MdeModulePkg/Library/UefiBootManagerLib/BmBootDescription.c

   1 /** @file
   2   Library functions which relate with boot option description.
   3
   4 Copyright (c) 2011 - 2016, Intel Corporation. All rights reserved.<BR>
   5 (C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
   6 This program and the accompanying materials
   7 are licensed and made available under the terms and conditions of the BSD License
   8 which accompanies this distribution.  The full text of the license may be found at
   9 http://opensource.org/licenses/bsd-license.php
  10
  11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include "InternalBm.h"
  17
  18 #define VENDOR_IDENTIFICATION_OFFSET     3
  19 #define VENDOR_IDENTIFICATION_LENGTH     8
  20 #define PRODUCT_IDENTIFICATION_OFFSET    11
  21 #define PRODUCT_IDENTIFICATION_LENGTH    16
  22
  23 CONST UINT16 mBmUsbLangId    = 0x0409; // English
  24 CHAR16       mBmUefiPrefix[] = L"UEFI ";
  25
  26 LIST_ENTRY mPlatformBootDescriptionHandlers = INITIALIZE_LIST_HEAD_VARIABLE (mPlatformBootDescriptionHandlers);
  27
  28 /**
  29   For a bootable Device path, return its boot type.
  30
  31   @param  DevicePath        The bootable device Path to check
  32
  33   @retval AcpiFloppyBoot    If given device path contains ACPI_DEVICE_PATH type device path node
  34                             which HID is floppy device.
  35   @retval MessageAtapiBoot  If given device path contains MESSAGING_DEVICE_PATH type device path node
  36                             and its last device path node's subtype is MSG_ATAPI_DP.
  37   @retval MessageSataBoot   If given device path contains MESSAGING_DEVICE_PATH type device path node
  38                             and its last device path node's subtype is MSG_SATA_DP.
  39   @retval MessageScsiBoot   If given device path contains MESSAGING_DEVICE_PATH type device path node
  40                             and its last device path node's subtype is MSG_SCSI_DP.
  41   @retval MessageUsbBoot    If given device path contains MESSAGING_DEVICE_PATH type device path node
  42                             and its last device path node's subtype is MSG_USB_DP.
  43   @retval BmMiscBoot        If tiven device path doesn't match the above condition.
  44
  45 **/
  46 BM_BOOT_TYPE
  47 BmDevicePathType (
  48   IN  EFI_DEVICE_PATH_PROTOCOL     *DevicePath
  49   )
  50 {
  51   EFI_DEVICE_PATH_PROTOCOL      *Node;
  52   EFI_DEVICE_PATH_PROTOCOL      *NextNode;
  53
  54   ASSERT (DevicePath != NULL);
  55
  56   for (Node = DevicePath; !IsDevicePathEndType (Node); Node = NextDevicePathNode (Node)) {
  57     switch (DevicePathType (Node)) {
  58
  59       case ACPI_DEVICE_PATH:
  60         if (EISA_ID_TO_NUM (((ACPI_HID_DEVICE_PATH *) Node)->HID) == 0x0604) {
  61           return BmAcpiFloppyBoot;
  62         }
  63         break;
  64
  65       case HARDWARE_DEVICE_PATH:
  66         if (DevicePathSubType (Node) == HW_CONTROLLER_DP) {
  67           return BmHardwareDeviceBoot;
  68         }
  69         break;
  70
  71       case MESSAGING_DEVICE_PATH:
  72         //
  73         // Skip LUN device node
  74         //
  75         NextNode = Node;
  76         do {
  77           NextNode = NextDevicePathNode (NextNode);
  78         } while (
  79             (DevicePathType (NextNode) == MESSAGING_DEVICE_PATH) &&
  80             (DevicePathSubType(NextNode) == MSG_DEVICE_LOGICAL_UNIT_DP)
  81             );
  82
  83         //
  84         // If the device path not only point to driver device, it is not a messaging device path,
  85         //
  86         if (!IsDevicePathEndType (NextNode)) {
  87           continue;
  88         }
  89
  90         switch (DevicePathSubType (Node)) {
  91         case MSG_ATAPI_DP:
  92           return BmMessageAtapiBoot;
  93           break;
  94
  95         case MSG_SATA_DP:
  96           return BmMessageSataBoot;
  97           break;
  98
  99         case MSG_USB_DP:
 100           return BmMessageUsbBoot;
 101           break;
 102
 103         case MSG_SCSI_DP:
 104           return BmMessageScsiBoot;
 105           break;
 106         }
 107     }
 108   }
 109
 110   return BmMiscBoot;
 111 }
 112
 113 /**
 114   Eliminate the extra spaces in the Str to one space.
 115
 116   @param    Str     Input string info.
