MdePkg/Library/DxeExtractGuidedSectionLib/DxeExtractGuidedSectionLib.c File Reference


Defines

#define EXTRACT_HANDLER_TABLE_SIZE   0x10

Functions

RETURN_STATUS EFIAPI ReallocateExtractHandlerTable ()
RETURN_STATUS EFIAPI DxeExtractGuidedSectionLibConstructor (IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable)
UINTN EFIAPI ExtractGuidedSectionGetGuidList (OUT GUID **ExtractHandlerGuidTable)
RETURN_STATUS EFIAPI ExtractGuidedSectionRegisterHandlers (IN CONST GUID *SectionGuid, IN EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER GetInfoHandler, IN EXTRACT_GUIDED_SECTION_DECODE_HANDLER DecodeHandler)
RETURN_STATUS EFIAPI ExtractGuidedSectionGetInfo (IN CONST VOID *InputSection, OUT UINT32 *OutputBufferSize, OUT UINT32 *ScratchBufferSize, OUT UINT16 *SectionAttribute)
RETURN_STATUS EFIAPI ExtractGuidedSectionDecode (IN CONST VOID *InputSection, OUT VOID **OutputBuffer, IN VOID *ScratchBuffer, OUT UINT32 *AuthenticationStatus)
RETURN_STATUS EFIAPI ExtractGuidedSectionGetHandlers (IN CONST GUID *SectionGuid, OUT EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER *GetInfoHandler, OUT EXTRACT_GUIDED_SECTION_DECODE_HANDLER *DecodeHandler)

Variables

UINT32 mNumberOfExtractHandler = 0
UINT32 mMaxNumberOfExtractHandler = 0
GUIDmExtractHandlerGuidTable = NULL
EXTRACT_GUIDED_SECTION_DECODE_HANDLERmExtractDecodeHandlerTable = NULL
EXTRACT_GUIDED_SECTION_GET_INFO_HANDLERmExtractGetInfoHandlerTable = NULL

Detailed Description

Provide generic extract guided section functions for Dxe phase.

Copyright (c) 2007 - 2012, Intel Corporation. All rights reserved.
This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at http://opensource.org/licenses/bsd-license.php.

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.


Define Documentation

#define EXTRACT_HANDLER_TABLE_SIZE   0x10


Function Documentation

RETURN_STATUS EFIAPI DxeExtractGuidedSectionLibConstructor ( IN EFI_HANDLE  ImageHandle,
IN EFI_SYSTEM_TABLE SystemTable 
)

Constructor allocates the global memory to store the registered guid and Handler list.

Parameters:
ImageHandle The firmware allocated handle for the EFI image.
SystemTable A pointer to the EFI System Table.
Return values:
RETURN_SUCCESS Allocated the global memory space to store guid and function tables.
RETURN_OUT_OF_RESOURCES Not enough memory to allocate.

References ReallocateExtractHandlerTable().

RETURN_STATUS EFIAPI ExtractGuidedSectionDecode ( IN CONST VOID *  InputSection,
OUT VOID **  OutputBuffer,
IN VOID *  ScratchBuffer,
OUT UINT32 AuthenticationStatus 
)

Retrieves the GUID from a GUIDed section and uses that GUID to select an associated handler of type EXTRACT_GUIDED_SECTION_DECODE_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers(). The selected handler is used to decode the data in a GUIDed section and return the result in a caller allocated output buffer.

Decodes the GUIDed section specified by InputSection. If GUID for InputSection does not match any of the GUIDs registered through ExtractGuidedSectionRegisterHandlers(), then RETURN_UNSUPPORTED is returned. If the GUID of InputSection does match the GUID that this handler supports, then the the associated handler of type EXTRACT_GUIDED_SECTION_DECODE_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers() is used to decode InputSection into the buffer specified by OutputBuffer and the authentication status of this decode operation is returned in AuthenticationStatus. If the decoded buffer is identical to the data in InputSection, then OutputBuffer is set to point at the data in InputSection. Otherwise, the decoded data will be placed in caller allocated buffer specified by OutputBuffer. This function is responsible for computing the EFI_AUTH_STATUS_PLATFORM_OVERRIDE bit of in AuthenticationStatus. The return status from the handler of type EXTRACT_GUIDED_SECTION_DECODE_HANDLER is returned.

