STRUCT OPTEE_MSG_PARAM_TMEM(9)

👑 struct optee_msg_param_tmem — the temporary memory reference parameter, bestie

Okay so this is a page from the Kernel API Manual, and it's literally just here to introduce you to one little struct: struct optee_msg_param_tmem. She's the temporary memory ref param and she's iconic ✨

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🌸 NAME 🌸

struct optee_msg_param_tmem — temporary memory reference parameter 💖

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🎀 SYNOPSIS 🎀

struct optee_msg_param_tmem {
    u64 buf_ptr;
    u64 size;
    u64 shm_ref;
 };

That's the whole glow-up. Three u64s and a dream 🦋

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✨ Members ✨

• buf_ptr — the address of the buffer. Like, where the actual buffer lives 📍
• size — the size of the buffer. The how-much, basically 📏
• shm_ref — temporary shared memory reference, and it's a pointer to a struct tee_shm. Yep, pointer-inception, we love to see it 🔗

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💅 Description 💅

So here's the tea, bestie: the secure world and the normal world pass pointers around as physical addresses, not virtual addresses. Why? Because these two worlds have completely independent memory mapping — like two separate group chats that don't share a single message. No cap 😭

And it gets more real — the normal world can even have a hypervisor sitting in the middle. The hypervisor needs to translate the guest physical address (AKA IPA in ARM documentation, iykyk) into a real physical address before it passes the structure over to the secure world. So yeah, there's a whole translation era going on before anything reaches the other side 🔥

It's giving "addresses are physical on purpose" and honestly the way this design just works? Obsessed 🫶

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🌈 SEE ALSO 🌈

Kernel file ./drivers/tee/optee/optee_msg.h struct optee_msg_param_rmem(9), struct optee_msg_param_fmem(9), struct optee_msg_param_value(9), struct optee_msg_param(9), struct optee_msg_arg(9), OPTEE_MSG_GET_ARG_SIZE(9) — go read the whole friend group, they all slay together ⭐

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And that's the page! 🎉 Sourced from ./drivers/tee/optee, dated October 2026, and titled struct optee_msg_param_tmem(9) — mwah, go forth and reference your temporary memory correctly, bestie 💜🧚