 117 **/
 118 VOID
 119 BmEliminateExtraSpaces (
 120   IN CHAR16                    *Str
 121   )
 122 {
 123   UINTN                        Index;
 124   UINTN                        ActualIndex;
 125
 126   for (Index = 0, ActualIndex = 0; Str[Index] != L'\0'; Index++) {
 127     if ((Str[Index] != L' ') || ((ActualIndex > 0) && (Str[ActualIndex - 1] != L' '))) {
 128       Str[ActualIndex++] = Str[Index];
 129     }
 130   }
 131   Str[ActualIndex] = L'\0';
 132 }
 133
 134 /**
 135   Try to get the controller's ATA/ATAPI description.
 136
 137   @param Handle                Controller handle.
 138
 139   @return  The description string.
 140 **/
 141 CHAR16 *
 142 BmGetDescriptionFromDiskInfo (
 143   IN EFI_HANDLE                Handle
 144   )
 145 {
 146   UINTN                        Index;
 147   EFI_STATUS                   Status;
 148   EFI_DISK_INFO_PROTOCOL       *DiskInfo;
 149   UINT32                       BufferSize;
 150   EFI_ATAPI_IDENTIFY_DATA      IdentifyData;
 151   EFI_SCSI_INQUIRY_DATA        InquiryData;
 152   CHAR16                       *Description;
 153   UINTN                        Length;
 154   CONST UINTN                  ModelNameLength    = 40;
 155   CONST UINTN                  SerialNumberLength = 20;
 156   CHAR8                        *StrPtr;
 157   UINT8                        Temp;
 158
 159   Description  = NULL;
 160
 161   Status = gBS->HandleProtocol (
 162                   Handle,
 163                   &gEfiDiskInfoProtocolGuid,
 164                   (VOID **) &DiskInfo
 165                   );
 166   if (EFI_ERROR (Status)) {
 167     return NULL;
 168   }
 169
 170   if (CompareGuid (&DiskInfo->Interface, &gEfiDiskInfoAhciInterfaceGuid) ||
 171       CompareGuid (&DiskInfo->Interface, &gEfiDiskInfoIdeInterfaceGuid)) {
 172     BufferSize   = sizeof (EFI_ATAPI_IDENTIFY_DATA);
 173     Status = DiskInfo->Identify (
 174                          DiskInfo,
 175                          &IdentifyData,
 176                          &BufferSize
 177                          );
 178     if (!EFI_ERROR (Status)) {
 179       Description = AllocateZeroPool ((ModelNameLength + SerialNumberLength + 2) * sizeof (CHAR16));
 180       ASSERT (Description != NULL);
 181       for (Index = 0; Index + 1 < ModelNameLength; Index += 2) {
 182         Description[Index]     = (CHAR16) IdentifyData.ModelName[Index + 1];
 183         Description[Index + 1] = (CHAR16) IdentifyData.ModelName[Index];
 184       }
 185
 186       Length = Index;
 187       Description[Length++] = L' ';
 188
 189       for (Index = 0; Index + 1 < SerialNumberLength; Index += 2) {
 190         Description[Length + Index]     = (CHAR16) IdentifyData.SerialNo[Index + 1];
 191         Description[Length + Index + 1] = (CHAR16) IdentifyData.SerialNo[Index];
 192       }
 193       Length += Index;
 194       Description[Length++] = L'\0';
 195       ASSERT (Length == ModelNameLength + SerialNumberLength + 2);
 196
 197       BmEliminateExtraSpaces (Description);
 198     }
 199   } else if (CompareGuid (&DiskInfo->Interface, &gEfiDiskInfoScsiInterfaceGuid)) {
 200     BufferSize   = sizeof (EFI_SCSI_INQUIRY_DATA);
 201     Status = DiskInfo->Inquiry (
 202                          DiskInfo,
 203                          &InquiryData,
 204                          &BufferSize
 205                          );
 206     if (!EFI_ERROR (Status)) {
 207       Description = AllocateZeroPool ((VENDOR_IDENTIFICATION_LENGTH + PRODUCT_IDENTIFICATION_LENGTH + 2) * sizeof (CHAR16));
 208       ASSERT (Description != NULL);
 209
 210       //
 211       // Per SCSI spec, EFI_SCSI_INQUIRY_DATA.Reserved_5_95[3 - 10] save the Verdor identification
 212       // EFI_SCSI_INQUIRY_DATA.Reserved_5_95[11 - 26] save the product identification,
 213       // Here combine the vendor identification and product identification to the description.
