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[mirror_edk2.git] / MdePkg / Library / DxeHobLib / HobLib.c

/** @file\r
  HOB Library.\r
\r
  Copyright (c) 2006, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
  Module Name:  HobLib.c\r
\r
**/\r
\r
\r
\r
STATIC VOID  *mHobList = NULL;\r
\r
/**\r
  The constructor function caches the pointer to HOB list.\r
  \r
  The constructor function gets the start address of HOB list from system configuration table.\r
  It will ASSERT() if that operation fails and it will always return EFI_SUCCESS. \r
\r
  @param  ImageHandle   The firmware allocated handle for the EFI image.\r
  @param  SystemTable   A pointer to the EFI System Table.\r
  \r
  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
HobLibConstructor (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = EfiGetSystemConfigurationTable (&gEfiHobListGuid, &mHobList);\r
  ASSERT_EFI_ERROR (Status);\r
  ASSERT (mHobList != NULL);\r
  return Status;\r
}\r
\r
/**\r
  Returns the pointer to the HOB list.\r
\r
  None.\r
\r
  The pointer to the HOB list.\r
\r
**/\r
VOID *\r
EFIAPI\r
GetHobList (\r
  VOID\r
  )\r
{\r
  return mHobList;\r
}\r
\r
/**\r
  This function searches the first instance of a HOB type from the starting HOB pointer. \r
  If there does not exist such HOB type from the starting HOB pointer, it will return NULL. \r
\r
  @param  Type The HOB type to return.\r
  @param  HobStart The starting HOB pointer to search from.\r
\r
  @return The next instance of a HOB type from the starting HOB.\r
\r
**/\r
VOID *\r
EFIAPI\r
GetNextHob (\r
  IN UINT16                 Type,\r
  IN CONST VOID             *HobStart\r
  )\r
{\r
  EFI_PEI_HOB_POINTERS  Hob;\r
\r
  ASSERT (HobStart != NULL);\r
   \r
  Hob.Raw = (UINT8 *) HobStart;\r
  //\r
  // Parse the HOB list, stop if end of list or matching type found.\r
  //\r
  while (!END_OF_HOB_LIST (Hob)) {\r
    if (Hob.Header->HobType == Type) {\r
      return Hob.Raw;\r
    }\r
    Hob.Raw = GET_NEXT_HOB (Hob);\r
  }\r
  return NULL;\r
}\r
\r
/**\r
  This function searches the first instance of a HOB type among the whole HOB list. \r
  If there does not exist such HOB type in the HOB list, it will return NULL. \r
\r
  @param  Type The HOB type to return.\r
\r
  @return The next instance of a HOB type from the starting HOB.\r
\r
**/\r
VOID *\r
EFIAPI\r
GetFirstHob (\r
  IN UINT16                 Type\r
  )\r
{\r
  VOID      *HobList;\r
\r
  HobList = GetHobList ();\r
  return GetNextHob (Type, HobList);\r
}\r
\r
/**\r
  This function searches the first instance of a HOB from the starting HOB pointer. \r
  Such HOB should satisfy two conditions: \r
  its HOB type is EFI_HOB_TYPE_GUID_EXTENSION and its GUID Name equals to the input Guid. \r
  If there does not exist such HOB from the starting HOB pointer, it will return NULL. \r
\r
  @param  Guid The GUID to match with in the HOB list.\r
  @param  HobStart A pointer to a Guid.\r
\r
  @return The next instance of the matched GUID HOB from the starting HOB.\r
\r
**/\r
VOID *\r
EFIAPI\r
GetNextGuidHob (\r
  IN CONST EFI_GUID         *Guid,\r
  IN CONST VOID             *HobStart\r
  )\r
{\r
  EFI_PEI_HOB_POINTERS  GuidHob;\r
\r
  GuidHob.Raw = (UINT8 *) HobStart;\r
  while ((GuidHob.Raw = GetNextHob (EFI_HOB_TYPE_GUID_EXTENSION, GuidHob.Raw)) != NULL) {\r
    if (CompareGuid (Guid, &GuidHob.Guid->Name)) {\r
      break;\r
    }\r
    GuidHob.Raw = GET_NEXT_HOB (GuidHob);\r
  }\r
  return GuidHob.Raw;\r
}\r
\r
/**\r
  This function searches the first instance of a HOB among the whole HOB list. \r
  Such HOB should satisfy two conditions:\r
  its HOB type is EFI_HOB_TYPE_GUID_EXTENSION and its GUID Name equals to the input Guid.\r
  If there does not exist such HOB from the starting HOB pointer, it will return NULL.\r
\r
  @param  Guid The GUID to match with in the HOB list.\r
\r
  @return The first instance of the matched GUID HOB among the whole HOB list.\r
\r
**/\r
VOID *\r
EFIAPI\r
GetFirstGuidHob (\r
  IN CONST EFI_GUID         *Guid\r
  )\r
{\r
  VOID      *HobList;\r
\r
  HobList = GetHobList ();\r
  return GetNextGuidHob (Guid, HobList);\r
}\r
\r
/**\r
  This function builds a HOB for a loaded PE32 module.\r
\r
  @param  ModuleName The GUID File Name of the module.\r
  @param  MemoryAllocationModule The 64 bit physical address of the module.\r
  @param  ModuleLength The length of the module in bytes.\r