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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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