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      1 /*++ @file
      2 
      3 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
      4 Portions copyright (c) 2011, Apple Inc. All rights reserved.
      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 
     17 #include <Library/DebugLib.h>
     18 #include <Library/HobLib.h>
     19 #include <Library/EmuThunkLib.h>
     20 #include <Library/BaseMemoryLib.h>
     21 
     22 EMU_THUNK_PROTOCOL   *gEmuThunk = NULL;
     23 
     24 
     25 /**
     26   The constructor function caches the pointer of EMU Thunk protocol.
     27 
     28   @param  ImageHandle   The firmware allocated handle for the EFI image.
     29   @param  SystemTable   A pointer to the EFI System Table.
     30 
     31   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
     32 
     33 **/
     34 EFI_STATUS
     35 EFIAPI
     36 DxeEmuLibConstructor (
     37   IN EFI_HANDLE        ImageHandle,
     38   IN EFI_SYSTEM_TABLE  *SystemTable
     39   )
     40 {
     41   EFI_HOB_GUID_TYPE        *GuidHob;
     42 
     43   GuidHob = GetFirstGuidHob (&gEmuThunkProtocolGuid);
     44   ASSERT (GuidHob != NULL);
     45 
     46   gEmuThunk = (EMU_THUNK_PROTOCOL *)(*(UINTN *)(GET_GUID_HOB_DATA (GuidHob)));
     47   ASSERT (gEmuThunk != NULL);
     48 
     49   return EFI_SUCCESS;
     50 }
     51 
     52 
     53 /**
     54   Serach the EMU IO Thunk database for a matching EMU IO Thunk
     55   Protocol instance.
     56 
     57   @param  Protocol   Protocol to search for.
     58   @param  Instance   Instance of protocol to search for.
     59 
     60   @retval NULL       Protocol and Instance not found.
     61   @retval other      EMU IO Thunk protocol that matched.
     62 
     63 **/
     64 EMU_IO_THUNK_PROTOCOL *
     65 EFIAPI
     66 GetIoThunkInstance (
     67   IN  EFI_GUID  *Protocol,
     68   IN  UINTN     Instance
     69   )
     70 {
     71   EFI_STATUS              Status;
     72   EMU_IO_THUNK_PROTOCOL   *EmuIoThunk;
     73 
     74   for (Status = EFI_SUCCESS, EmuIoThunk = NULL; !EFI_ERROR (Status); ) {
     75     Status = gEmuThunk->GetNextProtocol (FALSE, &EmuIoThunk);
     76     if (EFI_ERROR (Status)) {
     77       break;
     78     }
     79 
     80     if (EmuIoThunk->Instance == Instance) {
     81       if (CompareGuid (EmuIoThunk->Protocol, Protocol)) {
     82         return EmuIoThunk;
     83       }
     84     }
     85   }
     86 
     87   return NULL;
     88 }