DuetPkg/FSVariable/FSVariable.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   FSVariable.c
  15
  16 Abstract:
  17
  18   Provide support functions for variable services.
  19
  20 --*/
  21
  22 #include "FSVariable.h"
  23
  24 VARIABLE_STORE_HEADER mStoreHeaderTemplate = {
  25   VARIABLE_STORE_SIGNATURE,
  26   VOLATILE_VARIABLE_STORE_SIZE,
  27   VARIABLE_STORE_FORMATTED,
  28   VARIABLE_STORE_HEALTHY,
  29   0,
  30   0
  31 };
  32
  33 //
  34 // Don't use module globals after the SetVirtualAddress map is signaled
  35 //
  36 VARIABLE_GLOBAL  *mGlobal;
  37
  38 STATIC
  39 VOID
  40 EFIAPI
  41 OnVirtualAddressChange (
  42   IN EFI_EVENT        Event,
  43   IN VOID             *Context
  44   );
  45
  46 STATIC
  47 VOID
  48 EFIAPI
  49 OnSimpleFileSystemInstall (
  50   IN EFI_EVENT        Event,
  51   IN VOID             *Context
  52   );
  53
  54 STATIC
  55 BOOLEAN
  56 IsValidVariableHeader (
  57   IN  VARIABLE_HEADER   *Variable
  58   )
  59 /*++
  60
  61 Routine Description:
  62
  63   This code checks if variable header is valid or not.
  64
  65 Arguments:
  66   Variable        Pointer to the Variable Header.
  67
  68 Returns:
  69   TRUE            Variable header is valid.
  70   FALSE           Variable header is not valid.
  71
  72 --*/
  73 {
  74   if (Variable == NULL ||
  75       Variable->StartId != VARIABLE_DATA ||
  76       (sizeof (VARIABLE_HEADER) + Variable->NameSize + Variable->DataSize) > MAX_VARIABLE_SIZE
  77       ) {
  78     return FALSE;
  79   }
  80
  81   return TRUE;
  82 }
  83
  84 STATIC
  85 VARIABLE_STORE_STATUS
  86 GetVariableStoreStatus (
  87   IN VARIABLE_STORE_HEADER *VarStoreHeader
  88   )
  89 /*++
  90
  91 Routine Description:
  92
  93   This code gets the current status of Variable Store.
  94
  95 Arguments:
  96
  97   VarStoreHeader  Pointer to the Variable Store Header.
  98
  99 Returns:
 100
 101   EfiRaw        Variable store status is raw
 102   EfiValid      Variable store status is valid
 103   EfiInvalid    Variable store status is invalid
 104
 105 --*/
 106 {
 107   if ((VarStoreHeader->Signature == mStoreHeaderTemplate.Signature) &&
 108       (VarStoreHeader->Format == mStoreHeaderTemplate.Format) &&
 109       (VarStoreHeader->State == mStoreHeaderTemplate.State)
 110      ) {
 111     return EfiValid;
 112   } else if (VarStoreHeader->Signature == VAR_DEFAULT_VALUE_32 &&
 113            VarStoreHeader->Size == VAR_DEFAULT_VALUE_32 &&
 114            VarStoreHeader->Format == VAR_DEFAULT_VALUE &&
 115            VarStoreHeader->State == VAR_DEFAULT_VALUE
 116           ) {
 117
 118     return EfiRaw;
 119   } else {
 120     return EfiInvalid;
 121   }
 122 }
 123
 124 STATIC
 125 UINT8 *
 126 GetVariableDataPtr (
 127   IN  VARIABLE_HEADER   *Variable
 128   )
 129 /*++
 130
 131 Routine Description:
 132
 133   This code gets the pointer to the variable data.
 134
 135 Arguments:
 136
 137   Variable            Pointer to the Variable Header.
 138
 139 Returns:
 140
 141   UINT8*              Pointer to Variable Data
 142
 143 --*/
 144 {
 145   //
 146   // Be careful about pad size for alignment
 147   //
 148   return (UINT8 *) ((UINTN) GET_VARIABLE_NAME_PTR (Variable) + Variable->NameSize + GET_PAD_SIZE (Variable->NameSize));
 149 }
 150
 151 STATIC
 152 VARIABLE_HEADER *
 153 GetNextVariablePtr (
 154   IN  VARIABLE_HEADER   *Variable
 155   )
 156 /*++
 157
 158 Routine Description:
 159
 160   This code gets the pointer to the next variable header.
 161
 162 Arguments:
 163
 164   Variable              Pointer to the Variable Header.
 165
 166 Returns:
 167
 168   VARIABLE_HEADER*      Pointer to next variable header.
 169
 170 --*/
 171 {
 172   if (!IsValidVariableHeader (Variable)) {
 173     return NULL;
 174   }
 175   //
 176   // Be careful about pad size for alignment
 177   //
 178   return (VARIABLE_HEADER *) ((UINTN) GetVariableDataPtr (Variable) + Variable->DataSize + GET_PAD_SIZE (Variable->DataSize));
 179 }
 180
 181 STATIC
 182 VARIABLE_HEADER *
 183 GetEndPointer (
 184   IN VARIABLE_STORE_HEADER       *VarStoreHeader
 185   )
