mirror of https://github.com/acidanthera/audk.git
81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*++ @file
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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Portions copyright (c) 2011, Apple Inc. All rights reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiDxe.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/EmuThunkLib.h>
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#include <Library/BaseMemoryLib.h>
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EMU_THUNK_PROTOCOL *gEmuThunk = NULL;
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/**
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The constructor function caches the pointer of EMU Thunk protocol.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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DxeEmuLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_HOB_GUID_TYPE *GuidHob;
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GuidHob = GetFirstGuidHob (&gEmuThunkProtocolGuid);
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ASSERT (GuidHob != NULL);
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gEmuThunk = (EMU_THUNK_PROTOCOL *)(*(UINTN *)(GET_GUID_HOB_DATA (GuidHob)));
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ASSERT (gEmuThunk != NULL);
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return EFI_SUCCESS;
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}
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/**
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Serach the EMU IO Thunk database for a matching EMU IO Thunk
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Protocol instance.
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@param Protocol Protocol to search for.
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@param Instance Instance of protocol to search for.
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@retval NULL Protocol and Instance not found.
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@retval other EMU IO Thunk protocol that matched.
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**/
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EMU_IO_THUNK_PROTOCOL *
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EFIAPI
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GetIoThunkInstance (
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IN EFI_GUID *Protocol,
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IN UINTN Instance
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)
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{
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EFI_STATUS Status;
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EMU_IO_THUNK_PROTOCOL *EmuIoThunk;
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for (Status = EFI_SUCCESS, EmuIoThunk = NULL; !EFI_ERROR (Status); ) {
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Status = gEmuThunk->GetNextProtocol (FALSE, &EmuIoThunk);
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if (EFI_ERROR (Status)) {
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break;
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}
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if (EmuIoThunk->Instance == Instance) {
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if (CompareGuid (EmuIoThunk->Protocol, Protocol)) {
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return EmuIoThunk;
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}
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}
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}
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return NULL;
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}
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