tpm1_get_random(9)

🌸 NAME 🌸

Okay bestie, gather ’round: this is tpm1_get_random, straight out of the Kernel API Manual — section (9) energy ✨. It’s literally the function that gets random bytes from the TPM's RNG. No cap, that’s the whole name vibe. 🎀

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✨ SYNOPSIS ✨

int tpm1_get_random (struct tpm_chip *chip , u8 *dest , size_t max );

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🎀 ARGUMENTS 🎀

Here’s the cast — three little parameters doing main character work:

• chip — a struct tpm_chip instance. That’s the TPM chip bestie in question. 💖
• dest — destination buffer for the random bytes. This is where the random goodness lands. ✨
• max — the maximum number of bytes to write to dest. Respect the limit, periodt. 💅

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💅 RETURN 💅

The return value is giving two possible moods:

• number of bytes read 🌈
• -errno (positive TPM return codes are masked to -EIO) 😭

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🦋 SEE ALSO 🦋

The Kernel file is ./drivers/char/tpm/tpm1-cmd.c, and these are the linked besties you should also check out:

• tpm1_calc_ordinal_duration(9)
• tpm1_startup(9)
• tpm1_continue_selftest(9)
• tpm1_do_selftest(9)
• tpm1_auto_startup(9)
• tpm1_pm_suspend(9)
• tpm1_get_pcr_allocation(9)

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Cute sign-off time 💖: this page comes from the source path ./drivers/char/tpm, dated October 2026 — stay random, bestie, and hydrate! 🦋💅✨