 186 /*++
 187
 188 Routine Description:
 189
 190   This code gets the pointer to the last variable memory pointer byte
 191
 192 Arguments:
 193
 194   VarStoreHeader        Pointer to the Variable Store Header.
 195
 196 Returns:
 197
 198   VARIABLE_HEADER*      Pointer to last unavailable Variable Header
 199
 200 --*/
 201 {
 202   //
 203   // The end of variable store
 204   //
 205   return (VARIABLE_HEADER *) ((UINTN) VarStoreHeader + VarStoreHeader->Size);
 206 }
 207
 208 BOOLEAN
 209 ExistNewerVariable (
 210   IN  VARIABLE_HEADER         *Variable
 211   )
 212 /*++
 213
 214 Routine Description:
 215
 216   Check if exist newer variable when doing reclaim
 217
 218 Arguments:
 219
 220   Variable                    Pointer to start position
 221
 222 Returns:
 223
 224   TRUE - Exists another variable, which is newer than the current one
 225   FALSE  - Doesn't exist another vairable which is newer than the current one
 226
 227 --*/
 228 {
 229   VARIABLE_HEADER       *NextVariable;
 230   CHAR16                *VariableName;
 231   EFI_GUID              *VendorGuid;
 232
 233   VendorGuid   = &Variable->VendorGuid;
 234   VariableName = GET_VARIABLE_NAME_PTR(Variable);
 235
 236   NextVariable = GetNextVariablePtr (Variable);
 237   while (IsValidVariableHeader (NextVariable)) {
 238     if ((NextVariable->State == VAR_ADDED) || (NextVariable->State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION))) {
 239       //
 240       // If match Guid and Name
 241       //
 242       if (CompareGuid (VendorGuid, &NextVariable->VendorGuid)) {
 243          if (CompareMem (VariableName, GET_VARIABLE_NAME_PTR (NextVariable), StrSize (VariableName)) == 0) {
 244            return TRUE;
 245          }
 246        }
 247     }
 248     NextVariable = GetNextVariablePtr (NextVariable);
 249   }
 250   return FALSE;
 251 }
 252
 253 STATIC
 254 EFI_STATUS
 255 Reclaim (
 256   IN  VARIABLE_STORAGE_TYPE StorageType,
 257   IN  VARIABLE_HEADER       *CurrentVariable OPTIONAL
 258   )
 259 /*++
 260
 261 Routine Description:
 262
 263   Variable store garbage collection and reclaim operation
 264
 265 Arguments:
 266
 267   IsVolatile                  The variable store is volatile or not,
 268                               if it is non-volatile, need FTW
 269   CurrentVairable             If it is not NULL, it means not to process
 270                               current variable for Reclaim.
 271
 272 Returns:
 273
 274   EFI STATUS
 275
 276 --*/
 277 {
 278   VARIABLE_HEADER       *Variable;
 279   VARIABLE_HEADER       *NextVariable;
 280   VARIABLE_STORE_HEADER *VariableStoreHeader;
 281   UINT8                 *ValidBuffer;
 282   UINTN                 ValidBufferSize;
 283   UINTN                 VariableSize;
 284   UINT8                 *CurrPtr;
 285   EFI_STATUS            Status;
 286
 287   VariableStoreHeader = (VARIABLE_STORE_HEADER *) mGlobal->VariableBase[StorageType];
 288
 289   //
 290   // Start Pointers for the variable.
 291   //
 292   Variable        = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
 293
 294
 295   //
 296   // To make the reclaim, here we just allocate a memory that equal to the original memory
 297   //
 298   ValidBufferSize = sizeof (VARIABLE_STORE_HEADER) + VariableStoreHeader->Size;
 299
 300   Status = gBS->AllocatePool (
 301                   EfiBootServicesData,
 302                   ValidBufferSize,
 303                   &ValidBuffer
 304                   );
 305   if (EFI_ERROR (Status)) {
 306     return Status;
 307   }
 308
 309   CurrPtr = ValidBuffer;
 310
 311   //
 312   // Copy variable store header
 313   //
 314   CopyMem (CurrPtr, VariableStoreHeader, sizeof (VARIABLE_STORE_HEADER));
 315   CurrPtr += sizeof (VARIABLE_STORE_HEADER);
 316
 317   //
 318   // Start Pointers for the variable.
 319   //
 320   Variable = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
 321
 322
 323   ValidBufferSize = sizeof (VARIABLE_STORE_HEADER);
 324   while (IsValidVariableHeader (Variable)) {
 325     NextVariable = GetNextVariablePtr (Variable);
 326     //
 327     // State VAR_ADDED or VAR_IN_DELETED_TRANSITION are to kept,
 328     // The CurrentVariable, is also saved, as SetVariable may fail due to lack of space
 329     //
 330     if (Variable->State == VAR_ADDED) {
 331       VariableSize = (UINTN) NextVariable - (UINTN) Variable;
 332       CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
 333       ValidBufferSize += VariableSize;
 334       CurrPtr += VariableSize;
 335     } else if (Variable->State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION)) {
 336       //
 337       // As variables that with the same guid and name may exist in NV due to power failure during SetVariable,
 338       // we will only save the latest valid one
 339       //
 340       if (!ExistNewerVariable(Variable)) {
 341         VariableSize = (UINTN) NextVariable - (UINTN) Variable;
 342         CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
 343         //
 344         // If CurrentVariable == Variable, mark as VAR_IN_DELETED_TRANSITION
 345         //
 346         if (Variable != CurrentVariable){
 347           ((VARIABLE_HEADER *)CurrPtr)->State = VAR_ADDED;
 348         }
 349         CurrPtr += VariableSize;
 350         ValidBufferSize += VariableSize;
 351       }
 352     }
 353     Variable = NextVariable;
 354   }
 355
 356   //
 357   // TODO: cannot restore to original state, basic FTW needed
 358   //
 359   Status = mGlobal->VariableStore[StorageType]->Erase (
 360                                                   mGlobal->VariableStore[StorageType]
 361                                                   );
 362   Status = mGlobal->VariableStore[StorageType]->Write (
 363                                                     mGlobal->VariableStore[StorageType],
 364                                                     0,
 365                                                     ValidBufferSize,
 366                                                     ValidBuffer
 367                                                     );
 368
 369   // ASSERT_EFI_ERROR (Status);
 370
 371   mGlobal->LastVariableOffset[StorageType] = ValidBufferSize;
 372   gBS->FreePool (ValidBuffer);
 373
 374   return Status;
 375 }
 376
 377 STATIC
 378 EFI_STATUS
 379 FindVariable (
 380   IN  CHAR16                  *VariableName,
 381   IN  EFI_GUID                *VendorGuid,
 382   OUT VARIABLE_POINTER_TRACK  *PtrTrack
 383   )
