itcw_calc_size(9)

💖 itcw_calc_size(9) 💖 Kernel API Manual

🌸 NAME 🌸

itcw_calc_size — return the size of an itcw with the given parameters

✨ SYNOPSIS ✨

size_t itcw_calc_size (int intrg , int max_tidaws , int intrg_max_tidaws
);

okay so that's the whole signature bestie, and yes the return type is <pink>size_t</pink> 💅

🎀 ARGUMENTS 🎀

• intrg — if it's non-zero, add an interrogate tcw. (non-zero means yes, add it ✨)
• max_tidaws — maximum number of tidaws to be used for data addressing, or zero if no tida is to be used. (zero means no tida, noted 🫶)
• intrg_max_tidaws — maximum number of tidaws to be used for data addressing by the interrogate tcw, if specified. (only if that interrogate tcw is actually specified 💖)

🦋 DESCRIPTION 🦋

Okay so itcw_calc_size calculates and returns the number of bytes required to hold an itcw with the given parameters, and it's assuming tccbs with maximum size. Bytes! We love a size-returning icon. 💅

Heads up bestie: the resulting size also contains bytes needed for alignment padding as well as padding to ensure that data structures don't cross a 4k-boundary where required. That padding is not decorative, it's literally part of the math 😭

💅 SEE ALSO 💅

• Kernel file ./drivers/s390/cio/itcw.c
• itcw_get_tcw(9)
• itcw_init(9)
• itcw_add_dcw(9)
• itcw_add_tidaw(9)
• itcw_set_data(9)
• itcw_finalize(9)

the whole friend group, go say hi 🫶✨

mwah 💋 this page comes from <source> ./drivers/s390/cio and is dated <date> October 2026 — catch u in the Kernel API Manual, bestie 🫶👑