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Check Available Text and Graphic Modes From UEFI Shell

Some time ago a reader of this blog contacted me for assistance with enumerating possible screen modes from the UEFI shell. This post is in response to that request for help. The original EFI (Extensible Firmware Interface) specification and EDK (EFI Development Kit) supported a text output protocol and UGA (Universal Graphic Adapter), a device-independent VGA-derived graphics protocol. In 2005, Intel handed EFI standardization over to an industry consortium, UEFI, and that consortium decided to replace UGA with GOP (Graphics Output Protocol) to remove the remaining VGA hardware dependencies. The following code should work with any of the UDK (UEFI