 384 /*++
 385
 386 Routine Description:
 387
 388   This code finds variable in storage blocks (Volatile or Non-Volatile)
 389
 390 Arguments:
 391
 392   VariableName                Name of the variable to be found
 393   VendorGuid                  Vendor GUID to be found.
 394   PtrTrack                    Variable Track Pointer structure that contains
 395                               Variable Information.
 396                               Contains the pointer of Variable header.
 397
 398 Returns:
 399
 400   EFI_INVALID_PARAMETER       - Invalid parameter
 401   EFI_SUCCESS                 - Find the specified variable
 402   EFI_NOT_FOUND               - Not found
 403
 404 --*/
 405 {
 406   VARIABLE_HEADER         *Variable;
 407   VARIABLE_STORE_HEADER   *VariableStoreHeader;
 408   UINTN                   Index;
 409   VARIABLE_HEADER         *InDeleteVariable;
 410   UINTN                   InDeleteIndex;
 411   VARIABLE_HEADER         *InDeleteStartPtr;
 412   VARIABLE_HEADER         *InDeleteEndPtr;
 413
 414   if (VariableName[0] != 0 && VendorGuid == NULL) {
 415     return EFI_INVALID_PARAMETER;
 416   }
 417
 418   InDeleteVariable = NULL;
 419   InDeleteIndex    = (UINTN)-1;
 420   InDeleteStartPtr = NULL;
 421   InDeleteEndPtr   = NULL;
 422
 423   for (Index = 0; Index < MaxType; Index ++) {
 424     //
 425     // 0: Non-Volatile, 1: Volatile
 426     //
 427     VariableStoreHeader = (VARIABLE_STORE_HEADER *) mGlobal->VariableBase[Index];
 428
 429     //
 430     // Start Pointers for the variable.
 431     // Actual Data Pointer where data can be written.
 432     //
 433     Variable = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
 434
 435     //
 436     // Find the variable by walk through non-volatile and volatile variable store
 437     //
 438     PtrTrack->StartPtr = Variable;
 439     PtrTrack->EndPtr   = GetEndPointer (VariableStoreHeader);
 440
 441     while (IsValidVariableHeader (Variable) && (Variable < PtrTrack->EndPtr)) {
 442       if (Variable->State == VAR_ADDED) {
 443         if (!EfiAtRuntime () || (Variable->Attributes & EFI_VARIABLE_RUNTIME_ACCESS)) {
 444           if (VariableName[0] == 0) {
 445             PtrTrack->CurrPtr = Variable;
 446             PtrTrack->Type    = (VARIABLE_STORAGE_TYPE) Index;
 447             return EFI_SUCCESS;
 448           } else {
 449             if (CompareGuid (VendorGuid, &Variable->VendorGuid)) {
 450               if (!CompareMem (VariableName, GET_VARIABLE_NAME_PTR (Variable), StrSize (VariableName))) {
 451                 PtrTrack->CurrPtr = Variable;
 452                 PtrTrack->Type    = (VARIABLE_STORAGE_TYPE) Index;
 453                 return EFI_SUCCESS;
 454               }
 455             }
 456           }
 457         }
 458       } else if (Variable->State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION)) {
 459         //
 460         // VAR_IN_DELETED_TRANSITION should also be checked.
 461         //
 462         if (!EfiAtRuntime () || (Variable->Attributes & EFI_VARIABLE_RUNTIME_ACCESS)) {
 463           if (VariableName[0] == 0) {
 464             InDeleteVariable = Variable;
 465             InDeleteIndex    = Index;
 466             InDeleteStartPtr = PtrTrack->StartPtr;
 467             InDeleteEndPtr   = PtrTrack->EndPtr;
 468           } else {
 469             if (CompareGuid (VendorGuid, &Variable->VendorGuid)) {
 470               if (!CompareMem (VariableName, GET_VARIABLE_NAME_PTR (Variable), StrSize (VariableName))) {
 471                 InDeleteVariable = Variable;
 472                 InDeleteIndex    = Index;
 473                 InDeleteStartPtr = PtrTrack->StartPtr;
 474                 InDeleteEndPtr   = PtrTrack->EndPtr;
 475               }
 476             }
 477           }
 478         }
 479       }
 480
 481       Variable = GetNextVariablePtr (Variable);
 482     }
 483     //
 484     // While (...)
 485     //
 486   }
 487   //
 488   // for (...)
 489   //
 490
 491   //
 492   // if VAR_IN_DELETED_TRANSITION found, and VAR_ADDED not found,
 493   // we return it.
 494   //
 495   if (InDeleteVariable != NULL) {
 496     PtrTrack->CurrPtr  = InDeleteVariable;
 497     PtrTrack->Type     = (VARIABLE_STORAGE_TYPE) InDeleteIndex;
 498     PtrTrack->StartPtr = InDeleteStartPtr;
 499     PtrTrack->EndPtr   = InDeleteEndPtr;
 500     return EFI_SUCCESS;
 501   }
 502
 503   PtrTrack->CurrPtr = NULL;
 504   return EFI_NOT_FOUND;
 505 }
 506
 507 EFI_STATUS
 508 EFIAPI
 509 GetVariable (
 510   IN      CHAR16            *VariableName,
 511   IN      EFI_GUID          *VendorGuid,
 512   OUT     UINT32            *Attributes OPTIONAL,
 513   IN OUT  UINTN             *DataSize,
 514   OUT     VOID              *Data
 515   )
 516 /*++
 517
 518 Routine Description:
 519
 520   This code finds variable in storage blocks (Volatile or Non-Volatile)
 521
 522 Arguments:
 523
 524   VariableName                    Name of Variable to be found
 525   VendorGuid                      Variable vendor GUID
 526   Attributes OPTIONAL             Attribute value of the variable found
 527   DataSize                        Size of Data found. If size is less than the
 528                                   data, this value contains the required size.
