unpack_scmi_header(9)

💅 unpack_scmi_header(9) — the Kernel API Manual page, bestie edition 🎀

Okay so hi, you're looking at unpack_scmi_header, which lives in the Kernel API Manual, and honestly? It's giving tiny-but-mighty. It unpacks and records the message id and the protocol id. That's the whole vibe. Small function, big slay. ✨

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🌸 NAME 🌸

unpack_scmi_header — unpacks and records message and protocol id 💖

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✨ SYNOPSIS ✨

void unpack_scmi_header (u32 msg_hdr , struct scmi_msg_hdr *hdr );

Literally that's it. Two args, no return value (void, she doesn't give anything back, she just does the thing 👑).

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🦋 ARGUMENTS 🦋

• msg_hdr — the 32-bit packed message header that got sent from the platform. Think of it as the cute little compressed package 📦 and this function is the one opening it.
• hdr — pointer to the header where the message id and protocol id get fetched into. Basically the drop-off spot. 🫶

Ngl, that's the entire argument list. Two things. No defaults, no optional extras. Minimalism ate. 💅

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🔥 SEE ALSO 🔥

Grab a snack, because this list is long — but every single one of these is a real reference, so we're listing them all, no cap:

• Kernel file ./drivers/firmware/arm_scmi/common.h
• pack_scmi_header(9) — the other half of this duo, the packing one 🌈
• struct scmi_chan_info(9)
• struct scmi_transport_ops(9)
• struct scmi_desc(9)
• struct scmi_debug_info(9)
• struct scmi_shmem_io_ops(9)
• struct scmi_shared_mem_operations(9)
• struct scmi_message_operations(9)
• struct scmi_transport_core_operations(9)
• struct scmi_transport_handle(9)
• struct scmi_transport(9)
• struct scmi_transport_supplier(9)
• scmi_transport_supplier_put(9)
• scmi_transport_supplier_get(9)

It's giving whole friend group, honestly. Go read them, iykyk. 🧚

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So that's the page!! This one came out of ./drivers/firmware/arm_scmi, dated October 2026, and the whole thing is filed under unpack_scmi_header(9). Stan a tidy little manpage. ⭐💜