OvmfPkg/Library/EmuVariableFvbLib/EmuVariableFvbLib.c

   1 /** @file
   2   OVMF platform customization for EMU Variable FVB driver
   3
   4   Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "PiDxe.h"
  10 #include <Library/DebugLib.h>
  11 #include <Library/PcdLib.h>
  12 #include <Library/PlatformFvbLib.h>
  13 #include <Library/UefiBootServicesTableLib.h>
  14 #include <Library/UefiRuntimeLib.h>
  15
  16 /**
  17   This function will be called following a call to the
  18   EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL Read function.
  19
  20   @param[in] This     The EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL instance.
  21   @param[in] Lba      The starting logical block index
  22                       from which to read.
  23   @param[in] Offset   Offset into the block at which to begin reading.
  24   @param[in] NumBytes The number of bytes read.
  25   @param[in] Buffer   Pointer to the buffer that was read, and will be
  26                       returned to the caller.
  27
  28 **/
  29 VOID
  30 EFIAPI
  31 PlatformFvbDataRead (
  32   IN CONST  EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL  *This,
  33   IN        EFI_LBA                              Lba,
  34   IN        UINTN                                Offset,
  35   IN        UINTN                                NumBytes,
  36   IN        UINT8                                *Buffer
  37   )
  38 {
  39 }
  40
  41 /**
  42   This function will be called following a call to the
  43   EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL Write function.
  44
  45   @param[in] This     EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL instance.
  46   @param[in] Lba      The starting logical block index to written to.
  47   @param[in] Offset   Offset into the block at which to begin writing.
  48   @param[in] NumBytes The number of bytes written.
  49   @param[in] Buffer   Pointer to the buffer that was written.
  50
  51 **/
  52 VOID
  53 EFIAPI
  54 PlatformFvbDataWritten (
  55   IN CONST  EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL  *This,
  56   IN        EFI_LBA                              Lba,
  57   IN        UINTN                                Offset,
  58   IN        UINTN                                NumBytes,
  59   IN        UINT8                                *Buffer
  60   )
  61 {
  62   STATIC EFI_EVENT  EventToSignal = NULL;
  63
  64   if (!EfiAtRuntime ()) {
  65     if (EventToSignal == NULL) {
  66       EventToSignal = (EFI_EVENT)(UINTN)PcdGet64 (PcdEmuVariableEvent);
  67     }
  68
  69     if (EventToSignal != NULL) {
  70       gBS->SignalEvent (EventToSignal);
  71     }
  72   }
  73 }
  74
  75 /**
  76   This function will be called following a call to the
  77   EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL Erase function.
  78
  79   @param This   Indicates the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL
  80                 instance.
  81   @param List   The variable argument list as documented for
  82                 the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL Erase
  83                 function.
  84
  85 **/
  86 VOID
  87 EFIAPI
  88 PlatformFvbBlocksErased (
  89   IN CONST  EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL  *This,
  90   IN  VA_LIST                                    List
  91   )
  92 {
  93 }