cpacf_klmd(9)

💅 cpacf_klmd — Kernel API Manual, but make it cute

okay so bestie, welcome to the cpacf_klmd(9) page 💖 this is a kernel API manual page, and it's all about one very specific vibe: the KLMD instruction. let's get into it ✨

---

🌸 NAME 🌸

cpacf_klmd — executes the KLMD (COMPUTE LAST MESSAGE DIGEST) instruction 👑

like, that's literally the whole plot. no cap.

---

✨ SYNOPSIS ✨

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

that's the whole signature, copy it exactly, don't get creative with it 🎀

---

🦋 ARGUMENTS 🦋

• func — the function code passed to KM; see the CPACF_KLMD_xxx defines for the actual codes. iykyk 👀
• param — address of parameter block; see POP for details on each func 🫶 (yes, you gotta read POP, no skipping)
• src — address of source memory area 🌈
• src_len — length of src operand in bytes, fr fr, it's measured in bytes 💀

---

🔥 SEE ALSO 🔥

Kernel file ./arch/s390/include/asm/cpacf.h, plus the whole friend group:

• cpacf_query(9)
• cpacf_qai(9)
• cpacf_km(9)
• cpacf_kmc(9)
• cpacf_kimd(9)
• _cpacf_kmac(9)
• cpacf_kmac(9)
• cpacf_kmctr(9)
• cpacf_prno(9)
• cpacf_trng(9)
• cpacf_pcc(9)
• cpacf_pckmo(9)
• cpacf_kma(9)

like, the whole squad's here 🫶✨ main character energy from cpacf_klmd honestly 💜

---

ngl, if you're calling this, you're probably deep in s390 crypto-land, and that's iconic of you 🧚 💅

---

and that's the page!! sourced straight from ./arch/s390/include/asm, dated October 2026, cpacf_klmd(9) — slay, bye bestie 🎀💖🌸