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tpm-buf: Add TPM buffer support header for standalone reuse

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Extract all the functions and definitions for TPM buffer handling
and separate them into their own header.

Signed-off-by: Ross Philipson <ross.philipson@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Ross Philipson 2026-07-11 09:01:10 -07:00 committed by Jarkko Sakkinen
parent 3d9e043dab
commit 55ba91d4c5
3 changed files with 63 additions and 34 deletions
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3
drivers/char/tpm/tpm-buf.c
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@ -4,7 +4,8 @@
*/
#include <linux/module.h>
#include <linux/tpm.h>
#include <linux/tpm_command.h>
#include <linux/tpm_buf.h>
static void __tpm_buf_size_invariant(struct tpm_buf *buf, u16 buf_size)
{

34
include/linux/tpm.h
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@ -26,6 +26,7 @@
#include <crypto/aes.h>
#include <linux/tpm_command.h>
#include <linux/tpm_buf.h>
struct tpm_chip;
struct trusted_key_payload;
@ -200,44 +201,11 @@ enum tpm_chip_flags {
#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
enum tpm_buf_flags {
/* TPM2B format: */
TPM_BUF_TPM2B = BIT(0),
/* The buffer is in invalid and unusable state: */
TPM_BUF_INVALID = BIT(1),
};
/*
* A buffer for constructing and parsing TPM commands, responses and sized
* (TPM2B) buffers.
*/
struct tpm_buf {
u8 flags;
u16 length;
u16 capacity;
u8 handles;
u8 data[];
};
struct tpm2_hash {
unsigned int crypto_id;
unsigned int tpm_id;
};
void tpm_buf_init(struct tpm_buf *buf, u16 buf_size);
void tpm_buf_init_sized(struct tpm_buf *buf, u16 buf_size);
void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal);
void tpm_buf_reset_sized(struct tpm_buf *buf);
u16 tpm_buf_length(struct tpm_buf *buf);
void tpm_buf_append(struct tpm_buf *buf, const u8 *new_data, u16 new_length);
void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value);
void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value);
void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value);
u8 tpm_buf_read_u8(struct tpm_buf *buf, off_t *offset);
u16 tpm_buf_read_u16(struct tpm_buf *buf, off_t *offset);
u32 tpm_buf_read_u32(struct tpm_buf *buf, off_t *offset);
void tpm_buf_append_handle(struct tpm_buf *buf, u32 handle);
/*
* Check if TPM device is in the firmware upgrade mode.
*/

60
include/linux/tpm_buf.h Normal file
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@ -0,0 +1,60 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Following copyright information was take from the original file
* <include/linux/tpm.h> where the definitions were moved from:
*
* Copyright (C) 2004,2007,2008 IBM Corporation
*
* Authors:
* Leendert van Doorn <leendert@watson.ibm.com>
* Dave Safford <safford@watson.ibm.com>
* Reiner Sailer <sailer@watson.ibm.com>
* Kylene Hall <kjhall@us.ibm.com>
* Debora Velarde <dvelarde@us.ibm.com>
*
* Maintained by: <tpmdd_devel@lists.sourceforge.net>
*
* Device driver for TCG/TCPA TPM (trusted platform module).
* Specifications at www.trustedcomputinggroup.org
*/
#ifndef __LINUX_TPM_BUF_H__
#define __LINUX_TPM_BUF_H__
#include <linux/types.h>
#include <linux/bits.h>
enum tpm_buf_flags {
/* TPM2B format: */
TPM_BUF_TPM2B = BIT(0),
/* The buffer is in invalid and unusable state: */
TPM_BUF_INVALID = BIT(1),
};
/*
* A buffer for constructing and parsing TPM commands, responses and sized
* (TPM2B) buffers.
*/
struct tpm_buf {
u8 flags;
u8 handles;
u16 length;
u16 capacity;
u8 data[];
};
void tpm_buf_init(struct tpm_buf *buf, u16 buf_size);
void tpm_buf_init_sized(struct tpm_buf *buf, u16 buf_size);
void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal);
void tpm_buf_reset_sized(struct tpm_buf *buf);
u16 tpm_buf_length(struct tpm_buf *buf);
void tpm_buf_append(struct tpm_buf *buf, const u8 *new_data, u16 new_length);
void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value);
void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value);
void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value);
u8 tpm_buf_read_u8(struct tpm_buf *buf, off_t *offset);
u16 tpm_buf_read_u16(struct tpm_buf *buf, off_t *offset);
u32 tpm_buf_read_u32(struct tpm_buf *buf, off_t *offset);
void tpm_buf_append_handle(struct tpm_buf *buf, u32 handle);
#endif