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
DxeEmuLibConstructor(IN EFI_HANDLE ImageHandle,IN EFI_SYSTEM_TABLE * SystemTable)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
GetIoThunkInstance(IN EFI_GUID * Protocol,IN UINTN Instance)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 }