DxeEmuLib.c

/*++ @file
 
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2011, Apple Inc. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
 
**/
 
#include <PiDxe.h>
 
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/EmuThunkLib.h>
#include <Library/BaseMemoryLib.h>
 
EMU_THUNK_PROTOCOL  *gEmuThunk = NULL;
 
EFI_STATUS
EFIAPI
DxeEmuLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_HOB_GUID_TYPE  *GuidHob;
 
  GuidHob = GetFirstGuidHob (&gEmuThunkProtocolGuid);
  ASSERT (GuidHob != NULL);
 
  gEmuThunk = (EMU_THUNK_PROTOCOL *)(*(UINTN *)(GET_GUID_HOB_DATA (GuidHob)));
  ASSERT (gEmuThunk != NULL);
 
  return EFI_SUCCESS;
}
 
EMU_IO_THUNK_PROTOCOL *
EFIAPI
GetIoThunkInstance (
  IN  EFI_GUID  *Protocol,
  IN  UINTN     Instance
  )
{
  EFI_STATUS             Status;
  EMU_IO_THUNK_PROTOCOL  *EmuIoThunk;
 
  for (Status = EFI_SUCCESS, EmuIoThunk = NULL; !EFI_ERROR (Status); ) {
    Status = gEmuThunk->GetNextProtocol (FALSE, &EmuIoThunk);
    if (EFI_ERROR (Status)) {
      break;
    }
 
    if (EmuIoThunk->Instance == Instance) {
      if (CompareGuid (EmuIoThunk->Protocol, Protocol)) {
        return EmuIoThunk;
      }
    }
  }
 
  return NULL;
}