GRUB4EFI: addresses to get free memory?

[deomsh]

With GRUB4DOS I can use following addresses to get free memory: *0x8298/ *0x82C0 (memory below/ above 4GB)

These addresses are not working (for me) with GRUB4EFI.

Are there other (fixed) memory addresses can use in case of GRUB4EFI? I need these addresses in a script.