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   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "PiDxe.h"
  16 #include <Library/DebugLib.h>
  17 #include <Library/PcdLib.h>
  18 #include <Library/PlatformFvbLib.h>
  19 #include <Library/UefiBootServicesTableLib.h>
  20 #include <Library/UefiRuntimeLib.h>
  21
  22
  23 /**
  24   This function will be called following a call to the
  25   EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL Write function.
  26
  27   @param[in] This     EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.
  28   @param[in] Lba      The starting logical block index to written to.
  29   @param[in] Offset   Offset into the block at which to begin writing.
  30   @param[in] NumBytes The number of bytes written.
  31   @param[in] Buffer   Pointer to the buffer that was written.
  32
  33 **/
  34 VOID
  35 EFIAPI
  36 PlatformFvbDataWritten (
  37   IN CONST  EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL *This,
  38   IN        EFI_LBA                             Lba,
  39   IN        UINTN                               Offset,
  40   IN        UINTN                               NumBytes,
  41   IN        UINT8                               *Buffer
  42   )
  43 {
  44   STATIC EFI_EVENT EventToSignal = NULL;
  45
  46   if (!EfiAtRuntime ()) {
  47     if (EventToSignal == NULL) {
  48       EventToSignal = (EFI_EVENT)(UINTN) PcdGet64 (PcdEmuVariableEvent);
  49     }
  50     if (EventToSignal != NULL) {
  51       gBS->SignalEvent (EventToSignal);
  52     }
  53   }
  54 }
  55
  56