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- /*++ @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;
- /**
- The constructor function caches the pointer of EMU Thunk protocol.
- @param ImageHandle The firmware allocated handle for the EFI image.
- @param SystemTable A pointer to the EFI System Table.
- @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
- **/
- 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;
- }
- /**
- Serach the EMU IO Thunk database for a matching EMU IO Thunk
- Protocol instance.
- @param Protocol Protocol to search for.
- @param Instance Instance of protocol to search for.
- @retval NULL Protocol and Instance not found.
- @retval other EMU IO Thunk protocol that matched.
- **/
- 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;
- }
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