 529   Data                            Data pointer
 530
 531 Returns:
 532
 533   EFI STATUS
 534
 535 --*/
 536 {
 537   VARIABLE_POINTER_TRACK  Variable;
 538   UINTN                   VarDataSize;
 539   EFI_STATUS              Status;
 540
 541   if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {
 542     return EFI_INVALID_PARAMETER;
 543   }
 544
 545   //
 546   // Find existing variable
 547   //
 548   Status = FindVariable (VariableName, VendorGuid, &Variable);
 549
 550   if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
 551     return Status;
 552   }
 553   //
 554   // Get data size
 555   //
 556   VarDataSize = Variable.CurrPtr->DataSize;
 557   if (*DataSize >= VarDataSize) {
 558     if (Data == NULL) {
 559       return EFI_INVALID_PARAMETER;
 560     }
 561     CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr), VarDataSize);
 562
 563     if (Attributes != NULL) {
 564       *Attributes = Variable.CurrPtr->Attributes;
 565     }
 566
 567     *DataSize = VarDataSize;
 568
 569     return EFI_SUCCESS;
 570   } else {
 571     *DataSize = VarDataSize;
 572     return EFI_BUFFER_TOO_SMALL;
 573   }
 574 }
 575
 576 EFI_STATUS
 577 EFIAPI
 578 GetNextVariableName (
 579   IN OUT  UINTN             *VariableNameSize,
 580   IN OUT  CHAR16            *VariableName,
 581   IN OUT  EFI_GUID          *VendorGuid
 582   )
 583 /*++
 584
 585 Routine Description:
 586
 587   This code Finds the Next available variable
 588
 589 Arguments:
 590
 591   VariableNameSize            Size of the variable
 592   VariableName                Pointer to variable name
 593   VendorGuid                  Variable Vendor Guid
 594
 595 Returns:
 596
 597   EFI STATUS
 598
 599 --*/
 600 {
 601   VARIABLE_POINTER_TRACK  Variable;
 602   UINTN                   VarNameSize;
 603   EFI_STATUS              Status;
 604
 605   if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {
 606     return EFI_INVALID_PARAMETER;
 607   }
 608
 609   Status = FindVariable (VariableName, VendorGuid, &Variable);
 610
 611   if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
 612     return Status;
 613   }
 614
 615   if (VariableName[0] != 0) {
 616     //
 617     // If variable name is not NULL, get next variable
 618     //
 619     Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
 620   }
 621
 622   while (TRUE) {
 623     //
 624     // The order we find variable is: 1). NonVolatile; 2). Volatile
 625     // If both volatile and non-volatile variable store are parsed,
 626     // return not found
 627     //
 628     if (Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == NULL) {
 629       if (Variable.Type == Volatile) {
 630         //
 631         // Since we met the end of Volatile storage, we have parsed all the stores.
 632         //
 633         return EFI_NOT_FOUND;
 634       }
 635
 636       //
 637       // End of NonVolatile, continue to parse Volatile
 638       //
 639       Variable.Type = Volatile;
 640       Variable.StartPtr = (VARIABLE_HEADER *) ((VARIABLE_STORE_HEADER *) mGlobal->VariableBase[Volatile] + 1);
 641       Variable.EndPtr   = (VARIABLE_HEADER *) GetEndPointer ((VARIABLE_STORE_HEADER *) mGlobal->VariableBase[Volatile]);
 642
 643       Variable.CurrPtr = Variable.StartPtr;
 644       if (!IsValidVariableHeader (Variable.CurrPtr)) {
 645         continue;
 646       }
 647     }
 648     //
 649     // Variable is found
 650     //
 651     if (IsValidVariableHeader (Variable.CurrPtr) &&
 652         ((Variable.CurrPtr->State == VAR_ADDED) ||
 653          (Variable.CurrPtr->State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION)))) {
 654       if (!EfiAtRuntime () || (Variable.CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS)) {
 655         VarNameSize = Variable.CurrPtr->NameSize;
 656         if (VarNameSize <= *VariableNameSize) {
 657           CopyMem (
 658             VariableName,
 659             GET_VARIABLE_NAME_PTR (Variable.CurrPtr),
 660             VarNameSize
 661             );
 662           CopyMem (
 663             VendorGuid,
 664             &Variable.CurrPtr->VendorGuid,
 665             sizeof (EFI_GUID)
 666             );
 667           Status = EFI_SUCCESS;
 668         } else {
 669           Status = EFI_BUFFER_TOO_SMALL;
 670         }
 671
 672         *VariableNameSize = VarNameSize;
 673         return Status;
 674       }
 675     }
 676
 677     Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
 678   }
 679
 680   return EFI_NOT_FOUND;
 681 }
 682
 683 EFI_STATUS
 684 EFIAPI
 685 SetVariable (
 686   IN CHAR16                  *VariableName,
 687   IN EFI_GUID                *VendorGuid,
 688   IN UINT32                  Attributes,
 689   IN UINTN                   DataSize,
 690   IN VOID                    *Data
 691   )
 692 /*++
 693
 694 Routine Description:
 695
 696   This code sets variable in storage blocks (Volatile or Non-Volatile)
 697
 698 Arguments:
 699
 700   VariableName                    Name of Variable to be found
 701   VendorGuid                      Variable vendor GUID
 702   Attributes                      Attribute value of the variable found
 703   DataSize                        Size of Data found. If size is less than the
 704                                   data, this value contains the required size.
 705   Data                            Data pointer
 706
 707 Returns:
 708
 709   EFI_INVALID_PARAMETER           - Invalid parameter
 710   EFI_SUCCESS                     - Set successfully
 711   EFI_OUT_OF_RESOURCES            - Resource not enough to set variable
 712   EFI_NOT_FOUND                   - Not found
 713   EFI_DEVICE_ERROR                - Variable can not be saved due to hardware failure
 714   EFI_WRITE_PROTECTED             - Variable is read-only
 715
 716 --*/
 717 {
 718   VARIABLE_POINTER_TRACK  Variable;
 719   EFI_STATUS              Status;
 720   VARIABLE_HEADER         *NextVariable;
 721   UINTN                   VarNameSize;
 722   UINTN                   VarNameOffset;
 723   UINTN                   VarDataOffset;
 724   UINTN                   VarSize;
 725   UINT8                   State;
 726   BOOLEAN                 Reclaimed;
 727   VARIABLE_STORAGE_TYPE   StorageType;
 728
 729   Reclaimed = FALSE;
 730
 731   //
 732   // Check input parameters
 733   //
 734
 735   if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {
 736     return EFI_INVALID_PARAMETER;
 737   }
 738
 739   //
 740   //  Make sure if runtime bit is set, boot service bit is set also
 741   //
 742   if ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == EFI_VARIABLE_RUNTIME_ACCESS) {
 743     return EFI_INVALID_PARAMETER;
 744   }
 745
 746   //
 747   //  The size of the VariableName, including the Unicode Null in bytes plus
 748   //  the DataSize is limited to maximum size of MAX_HARDWARE_ERROR_VARIABLE_SIZE (32K)
 749   //  bytes for HwErrRec, and MAX_VARIABLE_SIZE (1024) bytes for the others.