 214       //
 215       StrPtr = (CHAR8 *) (&InquiryData.Reserved_5_95[VENDOR_IDENTIFICATION_OFFSET]);
 216       Temp = StrPtr[VENDOR_IDENTIFICATION_LENGTH];
 217       StrPtr[VENDOR_IDENTIFICATION_LENGTH] = '\0';
 218       AsciiStrToUnicodeStrS (StrPtr, Description, VENDOR_IDENTIFICATION_LENGTH + 1);
 219       StrPtr[VENDOR_IDENTIFICATION_LENGTH] = Temp;
 220
 221       //
 222       // Add one space at the middle of vendor information and product information.
 223       //
 224       Description[VENDOR_IDENTIFICATION_LENGTH] = L' ';
 225
 226       StrPtr = (CHAR8 *) (&InquiryData.Reserved_5_95[PRODUCT_IDENTIFICATION_OFFSET]);
 227       StrPtr[PRODUCT_IDENTIFICATION_LENGTH] = '\0';
 228       AsciiStrToUnicodeStrS (StrPtr, Description + VENDOR_IDENTIFICATION_LENGTH + 1, PRODUCT_IDENTIFICATION_LENGTH + 1);
 229
 230       BmEliminateExtraSpaces (Description);
 231     }
 232   }
 233
 234   return Description;
 235 }
 236
 237 /**
 238   Try to get the controller's USB description.
 239
 240   @param Handle                Controller handle.
 241
 242   @return  The description string.
 243 **/
 244 CHAR16 *
 245 BmGetUsbDescription (
 246   IN EFI_HANDLE                Handle
 247   )
 248 {
 249   EFI_STATUS                   Status;
 250   EFI_USB_IO_PROTOCOL          *UsbIo;
 251   CHAR16                       NullChar;
 252   CHAR16                       *Manufacturer;
 253   CHAR16                       *Product;
 254   CHAR16                       *SerialNumber;
 255   CHAR16                       *Description;
 256   EFI_USB_DEVICE_DESCRIPTOR    DevDesc;
 257   UINTN                        DescMaxSize;
 258
 259   Status = gBS->HandleProtocol (
 260                   Handle,
 261                   &gEfiUsbIoProtocolGuid,
 262                   (VOID **) &UsbIo
 263                   );
 264   if (EFI_ERROR (Status)) {
 265     return NULL;
 266   }
 267
 268   NullChar = L'\0';
 269
 270   Status = UsbIo->UsbGetDeviceDescriptor (UsbIo, &DevDesc);
 271   if (EFI_ERROR (Status)) {
 272     return NULL;
 273   }
 274
 275   Status = UsbIo->UsbGetStringDescriptor (
 276                     UsbIo,
 277                     mBmUsbLangId,
 278                     DevDesc.StrManufacturer,
 279                     &Manufacturer
 280                     );
 281   if (EFI_ERROR (Status)) {
 282     Manufacturer = &NullChar;
 283   }
 284
 285   Status = UsbIo->UsbGetStringDescriptor (
 286                     UsbIo,
 287                     mBmUsbLangId,
 288                     DevDesc.StrProduct,
 289                     &Product
 290                     );
 291   if (EFI_ERROR (Status)) {
 292     Product = &NullChar;
 293   }
 294
 295   Status = UsbIo->UsbGetStringDescriptor (
 296                     UsbIo,
 297                     mBmUsbLangId,
 298                     DevDesc.StrSerialNumber,
 299                     &SerialNumber
 300                     );
 301   if (EFI_ERROR (Status)) {
 302     SerialNumber = &NullChar;
 303   }
 304
 305   if ((Manufacturer == &NullChar) &&
 306       (Product == &NullChar) &&
 307       (SerialNumber == &NullChar)
 308       ) {
 309     return NULL;
 310   }
 311
 312   DescMaxSize = StrSize (Manufacturer) + StrSize (Product) + StrSize (SerialNumber);
 313   Description = AllocateZeroPool (DescMaxSize);
 314   ASSERT (Description != NULL);
 315   StrCatS (Description, DescMaxSize/sizeof(CHAR16), Manufacturer);
 316   StrCatS (Description, DescMaxSize/sizeof(CHAR16), L" ");
 317
 318   StrCatS (Description, DescMaxSize/sizeof(CHAR16), Product);
 319   StrCatS (Description, DescMaxSize/sizeof(CHAR16), L" ");
 320
 321   StrCatS (Description, DescMaxSize/sizeof(CHAR16), SerialNumber);
 322
 323   if (Manufacturer != &NullChar) {
 324     FreePool (Manufacturer);
 325   }
 326   if (Product != &NullChar) {
 327     FreePool (Product);
 328   }
 329   if (SerialNumber != &NullChar) {
 330     FreePool (SerialNumber);
 331   }
 332
 333   BmEliminateExtraSpaces (Description);
 334
 335   return Description;
