optee_from_msg_param(9)

🌸 optee_from_msg_param — a Kernel API Manual moment (section 9, bestie) 🌸

Okay so picture this: we're deep in the kernel, section 9, and the star of the show is optee_from_msg_param. It's a real one, from the Kernel API Manual, and it's literally the glow-up translator between two different representations of parameters. Let me tell you everything 💅

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✨ NAME ✨

optee_from_msg_param — the function that does the convert-up: it takes your OPTEE_MSG parameters and turns them into a struct tee_param. It's giving translator era, and honestly? Iconic 🦋

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✨ SYNOPSIS ✨

int optee_from_msg_param (struct optee *optee , struct tee_param *params
, size_t num_params , const struct optee_msg_param *msg_params );

Look at that signature. Four arguments, one int return, zero chill. Slay 🔥

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✨ ARGUMENTS ✨

• optee — the main service struct. The whole operation's main character, no cap 👑
• params — the subsystem's internal parameter representation. This is where the converted goodies land, iykyk 🎀
• num_params — how many elements are chillin' in the parameter arrays. Gotta count them, bestie 🧮
• msg_params — the OPTEE_MSG parameters. Also, plot twist, this is the line where the docs tell you the return story: Returns 0 on success or <0 on failure ⭐

Not me reminding you to actually check that return value. 0 means we ate, <0 means we did not eat. 💀

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✨ SEE ALSO ✨

Bestie, the friend group is huge and I love them all 🫶

• Kernel file ./drivers/tee/optee/smc_abi.c — yes, that's the actual file, keep it exactly like that 🔥
• optee_to_msg_param(9) — the reverse direction, the other half of the duo 💜
• optee_enable_shm_cache(9)
• __optee_disable_shm_cache(9)
• optee_disable_shm_cache(9)
• optee_disable_unmapped_shm_cache(9)
• optee_fill_pages_list(9)
• optee_shm_pool_alloc_pages(9)
• optee_handle_rpc(9)
• optee_smc_do_call_with_arg(9)

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🌈 And that's the page, periodt. ✨

Brought to you by the ./drivers/tee/optee source situation, the October 2026 edition, and the optee_from_msg_param(9) manual page itself — mwah, love u, go convert some params 💖🎀🧚