efi_mem_reserve(9)

✨ NAME ✨

Okay bestie, welcome to efi_mem_reserve(9) from the Kernel API Manual 💖 — this one is literally all about reserving an EFI memory region. Iconic behavior, no cap.

🎀 SYNOPSIS 🎀

void efi_mem_reserve (phys_addr_t addr , u64 size );

🦋 ARGUMENTS 🦋

• addr — the physical address you wanna reserve, bestie.
• size — how big that reservation is. The vibes must be sized correctly, fr fr.

🌸 DESCRIPTION 🌸

So the way this works: it marks a region as reserved from general kernel allocation and prevents it from being released by efi_free_boot_services. Slay 💅 — that region is protected.

Drivers should call this function once they've parsed EFI configuration tables to figure out where their data lives — for example, efi_esrt_init. Like, do the parsing first, then reserve. Main character energy only ✨.

👑 SEE ALSO 👑

• Kernel file ./drivers/firmware/efi/efi.c
• reserve_unaccepted(9)

mwah 💋 — this page lives under ./drivers/firmware/efi and it’s dated October 2026 🫶