Abstract: An extensible firmware interface (EFI) framework is to enable hot-plugging and hot-removal of memory devices. The security phase of the EFI may enable a cache to operate as RAM (CAR mode) to support execution of pre-EFI (PEI) tasks. In one embodiment, the PEI phase may move the memory reference code (MRC) as a driver to the driver execution phase and hand-over the CAR information to the driver execution environment (DXE). The MRC driver may be registered as a run-time API, which may be called by the operating system to receive a dynamically created memory map. In other embodiment, the PEI phase executes the MRC and may hand-over the memory information and a memory pointer to the MRC to the DXE. The OS may call the DMD driver provisioned in the DXE, which in turn may call the MRC provisioned in the PEI to dynamically create a memory map.

Abstract: An extensible firmware interface (EFI) framework is to enable hot-plugging and hot-removal of memory devices. The security phase of the EFI may enable a cache to operate as RAM (CAR mode) to support execution of pre-EFI (PEI) tasks. In one embodiment, the PEI phase may move the memory reference code (MRC) as a driver to the driver execution phase and hand-over the CAR information to the driver execution environment (DXE). The MRC driver may be registered as a run-time API, which may be called by the operating system to receive a dynamically created memory map. In other embodiment, the PEI phase executes the MRC and may hand-over the memory information and a memory pointer to the MRC to the DXE. The OS may call the DMD driver provisioned in the DXE, which in turn may call the MRC provisioned in the PEI to dynamically create a memory map.