #include <Protocol/WinNtThunk.h>
 109 #include <Protocol/WinNtIo.h>
 110 #include <Protocol/ComponentName.h>
 111 #include <Protocol/DriverBinding.h>
 112 #include <Protocol/DevicePath.h>
 113 //
 114 // The Library classes this module consumes
 115 //
 116 #include <Library/DebugLib.h>
 117 #include <Library/BaseLib.h>
 118 #include <Library/UefiDriverEntryPoint.h>
 119 #include <Library/UefiLib.h>
 120 #include <Library/PcdLib.h>
 121 #include <Library/BaseMemoryLib.h>
 122 #include <Library/UefiBootServicesTableLib.h>
 123 #include <Library/DevicePathLib.h>
 124 #include <Library/MemoryAllocationLib.h>
 125
 126 #include "WinNtBusDriver.h"
 127
 128 extern EFI_GUID gWinNtBusDriverGuid;
 129 //
 130 // DriverBinding protocol global
 131 //
 132 EFI_DRIVER_BINDING_PROTOCOL           gWinNtBusDriverBinding = {
 133   WinNtBusDriverBindingSupported,
 134   WinNtBusDriverBindingStart,
 135   WinNtBusDriverBindingStop,
 136   0xa,
 137   NULL,
 138   NULL
 139 };
 140
 141 #define NT_PCD_ARRAY_SIZE (sizeof(mPcdEnvironment)/sizeof(NT_PCD_ENTRY))
 142
 143 //
 144 // Table to map NT Environment variable to the GUID that should be in
 145 // device path.
 146 //
 147 static NT_PCD_ENTRY  mPcdEnvironment[] = {
 148   PcdToken(PcdWinNtConsole),       &gEfiWinNtConsoleGuid,
 149   PcdToken(PcdWinNtGop),           &gEfiWinNtGopGuid,
 150   PcdToken(PcdWinNtSerialPort),    &gEfiWinNtSerialPortGuid,
 151   PcdToken(PcdWinNtFileSystem),    &gEfiWinNtFileSystemGuid,
 152   PcdToken(PcdWinNtVirtualDisk),   &gEfiWinNtVirtualDisksGuid,
 153   PcdToken(PcdWinNtPhysicalDisk),  &gEfiWinNtPhysicalDisksGuid
 154 };
 155
 156 /**
 157   The user Entry Point for module WinNtBusDriver. The user code starts with this function.
 158
 159   @param[in] ImageHandle    The firmware allocated handle for the EFI image.
 160   @param[in] SystemTable    A pointer to the EFI System Table.
 161
 162   @retval EFI_SUCCESS       The entry point is executed successfully.
 163   @retval other             Some error occurs when executing this entry point.
 164
 165 **/
 166 EFI_STATUS
 167 EFIAPI
 168 InitializeWinNtBusDriver(
 169   IN EFI_HANDLE           ImageHandle,
 170   IN EFI_SYSTEM_TABLE     *SystemTable
 171   )
 172 {
 173   EFI_STATUS              Status;
 174
 175   //
 176   // Install driver model protocol(s).
 177   //
 178   Status = EfiLibInstallDriverBindingComponentName2 (
 179              ImageHandle,
 180              SystemTable,
 181              &gWinNtBusDriverBinding,
 182              ImageHandle,
 183              &gWinNtBusDriverComponentName,
 184              &gWinNtBusDriverComponentName2
 185              );
 186   ASSERT_EFI_ERROR (Status);
 187
 188
 189   return Status;
 190 }
 191
 192 VOID *
 193 AllocateMemory (
 194   IN  UINTN   Size
 195   )
 196 {
 197   VOID        *Buffer;
 198
 199   Buffer = AllocatePool (Size);
 200   ASSERT (Buffer != NULL);
 201
 202   return Buffer;
 203 }
 204
 205
 206 EFI_STATUS
 207 EFIAPI
 208 WinNtBusDriverBindingSupported (
 209   IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
 210   IN  EFI_HANDLE                   ControllerHandle,
 211   IN  EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
 212   )
 213 /*++
 214
 215 Routine Description:
 216
 217 Arguments:
 218
 219 Returns:
 220
 221   None
 222
 223 --*/
 224 // TODO:    This - add argument and description to function comment
 225 // TODO:    ControllerHandle - add argument and description to function comment
 226 // TODO:    RemainingDevicePath - add argument and description to function comment
 227 // TODO:    EFI_UNSUPPORTED - add return value to function comment
 228 // TODO:    EFI_UNSUPPORTED - add return value to function comment
 229 // TODO:    EFI_SUCCESS - add return value to function comment
 230 // TODO:    EFI_SUCCESS - add return value to function comment
 231 {
 232   EFI_STATUS                Status;
 233   EFI_DEVICE_PATH_PROTOCOL  *ParentDevicePath;
 234   EFI_WIN_NT_THUNK_PROTOCOL *WinNtThunk;
 235   UINTN                     Index;
 236
 237   //
 238   // Check the contents of the first Device Path Node of RemainingDevicePath to make sure
 239   // it is a legal Device Path Node for this bus driver's children.