If InputSection is NULL, then ASSERT(). If OutputBuffer is NULL, then ASSERT(). If ScratchBuffer is NULL and this decode operation requires a scratch buffer, then ASSERT(). If AuthenticationStatus is NULL, then ASSERT().

Parameters:
[in] InputSection A pointer to a GUIDed section of an FFS formatted file.
[out] OutputBuffer A pointer to a buffer that contains the result of a decode operation.
[in] ScratchBuffer A caller allocated buffer that may be required by this function as a scratch buffer to perform the decode operation.
[out] AuthenticationStatus A pointer to the authentication status of the decoded output buffer. See the definition of authentication status in the EFI_PEI_GUIDED_SECTION_EXTRACTION_PPI section of the PI Specification.
Return values:
RETURN_SUCCESS The buffer specified by InputSection was decoded.
RETURN_UNSUPPORTED The section specified by InputSection does not match the GUID this handler supports.
RETURN_INVALID_PARAMETER The section specified by InputSection can not be decoded.

References ASSERT, CompareGuid(), IS_SECTION2, mExtractDecodeHandlerTable, mNumberOfExtractHandler, NULL, and RETURN_UNSUPPORTED.

UINTN EFIAPI ExtractGuidedSectionGetGuidList ( OUT GUID **  ExtractHandlerGuidTable  ) 

Retrieve the list GUIDs that have been registered through ExtractGuidedSectionRegisterHandlers().

Sets ExtractHandlerGuidTable so it points at a callee allocated array of registered GUIDs. The total number of GUIDs in the array are returned. Since the array of GUIDs is callee allocated and caller must treat this array of GUIDs as read-only data. If ExtractHandlerGuidTable is NULL, then ASSERT().

Parameters:
[out] ExtractHandlerGuidTable A pointer to the array of GUIDs that have been registered through ExtractGuidedSectionRegisterHandlers().
Returns:
The number of the supported extract guided Handler.

References ASSERT, mNumberOfExtractHandler, and NULL.

RETURN_STATUS EFIAPI ExtractGuidedSectionGetHandlers ( IN CONST GUID SectionGuid,
OUT EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER GetInfoHandler,
OUT EXTRACT_GUIDED_SECTION_DECODE_HANDLER DecodeHandler 
)

Retrieves handlers of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER and EXTRACT_GUIDED_SECTION_DECODE_HANDLER for a specific GUID section type.

Retrieves the handlers associated with SectionGuid and returns them in GetInfoHandler and DecodeHandler.

If the GUID value specified by SectionGuid has not been registered, then return RETURN_NOT_FOUND.

If SectionGuid is NULL, then ASSERT().

Parameters:
[in] SectionGuid A pointer to the GUID associated with the handlersof the GUIDed section type being retrieved.
[out] GetInfoHandler Pointer to a function that examines a GUIDed section and returns the size of the decoded buffer and the size of an optional scratch buffer required to actually decode the data in a GUIDed section. This is an optional parameter that may be NULL. If it is NULL, then the previously registered handler is not returned.
[out] DecodeHandler Pointer to a function that decodes a GUIDed section into a caller allocated output buffer. This is an optional parameter that may be NULL. If it is NULL, then the previously registered handler is not returned.
Return values:
RETURN_SUCCESS The handlers were retrieved.
RETURN_NOT_FOUND No handlers have been registered with the specified GUID.

References ASSERT, CompareGuid(), mExtractDecodeHandlerTable, mExtractGetInfoHandlerTable, mNumberOfExtractHandler, NULL, RETURN_NOT_FOUND, and RETURN_SUCCESS.

RETURN_STATUS EFIAPI ExtractGuidedSectionGetInfo ( IN CONST VOID *  InputSection,
OUT UINT32 OutputBufferSize,
OUT UINT32 ScratchBufferSize,
OUT UINT16 SectionAttribute 
)

Retrieves a GUID from a GUIDed section and uses that GUID to select an associated handler of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers(). The selected handler is used to retrieve and return the size of the decoded buffer and the size of an optional scratch buffer required to actually decode the data in a GUIDed section.

