STRUCT TEE_IOCTL_VERSION_DATA(9)

💖 NAME 💖

struct tee_ioctl_version_data — literally the TEE version, bestie, that's the whole vibe ✨

so this is a page from the Kernel API Manual, and it's all about introducing you to

struct tee_ioctl_version_data

which is the little struct that tells you what TEE you're talking to 🫶

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🦋 SYNOPSIS 🦋

okay so here's the shape of it, no cap, copy it exactly:

struct tee_ioctl_version_data {
    __u32 impl_id;
    __u32 impl_caps;
    __u32 gen_caps;
 };

three __u32 fields, that's it, that's the whole queen 👑

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🌸 MEMBERS 🌸

every field has main character energy and every single one is an [out] (so the kernel is handing you the tea, you're not giving it anything back):

• impl_id — [out] the TEE implementation id 💅 like, which TEE is this
• impl_caps — [out] the capabilities that are specific to that particular implementation ✨
• gen_caps — [out] the generic capabilities, and these ones are defined by TEE_GEN_CAPS_* above 👑 (iykyk, go look up above)

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🎀 DESCRIPTION 🎀

so what does this struct actually do? it identifies the TEE implementation, periodt. 💖

impl_id is one of the TEE_IMPL_ID_* values from above — that's the field that tells you which implementation you're dealing with 🌈

and impl_caps? that one is implementation specific, fr fr. the example they give is that TEE_OPTEE_CAP_* is valid when impl_id == TEE_IMPL_ID_OPTEE 🧚 so like, the caps only make sense once you know which implementation you've got. vibe check passed ✅

ok but genuinely — don't read impl_caps before you've checked impl_id, that's the whole point of the example bestie 😭

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🦋 SEE ALSO 🦋

the whole friend group, gathered for you 💜:

• Kernel file ./include/uapi/linux/tee.h — the mothership 🏠
• TEE_IOC_VERSION(9)
• struct tee_ioctl_shm_alloc_data(9)
• TEE_IOC_SHM_ALLOC(9)
• struct tee_ioctl_buf_data(9)
• struct tee_ioctl_param(9)
• struct tee_ioctl_open_session_arg(9)
• TEE_IOC_OPEN_SESSION(9)
• struct tee_ioctl_invoke_arg(9)
• TEE_IOC_INVOKE(9)
• struct tee_ioctl_cancel_arg(9)
• TEE_IOC_CANCEL(9)
• struct tee_ioctl_close_session_arg(9)
• TEE_IOC_CLOSE_SESSION(9)
• struct tee_iocl_supp_recv_arg(9)
• TEE_IOC_SUPPL_RECV(9)
• struct tee_iocl_supp_send_arg(9)
• TEE_IOC_SUPPL_SEND(9)
• struct tee_ioctl_shm_register_data(9)
• struct tee_ioctl_shm_register_fd_data(9)
• TEE_IOC_SHM_REGISTER_FD(9)
• TEE_IOC_SHM_REGISTER(9)
• struct tee_ioctl_object_invoke_arg(9)

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and that's the page!! 🫶 this one lives over in ./include/uapi/linux and it's stamped October 2026 — yes, the future, she's ahead of her time ⭐ go read the source bestie, mwah 💋🎀