sba_alloc_range(9)

📦 version 7.3.1, in nixpkgs unstable

✨ sba_alloc_range(9) ✨

ok so bestie, welcome to the Kernel API Manual — this one's sba_alloc_range(9) and it's genuinely such a mood 💅

🌸 NAME 🌸

sba_alloc_range — find free bits and mark them in the IO PDIR resource bitmap 🎀

like, it literally goes shopping for empty bits and then claims them. iconic behaviour tbh.

🦋 SYNOPSIS 🦋

int sba_alloc_range (struct ioc *ioc , struct device *dev , size_t size );

that's the whole vibe. three args, returns an int. no cap.

💖 ARGUMENTS 💖

  • ioc — the IO MMU structure that owns the pdir we're interested in 👑 like, this is the main character, the one holding the resource bitmap we're about to rummage through.
  • dev — the device for which pages should be alloced 🫶 this is who the pages are for, bestie. we're doing this for them.
  • size — number of bytes to create a mapping for 📏 so like, how big a chunk are we talking. that's the ask.

🔥 DESCRIPTION 🔥

okay so here's the whole plot: given a size, it finds consecutive unmarked bits — like a little row of empty seats all next to each other, fr fr — and then marks those bits in the resource bit map 🎯

that's it. that's the function. find the gap, claim the gap. periodt. 💀

🌈 SEE ALSO 🌈

lowkey there's a whole friend group here, iykyk:

Kernel file ./drivers/parisc/sba_iommu.c plus the entire squad:

ok bye bestie, go read those too 🧚💜

— 🍓 this page came from ./drivers/parisc, dated October 2026, and it's filed under sba_alloc_range(9). slay ✨👑

📦 where this page comes from