tpm_pcr_read(9)

💅 tpm_pcr_read(9) — Kernel API Manual ✨

okay so bestie, welcome to the tpm_pcr_read(9) page from the Kernel API Manual 🫶. We're reading a PCR value from the SHA1 bank, and honestly? iconic. 🧚

🎀 NAME

tpm_pcr_read — read a PCR value from SHA1 bank

🌸 SYNOPSIS

int tpm_pcr_read (struct tpm_chip *chip , u32 pcr_idx , struct
       tpm_digest *digest );

🦋 ARGUMENTS

• chip — a struct tpm_chip instance, NULL for the default chip. so if you're feeling default-core, pass NULL 💅
• pcr_idx — the PCR to be retrieved. that's the one, bestie 🎯
• digest — the PCR bank and the buffer the current PCR value is written to. it's giving "put the value here" energy 🍓

🔥 RETURN

same as with tpm_transmit_cmd. no cap, literally the same return situation as tpm_transmit_cmd 👑

👑 SEE ALSO

• Kernel file ./drivers/char/tpm/tpm-interface.c
• tpm_calc_ordinal_duration(9)
• tpm_transmit(9)
• tpm_transmit_cmd(9)
• tpm_is_tpm2(9)
• tpm_pcr_extend(9)
• tpm_get_random(9)

mwah 💋 — signing off from ./drivers/char/tpm, October 2026, on the tpm_pcr_read(9) page. periodt ✨🫶