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[mirror_edk2.git] / MdePkg / Include / Library / HobLib.h

/** @file\r
  Provides services to create and parse HOBs. Only available for PEI\r
  and DXE module types.\r
\r
  The HOB Library supports the efficient creation and searching of HOBs\r
  defined in the PI Specification. \r
  A HOB is a Hand-Off Block, defined in the Framework architecture, that \r
  allows the PEI phase to pass information to the DXE phase. HOBs are position \r
  independent and can be relocated easily to different memory memory locations.\r
\r
Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
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
**/\r
\r
#ifndef __HOB_LIB_H__\r
#define __HOB_LIB_H__\r
\r
/**\r
  Returns the pointer to the HOB list.\r
\r
  This function returns the pointer to first HOB in the list.\r
  For PEI phase, the PEI service GetHobList() can be used to retrieve the pointer \r
  to the HOB list.  For the DXE phase, the HOB list pointer can be retrieved through\r
  the EFI System Table by looking up theHOB list GUID in the System Configuration Table.\r
  Since the System Configuration Table does not exist that the time the DXE Core is \r
  launched, the DXE Core uses a global variable from the DXE Core Entry Point Library \r
  to manage the pointer to the HOB list.\r
  \r
  If the pointer to the HOB list is NULL, then ASSERT().\r
  \r
  @return The pointer to the HOB list.\r
\r
**/\r
VOID *\r
EFIAPI\r
GetHobList (\r
  VOID\r
  );\r
\r
/**\r
  Returns the next instance of a HOB type from the starting HOB.\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
  In contrast with macro GET_NEXT_HOB(), this function does not skip the starting HOB pointer\r
  unconditionally: it returns HobStart back if HobStart itself meets the requirement;\r
  caller is required to use GET_NEXT_HOB() if it wishes to skip current HobStart.\r
  \r
  If HobStart is NULL, then ASSERT().\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
/**\r
  Returns the first instance of a HOB type among the whole HOB list.\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
  If the pointer to the HOB list is NULL, then ASSERT().\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
/**\r
  Returns the next instance of the matched GUID HOB from the starting HOB.\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
  Caller is required to apply GET_GUID_HOB_DATA () and GET_GUID_HOB_DATA_SIZE ()\r
  to extract the data section and its size info respectively.\r
  In contrast with macro GET_NEXT_HOB(), this function does not skip the starting HOB pointer\r
  unconditionally: it returns HobStart back if HobStart itself meets the requirement;\r
  caller is required to use GET_NEXT_HOB() if it wishes to skip current HobStart.\r
  \r
  If Guid is NULL, then ASSERT().\r
  If HobStart is NULL, then ASSERT().\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
/**\r
  Returns the first instance of the matched GUID HOB among the whole HOB list.\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
  Caller is required to apply GET_GUID_HOB_DATA () and GET_GUID_HOB_DATA_SIZE ()\r
  to extract the data section and its size info respectively.\r
  \r
  If the pointer to the HOB list is NULL, then ASSERT().\r
  If Guid is NULL, then ASSERT().\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
/**\r
  Get the system boot mode from the HOB list.\r
\r
  This function returns the system boot mode information from the \r
  PHIT HOB in HOB list.\r
\r
  If the pointer to the HOB list is NULL, then ASSERT().\r
  \r
  @param  VOID\r
\r
  @return The Boot Mode.\r
\r
**/\r
EFI_BOOT_MODE\r
EFIAPI\r
GetBootModeHob (\r
  VOID\r
  );\r
\r
/**\r
  Builds a HOB for a loaded PE32 module.\r
\r
  This function builds a HOB for a loaded PE32 module.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If ModuleName is NULL, then ASSERT().\r
  If there is no additional space for HOB creation, then ASSERT().\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
  @param  EntryPoint              The 64 bit physical address of the module entry point.\r
\r
**/\r
VOID\r
EFIAPI\r
BuildModuleHob (\r
  IN CONST EFI_GUID         *ModuleName,\r
  IN EFI_PHYSICAL_ADDRESS   MemoryAllocationModule,\r
  IN UINT64                 ModuleLength,\r
  IN EFI_PHYSICAL_ADDRESS   EntryPoint\r
  );\r
\r
/**\r
  Builds a HOB that describes a chunk of system memory.\r
\r
  This function builds a HOB that describes a chunk of system memory.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If there is no additional space for HOB creation, then ASSERT().\r
\r
  @param  ResourceType        The type of resource described by this HOB.\r
