Symbol: EFI_USEC_PER_SEC
drivers/firmware/efi/libstub/gop.c
318
status = efi_wait_for_key(10 * EFI_USEC_PER_SEC, &key);
drivers/firmware/efi/libstub/gop.c
321
efi_bs_call(stall, 10 * EFI_USEC_PER_SEC);