 336 }
 337
 338 /**
 339   Return the description for network boot device.
 340
 341   @param Handle                Controller handle.
 342
 343   @return  The description string.
 344 **/
 345 CHAR16 *
 346 BmGetNetworkDescription (
 347   IN EFI_HANDLE                  Handle
 348   )
 349 {
 350   EFI_STATUS                     Status;
 351   EFI_DEVICE_PATH_PROTOCOL       *DevicePath;
 352   MAC_ADDR_DEVICE_PATH           *Mac;
 353   VLAN_DEVICE_PATH               *Vlan;
 354   EFI_DEVICE_PATH_PROTOCOL       *Ip;
 355   EFI_DEVICE_PATH_PROTOCOL       *Uri;
 356   CHAR16                         *Description;
 357   UINTN                          DescriptionSize;
 358
 359   Status = gBS->OpenProtocol (
 360                   Handle,
 361                   &gEfiLoadFileProtocolGuid,
 362                   NULL,
 363                   gImageHandle,
 364                   Handle,
 365                   EFI_OPEN_PROTOCOL_TEST_PROTOCOL
 366                   );
 367   if (EFI_ERROR (Status)) {
 368     return NULL;
 369   }
 370
 371   Status = gBS->OpenProtocol (
 372                   Handle,
 373                   &gEfiDevicePathProtocolGuid,
 374                   (VOID **) &DevicePath,
 375                   gImageHandle,
 376                   Handle,
 377                   EFI_OPEN_PROTOCOL_GET_PROTOCOL
 378                   );
 379   if (EFI_ERROR (Status) || (DevicePath == NULL)) {
 380     return NULL;
 381   }
 382
 383   //
 384   // The PXE device path is like:
 385   //   ....../Mac(...)[/Vlan(...)]
 386   //   ....../Mac(...)[/Vlan(...)]/IPv4(...)
 387   //   ....../Mac(...)[/Vlan(...)]/IPv6(...)
 388   //
 389   // The HTTP device path is like:
 390   //   ....../Mac(...)[/Vlan(...)]/IPv4(...)/Uri(...)
 391   //   ....../Mac(...)[/Vlan(...)]/IPv6(...)/Uri(...)
 392   //
 393   while (!IsDevicePathEnd (DevicePath) &&
 394          ((DevicePathType (DevicePath) != MESSAGING_DEVICE_PATH) ||
 395           (DevicePathSubType (DevicePath) != MSG_MAC_ADDR_DP))
 396          ) {
 397     DevicePath = NextDevicePathNode (DevicePath);
 398   }
 399
 400   if (IsDevicePathEnd (DevicePath)) {
 401     return NULL;
 402   }
 403
 404   Mac = (MAC_ADDR_DEVICE_PATH *) DevicePath;
 405   DevicePath = NextDevicePathNode (DevicePath);
 406
 407   if ((DevicePathType (DevicePath) == MESSAGING_DEVICE_PATH) &&
 408       (DevicePathSubType (DevicePath) == MSG_VLAN_DP)
 409       ) {
 410     Vlan = (VLAN_DEVICE_PATH *) DevicePath;
 411     DevicePath = NextDevicePathNode (DevicePath);
 412   } else {
 413     Vlan = NULL;
 414   }
 415
 416   if ((DevicePathType (DevicePath) == MESSAGING_DEVICE_PATH) &&
 417       ((DevicePathSubType (DevicePath) == MSG_IPv4_DP) ||
 418        (DevicePathSubType (DevicePath) == MSG_IPv6_DP))
 419       ) {
 420     Ip = DevicePath;
 421     DevicePath = NextDevicePathNode (DevicePath);
 422   } else {
 423     Ip = NULL;
 424   }
 425
 426   if ((DevicePathType (DevicePath) == MESSAGING_DEVICE_PATH) &&
 427       (DevicePathSubType (DevicePath) == MSG_URI_DP)
 428       ) {
 429     Uri = DevicePath;
 430     DevicePath = NextDevicePathNode (DevicePath);
 431   } else {
 432     Uri = NULL;
 433   }
 434
 435   //
 436   // Build description like below:
 437   //   "PXEv6 (MAC:112233445566 VLAN1)"
 438   //   "HTTPv4 (MAC:112233445566)"
 439   //
 440   DescriptionSize = sizeof (L"HTTPv6 (MAC:112233445566 VLAN65535)");
 441   Description     = AllocatePool (DescriptionSize);
 442   ASSERT (Description != NULL);
 443   UnicodeSPrint (
 444     Description, DescriptionSize,
 445     (Vlan == NULL) ?
