tm_cvsx_set(9)

📦 version 7.3.1, in nixpkgs unstable

hey bestie! welcome to tm_cvsx_set(9), straight from the Kernel API Manual 💖 this one’s all about registers and transactions, and yes, we’re gonna keep every single detail.

✨ NAME ✨

tm_cvsx_set — set CFPR registers 🎀

🦋 SYNOPSIS 🦋

okay so the signature is literally this, no cap:

int tm_cvsx_set (struct task_struct *target , const struct user_regset
*regset , unsigned int pos , unsigned int count , const void *kbuf ,
const void __user *ubuf );

💅 ARGUMENTS 💅

here’s the cast, bestie:

  • target — The target task. 🎯
  • regset — The user regset structure. 🧚
  • pos — The buffer position. 📍
  • count — Number of bytes to copy. 🔢
  • kbuf — Kernel buffer to copy into. 🫶
  • ubuf — User buffer to copy from. 🌸

🔥 DESCRIPTION 🔥

okay so what this function does: it sets in transaction checkpointed VSX registers ✨

when the transaction is active, 'ckfp_state' holds the checkpointed VSX register values for the current transaction to fall back on if it aborts in between. and yeah, this function sets these checkpointed FPR registers, periodt. 💅

the userspace interface buffer layout is literally this:

struct data { u64     vsx[32]; };

🌈 SEE ALSO 🌈

the kernel file is ./arch/powerpc/kernel/ptrace/ptrace-tm.c, and the whole squad is:

mwah 💋 this lil fave lives in ./arch/powerpc/kernel/ptrace, stamped October 2026, and it’s literally tm_cvsx_set(9) — bye bestie 🫶

📦 where this page comes from