EmulatorPkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / EmulatorPkg / Library / ThunkProtocolList / ThunkProtocolList.c

/** @file\r
  Emulator Thunk to abstract OS services from pure EFI code\r
\r
  Copyright (c) 2008 - 2011, Apple Inc. All rights reserved.<BR>\r
  Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Uefi.h>\r
#include <Library/BaseLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
\r
#include <Protocol/EmuIoThunk.h>\r
\r
\r
#define EMU_IO_THUNK_PROTOCOL_DATA_SIGNATURE SIGNATURE_32('E','m','u','T')\r
\r
typedef struct {\r
  UINTN                 Signature;\r
  EMU_IO_THUNK_PROTOCOL Data;\r
  BOOLEAN               EmuBusDriver;\r
  LIST_ENTRY            Link;\r
} EMU_IO_THUNK_PROTOCOL_DATA;\r
\r
LIST_ENTRY  mThunkList = INITIALIZE_LIST_HEAD_VARIABLE (mThunkList);\r
\r
\r
EFI_STATUS\r
EFIAPI\r
AddThunkProtocol (\r
  IN  EMU_IO_THUNK_PROTOCOL   *ThunkIo,\r
  IN  CHAR16                  *ConfigString,\r
  IN  BOOLEAN                 EmuBusDriver\r
  )\r
{\r
  CHAR16                      *StartString;\r
  CHAR16                      *SubString;\r
  UINTN                       Instance;\r
  EMU_IO_THUNK_PROTOCOL_DATA  *Private;\r
\r
  if (ThunkIo == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  Instance = 0;\r
  StartString = AllocatePool (StrSize (ConfigString));\r
  StrCpy (StartString, ConfigString);\r
  while (*StartString != '\0') {\r
\r
    //\r
    // Find the end of the sub string\r
    //\r
    SubString = StartString;\r
    while (*SubString != '\0' && *SubString != '!') {\r
      SubString++;\r
    }\r
\r
    if (*SubString == '!') {\r
      //\r
      // Replace token with '\0' to make sub strings. If this is the end\r
      //  of the string SubString will already point to NULL.\r
      //\r
      *SubString = '\0';\r
      SubString++;\r
    }\r
\r
    Private = AllocatePool (sizeof (EMU_IO_THUNK_PROTOCOL_DATA));\r
    if (Private == NULL) {\r
      return EFI_OUT_OF_RESOURCES;\r
    }\r
    Private->Signature          = EMU_IO_THUNK_PROTOCOL_DATA_SIGNATURE;\r
    Private->EmuBusDriver       = EmuBusDriver;\r
\r
    CopyMem (&Private->Data, ThunkIo, sizeof (EMU_IO_THUNK_PROTOCOL));\r
    Private->Data.Instance      = (UINT16)Instance++;\r
    Private->Data.ConfigString  = StartString;\r
\r
    InsertTailList (&mThunkList, &Private->Link);\r
\r
    //\r
    // Parse Next sub string. This will point to '\0' if we are at the end.\r
    //\r
    StartString = SubString;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
\r
EFI_STATUS\r
EFIAPI\r
GetNextThunkProtocol (\r
  IN  BOOLEAN                 EmuBusDriver,\r
  OUT EMU_IO_THUNK_PROTOCOL   **Instance  OPTIONAL\r
  )\r
{\r
  LIST_ENTRY                   *Link;\r
  EMU_IO_THUNK_PROTOCOL_DATA   *Private;\r
\r
  if (mThunkList.ForwardLink == &mThunkList) {\r
    // Skip parsing an empty list\r
    return EFI_NOT_FOUND;\r
  }\r
\r
  for (Link = mThunkList.ForwardLink; Link != &mThunkList; Link = Link->ForwardLink) {\r
    Private = CR (Link, EMU_IO_THUNK_PROTOCOL_DATA, Link, EMU_IO_THUNK_PROTOCOL_DATA_SIGNATURE);\r
    if (EmuBusDriver & !Private->EmuBusDriver) {\r
      continue;\r
    } else if (*Instance == NULL) {\r
      // Find 1st match in list\r
      *Instance = &Private->Data;\r
      return EFI_SUCCESS;\r
    } else if (*Instance == &Private->Data) {\r
      // Matched previous call so look for valid next entry\r
      Link = Link->ForwardLink;\r
      if (Link == &mThunkList) {\r
        return EFI_NOT_FOUND;\r
      }\r
      Private = CR (Link, EMU_IO_THUNK_PROTOCOL_DATA, Link, EMU_IO_THUNK_PROTOCOL_DATA_SIGNATURE);\r
      *Instance = &Private->Data;\r
      return EFI_SUCCESS;\r
    }\r
  }\r
\r
\r
  return EFI_NOT_FOUND;\r
}\r
\r