map_iommu(9)

💖 map_iommu(9) 💖

okay so bestie, welcome to the map_iommu page — it lives in section 9 of the kernel API manual, and it's honestly kind of a baddie. let's get into it ✨

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🌸 NAME 🌸

map_iommu — literally just maps the iommu's registers. that's the whole vibe. no cap. 🎀

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🦋 SYNOPSIS 🦋

int map_iommu (struct intel_iommu *iommu , struct dmar_drhd_unit *drhd
);

it returns an int, and you hand it two things. iconic signature tbh 💅

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✨ ARGUMENTS ✨

• iommu — the iommu you wanna map. that's it, that's the one. 🫶
• drhd — the DMA remapping hardware definition structure. yes the whole name. say it with your chest. 🔥

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💜 DESCRIPTION 💜

so what it does is memory map the iommu's registers. periodt.

it starts with a single page — just one, lowkey humble of it — and possibly expands if that turns out to be insufficent. so like, the single page might not eat, and then it grows. we love a flexible queen 🌈

ngl, "possibly expand" is doing a lot of heavy lifting in that sentence, but that's exactly what the page says, so that's what you get 💀

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🍓 SEE ALSO 🍓

• Kernel file ./drivers/iommu/intel/dmar.c
• dmar_table_detect(9)
• parse_dmar_table(9)

go read those if you want the full lore, iykyk 👑

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🧚 sign-off 🧚

that's the whole page, bestie — source is ./drivers/iommu/intel, dated October 2026, and it's still out here answering to map_iommu(9). slay 💖✨🎀