cpacf_kimd(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cpacf_kimd — kernel API manual, but make it a vibe

okay so bestie, welcome to cpacf_kimd(9) — the kernel API manual page for the function that executes the KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) instruction ✨ that's literally the whole NAME section, no notes, she's efficient, we love that for her 🌸

✨ SYNOPSIS ✨

like, here's the whole signature, copy it exactly bestie, don't freestyle:

void cpacf_kimd (unsigned long func , void *param , const u8 *src , long
src_len );

yes the spacing is a little chaotic, no we're not fixing it, she's iconic like that 💅

🎀 ARGUMENTS 🎀

  • func — the function code that gets passed to KM, periodt. the CPACF_KIMD_xxx defines are your besties here, go look at them 👑
  • param — the address of the parameter block. and like, each func has its own opinion about what goes in there, so check the POP for the deets on every single func 🦋
  • src — the address of the source memory area, aka where your data is actually living 🍓
  • src_len — the length of the src operand, in bytes. count them. respectfully. 📏

🌈 SEE ALSO 🌈

run, don't walk, to the kernel file ./arch/s390/include/asm/cpacf.h — she's the main character, the rest of these are her extended universe 🫶

note the tiny detail besties: _cpacf_kmac(9) has a little underscore bestie in front of it and cpacf_kmac(9) doesn't — they're different pages, do not mix them up, iykyk 🔥

okay that's the whole page, and honestly? ate. 💖

cute little sign-off moment: this one's stamped October 2026, it lives in ./arch/s390/include/asm, and the page is literally named cpacf_kimd(9) — so if you forget any of that, it's right there in the footer, slay ✨🦋🎀

📦 where this page comes from