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An EFI boot option (stored in a BootXXXX variable) comprises an EFI_LOAD_OPTION structure, which includes some undefined number of EFI device paths. (The structure is extremely messy and awkward to parse in C, but that's par for the course with EFI.) Add a function to extract the first device path from an EFI load option, along with wrapper functions to read and extract the first device path from an EFI boot variable. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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