 446     L"%sv%d (MAC:%02x%02x%02x%02x%02x%02x)" :
 447     L"%sv%d (MAC:%02x%02x%02x%02x%02x%02x VLAN%d)",
 448     (Uri == NULL) ? L"PXE" : L"HTTP",
 449     ((Ip == NULL) || (DevicePathSubType (Ip) == MSG_IPv4_DP)) ? 4 : 6,
 450     Mac->MacAddress.Addr[0], Mac->MacAddress.Addr[1], Mac->MacAddress.Addr[2],
 451     Mac->MacAddress.Addr[3], Mac->MacAddress.Addr[4], Mac->MacAddress.Addr[5],
 452     (Vlan == NULL) ? 0 : Vlan->VlanId
 453     );
 454   return Description;
 455 }
 456
 457 /**
 458   Return the boot description for LoadFile
 459
 460   @param Handle                Controller handle.
 461
 462   @return  The description string.
 463 **/
 464 CHAR16 *
 465 BmGetLoadFileDescription (
 466   IN EFI_HANDLE                  Handle
 467   )
 468 {
 469   EFI_STATUS                            Status;
 470   EFI_DEVICE_PATH_PROTOCOL              *FilePath;
 471   EFI_DEVICE_PATH_PROTOCOL              *DevicePathNode;
 472   CHAR16                                *Description;
 473   EFI_LOAD_FILE_PROTOCOL                *LoadFile;
 474
 475   Status = gBS->HandleProtocol (Handle, &gEfiLoadFileProtocolGuid, (VOID **)&LoadFile);
 476   if (EFI_ERROR (Status)) {
 477     return NULL;
 478   }
 479
 480   //
 481   // Get the file name
 482   //
 483   Description = NULL;
 484   Status = gBS->HandleProtocol (Handle, &gEfiDevicePathProtocolGuid, (VOID **)&FilePath);
 485   if (!EFI_ERROR (Status)) {
 486     DevicePathNode = FilePath;
 487     while (!IsDevicePathEnd (DevicePathNode)) {
 488       if (DevicePathNode->Type == MEDIA_DEVICE_PATH && DevicePathNode->SubType == MEDIA_FILEPATH_DP) {
 489         Description = (CHAR16 *)(DevicePathNode + 1);
 490         break;
 491       }
 492       DevicePathNode = NextDevicePathNode (DevicePathNode);
 493     }
 494   }
 495
 496   if (Description != NULL) {
 497     return AllocateCopyPool (StrSize (Description), Description);
 498   }
 499
 500   return NULL;
 501 }
 502
 503 /**
 504   Return the boot description for the controller based on the type.
 505
 506   @param Handle                Controller handle.
 507
 508   @return  The description string.
