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Driver eXecution Environment. In the Tiano and PI architecture, the phase which follows PEI and precedes BDS.

The Driver Execution Environment (DXE) phase contains an implementation of UEFI that is compliant with the UEFI 2.0+ Specification. As a result, both the DXE Foundation and DXE drivers share many of the attributes of UEFI images. The DXE phase is the phase where most of the system initialization is performed. The Pre-EFI Initialization (PEI) phase is responsible for initializing permanent memory in the platform so the DXE phase can be loaded and executed. The state of the system at the end of the PEI phase is passed to the DXE phase through a list of position-independent data structures called Hand-Off Blocks (HOBs).

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