  @param  ResourceAttribute   The resource attributes of the memory described by this HOB.\r
  @param  PhysicalStart       The 64 bit physical address of memory described by this HOB.\r
  @param  NumberOfBytes       The length of the memory described by this HOB in bytes.\r
\r
**/\r
VOID\r
EFIAPI\r
BuildResourceDescriptorHob (\r
  IN EFI_RESOURCE_TYPE            ResourceType,\r
  IN EFI_RESOURCE_ATTRIBUTE_TYPE  ResourceAttribute,\r
  IN EFI_PHYSICAL_ADDRESS         PhysicalStart,\r
  IN UINT64                       NumberOfBytes\r
  );\r
\r
/**\r
  Builds a customized HOB tagged with a GUID for identification and returns \r
  the start address of GUID HOB data.\r
\r
  This function builds a customized HOB tagged with a GUID for identification \r
  and returns the start address of GUID HOB data so that caller can fill the customized data. \r
  The HOB Header and Name field is already stripped.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If Guid is NULL, then ASSERT().\r
  If there is no additional space for HOB creation, then ASSERT().\r
  If DataLength >= (0x10000 - sizeof (EFI_HOB_GUID_TYPE)), then ASSERT().\r
\r
  @param  Guid          The GUID to tag the customized HOB.\r
  @param  DataLength    The size of the data payload for the GUID HOB.\r
\r
  @return The start address of GUID HOB data.\r
\r
**/\r
VOID *\r
EFIAPI\r
BuildGuidHob (\r
  IN CONST EFI_GUID              *Guid,\r
  IN UINTN                       DataLength\r
  );\r
\r
/**\r
  Builds a customized HOB tagged with a GUID for identification, copies the input data to the HOB \r
  data field, and returns the start address of the GUID HOB data.\r
\r
  This function builds a customized HOB tagged with a GUID for identification and copies the input\r
  data to the HOB data field and returns the start address of the GUID HOB data.  It can only be \r
  invoked during PEI phase; for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.  \r
  The HOB Header and Name field is already stripped.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If Guid is NULL, then ASSERT().\r
  If Data is NULL and DataLength > 0, then ASSERT().\r
  If there is no additional space for HOB creation, then ASSERT().\r
  If DataLength >= (0x10000 - sizeof (EFI_HOB_GUID_TYPE)), then ASSERT().\r
\r
  @param  Guid          The GUID to tag the customized HOB.\r
  @param  Data          The data to be copied into the data field of the GUID HOB.\r
  @param  DataLength    The size of the data payload for the GUID HOB.\r
\r
  @return The start address of GUID HOB data.\r
\r
**/\r
VOID *\r
EFIAPI\r
BuildGuidDataHob (\r
  IN CONST EFI_GUID              *Guid,\r
  IN VOID                        *Data,\r
  IN UINTN                       DataLength\r
  );\r
\r
/**\r
  Builds a Firmware Volume HOB.\r
\r
  This function builds a Firmware Volume HOB.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If there is no additional space for HOB creation, then ASSERT().\r
\r
  @param  BaseAddress   The base address of the Firmware Volume.\r
  @param  Length        The size of the Firmware Volume in bytes.\r
\r
**/\r
VOID\r
EFIAPI\r
BuildFvHob (\r
  IN EFI_PHYSICAL_ADDRESS        BaseAddress,\r
  IN UINT64                      Length\r
  );\r
\r
/**\r
  Builds a EFI_HOB_TYPE_FV2 HOB.\r
\r
  This function builds a EFI_HOB_TYPE_FV2 HOB.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If there is no additional space for HOB creation, then ASSERT().\r
\r
  @param  BaseAddress   The base address of the Firmware Volume.\r
  @param  Length        The size of the Firmware Volume in bytes.\r
  @param  FvName        The name of the Firmware Volume.\r
  @param  FileName      The name of the file.\r
  \r
**/\r
VOID\r
EFIAPI\r
BuildFv2Hob (\r
  IN          EFI_PHYSICAL_ADDRESS        BaseAddress,\r
  IN          UINT64                      Length,\r
  IN CONST    EFI_GUID                    *FvName,\r
  IN CONST    EFI_GUID                    *FileName\r
  );\r
\r
/**\r
  Builds a Capsule Volume HOB.\r
\r
  This function builds a Capsule Volume HOB.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If the platform does not support Capsule Volume HOBs, then ASSERT().\r
  If there is no additional space for HOB creation, then ASSERT().\r
\r
  @param  BaseAddress   The base address of the Capsule Volume.\r
  @param  Length        The size of the Capsule Volume in bytes.\r
\r
**/\r
VOID\r
EFIAPI\r
BuildCvHob (\r
  IN EFI_PHYSICAL_ADDRESS        BaseAddress,\r
  IN UINT64                      Length\r
  );\r
\r
/**\r
  Builds a HOB for the CPU.\r
\r
  This function builds a HOB for the CPU.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If there is no additional space for HOB creation, then ASSERT().\r
\r
