/** @file\r
- Public include file for the HOB Library\r
+ Provides services to create and parse HOBs. Only available for PEI\r
+ and DXE module types.\r
\r
- Copyright (c) 2006, Intel Corporation \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
+ 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
- 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
+Copyright (c) 2006 - 2014, 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
- Module Name: HobLib.h\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
#define __HOB_LIB_H__\r
\r
/**\r
- Returns the pointer to the HOB list.\r
+ Returns the pointer to the HOB list.\r
\r
- @return The pointer to the HOB list.\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
\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
+ 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
+ @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
+ @return The next instance of a HOB type from the starting HOB.\r
\r
**/\r
VOID *\r
GetNextHob (\r
IN UINT16 Type,\r
IN CONST VOID *HobStart\r
- )\r
-;\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
+ Returns the first instance of a HOB type among the whole HOB list.\r
\r
- @param Type The HOB type to return.\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
- @return The next instance of a HOB type from the starting HOB.\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
\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
+ 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
- @param Guid The GUID to match with in the HOB list.\r
- @param HobStart A pointer to a Guid.\r
+ If Guid is NULL, then ASSERT().\r
+ If HobStart is NULL, then ASSERT().\r
\r
- @return The next instance of the matched GUID HOB from the starting HOB.\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
GetNextGuidHob (\r
IN CONST EFI_GUID *Guid,\r
IN CONST VOID *HobStart\r
- )\r
-;\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
+ 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
+ @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
+ @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
+\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
- This function builds a HOB for a loaded PE32 module.\r
+ 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
- @param EntryPoint The 64 bit physical address of the module\92s entry point.\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
IN EFI_PHYSICAL_ADDRESS MemoryAllocationModule,\r
IN UINT64 ModuleLength,\r
IN EFI_PHYSICAL_ADDRESS EntryPoint\r
- )\r
-;\r
+ );\r
\r
/**\r
- Builds a HOB that describes a chunk of system memory.\r
+ Builds a HOB that describes a chunk of system memory with Owner GUID.\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
+ @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
+ @param OwnerGUID GUID for the owner of this resource.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+BuildResourceDescriptorWithOwnerHob (\r
+ IN EFI_RESOURCE_TYPE ResourceType,\r
+ IN EFI_RESOURCE_ATTRIBUTE_TYPE ResourceAttribute,\r
+ IN EFI_PHYSICAL_ADDRESS PhysicalStart,\r
+ IN UINT64 NumberOfBytes,\r
+ IN EFI_GUID *OwnerGUID\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
IN EFI_RESOURCE_ATTRIBUTE_TYPE ResourceAttribute,\r
IN EFI_PHYSICAL_ADDRESS PhysicalStart,\r
IN UINT64 NumberOfBytes\r
- )\r
-;\r
+ );\r
\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
+ 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
- @param Guid The GUID to tag the customized HOB.\r
- @param DataLength The size of the data payload for the GUID HOB.\r
+ If Guid is NULL, then ASSERT().\r
+ If there is no additional space for HOB creation, then ASSERT().\r
+ If DataLength > (0xFFF8 - sizeof (EFI_HOB_GUID_TYPE)), then ASSERT().\r
+ HobLength is UINT16 and multiples of 8 bytes, so the max HobLength is 0xFFF8.\r
\r
- @return The start address of GUID HOB data.\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
+ @retval NULL The GUID HOB could not be allocated.\r
+ @retval others The start address of GUID HOB data.\r
\r
**/\r
VOID *\r
BuildGuidHob (\r
IN CONST EFI_GUID *Guid,\r
IN UINTN DataLength\r
- )\r
-;\r
+ );\r
\r
/**\r
- This function builds a customized HOB tagged with a GUID for identification, \r
- copies the input data to the HOB data field, and returns the start address of GUID HOB data.\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 > (0xFFF8 - sizeof (EFI_HOB_GUID_TYPE)), then ASSERT().\r
+ HobLength is UINT16 and multiples of 8 bytes, so the max HobLength is 0xFFF8.\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
+ @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
+ @retval NULL The GUID HOB could not be allocated.\r
+ @retval others The start address of GUID HOB data.\r
\r
**/\r
VOID *\r
IN CONST EFI_GUID *Guid,\r
IN VOID *Data,\r
IN UINTN DataLength\r
- )\r
-;\r
+ );\r
\r
/**\r
- Builds a Firmware Volume HOB.\r
+ Builds a Firmware Volume HOB.\r
\r
- @param BaseAddress The base address of the Firmware Volume.\r
- @param Length The size of the Firmware Volume in bytes.\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
BuildFvHob (\r
IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
IN UINT64 Length\r
- )\r
-;\r
+ );\r
\r
/**\r
- Builds a Capsule Volume HOB.\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
- @param BaseAddress The base address of the Capsule Volume.\r
- @param Length The size of the Capsule Volume in bytes.\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
BuildCvHob (\r
IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
IN UINT64 Length\r
- )\r
-;\r
+ );\r
\r
/**\r
- Builds a HOB for the CPU.\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
- @param SizeOfMemorySpace The maximum physical memory addressability of the processor.\r
- @param SizeOfIoSpace The maximum physical I/O addressability of the processor.\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
BuildCpuHob (\r
IN UINT8 SizeOfMemorySpace,\r
IN UINT8 SizeOfIoSpace\r
- )\r
-;\r
+ );\r
\r
/**\r
- Builds a HOB for the Stack.\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
- @param BaseAddress The 64 bit physical address of the Stack.\r
- @param Length The length of the stack in bytes.\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
BuildStackHob (\r
IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
IN UINT64 Length\r
- )\r
-;\r
+ );\r
\r
/**\r
- Builds a HOB for the BSP store.\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
+ @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
IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
IN UINT64 Length,\r
IN EFI_MEMORY_TYPE MemoryType\r
- )\r
-;\r
+ );\r
\r
/**\r
- Builds a HOB for the memory allocation.\r
+ Builds a HOB for the memory allocation.\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
+ 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
IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
IN UINT64 Length,\r
IN EFI_MEMORY_TYPE MemoryType\r
- )\r
-;\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
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