 750   //
 751   if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
 752     if ((DataSize > MAX_HARDWARE_ERROR_VARIABLE_SIZE) ||
 753         (sizeof (VARIABLE_HEADER) + StrSize (VariableName) + DataSize > MAX_HARDWARE_ERROR_VARIABLE_SIZE)) {
 754       return EFI_INVALID_PARAMETER;
 755     }
 756   } else {
 757     if ((DataSize > MAX_VARIABLE_SIZE) ||
 758         (sizeof (VARIABLE_HEADER) + StrSize (VariableName) + DataSize > MAX_VARIABLE_SIZE)) {
 759       return EFI_INVALID_PARAMETER;
 760     }
 761   }
 762
 763   //
 764   // Check whether the input variable is already existed
 765   //
 766
 767   Status = FindVariable (VariableName, VendorGuid, &Variable);
 768
 769   if (Status == EFI_SUCCESS && Variable.CurrPtr != NULL) {
 770     //
 771     // Update/Delete existing variable
 772     //
 773
 774     if (EfiAtRuntime ()) {
 775       //
 776       // If EfiAtRuntime and the variable is Volatile and Runtime Access,
 777       // the volatile is ReadOnly, and SetVariable should be aborted and
 778       // return EFI_WRITE_PROTECTED.
 779       //
 780       if (Variable.Type == Volatile) {
 781         return EFI_WRITE_PROTECTED;
 782       }
 783       //
 784       // Only variable have NV attribute can be updated/deleted in Runtime
 785       //
 786       if (!(Variable.CurrPtr->Attributes & EFI_VARIABLE_NON_VOLATILE)) {
 787         return EFI_INVALID_PARAMETER;
 788       }
 789     }
 790
 791     //
 792     // Setting a data variable with no access, or zero DataSize attributes
 793     // specified causes it to be deleted.
 794     //
 795     if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
 796       //
 797       // Found this variable in storage
 798       //
 799       State = Variable.CurrPtr->State;
 800       State &= VAR_DELETED;
 801
 802       Status = mGlobal->VariableStore[Variable.Type]->Write (
 803                                                         mGlobal->VariableStore[Variable.Type],
 804                                                         VARIABLE_MEMBER_OFFSET (State, (UINTN) Variable.CurrPtr - (UINTN) Variable.StartPtr),
 805                                                         sizeof (Variable.CurrPtr->State),
 806                                                         &State
 807                                                         );
 808       //
 809       // NOTE: Write operation at least can write data to memory cache
 810       //       Discard file writing failure here.
 811       //
 812       return EFI_SUCCESS;
 813     }
 814
 815     //
 816     // Found this variable in storage
 817     // If the variable is marked valid and the same data has been passed in
 818     // then return to the caller immediately.
 819     //
 820     if ((Variable.CurrPtr->DataSize == DataSize) &&
 821         (CompareMem (Data, GetVariableDataPtr (Variable.CurrPtr), DataSize) == 0)
 822           ) {
 823       return EFI_SUCCESS;
 824     } else if ((Variable.CurrPtr->State == VAR_ADDED) ||
 825                (Variable.CurrPtr->State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION))) {
 826       //
 827       // Mark the old variable as in delete transition
 828       //
 829       State = Variable.CurrPtr->State;
 830       State &= VAR_IN_DELETED_TRANSITION;
 831
 832       Status = mGlobal->VariableStore[Variable.Type]->Write (
 833                                                         mGlobal->VariableStore[Variable.Type],
 834                                                         VARIABLE_MEMBER_OFFSET (State, (UINTN) Variable.CurrPtr - (UINTN) Variable.StartPtr),
 835                                                         sizeof (Variable.CurrPtr->State),
 836                                                         &State
 837                                                         );
 838       //
 839       // NOTE: Write operation at least can write data to memory cache
 840       //       Discard file writing failure here.
 841       //
 842     }
 843   } else if (Status == EFI_NOT_FOUND) {
 844     //
 845     // Create a new variable
 846     //
 847
 848     //
 849     // Make sure we are trying to create a new variable.
 850     // Setting a data variable with no access, or zero DataSize attributes means to delete it.
 851     //
 852     if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
 853       return EFI_NOT_FOUND;
 854     }
 855     //
 856     // Only variable have NV|RT attribute can be created in Runtime
 857     //
 858     if (EfiAtRuntime () &&
 859         (!(Attributes & EFI_VARIABLE_RUNTIME_ACCESS) || !(Attributes & EFI_VARIABLE_NON_VOLATILE))) {
 860       return EFI_INVALID_PARAMETER;
 861     }
 862
 863   } else {
 864     //
 865     // Status should be EFI_INVALID_PARAMETER here according to return status of FindVariable().
 866     //
 867     return Status;
 868   }
 869
 870   //
 871   // Function part - create a new variable and copy the data.
 872   // Both update a variable and create a variable will come here.
