fwblockservice.c

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/*++

Copyright (c) 2004 - 2006, Intel Corporation                                                         
All rights reserved. This program and the accompanying materials                          
are licensed and made available under the terms and conditions of the BSD License         
which accompanies this distribution.  The full text of the license may be found at        
http://opensource.org/licenses/bsd-license.php                                            
                                                                                          
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             

Module Name:

  FWBlockService.c
    
Abstract:

Revision History

--*/

#include "FWBlockService.h"

ESAL_FWB_GLOBAL         *mFvbModuleGlobal;

EFI_FW_VOL_BLOCK_DEVICE mFvbDeviceTemplate = {
  FVB_DEVICE_SIGNATURE,
  {
    {
      {
        HARDWARE_DEVICE_PATH,
        HW_MEMMAP_DP,
        {
          sizeof (MEMMAP_DEVICE_PATH),
          0
        }
      },
      EfiMemoryMappedIO,
      0,
      0,
    },
    {
      END_DEVICE_PATH_TYPE,
      END_ENTIRE_DEVICE_PATH_SUBTYPE,
      {
        sizeof (EFI_DEVICE_PATH_PROTOCOL),
        0
      }
    }
  },
  0,
  {
    FvbProtocolGetAttributes,
    FvbProtocolSetAttributes,
    FvbProtocolGetPhysicalAddress,
    FvbProtocolGetBlockSize,
    FvbProtocolRead,
    FvbProtocolWrite,
    FvbProtocolEraseBlocks,
    NULL
  },
  {
    FvbExtendProtocolEraseCustomBlockRange
  }
};

EFI_DRIVER_ENTRY_POINT (FvbInitialize)

EFI_RUNTIMESERVICE
VOID
EFIAPI
FvbVirtualddressChangeEvent (
  IN EFI_EVENT        Event,
  IN VOID             *Context
  )
/*++

Routine Description:

  Fixup internal data so that EFI and SAL can be call in virtual mode.
  Call the passed in Child Notify event and convert the mFvbModuleGlobal
  date items to there virtual address.

  mFvbModuleGlobal->FvInstance[FVB_PHYSICAL]  - Physical copy of instance data
  mFvbModuleGlobal->FvInstance[FVB_VIRTUAL]   - Virtual pointer to common 
                                                instance data.

Arguments:

  (Standard EFI notify event - EFI_EVENT_NOTIFY)

Returns: 

  None

--*/
{
  EFI_FW_VOL_INSTANCE *FwhInstance;
  UINTN               Index;

  EfiConvertPointer (EFI_INTERNAL_POINTER, (VOID **) &mFvbModuleGlobal->FvInstance[FVB_VIRTUAL]);

  //
  // Convert the base address of all the instances
  //
  Index       = 0;
  FwhInstance = mFvbModuleGlobal->FvInstance[FVB_PHYSICAL];
  while (Index < mFvbModuleGlobal->NumFv) {
    EfiConvertPointer (EFI_INTERNAL_POINTER, (VOID **) &FwhInstance->FvBase[FVB_VIRTUAL]);
    FwhInstance = (EFI_FW_VOL_INSTANCE *)
      (
        (UINTN) ((UINT8 *) FwhInstance) + FwhInstance->VolumeHeader.HeaderLength +
          (sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER))
      );
    Index++;
  }

  EfiConvertPointer (EFI_INTERNAL_POINTER, (VOID **) &mFvbModuleGlobal->FvbScratchSpace[FVB_VIRTUAL]);
  EfiConvertPointer (EFI_INTERNAL_POINTER, (VOID **) &mFvbModuleGlobal);
}

EFI_STATUS
GetFvbInstance (
  IN  UINTN                               Instance,
  IN  ESAL_FWB_GLOBAL                     *Global,
  OUT EFI_FW_VOL_INSTANCE                 **FwhInstance,
  IN BOOLEAN                              Virtual
  )
/*++