 509 **/
 510 CHAR16 *
 511 BmGetMiscDescription (
 512   IN EFI_HANDLE                  Handle
 513   )
 514 {
 515   EFI_STATUS                      Status;
 516   CHAR16                          *Description;
 517   EFI_BLOCK_IO_PROTOCOL           *BlockIo;
 518   EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Fs;
 519
 520   switch (BmDevicePathType (DevicePathFromHandle (Handle))) {
 521   case BmAcpiFloppyBoot:
 522     Description = L"Floppy";
 523     break;
 524
 525   case BmMessageAtapiBoot:
 526   case BmMessageSataBoot:
 527     Status = gBS->HandleProtocol (Handle, &gEfiBlockIoProtocolGuid, (VOID **) &BlockIo);
 528     ASSERT_EFI_ERROR (Status);
 529     //
 530     // Assume a removable SATA device should be the DVD/CD device
 531     //
 532     Description = BlockIo->Media->RemovableMedia ? L"DVD/CDROM" : L"Hard Drive";
 533     break;
 534
 535   case BmMessageUsbBoot:
 536     Description = L"USB Device";
 537     break;
 538
 539   case BmMessageScsiBoot:
 540     Description = L"SCSI Device";
 541     break;
 542
 543   case BmHardwareDeviceBoot:
 544     Status = gBS->HandleProtocol (Handle, &gEfiBlockIoProtocolGuid, (VOID **) &BlockIo);
 545     if (!EFI_ERROR (Status)) {
 546       Description = BlockIo->Media->RemovableMedia ? L"Removable Disk" : L"Hard Drive";
 547     } else {
 548       Description = L"Misc Device";
 549     }
 550     break;
 551
 552   default:
 553     Status = gBS->HandleProtocol (Handle, &gEfiSimpleFileSystemProtocolGuid, (VOID **) &Fs);
 554     if (!EFI_ERROR (Status)) {
 555       Description = L"Non-Block Boot Device";
 556     } else {
 557       Description = L"Misc Device";
 558     }
 559     break;
 560   }
 561
 562   return AllocateCopyPool (StrSize (Description), Description);
 563 }
 564
 565 /**
 566   Register the platform provided boot description handler.
 567
 568   @param Handler  The platform provided boot description handler
 569
 570   @retval EFI_SUCCESS          The handler was registered successfully.
 571   @retval EFI_ALREADY_STARTED  The handler was already registered.
 572   @retval EFI_OUT_OF_RESOURCES There is not enough resource to perform the registration.
 573 **/
 574 EFI_STATUS
 575 EFIAPI
 576 EfiBootManagerRegisterBootDescriptionHandler (
 577   IN EFI_BOOT_MANAGER_BOOT_DESCRIPTION_HANDLER  Handler
 578   )
 579 {
 580   LIST_ENTRY                                    *Link;
 581   BM_BOOT_DESCRIPTION_ENTRY                    *Entry;
 582
 583   for ( Link = GetFirstNode (&mPlatformBootDescriptionHandlers)
 584       ; !IsNull (&mPlatformBootDescriptionHandlers, Link)
 585       ; Link = GetNextNode (&mPlatformBootDescriptionHandlers, Link)
 586       ) {
 587     Entry = CR (Link, BM_BOOT_DESCRIPTION_ENTRY, Link, BM_BOOT_DESCRIPTION_ENTRY_SIGNATURE);
 588     if (Entry->Handler == Handler) {
 589       return EFI_ALREADY_STARTED;
 590     }
 591   }
 592
 593   Entry = AllocatePool (sizeof (BM_BOOT_DESCRIPTION_ENTRY));
 594   if (Entry == NULL) {
 595     return EFI_OUT_OF_RESOURCES;
 596   }
 597
 598   Entry->Signature = BM_BOOT_DESCRIPTION_ENTRY_SIGNATURE;
 599   Entry->Handler   = Handler;
 600   InsertTailList (&mPlatformBootDescriptionHandlers, &Entry->Link);
 601   return EFI_SUCCESS;
 602 }
 603
 604 BM_GET_BOOT_DESCRIPTION mBmBootDescriptionHandlers[] = {
 605   BmGetUsbDescription,
 606   BmGetDescriptionFromDiskInfo,
 607   BmGetNetworkDescription,
 608   BmGetLoadFileDescription,
 609   BmGetMiscDescription
 610 };
 611
 612 /**
 613   Return the boot description for the controller.
 614
 615   @param Handle                Controller handle.
 616
 617   @return  The description string.