 240   //
 241   if (RemainingDevicePath != NULL) {
 242     if (RemainingDevicePath->Type != HARDWARE_DEVICE_PATH ||
 243         RemainingDevicePath->SubType != HW_VENDOR_DP ||
 244         DevicePathNodeLength(RemainingDevicePath) != sizeof(WIN_NT_VENDOR_DEVICE_PATH_NODE)) {
 245       return EFI_UNSUPPORTED;
 246     }
 247
 248     for (Index = 0; Index < NT_PCD_ARRAY_SIZE; Index++) {
 249       if (CompareGuid (&((VENDOR_DEVICE_PATH *) RemainingDevicePath)->Guid, mPcdEnvironment[Index].DevicePathGuid)) {
 250         break;
 251       }
 252     }
 253
 254     if (Index >= NT_PCD_ARRAY_SIZE) {
 255       return EFI_UNSUPPORTED;
 256     }
 257   }
 258
 259   //
 260   // Open the IO Abstraction(s) needed to perform the supported test
 261   //
 262   Status = gBS->OpenProtocol (
 263                   ControllerHandle,
 264                   &gEfiDevicePathProtocolGuid,
 265                   &ParentDevicePath,
 266                   This->DriverBindingHandle,
 267                   ControllerHandle,
 268                   EFI_OPEN_PROTOCOL_BY_DRIVER
 269                   );
 270   if (Status == EFI_ALREADY_STARTED) {
 271     return EFI_SUCCESS;
 272   }
 273
 274   if (EFI_ERROR (Status)) {
 275     return Status;
 276   }
 277
 278   gBS->CloseProtocol (
 279         ControllerHandle,
 280         &gEfiDevicePathProtocolGuid,
 281         This->DriverBindingHandle,
 282         ControllerHandle
 283         );
 284
 285   Status = gBS->OpenProtocol (
 286                   ControllerHandle,
 287                   &gEfiWinNtThunkProtocolGuid,
 288                   &WinNtThunk,
 289                   This->DriverBindingHandle,
 290                   ControllerHandle,
 291                   EFI_OPEN_PROTOCOL_BY_DRIVER
 292                   );
 293   if (Status == EFI_ALREADY_STARTED) {
 294     return EFI_SUCCESS;
 295   }
 296
 297   if (EFI_ERROR (Status)) {
 298     return Status;
 299   }
 300
 301   //
 302   // Since we call through WinNtThunk we need to make sure it's valid
 303   //
 304   Status = EFI_SUCCESS;
 305   if (WinNtThunk->Signature != EFI_WIN_NT_THUNK_PROTOCOL_SIGNATURE) {
 306     Status = EFI_UNSUPPORTED;
 307   }
 308
 309   //
 310   // Close the I/O Abstraction(s) used to perform the supported test
 311   //
 312   gBS->CloseProtocol (
 313         ControllerHandle,
 314         &gEfiWinNtThunkProtocolGuid,
 315         This->DriverBindingHandle,
 316         ControllerHandle
 317         );
 318
 319   return Status;
 320 }
 321
 322 EFI_STATUS
 323 EFIAPI
 324 WinNtBusDriverBindingStart (
 325   IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
 326   IN  EFI_HANDLE                   ControllerHandle,
 327   IN  EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
 328   )
 329 /*++
 330
 331 Routine Description:
 332
 333 Arguments:
 334
 335 Returns:
 336
 337   None
 338
 339 --*/
 340 // TODO:    This - add argument and description to function comment
 341 // TODO:    ControllerHandle - add argument and description to function comment
 342 // TODO:    RemainingDevicePath - add argument and description to function comment
 343 // TODO:    EFI_OUT_OF_RESOURCES - add return value to function comment
 344 // TODO:    EFI_OUT_OF_RESOURCES - add return value to function comment
 345 // TODO:    EFI_SUCCESS - add return value to function comment
