ocxl_global_mmio_write32(9)

📦 version 7.3.1, in nixpkgs unstable

💖 ocxl_global_mmio_write32 — or, how to yeet a 32-bit value into global MMIO 💖

okay so this is a page from the Kernel API Manual, bestie, and it's about writing a 32 bit value to global MMIO. that's it. that's the whole vibe. let's get into it ✨

🌸 SYNOPSIS 🌸

int ocxl_global_mmio_write32 (struct ocxl_afu *afu , size_t offset ,
       enum ocxl_endian endian , u32 val );

like, four args, returns an int. nothing scary. you got this 🫶

🎀 ARGUMENTS 🎀

  • afu — The AFU. yes queen, the AFU itself, that's who we're talking to 💅
  • offset — The Offset from the start of MMIO. so it's how far in you're writing, measured from the very beginning of MMIO. count it out, no cap 📏
  • endian — the endianness that the MMIO data is in. gotta know which way the bytes are facing or it's giving chaos 🙈
  • val — The value to write. the actual 32-bit payload, the main character of this whole operation 👑

🦋 DESCRIPTION 🦋

so what does it do? it writes a 32 bit value to global MMIO. and what does it return? lowkey simple:

Returns 0 for success, negative on error. that's the whole tea. zero means slay, negative means something went sideways 😭

ngl, that's genuinely the entire description. sometimes the docs are short and iconic and that's fine 💜

⭐ SEE ALSO ⭐

Kernel file ./include/misc/ocxl.h — go read it, iykyk 📖

and the whole friend group, fr fr:

like, read32 and write64 and set and clear are all literally right there in the list — it's a whole family and they all ate 🔥

and that's the page!! 🧚 from ./include/misc, dated October 2026, and it's ocxl_global_mmio_write32(9) — go write your 32 bits, bestie, you're gonna do amazing 💖🎀✨

📦 where this page comes from