Examines a GUIDed section specified by InputSection. If GUID for InputSection does not match any of the GUIDs registered through ExtractGuidedSectionRegisterHandlers(), then RETURN_UNSUPPORTED is returned. If the GUID of InputSection does match the GUID that this handler supports, then the the associated handler of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER that was registered with ExtractGuidedSectionRegisterHandlers() is used to retrieve the OututBufferSize, ScratchSize, and Attributes values. The return status from the handler of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER is returned.

If InputSection is NULL, then ASSERT(). If OutputBufferSize is NULL, then ASSERT(). If ScratchBufferSize is NULL, then ASSERT(). If SectionAttribute is NULL, then ASSERT().

Parameters:
[in] InputSection A pointer to a GUIDed section of an FFS formatted file.
[out] OutputBufferSize A pointer to the size, in bytes, of an output buffer required if the buffer specified by InputSection were decoded.
[out] ScratchBufferSize A pointer to the size, in bytes, required as scratch space if the buffer specified by InputSection were decoded.
[out] SectionAttribute A pointer to the attributes of the GUIDed section. See the Attributes field of EFI_GUID_DEFINED_SECTION in the PI Specification.
Return values:
RETURN_SUCCESS Successfully obtained the required information.
RETURN_UNSUPPORTED The GUID from the section specified by InputSection does not match any of the GUIDs registered with ExtractGuidedSectionRegisterHandlers().
Others The return status from the handler associated with the GUID retrieved from the section specified by InputSection.

References ASSERT, CompareGuid(), IS_SECTION2, mExtractGetInfoHandlerTable, mNumberOfExtractHandler, NULL, and RETURN_UNSUPPORTED.

RETURN_STATUS EFIAPI ExtractGuidedSectionRegisterHandlers ( IN CONST GUID SectionGuid,
IN EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER  GetInfoHandler,
IN EXTRACT_GUIDED_SECTION_DECODE_HANDLER  DecodeHandler 
)

Registers handlers of type EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER and EXTRACT_GUIDED_SECTION_DECODE_HANDLER for a specific GUID section type.

Registers the handlers specified by GetInfoHandler and DecodeHandler with the GUID specified by SectionGuid. If the GUID value specified by SectionGuid has already been registered, then return RETURN_ALREADY_STARTED. If there are not enough resources available to register the handlers then RETURN_OUT_OF_RESOURCES is returned.

If SectionGuid is NULL, then ASSERT(). If GetInfoHandler is NULL, then ASSERT(). If DecodeHandler is NULL, then ASSERT().

Parameters:
[in] SectionGuid A pointer to the GUID associated with the the handlers of the GUIDed section type being registered.
[in] GetInfoHandler The pointer to a function that examines a GUIDed section and returns the size of the decoded buffer and the size of an optional scratch buffer required to actually decode the data in a GUIDed section.
[in] DecodeHandler The pointer to a function that decodes a GUIDed section into a caller allocated output buffer.
Return values:
RETURN_SUCCESS The handlers were registered.
RETURN_OUT_OF_RESOURCES There are not enough resources available to register the handlers.

References AllocateCopyPool(), ASSERT, CompareGuid(), CopyGuid(), gBS, EFI_BOOT_SERVICES::InstallConfigurationTable, mExtractDecodeHandlerTable, mExtractGetInfoHandlerTable, mMaxNumberOfExtractHandler, mNumberOfExtractHandler, NULL, ReallocateExtractHandlerTable(), RETURN_OUT_OF_RESOURCES, RETURN_SUCCESS, and VOID.

RETURN_STATUS EFIAPI ReallocateExtractHandlerTable (  ) 

Reallocates more global memory to store the registered guid and Handler list.

Return values:
RETURN_SUCCESS Reallocated more global memory space to store guid and function tables.
RETURN_OUT_OF_RESOURCES Not enough memory to allocate.

References EXTRACT_HANDLER_TABLE_SIZE, FreePool(), mExtractDecodeHandlerTable, mExtractGetInfoHandlerTable, mMaxNumberOfExtractHandler, NULL, ReallocatePool(), RETURN_OUT_OF_RESOURCES, and RETURN_SUCCESS.

Referenced by DxeExtractGuidedSectionLibConstructor(), and ExtractGuidedSectionRegisterHandlers().


Variable Documentation


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