 346 {
 347   EFI_STATUS                      Status;
 348   EFI_STATUS                      InstallStatus;
 349   EFI_WIN_NT_THUNK_PROTOCOL       *WinNtThunk;
 350   EFI_DEVICE_PATH_PROTOCOL        *ParentDevicePath;
 351   WIN_NT_BUS_DEVICE               *WinNtBusDevice;
 352   WIN_NT_IO_DEVICE                *WinNtDevice;
 353   UINTN                           Index;
 354   CHAR16                          *StartString;
 355   CHAR16                          *SubString;
 356   UINT16                          Count;
 357   UINTN                           StringSize;
 358   UINT16                          ComponentName[MAX_NT_ENVIRNMENT_VARIABLE_LENGTH];
 359   WIN_NT_VENDOR_DEVICE_PATH_NODE  *Node;
 360   BOOLEAN                         CreateDevice;
 361   CHAR16                          *TempStr;
 362   CHAR16                          *PcdTempStr;
 363   UINTN                           TempStrSize;
 364
 365   Status = EFI_UNSUPPORTED;
 366
 367   //
 368   // Grab the protocols we need
 369   //
 370   Status = gBS->OpenProtocol (
 371                   ControllerHandle,
 372                   &gEfiDevicePathProtocolGuid,
 373                   &ParentDevicePath,
 374                   This->DriverBindingHandle,
 375                   ControllerHandle,
 376                   EFI_OPEN_PROTOCOL_BY_DRIVER
 377                   );
 378   if (EFI_ERROR (Status) && Status != EFI_ALREADY_STARTED) {
 379     return Status;
 380   }
 381
 382   Status = gBS->OpenProtocol (
 383                   ControllerHandle,
 384                   &gEfiWinNtThunkProtocolGuid,
 385                   &WinNtThunk,
 386                   This->DriverBindingHandle,
 387                   ControllerHandle,
 388                   EFI_OPEN_PROTOCOL_BY_DRIVER
 389                   );
 390   if (EFI_ERROR (Status) && Status != EFI_ALREADY_STARTED) {
 391     return Status;
 392   }
 393
 394   if (Status != EFI_ALREADY_STARTED) {
 395     WinNtBusDevice = AllocatePool (sizeof (WIN_NT_BUS_DEVICE));
 396     if (WinNtBusDevice == NULL) {
 397       return EFI_OUT_OF_RESOURCES;
 398     }
 399
 400     WinNtBusDevice->Signature           = WIN_NT_BUS_DEVICE_SIGNATURE;
 401     WinNtBusDevice->ControllerNameTable = NULL;
 402
 403     AddUnicodeString2 (
 404       "eng",
 405       gWinNtBusDriverComponentName.SupportedLanguages,
 406       &WinNtBusDevice->ControllerNameTable,
 407       L"Windows Bus Controller",
 408       TRUE
 409       );
 410     AddUnicodeString2 (
 411       "en",
 412       gWinNtBusDriverComponentName2.SupportedLanguages,
 413       &WinNtBusDevice->ControllerNameTable,
 414       L"Windows Bus Controller",
 415       FALSE
 416       );
 417
 418
 419     Status = gBS->InstallMultipleProtocolInterfaces (
 420                     &ControllerHandle,
 421                     &gWinNtBusDriverGuid,
 422                     WinNtBusDevice,
 423                     NULL
 424                     );
 425     if (EFI_ERROR (Status)) {
 426       FreeUnicodeStringTable (WinNtBusDevice->ControllerNameTable);
 427       FreePool (WinNtBusDevice);
 428       return Status;
 429     }
 430   }
 431
 432   //
 433   // Loop on the Variable list. Parse each variable to produce a set of handles that
 434   // represent virtual hardware devices.
