ppc_rtas_rmo_buf_show(9)

💅 ppc_rtas_rmo_buf_show(9) 💅

okay so bestie, you're in the Kernel API Manual and we're about to talk about ppc_rtas_rmo_buf_show, which lowkey has the most iconic job: telling user space where its little RTAS playground lives. slay.

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✨ NAME ✨

ppc_rtas_rmo_buf_show — Describe RTAS-addressable region for user space. 🫶

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🎀 SYNOPSIS 🎀

int ppc_rtas_rmo_buf_show (struct seq_file *m , void *v );

literally the whole signature, no cap.

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🌸 ARGUMENTS 🌸

• m — seq_file output target. this is the main character, it's where the output goes 💖
• v — Unused. not invited to the party, bestie. ignore her 🙈

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🦋 DESCRIPTION 🦋

so basically this gives you the base + size description of a range of RTAS-addressable memory — a region that's been set aside so user space can use it as work area(s) for certain RTAS functions. yes, that's a real sentence, and yes, it ate. ✨

user space gets at this region via /dev/mem. iykyk.

now the serious part, and i need you to listen: apart from security policies, the kernel does not arbitrate or serialize access to this region. none. zero. the kernel is not your mom, it's not holding the door, it's not breaking up fights. 💀

so user space must ensure that concurrent users do not interfere with each other. that's on you, bestie. multiple processes in here at once with no referee is giving chaos energy and it will absolutely not slay if you get it wrong. 😭

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👑 SEE ALSO 👑

Kernel file ./arch/powerpc/kernel/rtas-proc.c — go read it, that's where the lore lives 📖

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and that's the vibe check, bestie! this page came from ./arch/powerpc/kernel, dated October 2026, and it's filed under ppc_rtas_rmo_buf_show(9). periodt. 💜🌈⭐