 873   // We can firstly write all the data in memory, then write them to file
 874   // This can reduce the times of write operation
 875   //
 876
 877   NextVariable = (VARIABLE_HEADER *) mGlobal->Scratch;
 878
 879   NextVariable->StartId     = VARIABLE_DATA;
 880   NextVariable->Attributes  = Attributes;
 881   NextVariable->State       = VAR_ADDED;
 882   NextVariable->Reserved    = 0;
 883   VarNameOffset             = sizeof (VARIABLE_HEADER);
 884   VarNameSize               = StrSize (VariableName);
 885   CopyMem (
 886     (UINT8 *) ((UINTN) NextVariable + VarNameOffset),
 887     VariableName,
 888     VarNameSize
 889     );
 890   VarDataOffset = VarNameOffset + VarNameSize + GET_PAD_SIZE (VarNameSize);
 891   CopyMem (
 892     (UINT8 *) ((UINTN) NextVariable + VarDataOffset),
 893     Data,
 894     DataSize
 895     );
 896   CopyMem (&NextVariable->VendorGuid, VendorGuid, sizeof (EFI_GUID));
 897   //
 898   // There will be pad bytes after Data, the NextVariable->NameSize and
 899   // NextVariable->DataSize should not include pad size so that variable
 900   // service can get actual size in GetVariable
 901   //
 902   NextVariable->NameSize  = (UINT32)VarNameSize;
 903   NextVariable->DataSize  = (UINT32)DataSize;
 904
 905   //
 906   // The actual size of the variable that stores in storage should
 907   // include pad size.
 908   // VarDataOffset: offset from begin of current variable header
 909   //
 910   VarSize = VarDataOffset + DataSize + GET_PAD_SIZE (DataSize);
 911
 912   StorageType = (Attributes & EFI_VARIABLE_NON_VOLATILE) ? NonVolatile : Volatile;
 913
 914   if ((UINT32) (VarSize + mGlobal->LastVariableOffset[StorageType]) >
 915       ((VARIABLE_STORE_HEADER *) mGlobal->VariableBase[StorageType])->Size
 916       ) {
 917     if ((StorageType == NonVolatile) && EfiAtRuntime ()) {
 918       return EFI_OUT_OF_RESOURCES;
 919     }
 920     //
 921     // Perform garbage collection & reclaim operation
 922     //
 923     Status = Reclaim (StorageType, Variable.CurrPtr);
 924     if (EFI_ERROR (Status)) {
 925       //
 926       // Reclaim error
 927       // we cannot restore to original state, fetal error, report to user
 928       //
 929       DEBUG ((EFI_D_ERROR, "FSVariable: Recalim error (fetal error) - %r\n", Status));
 930       return Status;
 931     }
 932     //
 933     // If still no enough space, return out of resources
 934     //
 935     if ((UINT32) (VarSize + mGlobal->LastVariableOffset[StorageType]) >
 936         ((VARIABLE_STORE_HEADER *) mGlobal->VariableBase[StorageType])->Size
 937        ) {
 938       return EFI_OUT_OF_RESOURCES;
 939     }
 940
 941     Reclaimed = TRUE;
 942   }
 943   Status = mGlobal->VariableStore[StorageType]->Write (
 944                                                   mGlobal->VariableStore[StorageType],
 945                                                   mGlobal->LastVariableOffset[StorageType],
 946                                                   VarSize,
 947                                                   NextVariable
 948                                                   );
 949   //
 950   // NOTE: Write operation at least can write data to memory cache
 951   //       Discard file writing failure here.
 952   //
 953   mGlobal->LastVariableOffset[StorageType] += VarSize;
 954
 955   //
 956   // Mark the old variable as deleted
 957   //
 958   if (!Reclaimed && !EFI_ERROR (Status) && Variable.CurrPtr != NULL) {
 959     State = Variable.CurrPtr->State;
 960     State &= VAR_DELETED;
 961
 962     Status = mGlobal->VariableStore[StorageType]->Write (
 963                                                     mGlobal->VariableStore[StorageType],
 964                                                     VARIABLE_MEMBER_OFFSET (State, (UINTN) Variable.CurrPtr - (UINTN) Variable.StartPtr),
 965                                                     sizeof (Variable.CurrPtr->State),
 966                                                     &State
 967                                                     );
 968     //
 969     // NOTE: Write operation at least can write data to memory cache
 970     //       Discard file writing failure here.
 971     //
 972   }
 973
 974   return EFI_SUCCESS;
 975 }
 976
 977 EFI_STATUS
 978 EFIAPI
 979 QueryVariableInfo (
 980   IN  UINT32                 Attributes,
 981   OUT UINT64                 *MaximumVariableStorageSize,
 982   OUT UINT64                 *RemainingVariableStorageSize,
 983   OUT UINT64                 *MaximumVariableSize
 984   )
 985 /*++
 986
 987 Routine Description:
 988
 989   This code returns information about the EFI variables.
 990
 991 Arguments:
 992
 993   Attributes                      Attributes bitmask to specify the type of variables
 994                                   on which to return information.
 995   MaximumVariableStorageSize      Pointer to the maximum size of the storage space available
 996                                   for the EFI variables associated with the attributes specified.
 997   RemainingVariableStorageSize    Pointer to the remaining size of the storage space available
 998                                   for the EFI variables associated with the attributes specified.
 999   MaximumVariableSize             Pointer to the maximum size of the individual EFI variables
1000                                   associated with the attributes specified.
1001
1002 Returns:
1003
1004   EFI STATUS
1005   EFI_INVALID_PARAMETER           - An invalid combination of attribute bits was supplied.
1006   EFI_SUCCESS                     - Query successfully.
1007   EFI_UNSUPPORTED                 - The attribute is not supported on this platform.
1008
1009 --*/
1010 {
1011   VARIABLE_HEADER        *Variable;
1012   VARIABLE_HEADER        *NextVariable;
1013   UINT64                 VariableSize;
1014   VARIABLE_STORE_HEADER  *VariableStoreHeader;
1015
1016   if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {
1017     return EFI_INVALID_PARAMETER;
1018   }
1019
1020   if((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == 0) {
1021     //
1022     // Make sure the Attributes combination is supported by the platform.
1023     //
1024     return EFI_UNSUPPORTED;
1025   }
1026   else if ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == EFI_VARIABLE_RUNTIME_ACCESS) {
1027     //
1028     // Make sure if runtime bit is set, boot service bit is set also.
1029     //
1030     return EFI_INVALID_PARAMETER;
1031   } else if (EfiAtRuntime () && !(Attributes & EFI_VARIABLE_RUNTIME_ACCESS)) {
1032     //
1033     // Make sure RT Attribute is set if we are in Runtime phase.