 435   //
 436   InstallStatus   = EFI_NOT_FOUND;
 437   for (Index = 0; Index < NT_PCD_ARRAY_SIZE; Index++) {
 438     PcdTempStr = (VOID *)LibPcdGetPtr (mPcdEnvironment[Index].Token);
 439     ASSERT (PcdTempStr != NULL);
 440
 441     TempStrSize = StrLen (PcdTempStr);
 442     TempStr = AllocateMemory ((TempStrSize * sizeof (CHAR16)) + 1);
 443     StrCpy (TempStr, PcdTempStr);
 444
 445     StartString = TempStr;
 446
 447     //
 448     // Parse the envirnment variable into sub strings using '!' as a delimator.
 449     // Each substring needs it's own handle to be added to the system. This code
 450     // does not understand the sub string. Thats the device drivers job.
 451     //
 452     Count = 0;
 453     while (*StartString != '\0') {
 454
 455       //
 456       // Find the end of the sub string
 457       //
 458       SubString = StartString;
 459       while (*SubString != '\0' && *SubString != '!') {
 460         SubString++;
 461       }
 462
 463       if (*SubString == '!') {
 464         //
 465         // Replace token with '\0' to make sub strings. If this is the end
 466         //  of the string SubString will already point to NULL.
 467         //
 468         *SubString = '\0';
 469         SubString++;
 470       }
 471
 472       CreateDevice = TRUE;
 473       if (RemainingDevicePath != NULL) {
 474         CreateDevice  = FALSE;
 475         Node          = (WIN_NT_VENDOR_DEVICE_PATH_NODE *) RemainingDevicePath;
 476         if (Node->VendorDevicePath.Header.Type == HARDWARE_DEVICE_PATH &&
 477             Node->VendorDevicePath.Header.SubType == HW_VENDOR_DP &&
 478             DevicePathNodeLength (&Node->VendorDevicePath.Header) == sizeof (WIN_NT_VENDOR_DEVICE_PATH_NODE)
 479             ) {
 480           if (CompareGuid (&Node->VendorDevicePath.Guid, mPcdEnvironment[Index].DevicePathGuid) &&
 481               Node->Instance == Count
 482               ) {
 483             CreateDevice = TRUE;
 484           }
 485         }
 486       }
 487
 488       if (CreateDevice) {
 489
 490         //
 491         // Allocate instance structure, and fill in parent information.
 492         //
 493         WinNtDevice = AllocateMemory (sizeof (WIN_NT_IO_DEVICE));
 494         if (WinNtDevice == NULL) {
 495           return EFI_OUT_OF_RESOURCES;
 496         }
 497
 498         WinNtDevice->Handle             = NULL;
 499         WinNtDevice->ControllerHandle   = ControllerHandle;
 500         WinNtDevice->ParentDevicePath   = ParentDevicePath;
 501
 502         WinNtDevice->WinNtIo.WinNtThunk = WinNtThunk;
 503
 504         //
 505         // Plus 2 to account for the NULL at the end of the Unicode string
 506         //
 507         StringSize = (UINTN) ((UINT8 *) SubString - (UINT8 *) StartString) + sizeof (CHAR16);
 508         WinNtDevice->WinNtIo.EnvString = AllocateMemory (StringSize);
 509         if (WinNtDevice->WinNtIo.EnvString != NULL) {
 510           CopyMem (WinNtDevice->WinNtIo.EnvString, StartString, StringSize);
 511         }
 512
 513         WinNtDevice->ControllerNameTable = NULL;
 514
 515         WinNtThunk->SPrintf (ComponentName, sizeof (ComponentName), L"%s", WinNtDevice->WinNtIo.EnvString);
 516
 517         WinNtDevice->DevicePath = WinNtBusCreateDevicePath (
 518                                     ParentDevicePath,
 519                                     mPcdEnvironment[Index].DevicePathGuid,
 520                                     Count
 521                                     );
 522         if (WinNtDevice->DevicePath == NULL) {
 523           FreePool (WinNtDevice);
 524           return EFI_OUT_OF_RESOURCES;
 525         }
