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The Hand-Off Blocks (HOBs) are data structures used in the Tiano and PI architecture to pass information from the PEI phase to the DXE phase. The PEI Foundation and other PEIMs produce HOBs. The DXE Foundation and DXE drivers can process information passed in HOBs.

Each HOB begins with a header with the format EFI_HOB_GENERIC_HEADER, which specifies the HOB type and the size of the entire data structure. The format of the remaining HOB data is determined by the HobType member field.

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