optee_ffa_do_call_with_arg(9)

📦 version 7.3.1, in nixpkgs unstable

✨ optee_ffa_do_call_with_arg ✨

okay bestie so we're in the Kernel API Manual today and the star of the show is optee_ffa_do_call_with_arg(9) — say that five times fast, i dare you 🫶

💖 NAME 💖

optee_ffa_do_call_with_arg — literally does a FF-A call to go enter OP-TEE in the secure world 💅

🦋 SYNOPSIS 🦋

int optee_ffa_do_call_with_arg (struct tee_context *ctx , struct tee_shm
*shm , u_int offs , bool system_thread );

🎀 ARGUMENTS 🎀

  • ctx — the calling context, aka who's knocking on the door 🚪
  • shm — the shared memory that's holding the message you wanna pass to secure world, it's giving little messenger bag 👜
  • offs — offset of the message inside shm, so like where in the bag the note actually is
  • system_thread — true if the caller is requesting TEE system thread support, no cap, that's the whole vibe check on this one

🌸 DESCRIPTION 🌸

So it does a FF-A call to OP-TEE over in secure world, and it also handles any eventual resulting Remote Procedure Calls (RPC) that OP-TEE sends back at you. very main character, handles its own drama 😭

Returns the return code from FF-A — 0 is OK, everything's slaying 🔥

🌈 SEE ALSO 🌈

Kernel file ./drivers/tee/optee/ffa_abi.c, plus the whole friend group:

okay that's the whole page bestie, go forth and make your FF-A calls 💜

signed, sealed, delivered from ./drivers/tee/optee, dated October 2026, and brought to you by the one and only optee_ffa_do_call_with_arg(9) — mwah 🧚💖

📦 where this page comes from