1034     //
1035     return EFI_INVALID_PARAMETER;
1036   }
1037
1038   VariableStoreHeader = (VARIABLE_STORE_HEADER *) mGlobal->VariableBase[
1039                                 (Attributes & EFI_VARIABLE_NON_VOLATILE) ? NonVolatile : Volatile
1040                                 ];
1041   //
1042   // Now let's fill *MaximumVariableStorageSize *RemainingVariableStorageSize
1043   // with the storage size (excluding the storage header size).
1044   //
1045   *MaximumVariableStorageSize   = VariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER);
1046   *RemainingVariableStorageSize = VariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER);
1047
1048   //
1049   // Let *MaximumVariableSize be MAX_VARIABLE_SIZE with the exception of the variable header size.
1050   //
1051   *MaximumVariableSize = MAX_VARIABLE_SIZE - sizeof (VARIABLE_HEADER);
1052
1053   //
1054   // Harware error record variable needs larger size.
1055   //
1056   if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
1057     *MaximumVariableSize = MAX_HARDWARE_ERROR_VARIABLE_SIZE - sizeof (VARIABLE_HEADER);
1058   }
1059
1060   //
1061   // Point to the starting address of the variables.
1062   //
1063   Variable = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
1064
1065   //
1066   // Now walk through the related variable store.
1067   //
1068   while (IsValidVariableHeader (Variable) && (Variable < GetEndPointer (VariableStoreHeader))) {
1069     NextVariable = GetNextVariablePtr (Variable);
1070     VariableSize = (UINT64) (UINTN) NextVariable - (UINT64) (UINTN) Variable;
1071
1072     if (EfiAtRuntime ()) {
1073       //
1074       // we don't take the state of the variables in mind
1075       // when calculating RemainingVariableStorageSize,
1076       // since the space occupied by variables not marked with
1077       // VAR_ADDED is not allowed to be reclaimed in Runtime.
1078       //
1079       *RemainingVariableStorageSize -= VariableSize;
1080     } else {
1081       //
1082       // Only care about Variables with State VAR_ADDED,because
1083       // the space not marked as VAR_ADDED is reclaimable now.
1084       //
1085       if ((Variable->State == VAR_ADDED) ||
1086           (Variable->State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION))) {
1087         *RemainingVariableStorageSize -= VariableSize;
1088       }
1089     }
1090
1091     //
1092     // Go to the next one
1093     //
1094     Variable = NextVariable;
1095   }
1096
1097   if (*RemainingVariableStorageSize < sizeof (VARIABLE_HEADER)) {
1098     *MaximumVariableSize = 0;
1099   } else if ((*RemainingVariableStorageSize - sizeof (VARIABLE_HEADER)) < *MaximumVariableSize) {
1100     *MaximumVariableSize = *RemainingVariableStorageSize - sizeof (VARIABLE_HEADER);
1101   }
1102
1103   return EFI_SUCCESS;
1104 }
1105
1106 EFI_STATUS
1107 EFIAPI
1108 VariableServiceInitialize (
1109   IN EFI_HANDLE         ImageHandle,
1110   IN EFI_SYSTEM_TABLE   *SystemTable
1111   )
1112 /*++
1113
1114 Routine Description:
1115   This function does initialization for variable services
1116
1117 Arguments:
1118
1119   ImageHandle   - The firmware allocated handle for the EFI image.
1120   SystemTable   - A pointer to the EFI System Table.
1121
1122 Returns:
1123
1124   Status code.
1125
1126   EFI_NOT_FOUND     - Variable store area not found.
1127   EFI_SUCCESS       - Variable services successfully initialized.
1128
1129 --*/
1130 {
1131   EFI_STATUS                      Status;
1132   EFI_HANDLE                      NewHandle;
1133   VS_DEV                          *Dev;
1134   EFI_PEI_HOB_POINTERS            GuidHob;
1135   VARIABLE_HEADER                 *NextVariable;
1136   VARIABLE_STORE_HEADER           *VariableStoreHeader;
1137   EFI_FLASH_MAP_FS_ENTRY_DATA     *FlashMapEntryData;
1138   EFI_FLASH_SUBAREA_ENTRY         VariableStoreEntry;
1139   UINT64                          BaseAddress;
1140   UINT64                          Length;
1141   EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
1142
1143   Status = gBS->AllocatePool (
1144                   EfiRuntimeServicesData,
1145                   (UINTN) sizeof (VARIABLE_GLOBAL),
1146                   &mGlobal
1147                   );
1148   if (EFI_ERROR (Status)) {
1149     return Status;
1150   }
1151
1152   GuidHob.Raw = GetHobList ();
1153   FlashMapEntryData = NULL;
1154   while ((GuidHob.Raw = GetNextGuidHob (&gEfiFlashMapHobGuid, GuidHob.Raw)) != NULL) {
1155     FlashMapEntryData = (EFI_FLASH_MAP_FS_ENTRY_DATA *) GET_GUID_HOB_DATA (GuidHob.Guid);
1156     if (FlashMapEntryData->AreaType == EFI_FLASH_AREA_EFI_VARIABLES) {
1157       break;
1158     }
1159     GuidHob.Raw = GET_NEXT_HOB (GuidHob);
1160   }
1161
1162   if (FlashMapEntryData == NULL) {
1163     DEBUG ((EFI_D_ERROR, "FSVariable: Could not find flash area for variable!\n"));
1164     Status = EFI_NOT_FOUND;
1165     return Status;
1166   }
1167
1168   CopyMem(
1169     (VOID*)&VariableStoreEntry,
1170     (VOID*)&FlashMapEntryData->Entries[0],
1171     sizeof(EFI_FLASH_SUBAREA_ENTRY)
1172     );
1173
1174   //
1175   // Mark the variable storage region of the FLASH as RUNTIME
1176   //
1177   BaseAddress = VariableStoreEntry.Base & (~EFI_PAGE_MASK);
