STRUCT TCW(9)

💅 struct tcw(9) — Transport Control Word (TCW) 💅

hii bestie!! welcome to the Kernel API Manual, where we're decoding struct tcw(9) — literally the Transport Control Word (TCW) 💖 no cap, this page is short and iconic.

💖 NAME 💖

struct tcw — Transport Control Word (TCW) 💖 that's the name, that's the whole assignment, and it ate.

🦋 SYNOPSIS 🦋

okay so here's the whole struct, exactly as it appears — every field, every bitfield colon, every little anonymous slot, untouched and slaying:

struct tcw {
    u32 format:2;
    u32 :6;
    u32 flags:24;
    u32 :8;
    u32 tccbl:6;
    u32 r:1;
    u32 w:1;
    u32 :16;
    dma64_t output;
    dma64_t input;
    dma64_t tsb;
    dma64_t tccb;
    u32 output_count;
    u32 input_count;
    u32 :32;
    u32 :32;
    u32 :32;
    dma32_t intrg;
};

🎀 Members 🎀

here's the cast, bestie — every member gets its moment ✨

• format — TCW format 💫
• flags — TCW flags 🚩
• tccbl — Transport-Command-Control-Block Length 📏
• r — Read Operations 📖
• w — Write Operations ✍️
• output — Output-Data Address 📤
• input — Input-Data Address 📥
• tsb — Transport-Status-Block Address 🧾
• tccb — Transport-Command-Control-Block Address 🎯
• output_count — Output Count 🔢
• input_count — Input Count 🔢
• intrg — Interrogate TCW Address ❓

🌈 SEE ALSO 🌈

go check out these beauties, fr fr 🫶

• Kernel file ./arch/s390/include/asm/fcx.h
• struct tidaw(9)
• struct tsa_iostat(9)
• struct tsa_intrg(9)
• struct tsb(9)
• struct dcw_intrg_data(9)
• struct dcw(9)
• struct tccb_tcah(9)
• struct tccb_tcat(9)
• struct tccb(9)

mwah 💋 and that's a wrap! The source/version footer is ./arch/s390/include/asm, the date is October 2026, and the page title is struct tcw(9) — bye bestie, go slay 💅✨