Routine Description:
  Retrieves the physical address of a memory mapped FV

Arguments:
  Instance              - The FV instance whose base address is going to be
                          returned
  Global                - Pointer to ESAL_FWB_GLOBAL that contains all
                          instance data
  FwhInstance           - The EFI_FW_VOL_INSTANCE fimrware instance structure
  Virtual               - Whether CPU is in virtual or physical mode

Returns: 
  EFI_SUCCESS           - Successfully returns
  EFI_INVALID_PARAMETER - Instance not found

--*/
{
  EFI_FW_VOL_INSTANCE *FwhRecord;

  if (Instance >= Global->NumFv) {
    return EFI_INVALID_PARAMETER;
  }
  //
  // Find the right instance of the FVB private data
  //
  FwhRecord = Global->FvInstance[Virtual];
  while (Instance > 0) {
    FwhRecord = (EFI_FW_VOL_INSTANCE *)
      (
        (UINTN) ((UINT8 *) FwhRecord) + FwhRecord->VolumeHeader.HeaderLength +
          (sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER))
      );
    Instance--;
  }

  *FwhInstance = FwhRecord;

  return EFI_SUCCESS;
}

EFI_STATUS
FvbGetPhysicalAddress (
  IN UINTN                                Instance,
  OUT EFI_PHYSICAL_ADDRESS                *Address,
  IN ESAL_FWB_GLOBAL                      *Global,
  IN BOOLEAN                              Virtual
  )
/*++

Routine Description:
  Retrieves the physical address of a memory mapped FV

Arguments:
  Instance              - The FV instance whose base address is going to be
                          returned
  Address               - Pointer to a caller allocated EFI_PHYSICAL_ADDRESS 
                          that on successful return, contains the base address
                          of the firmware volume. 
  Global                - Pointer to ESAL_FWB_GLOBAL that contains all
                          instance data
  Virtual               - Whether CPU is in virtual or physical mode

Returns: 
  EFI_SUCCESS           - Successfully returns
  EFI_INVALID_PARAMETER - Instance not found

--*/
{
  EFI_FW_VOL_INSTANCE *FwhInstance;
  EFI_STATUS          Status;

  //
  // Find the right instance of the FVB private data
  //
  Status = GetFvbInstance (Instance, Global, &FwhInstance, Virtual);
  ASSERT_EFI_ERROR (Status);
  *Address = FwhInstance->FvBase[Virtual];

  return EFI_SUCCESS;
}

EFI_STATUS
FvbGetVolumeAttributes (
  IN UINTN                                Instance,
  OUT EFI_FVB_ATTRIBUTES                  *Attributes,
  IN ESAL_FWB_GLOBAL                      *Global,
  IN BOOLEAN                              Virtual
  )
/*++

Routine Description:
  Retrieves attributes, insures positive polarity of attribute bits, returns
  resulting attributes in output parameter

Arguments:
  Instance              - The FV instance whose attributes is going to be 
                          returned
  Attributes            - Output buffer which contains attributes
  Global                - Pointer to ESAL_FWB_GLOBAL that contains all
                          instance data
  Virtual               - Whether CPU is in virtual or physical mode

Returns: 
  EFI_SUCCESS           - Successfully returns
  EFI_INVALID_PARAMETER - Instance not found

--*/
{
  EFI_FW_VOL_INSTANCE *FwhInstance;
  EFI_STATUS          Status;

  //
  // Find the right instance of the FVB private data
  //
  Status = GetFvbInstance (Instance, Global, &FwhInstance, Virtual);
  ASSERT_EFI_ERROR (Status);
  *Attributes = FwhInstance->VolumeHeader.Attributes;

  return EFI_SUCCESS;
}

EFI_STATUS
FvbGetLbaAddress (
  IN  UINTN                               Instance,
  IN  EFI_LBA                             Lba,
  OUT UINTN                               *LbaAddress,
  OUT UINTN                               *LbaLength,
  OUT UINTN                               *NumOfBlocks,
  IN  ESAL_FWB_GLOBAL                     *Global,
  IN  BOOLEAN                             Virtual
  )
/*++

