pdc_stable_write(9)

📦 version 7.3.1, in nixpkgs unstable

💾 pdc_stable_write(9) — the pdc_stable_write page, bestie edition 🎀

okay so real talk: this is a page from the Kernel API Manual, and it's about pdc_stable_write — like, the function. it's a whole vibe, we're writing bytes into Stable Storage, let's get into it ✨

✨ NAME ✨

pdc_stable_write — Write data to Stable Storage. that's it, that's the whole thing, and honestly? iconic. 💅

🌸 SYNOPSIS 🌸

int pdc_stable_write (unsigned long staddr , void *memaddr , unsigned long count );

three args, returns an int, we love a clean signature 🫶

🦋 ARGUMENTS 🦋

  • staddr — the Stable Storage address you're accessing. this is the destination, the moment, the main character 💫
  • memaddr — the memory address where the Stable Storage data shall be read from. like, yes, bestie, it's called write but this is the address we're pulling the bytes out of — that's just how the call works, iykyk 🙈
  • count — number of bytes to transfer. and listen, count is multiple of 4. not "usually", not "preferably" — multiple of 4. periodt. 🔥

👑 DESCRIPTION 👑

okay so here's the tea ☕ — this PDC call reads count bytes from the supplied memaddr address, and copies count bytes to the Stable Storage address staddr.

yes, both things: reads count, copies count. that's the whole flow, no cap. 🧚

and the guardrail 👇

the call will fail if staddr+count > PDC_STABLE size. so if your range runs past the end of Stable Storage, it's giving error, not giving data. 💀

💜 SEE ALSO 💜

buckle up bestie, this list is LONG and it ate 🍓

Kernel file ./arch/parisc/kernel/firmware.c

like I said. a LOT. go read some of them, they're all valid, slay 🌈

and that's the page!! 🦋 this one lives in ./arch/parisc/kernel and the version/date stamp is October 2026 — so, yeah, mark your calendar, mwah 💖✨💅

📦 where this page comes from