pcc_parse_subspace_db_reg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pcc_parse_subspace_db_reg — Kernel API Manual, bestie edition ✨

okay so picture this: you're deep in the kernel, you found a PCC doorbell register, and now somebody's gotta parse it. That somebody is this function. It lives in the Kernel API Manual (that's the 9 in pcc_parse_subspace_db_reg(9), iykyk 👑), and honestly? It's giving "small function, big responsibilities."

🌸 NAME 🌸

pcc_parse_subspace_db_reg — the one that parses the PCC doorbell register 🎀

Like. That's the whole job. Parse the doorbell register. No cap.

✨ SYNOPSIS ✨

int pcc_parse_subspace_db_reg (struct pcc_chan_info *pchan , struct
acpi_subtable_header *pcct_entry );

it returns an int, it takes two pointers, and yes the argument list is spaced kinda weird in the original — I'm keeping it exactly as-is because we don't "fix" things in this house 💖

🦋 ARGUMENTS 🦋

  • pchan — pointer to the PCC channel info structure. your main character struct, fr fr. it's a struct pcc_chan_info * and it's where the channel lore lives 👑
  • pcct_entry — pointer to the ACPI subtable header. that's a struct acpi_subtable_header *, and it's the ACPI side of the story 🌈

two pointers, one function, zero drama. (okay maybe a little drama.)

⭐ RETURN ⭐

0 for Success, else errno. 💀

like — 0 means we ate and left no crumbs, anything else means it's errno o'clock and you gotta go read the error code. periodt.

🫶 SEE ALSO 🫶

the whole friend group 🧚, and also where all this actually lives:

Kernel file ./drivers/mailbox/pcc.c

and the extended cast, in the order the original lists them (don't come for me about alphabetical order, I'm being faithful 💅):

bestie if you're here you're probably also gonna need pcc_parse_subspace_irq and pcc_parse_subspace_shmem — they're the sibling parsers and they lowkey do the same vibe check on different registers 🔥

that's the whole page!! mwah 💋 source: ./drivers/mailbox · version: Kernel API Manual · date: October 2026 — stay hydrated, read your errnos, and slay bestie 🍓💜

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