1178   Length      = VariableStoreEntry.Length + (VariableStoreEntry.Base - BaseAddress);
1179   Length      = (Length + EFI_PAGE_SIZE - 1) & (~EFI_PAGE_MASK);
1180   Status      = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor);
1181   if (EFI_ERROR (Status)) {
1182     Status = EFI_UNSUPPORTED;
1183     return Status;
1184   }
1185   Status = gDS->SetMemorySpaceAttributes (
1186                   BaseAddress,
1187                   Length,
1188                   GcdDescriptor.Attributes | EFI_MEMORY_RUNTIME
1189                   );
1190   if (EFI_ERROR (Status)) {
1191     Status = EFI_UNSUPPORTED;
1192     return Status;
1193   }
1194
1195   Status = FileStorageConstructor (
1196              &mGlobal->VariableStore[NonVolatile],
1197              &mGlobal->GoVirtualChildEvent[NonVolatile],
1198              VariableStoreEntry.Base,
1199              (UINT32) VariableStoreEntry.Length,
1200              FlashMapEntryData->VolumeId,
1201              FlashMapEntryData->FilePath
1202              );
1203   ASSERT_EFI_ERROR (Status);
1204
1205   //
1206   // Volatile Storage
1207   //
1208   Status = MemStorageConstructor (
1209              &mGlobal->VariableStore[Volatile],
1210              &mGlobal->GoVirtualChildEvent[Volatile],
1211              VOLATILE_VARIABLE_STORE_SIZE
1212              );
1213   ASSERT_EFI_ERROR (Status);
1214
1215   //
1216   // Scratch
1217   //
1218   Status = gBS->AllocatePool (
1219                   EfiRuntimeServicesData,
1220                   VARIABLE_SCRATCH_SIZE,
1221                   &mGlobal->Scratch
1222                   );
1223   ASSERT_EFI_ERROR (Status);
1224
1225   //
1226   // 1. NV Storage
1227   //
1228   Dev = DEV_FROM_THIS (mGlobal->VariableStore[NonVolatile]);
1229   VariableStoreHeader = (VARIABLE_STORE_HEADER *) VAR_DATA_PTR (Dev);
1230   if (GetVariableStoreStatus (VariableStoreHeader) == EfiValid) {
1231     if (~VariableStoreHeader->Size == 0) {
1232       VariableStoreHeader->Size = (UINT32) VariableStoreEntry.Length;
1233     }
1234   }
1235   //
1236   // Calculate LastVariableOffset
1237   //
1238   NextVariable = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
1239   while (IsValidVariableHeader (NextVariable)) {
1240     NextVariable = GetNextVariablePtr (NextVariable);
1241   }
1242   mGlobal->LastVariableOffset[NonVolatile] = (UINTN) NextVariable - (UINTN) VariableStoreHeader;
1243   mGlobal->VariableBase[NonVolatile] = VariableStoreHeader;
1244
1245   //
1246   // Reclaim if remaining space is too small
1247   //
1248   if ((VariableStoreHeader->Size - mGlobal->LastVariableOffset[NonVolatile]) < VARIABLE_RECLAIM_THRESHOLD) {
1249     Status = Reclaim (NonVolatile, NULL);
1250     if (EFI_ERROR (Status)) {
1251       //
1252       // Reclaim error
1253       // we cannot restore to original state
1254       //
1255       DEBUG ((EFI_D_ERROR, "FSVariable: Recalim error (fetal error) - %r\n", Status));
1256       ASSERT_EFI_ERROR (Status);
1257     }
1258   }
1259
1260   //
1261   // 2. Volatile Storage
1262   //
1263   Dev = DEV_FROM_THIS (mGlobal->VariableStore[Volatile]);
1264   VariableStoreHeader = (VARIABLE_STORE_HEADER *) VAR_DATA_PTR (Dev);
1265   mGlobal->VariableBase[Volatile] = VAR_DATA_PTR (Dev);
1266   mGlobal->LastVariableOffset[Volatile] = sizeof (VARIABLE_STORE_HEADER);
1267   //
1268   // init store_header & body in memory.
1269   //
1270   mGlobal->VariableStore[Volatile]->Erase (mGlobal->VariableStore[Volatile]);
1271   mGlobal->VariableStore[Volatile]->Write (
1272                                    mGlobal->VariableStore[Volatile],
1273                                    0,
1274                                    sizeof (VARIABLE_STORE_HEADER),
1275                                    &mStoreHeaderTemplate
1276                                    );
1277
1278
1279   SystemTable->RuntimeServices->GetVariable         = GetVariable;
1280   SystemTable->RuntimeServices->GetNextVariableName = GetNextVariableName;
1281   SystemTable->RuntimeServices->SetVariable         = SetVariable;
1282
1283   SystemTable->RuntimeServices->QueryVariableInfo   = QueryVariableInfo;
1284
1285   //
1286   // Now install the Variable Runtime Architectural Protocol on a new handle
1287   //
1288   NewHandle = NULL;
1289   Status = gBS->InstallMultipleProtocolInterfaces (
1290                   &NewHandle,
1291                   &gEfiVariableArchProtocolGuid,
1292                   NULL,
1293                   &gEfiVariableWriteArchProtocolGuid,
1294                   NULL,
1295                   NULL
1296                   );
1297   ASSERT_EFI_ERROR (Status);
1298
1299   return Status;
1300
1301 //Shutdown:
1302 //  EfiShutdownRuntimeDriverLib ();
1303 //  return Status;
1304 }
1305
1306
1307
1308 STATIC
1309 VOID
1310 EFIAPI
1311 OnVirtualAddressChange (
1312   IN EFI_EVENT        Event,
1313   IN VOID             *Context
1314   )
1315 {
1316   UINTN Index;
1317
1318   for (Index = 0; Index < MaxType; Index++) {
1319     mGlobal->GoVirtualChildEvent[Index] (Event, mGlobal->VariableStore[Index]);
1320     EfiConvertPointer (0, &mGlobal->VariableStore[Index]);
1321     EfiConvertPointer (0, &mGlobal->VariableBase[Index]);
1322   }
1323   EfiConvertPointer (0, &mGlobal->Scratch);
1324   EfiConvertPointer (0, &mGlobal);
1325 }