STRUCT EP11_CPRB(9)

💖 struct ep11_cprb(9) 💖

Okay so bestie, welcome to the Kernel API Manual ✨ — this page is literally all about the EP11 connectivity programming request block. It’s giving “every byte has main character energy,” so let’s do a vibe check on each member. No skipping, fr fr. 💅

🌸 NAME 🌸

struct ep11_cprb — EP11 connectivity programming request block. That’s the whole mood. 💖

🦋 SYNOPSIS 🦋

struct ep11_cprb {
    __u16 cprb_len;
    __u8 cprb_ver_id;
    __u8 pad_000[2];
    __u8 flags;
    __u8 func_id[2];
    __u32 source_id;
    __u32 target_id;
    __u32 ret_code;
    __u32 reserved1;
    __u32 reserved2;
    __u32 payload_len;
 };

🎀 Members 🎀

• cprb_len — CPRB header length [0x0020]. Header length said what it said. 💫
• cprb_ver_id — CPRB version id. [0x04]. Iconic version behavior. 🦋
• pad_000 — Alignment pad bytes. Lowkey just here for the alignment vibe. ✨
• flags — Admin bit [0x80], Special bit [0x20]. Bit flags doing their little flag thing. 🚩
• func_id — Function id / subtype [0x5434] "T4". Yep, it’s literally giving “T4.” 💅
• source_id — Source id [originator id]. The originator’s whole identity. 🫶
• target_id — Target id [usage/ctrl domain id]. Target acquired, usage/ctrl domain style. 🎯
• ret_code — Return code. The moment of truth. 😭
• reserved1 — Reserved. Respectfully reserved. 🙈
• reserved2 — Reserved. Also reserved, also respectfully. 🙈
• payload_len — Payload length. Payload said “measure me.” 📏

🌈 SEE ALSO 🌈

• Kernel file ./arch/s390/include/uapi/asm/zcrypt.h — plus the struct squad: struct ica_rsa_modexpo(9), struct ica_rsa_modexpo_crt(9), struct ep11_target_dev(9), struct ep11_urb(9), struct zcrypt_device_status_ext(9) 👑

That’s the whole glow-up bestie 💅 — sourced from ./arch/s390/include/uapi/asm and dated October 2026. Byeee! 🫶✨