2 Emulator Thunk to abstract OS services from pure EFI code
4 Copyright (c) 2008 - 2011, Apple Inc. All rights reserved.<BR>
5 Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
7 SPDX-License-Identifier: BSD-2-Clause-Patent
12 #include <Library/BaseLib.h>
13 #include <Library/BaseMemoryLib.h>
14 #include <Library/DebugLib.h>
15 #include <Library/MemoryAllocationLib.h>
17 #include <Protocol/EmuIoThunk.h>
20 #define EMU_IO_THUNK_PROTOCOL_DATA_SIGNATURE SIGNATURE_32('E','m','u','T')
24 EMU_IO_THUNK_PROTOCOL Data
;
27 } EMU_IO_THUNK_PROTOCOL_DATA
;
29 LIST_ENTRY mThunkList
= INITIALIZE_LIST_HEAD_VARIABLE (mThunkList
);
35 IN EMU_IO_THUNK_PROTOCOL
*ThunkIo
,
36 IN CHAR16
*ConfigString
,
37 IN BOOLEAN EmuBusDriver
43 EMU_IO_THUNK_PROTOCOL_DATA
*Private
;
45 if (ThunkIo
== NULL
) {
46 return EFI_INVALID_PARAMETER
;
50 StartString
= AllocatePool (StrSize (ConfigString
));
51 StrCpy (StartString
, ConfigString
);
52 while (*StartString
!= '\0') {
55 // Find the end of the sub string
57 SubString
= StartString
;
58 while (*SubString
!= '\0' && *SubString
!= '!') {
62 if (*SubString
== '!') {
64 // Replace token with '\0' to make sub strings. If this is the end
65 // of the string SubString will already point to NULL.
71 Private
= AllocatePool (sizeof (EMU_IO_THUNK_PROTOCOL_DATA
));
72 if (Private
== NULL
) {
73 return EFI_OUT_OF_RESOURCES
;
75 Private
->Signature
= EMU_IO_THUNK_PROTOCOL_DATA_SIGNATURE
;
76 Private
->EmuBusDriver
= EmuBusDriver
;
78 CopyMem (&Private
->Data
, ThunkIo
, sizeof (EMU_IO_THUNK_PROTOCOL
));
79 Private
->Data
.Instance
= (UINT16
)Instance
++;
80 Private
->Data
.ConfigString
= StartString
;
82 InsertTailList (&mThunkList
, &Private
->Link
);
85 // Parse Next sub string. This will point to '\0' if we are at the end.
87 StartString
= SubString
;
96 GetNextThunkProtocol (
97 IN BOOLEAN EmuBusDriver
,
98 OUT EMU_IO_THUNK_PROTOCOL
**Instance OPTIONAL
102 EMU_IO_THUNK_PROTOCOL_DATA
*Private
;
104 if (mThunkList
.ForwardLink
== &mThunkList
) {
105 // Skip parsing an empty list
106 return EFI_NOT_FOUND
;
109 for (Link
= mThunkList
.ForwardLink
; Link
!= &mThunkList
; Link
= Link
->ForwardLink
) {
110 Private
= CR (Link
, EMU_IO_THUNK_PROTOCOL_DATA
, Link
, EMU_IO_THUNK_PROTOCOL_DATA_SIGNATURE
);
111 if (EmuBusDriver
& !Private
->EmuBusDriver
) {
113 } else if (*Instance
== NULL
) {
114 // Find 1st match in list
115 *Instance
= &Private
->Data
;
117 } else if (*Instance
== &Private
->Data
) {
118 // Matched previous call so look for valid next entry
119 Link
= Link
->ForwardLink
;
120 if (Link
== &mThunkList
) {
121 return EFI_NOT_FOUND
;
123 Private
= CR (Link
, EMU_IO_THUNK_PROTOCOL_DATA
, Link
, EMU_IO_THUNK_PROTOCOL_DATA_SIGNATURE
);
124 *Instance
= &Private
->Data
;
130 return EFI_NOT_FOUND
;