efi-rpm-macros provides a set of RPM macros for use in EFI-related packages.

The following variables are meaningful on the make command line:

EFI_ESP_ROOT the directory where the EFI System Partition is mounted
EFI_ARCHES the rpm arches %efi will match on
EFI_VENDOR the vendor name for your EFI System Partition directory

The following rpm macros are set:

%efi the arches that EFI packages should be built on, suitable for use with %ifarch
%efi_vendor the vendor name for your EFI System Partition directory
%efi_esp_root the directory where the EFI system Partition is mounted
%efi_esp_efi the full path to \EFI on the EFI System Partition
%efi_esp_boot the full path to \EFI\BOOT on the EFI System Partition
%efi_esp_dir the full path to your vendor directory on the EFI System Partition
%efi_arch the EFI architecture name, e.g. x64
%efi_arch_upper the EFI architecture name in upper case, e.g. X64

https://github.com/rhboot/efi-rpm-macros