 618 **/
 619 CHAR16 *
 620 BmGetBootDescription (
 621   IN EFI_HANDLE                  Handle
 622   )
 623 {
 624   LIST_ENTRY                     *Link;
 625   BM_BOOT_DESCRIPTION_ENTRY      *Entry;
 626   CHAR16                         *Description;
 627   CHAR16                         *DefaultDescription;
 628   CHAR16                         *Temp;
 629   UINTN                          Index;
 630
 631   //
 632   // Firstly get the default boot description
 633   //
 634   DefaultDescription = NULL;
 635   for (Index = 0; Index < ARRAY_SIZE (mBmBootDescriptionHandlers); Index++) {
 636     DefaultDescription = mBmBootDescriptionHandlers[Index] (Handle);
 637     if (DefaultDescription != NULL) {
 638       //
 639       // Avoid description confusion between UEFI & Legacy boot option by adding "UEFI " prefix
 640       // ONLY for core provided boot description handler.
 641       //
 642       Temp = AllocatePool (StrSize (DefaultDescription) + sizeof (mBmUefiPrefix));
 643       ASSERT (Temp != NULL);
 644       StrCpyS (Temp, (StrSize (DefaultDescription) + sizeof (mBmUefiPrefix)) / sizeof (CHAR16), mBmUefiPrefix);
 645       StrCatS (Temp, (StrSize (DefaultDescription) + sizeof (mBmUefiPrefix)) / sizeof (CHAR16), DefaultDescription);
 646       FreePool (DefaultDescription);
 647       DefaultDescription = Temp;
 648       break;
 649     }
 650   }
 651   ASSERT (DefaultDescription != NULL);
 652
 653   //
 654   // Secondly query platform for the better boot description
 655   //
 656   for ( Link = GetFirstNode (&mPlatformBootDescriptionHandlers)
 657       ; !IsNull (&mPlatformBootDescriptionHandlers, Link)
 658       ; Link = GetNextNode (&mPlatformBootDescriptionHandlers, Link)
 659       ) {
 660     Entry = CR (Link, BM_BOOT_DESCRIPTION_ENTRY, Link, BM_BOOT_DESCRIPTION_ENTRY_SIGNATURE);
 661     Description = Entry->Handler (Handle, DefaultDescription);
 662     if (Description != NULL) {
 663       FreePool (DefaultDescription);
 664       return Description;
 665     }
 666   }
 667
 668   return DefaultDescription;
 669 }
 670
 671 /**
 672   Enumerate all boot option descriptions and append " 2"/" 3"/... to make
 673   unique description.
 674
 675   @param BootOptions            Array of boot options.
 676   @param BootOptionCount        Count of boot options.
 677 **/
 678 VOID
 679 BmMakeBootOptionDescriptionUnique (
 680   EFI_BOOT_MANAGER_LOAD_OPTION         *BootOptions,
 681   UINTN                                BootOptionCount
 682   )
 683 {
 684   UINTN                                Base;
 685   UINTN                                Index;
 686   UINTN                                DescriptionSize;
 687   UINTN                                MaxSuffixSize;
 688   BOOLEAN                              *Visited;
 689   UINTN                                MatchCount;
 690
 691   if (BootOptionCount == 0) {
 692     return;
 693   }
 694
 695   //
 696   // Calculate the maximum buffer size for the number suffix.
 697   // The initial sizeof (CHAR16) is for the blank space before the number.
 698   //
 699   MaxSuffixSize = sizeof (CHAR16);
 700   for (Index = BootOptionCount; Index != 0; Index = Index / 10) {
 701     MaxSuffixSize += sizeof (CHAR16);
 702   }
 703
 704   Visited = AllocateZeroPool (sizeof (BOOLEAN) * BootOptionCount);
 705   ASSERT (Visited != NULL);
 706
 707   for (Base = 0; Base < BootOptionCount; Base++) {
 708     if (!Visited[Base]) {
 709       MatchCount      = 1;
 710       Visited[Base]   = TRUE;
 711       DescriptionSize = StrSize (BootOptions[Base].Description);
 712       for (Index = Base + 1; Index < BootOptionCount; Index++) {
 713         if (!Visited[Index] && StrCmp (BootOptions[Base].Description, BootOptions[Index].Description) == 0) {
 714           Visited[Index] = TRUE;
 715           MatchCount++;
 716           FreePool (BootOptions[Index].Description);
 717           BootOptions[Index].Description = AllocatePool (DescriptionSize + MaxSuffixSize);
 718           UnicodeSPrint (
 719             BootOptions[Index].Description, DescriptionSize + MaxSuffixSize,
 720             L"%s %d",
 721             BootOptions[Base].Description, MatchCount
 722             );
 723         }
 724       }
 725     }
 726   }
 727
 728   FreePool (Visited);
 729 }