STRUCT TIDAW(9)

💖 struct tidaw(9) — like, the Kernel API Manual, but make it make sense 💖

okay so bestie, we're in struct tidaw(9) territory and honestly? this one's a little cutie. it's the Transport-Indirect-Addressing Word, aka TIDAW — yes the acronym is a mouthful, no we are not shortening it, it's iconic as is. 🎀

this page lives in the kernel API manual, and it's gonna walk you through a lil struct with exactly three things in it. three! we love a low-maintenance icon. ✨

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🌸 NAME 🌸

struct tidaw — the Transport-Indirect-Addressing Word, or TIDAW if you're on a first-name basis (you are now). 💅

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🦋 SYNOPSIS 🦋

here's the whole vibe, no cap:

struct tidaw {
    u32 flags:8;
    u32 :24;
    u32 count;
    dma64_t addr;
 };

look at it. gorgeous. flags:8 is doing a little bit-packed moment, then there's a 24-bit anonymous gap just chilling there (u32 :24; — yes, it's unnamed, it's mysterious, it's giving main character energy with no name 🙈), then count, then addr. slay. 🔥

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👑 Members 👑

three members, each one pulling its weight. obsessed.

• flags — the TIDAW flags, bestie. this one can be an arithmetic OR of the following constants, so you can stack 'em up: TIDAW_FLAGS_LAST, TIDAW_FLAGS_SKIP, TIDAW_FLAGS_DATA_INT, TIDAW_FLAGS_TTIC, TIDAW_FLAGS_INSERT_CBC. that's the whole list, we're not hiding any. 🌈
• count — the count. literally that's it. it's the count. 💀
• addr — the address. also just… the address. sometimes the manual is like that and we respect it. 🫶

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🎀 SEE ALSO 🎀

go read these next, fr fr — they're all hanging out in the kernel file ./arch/s390/include/asm/fcx.h:

• struct tcw(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)

that's the whole squad. go say hi. 👋

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okay that's the page!! mwah 💋 this one came from ./arch/s390/include/asm and it's dated October 2026, and yes, it's still struct tidaw(9) at the end because some things simply don't change. periodt. 💜🌸✨