tpm2_calc_ordinal_duration(9)

✨ tpm2_calc_ordinal_duration(9) ✨

okay so bestie, welcome to the Kernel API Manual — today's main character is tpm2_calc_ordinal_duration(9) and honestly? she's giving quiet-utility-icon energy. let's get into it 💅

---

🌸 NAME 🌸

tpm2_calc_ordinal_duration — literally just calculates the maximum command duration. that's it. that's the vibe. 🎀

---

🦋 SYNOPSIS 🦋

unsigned long tpm2_calc_ordinal_duration (u32 ordinal );

no cap, that's the whole signature. unsigned long in, one u32 argument, and we're off ✨

---

💖 ARGUMENTS 💖

• ordinal — the TPM command ordinal. iykyk, it's the little number that tells the chip which command we're talking about 🫶

---

🔥 DESCRIPTION 🔥

so what does she actually do? she returns the maximum amount of time the chip is expected by the kernel to take, measured in jiffies. that's it, that's the whole tea ☕ — a duration estimate, kernel-style.

bestie note: it's expected by kernel — so this is the kernel's assumption about the chip's worst-case timing, not some live measurement. don't go treating it like a stopwatch, fr fr 🕰️

---

🧚 SEE ALSO 🧚

the kernel file ./drivers/char/tpm/tpm2-cmd.c is where this lives, and here's her whole friend group — go say hi 👋

• tpm2_pcr_read(9)
• tpm2_pcr_extend(9)
• tpm2_get_random(9)
• tpm2_flush_context(9)
• tpm2_get_tpm_pt(9)
• tpm2_shutdown(9)
• tpm2_do_selftest(9)
• tpm2_probe(9)
• tpm2_startup(9)
• tpm2_auto_startup(9)

---

and that's the whole page, bestie 💜 this one's served up from ./drivers/char/tpm, dated October 2026 — tpm2_calc_ordinal_duration(9), signed, sealed, slayed. 🎀✨