Routine Description:
  Retrieves the starting address of an LBA in an FV

Arguments:
  Instance              - The FV instance which the Lba belongs to
  Lba                   - The logical block address
  LbaAddress            - On output, contains the physical starting address 
                          of the Lba
  LbaLength             - On output, contains the length of the block
  NumOfBlocks           - A pointer to a caller allocated UINTN in which the
                          number of consecutive blocks starting with Lba is
                          returned. All blocks in this range have a size of
                          BlockSize
  Global                - Pointer to ESAL_FWB_GLOBAL that contains all
                          instance data
  Virtual               - Whether CPU is in virtual or physical mode

Returns: 
  EFI_SUCCESS           - Successfully returns
  EFI_INVALID_PARAMETER - Instance not found

--*/
{
  UINT32                  NumBlocks;
  UINT32                  BlockLength;
  UINTN                   Offset;
  EFI_LBA                 StartLba;
  EFI_LBA                 NextLba;
  EFI_FW_VOL_INSTANCE     *FwhInstance;
  EFI_FV_BLOCK_MAP_ENTRY  *BlockMap;
  EFI_STATUS              Status;

  //
  // Find the right instance of the FVB private data
  //
  Status = GetFvbInstance (Instance, Global, &FwhInstance, Virtual);
  ASSERT_EFI_ERROR (Status);

  StartLba  = 0;
  Offset    = 0;
  BlockMap  = &(FwhInstance->VolumeHeader.FvBlockMap[0]);

  //
  // Parse the blockmap of the FV to find which map entry the Lba belongs to
  //
  while (TRUE) {
    NumBlocks   = BlockMap->NumBlocks;
    BlockLength = BlockMap->BlockLength;

    if (NumBlocks == 0 || BlockLength == 0) {
      return EFI_INVALID_PARAMETER;
    }

    NextLba = StartLba + NumBlocks;

    //
    // The map entry found
    //
    if (Lba >= StartLba && Lba < NextLba) {
      Offset = Offset + (UINTN) MultU64x32 ((Lba - StartLba), BlockLength);
      if (LbaAddress != NULL) {
        *LbaAddress = FwhInstance->FvBase[Virtual] + Offset;
      }

      if (LbaLength != NULL) {
        *LbaLength = BlockLength;
      }

      if (NumOfBlocks != NULL) {
        *NumOfBlocks = (UINTN) (NextLba - Lba);
      }

      return EFI_SUCCESS;
    }

    StartLba  = NextLba;
    Offset    = Offset + NumBlocks * BlockLength;
    BlockMap++;
  }
}

EFI_STATUS
FvbReadBlock (
  IN UINTN                                Instance,
  IN EFI_LBA                              Lba,
  IN UINTN                                BlockOffset,
  IN OUT UINTN                            *NumBytes,
  IN UINT8                                *Buffer,
  IN ESAL_FWB_GLOBAL                      *Global,
  IN BOOLEAN                              Virtual
  )
/*++

Routine Description:
  Reads specified number of bytes into a buffer from the specified block

Arguments:
  Instance              - The FV instance to be read from
  Lba                   - The logical block address to be read from
  BlockOffset           - Offset into the block at which to begin reading
  NumBytes              - Pointer that on input contains the total size of
                          the buffer. On output, it contains the total number
                          of bytes read
  Buffer                - Pointer to a caller allocated buffer that will be
                          used to hold the data read
  Global                - Pointer to ESAL_FWB_GLOBAL that contains all
                          instance data
  Virtual               - Whether CPU is in virtual or physical mode

Returns: 
  EFI_SUCCESS           - The firmware volume was read successfully and 
                          contents are in Buffer
  EFI_BAD_BUFFER_SIZE   - Read attempted across a LBA boundary. On output,
                          NumBytes contains the total number of bytes returned
                          in Buffer
  EFI_ACCESS_DENIED     - The firmware volume is in the ReadDisabled state