efi_memmap_alloc(9)

✨ efi_memmap_alloc(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 this one's all about efi_memmap_alloc — the little function that gets your EFI memory map its very own memory. iconic behavior, honestly.

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🌸 NAME 🌸

efi_memmap_alloc — Allocate memory for the EFI memory map

like literally, it's the allocator for the EFI memory map. that's the whole vibe. 🫶

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🎀 SYNOPSIS 🎀

int efi_memmap_alloc (unsigned int num_entries , struct efi_memory_map_data *data );

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🦋 ARGUMENTS 🦋

• num_entries — Number of entries in the allocated map. yes bestie, it's literally how many entries your allocated map is gonna have. count 'em. 🔥
• data — efi memmap installation parameters. the whole setup-info situation for installing that memmap. 💖

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👑 DESCRIPTION 👑

Depending on whether mm_init has already been invoked or not, either memblock or "normal" page allocation is used. so yeah — the function checks if mm_init has run yet, and picks its allocation strategy accordingly. lowkey adaptive. 🧚

Returns zero on success, a negative error code on failure. no cap: 0 means slay, negative means something went wrong. 😭

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🌈 SEE ALSO 🌈

Kernel file ./arch/x86/platform/efi/memmap.c, plus the whole friend group: efi_memmap_install(9), efi_memmap_split_count(9), efi_memmap_insert(9). go read them, iykyk 💜

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and that's the page, bestie! brought to you by the ./arch/x86/platform/efi source, version vibes, dated October 2026 — periodt. 🎀✨💅