mmap_action_simple_ioremap(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mmap_action_simple_ioremap — from the Kernel API Manual, bestie

okay so picture this: you're hanging out in the kernel API manual, just vibing, and a page called mmap_action_simple_ioremap(9) shows up. that's our girl. she's a helper. she does one thing and she does it iconically. ✨

🌸 NAME 🌸

mmap_action_simple_ioremap — she's the helper for the mmap_prepare hook, and her whole job is to say "hey, this physical range right here, the one in [start_phys_addr, start_phys_addr + size), should get I/O remapped." that's it. that's the whole vibe. no cap. 💖

🎀 SYNOPSIS 🎀

void mmap_action_simple_ioremap (struct vm_area_desc *desc , phys_addr_t
start_phys_addr , unsigned long size );

look at her. void return, three arguments, zero drama. slay. 🔥

🦋 ARGUMENTS 🦋

okay bestie, here's what you're feeding her:

  • desc — the VMA descriptor for the VMA that's asking for the remap. she knows exactly which one, she's not confused, she's not guessing. 👑
  • start_phys_addr — where the physical memory you want mapped actually starts. the beginning. the origin story. ⭐
  • size — how big the area to map is. the range is [start_phys_addr, start_phys_addr + size), so like, mind the bracket, she's watching. 🎀

⚠️ NOTE ⚠️

some drivers out there might want to tweak desc->page_prot for write-combine purposes or something similar. that's valid. that's their moment. do your thing, driver. 💅

🌈 SEE ALSO 🌈

she runs with a whole crowd, and honestly? the friend group is giving main character energy. the kernel file is ./include/linux/mm.h, and here's everybody else:

like, fifty-plus besties. she's connected. iykyk. 🫶

and that's the page, bestie 💜 this one lives over in ./include/linux and the version floating around out there is dated October 2026 — go off, mmap_action_simple_ioremap(9), you ate. 👑✨🌸

📦 where this page comes from