 526
 527         AddUnicodeString2 (
 528           "eng",
 529           gWinNtBusDriverComponentName.SupportedLanguages,
 530           &WinNtDevice->ControllerNameTable,
 531           ComponentName,
 532           TRUE
 533           );
 534         AddUnicodeString2 (
 535           "en",
 536           gWinNtBusDriverComponentName2.SupportedLanguages,
 537           &WinNtDevice->ControllerNameTable,
 538           ComponentName,
 539           FALSE
 540           );
 541
 542
 543         WinNtDevice->WinNtIo.TypeGuid       = mPcdEnvironment[Index].DevicePathGuid;
 544         WinNtDevice->WinNtIo.InstanceNumber = Count;
 545
 546         WinNtDevice->Signature              = WIN_NT_IO_DEVICE_SIGNATURE;
 547
 548         Status = gBS->InstallMultipleProtocolInterfaces (
 549                         &WinNtDevice->Handle,
 550                         &gEfiDevicePathProtocolGuid,
 551                         WinNtDevice->DevicePath,
 552                         &gEfiWinNtIoProtocolGuid,
 553                         &WinNtDevice->WinNtIo,
 554                         NULL
 555                         );
 556         if (EFI_ERROR (Status)) {
 557           FreeUnicodeStringTable (WinNtDevice->ControllerNameTable);
 558           FreePool (WinNtDevice);
 559         } else {
 560           //
 561           // Open For Child Device
 562           //
 563           Status = gBS->OpenProtocol (
 564                           ControllerHandle,
 565                           &gEfiWinNtThunkProtocolGuid,
 566                           &WinNtThunk,
 567                           This->DriverBindingHandle,
 568                           WinNtDevice->Handle,
 569                           EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
 570                           );
 571           if (!EFI_ERROR (Status)) {
 572             InstallStatus = EFI_SUCCESS;
 573           }
 574         }
 575       }
 576
 577       //
 578       // Parse Next sub string. This will point to '\0' if we are at the end.
 579       //
 580       Count++;
 581       StartString = SubString;
 582     }
 583
 584     FreePool (TempStr);
 585   }
 586
 587   return EFI_SUCCESS;
 588 }
 589
 590
 591 EFI_STATUS
 592 EFIAPI
 593 WinNtBusDriverBindingStop (
 594   IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
 595   IN  EFI_HANDLE                   ControllerHandle,
 596   IN  UINTN                        NumberOfChildren,
 597   IN  EFI_HANDLE                   *ChildHandleBuffer
 598   )
 599 /*++
 600
 601 Routine Description:
 602
 603 Arguments:
 604
 605 Returns:
 606
 607     None
 608
 609 --*/
 610 // TODO:    This - add argument and description to function comment
 611 // TODO:    ControllerHandle - add argument and description to function comment
 612 // TODO:    NumberOfChildren - add argument and description to function comment
 613 // TODO:    ChildHandleBuffer - add argument and description to function comment
 614 // TODO:    EFI_SUCCESS - add return value to function comment
 615 // TODO:    EFI_DEVICE_ERROR - add return value to function comment
 616 // TODO:    EFI_SUCCESS - add return value to function comment
 617 {
 618   EFI_STATUS                Status;
 619   UINTN                     Index;
 620   BOOLEAN                   AllChildrenStopped;
 621   EFI_WIN_NT_IO_PROTOCOL    *WinNtIo;
 622   WIN_NT_BUS_DEVICE         *WinNtBusDevice;
 623   WIN_NT_IO_DEVICE          *WinNtDevice;
 624   EFI_WIN_NT_THUNK_PROTOCOL *WinNtThunk;
 625
 626   //
 627   // Complete all outstanding transactions to Controller.
 628   // Don't allow any new transaction to Controller to be started.