  @param  SizeOfMemorySpace   The maximum physical memory addressability of the processor.\r
  @param  SizeOfIoSpace       The maximum physical I/O addressability of the processor.\r
\r
**/\r
VOID\r
EFIAPI\r
BuildCpuHob (\r
  IN UINT8                       SizeOfMemorySpace,\r
  IN UINT8                       SizeOfIoSpace\r
  );\r
\r
/**\r
  Builds a HOB for the Stack.\r
\r
  This function builds a HOB for the stack.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If there is no additional space for HOB creation, then ASSERT().\r
\r
  @param  BaseAddress   The 64 bit physical address of the Stack.\r
  @param  Length        The length of the stack in bytes.\r
\r
**/\r
VOID\r
EFIAPI\r
BuildStackHob (\r
  IN EFI_PHYSICAL_ADDRESS        BaseAddress,\r
  IN UINT64                      Length\r
  );\r
\r
/**\r
  Builds a HOB for the BSP store.\r
\r
  This function builds a HOB for BSP store.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If there is no additional space for HOB creation, then ASSERT().\r
\r
  @param  BaseAddress   The 64 bit physical address of the BSP.\r
  @param  Length        The length of the BSP store in bytes.\r
  @param  MemoryType    Type of memory allocated by this HOB.\r
\r
**/\r
VOID\r
EFIAPI\r
BuildBspStoreHob (\r
  IN EFI_PHYSICAL_ADDRESS        BaseAddress,\r
  IN UINT64                      Length,\r
  IN EFI_MEMORY_TYPE             MemoryType\r
  );\r
\r
/**\r
  Builds a HOB for the memory allocation.\r
\r
  This function builds a HOB for the memory allocation.\r
  It can only be invoked during PEI phase;\r
  for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.\r
  \r
  If there is no additional space for HOB creation, then ASSERT().\r
\r
  @param  BaseAddress   The 64 bit physical address of the memory.\r
  @param  Length        The length of the memory allocation in bytes.\r
  @param  MemoryType    Type of memory allocated by this HOB.\r
\r
**/\r
VOID\r
EFIAPI\r
BuildMemoryAllocationHob (\r
  IN EFI_PHYSICAL_ADDRESS        BaseAddress,\r
  IN UINT64                      Length,\r
  IN EFI_MEMORY_TYPE             MemoryType\r
  );\r
\r
/**\r
  Returns the type of a HOB.\r
\r
  This macro returns the HobType field from the HOB header for the \r
  HOB specified by HobStart.\r
\r
  @param  HobStart   A pointer to a HOB.\r
  \r
  @return HobType.\r
  \r
**/\r
#define GET_HOB_TYPE(HobStart) \\r
  ((*(EFI_HOB_GENERIC_HEADER **)&(HobStart))->HobType)\r
\r
/**\r
  Returns the length, in bytes, of a HOB.\r
\r
  This macro returns the HobLength field from the HOB header for the \r
  HOB specified by HobStart.\r
\r
  @param  HobStart   A pointer to a HOB.\r
\r
  @return HobLength.\r
\r
**/\r
#define GET_HOB_LENGTH(HobStart) \\r
  ((*(EFI_HOB_GENERIC_HEADER **)&(HobStart))->HobLength)\r
\r
/**\r
  Returns a pointer to the next HOB in the HOB list.\r
\r
  This macro returns a pointer to HOB that follows the \r
  HOB specified by HobStart in the HOB List.\r
\r
  @param  HobStart   A pointer to a HOB.\r
\r
  @return A pointer to the next HOB in the HOB list.\r
\r
**/\r
#define GET_NEXT_HOB(HobStart) \\r
  (VOID *)(*(UINT8 **)&(HobStart) + GET_HOB_LENGTH (HobStart))\r
\r
/**\r
  Determines if a HOB is the last HOB in the HOB list.\r
  \r
  This macro determine if the HOB specified by HobStart is the \r
  last HOB in the HOB list.  If HobStart is last HOB in the HOB list, \r
  then TRUE is returned.  Otherwise, FALSE is returned.\r
\r
  @param  HobStart   A pointer to a HOB.\r
\r
  @retval TRUE       The HOB specified by HobStart is the last HOB in the HOB list.\r
  @retval FALSE      The HOB specified by HobStart is not the last HOB in the HOB list.\r
\r
**/\r
#define END_OF_HOB_LIST(HobStart)  (GET_HOB_TYPE (HobStart) == (UINT16)EFI_HOB_TYPE_END_OF_HOB_LIST)\r
\r
/**\r
  Returns a pointer to data buffer from a HOB of type EFI_HOB_TYPE_GUID_EXTENSION.\r
\r
  This macro returns a pointer to the data buffer in a HOB specified by HobStart.\r
  HobStart is assumed to be a HOB of type EFI_HOB_TYPE_GUID_EXTENSION.   \r
\r
  @param   GuidHob   A pointer to a HOB.\r
\r
  @return  A pointer to the data buffer in a HOB.\r
  \r
**/\r
#define GET_GUID_HOB_DATA(HobStart) \\r
  (VOID *)(*(UINT8 **)&(HobStart) + sizeof (EFI_HOB_GUID_TYPE))\r
\r
/**\r
  Returns the size of the data buffer from a HOB of type EFI_HOB_TYPE_GUID_EXTENSION.\r
\r
  This macro returns the size, in bytes, of the data buffer in a HOB specified by HobStart.\r
  HobStart is assumed to be a HOB of type EFI_HOB_TYPE_GUID_EXTENSION.\r
\r
  @param   GuidHob   A pointer to a HOB.\r
\r
  @return  The size of the data buffer.\r
**/\r
#define GET_GUID_HOB_DATA_SIZE(HobStart) \\r
  (UINT16)(GET_HOB_LENGTH (HobStart) - sizeof (EFI_HOB_GUID_TYPE))\r
\r
#endif\r