 629   //
 630
 631   if (NumberOfChildren == 0) {
 632     //
 633     // Close the bus driver
 634     //
 635     Status = gBS->OpenProtocol (
 636                     ControllerHandle,
 637                     &gWinNtBusDriverGuid,
 638                     &WinNtBusDevice,
 639                     This->DriverBindingHandle,
 640                     ControllerHandle,
 641                     EFI_OPEN_PROTOCOL_GET_PROTOCOL
 642                     );
 643     if (EFI_ERROR (Status)) {
 644       return Status;
 645     }
 646
 647     gBS->UninstallMultipleProtocolInterfaces (
 648           ControllerHandle,
 649           &gWinNtBusDriverGuid,
 650           WinNtBusDevice,
 651           NULL
 652           );
 653
 654     FreeUnicodeStringTable (WinNtBusDevice->ControllerNameTable);
 655
 656     FreePool (WinNtBusDevice);
 657
 658     gBS->CloseProtocol (
 659           ControllerHandle,
 660           &gEfiWinNtThunkProtocolGuid,
 661           This->DriverBindingHandle,
 662           ControllerHandle
 663           );
 664
 665     gBS->CloseProtocol (
 666           ControllerHandle,
 667           &gEfiDevicePathProtocolGuid,
 668           This->DriverBindingHandle,
 669           ControllerHandle
 670           );
 671     return EFI_SUCCESS;
 672   }
 673
 674   AllChildrenStopped = TRUE;
 675
 676   for (Index = 0; Index < NumberOfChildren; Index++) {
 677
 678     Status = gBS->OpenProtocol (
 679                     ChildHandleBuffer[Index],
 680                     &gEfiWinNtIoProtocolGuid,
 681                     &WinNtIo,
 682                     This->DriverBindingHandle,
 683                     ControllerHandle,
 684                     EFI_OPEN_PROTOCOL_GET_PROTOCOL
 685                     );
 686     if (!EFI_ERROR (Status)) {
 687
 688       WinNtDevice = WIN_NT_IO_DEVICE_FROM_THIS (WinNtIo);
 689
 690       Status = gBS->CloseProtocol (
 691                       ControllerHandle,
 692                       &gEfiWinNtThunkProtocolGuid,
 693                       This->DriverBindingHandle,
 694                       WinNtDevice->Handle
 695                       );
 696
 697       Status = gBS->UninstallMultipleProtocolInterfaces (
 698                       WinNtDevice->Handle,
 699                       &gEfiDevicePathProtocolGuid,
 700                       WinNtDevice->DevicePath,
 701                       &gEfiWinNtIoProtocolGuid,
 702                       &WinNtDevice->WinNtIo,
 703                       NULL
 704                       );
 705
 706       if (EFI_ERROR (Status)) {
 707         gBS->OpenProtocol (
 708               ControllerHandle,
 709               &gEfiWinNtThunkProtocolGuid,
 710               (VOID **) &WinNtThunk,
 711               This->DriverBindingHandle,
 712               WinNtDevice->Handle,
 713               EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
 714               );
 715       } else {
 716         //
 717         // Close the child handle
 718         //
 719         FreeUnicodeStringTable (WinNtDevice->ControllerNameTable);
 720         FreePool (WinNtDevice);
 721       }
 722     }
 723
 724     if (EFI_ERROR (Status)) {
 725       AllChildrenStopped = FALSE;
 726     }
 727   }
 728
 729   if (!AllChildrenStopped) {
 730     return EFI_DEVICE_ERROR;
 731   }
 732
 733   return EFI_SUCCESS;
 734 }
 735
 736 EFI_DEVICE_PATH_PROTOCOL *
 737 WinNtBusCreateDevicePath (
 738   IN  EFI_DEVICE_PATH_PROTOCOL  *RootDevicePath,
 739   IN  EFI_GUID                  *Guid,
 740   IN  UINT16                    InstanceNumber
 741   )
 742 /*++
 743
 744 Routine Description:
 745   Create a device path node using Guid and InstanceNumber and append it to
 746   the passed in RootDevicePath
 747
 748 Arguments:
 749   RootDevicePath - Root of the device path to return.
 750
 751   Guid           - GUID to use in vendor device path node.
 752
 753   InstanceNumber - Instance number to use in the vendor device path. This
 754                     argument is needed to make sure each device path is unique.
 755
 756 Returns:
 757
 758   EFI_DEVICE_PATH_PROTOCOL
 759
 760 --*/
 761 {
 762   WIN_NT_VENDOR_DEVICE_PATH_NODE  DevicePath;
 763
 764   DevicePath.VendorDevicePath.Header.Type     = HARDWARE_DEVICE_PATH;
 765   DevicePath.VendorDevicePath.Header.SubType  = HW_VENDOR_DP;
 766   SetDevicePathNodeLength (&DevicePath.VendorDevicePath.Header, sizeof (WIN_NT_VENDOR_DEVICE_PATH_NODE));
 767
 768   //
 769   // The GUID defines the Class
 770   //
 771   CopyMem (&DevicePath.VendorDevicePath.Guid, Guid, sizeof (EFI_GUID));
 772
 773   //
 774   // Add an instance number so we can make sure there are no Device Path
 775   // duplication.
 776   //
 777   DevicePath.Instance = InstanceNumber;
 778
 779   return AppendDevicePathNode (
 780           RootDevicePath,
 781           (EFI_DEVICE_PATH_PROTOCOL *) &DevicePath
 782           );
 783 }