linux/drivers/char/tpm/tpm-buf.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Handling of TPM command and other buffers.
 */

#include <linux/tpm_command.h>
#include <linux/module.h>
#include <linux/tpm.h>

/**
 * tpm_buf_init() - Allocate and initialize a TPM command
 * @buf:	A &tpm_buf
 * @tag:	TPM_TAG_RQU_COMMAND, TPM2_ST_NO_SESSIONS or TPM2_ST_SESSIONS
 * @ordinal:	A command ordinal
 *
 * Return: 0 or -ENOMEM
 */
int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * tpm_buf_reset() - Initialize a TPM command
 * @buf:	A &tpm_buf
 * @tag:	TPM_TAG_RQU_COMMAND, TPM2_ST_NO_SESSIONS or TPM2_ST_SESSIONS
 * @ordinal:	A command ordinal
 */
void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * tpm_buf_init_sized() - Allocate and initialize a sized (TPM2B) buffer
 * @buf:	A @tpm_buf
 *
 * Return: 0 or -ENOMEM
 */
int tpm_buf_init_sized(struct tpm_buf *buf)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * tpm_buf_reset_sized() - Initialize a sized buffer
 * @buf:	A &tpm_buf
 */
void tpm_buf_reset_sized(struct tpm_buf *buf)
{ … }
EXPORT_SYMBOL_GPL(…);

void tpm_buf_destroy(struct tpm_buf *buf)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * tpm_buf_length() - Return the number of bytes consumed by the data
 * @buf:	A &tpm_buf
 *
 * Return: The number of bytes consumed by the buffer
 */
u32 tpm_buf_length(struct tpm_buf *buf)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * tpm_buf_append() - Append data to an initialized buffer
 * @buf:	A &tpm_buf
 * @new_data:	A data blob
 * @new_length:	Size of the appended data
 */
void tpm_buf_append(struct tpm_buf *buf, const u8 *new_data, u16 new_length)
{ … }
EXPORT_SYMBOL_GPL(…);

void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
{ … }
EXPORT_SYMBOL_GPL(…);

void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
{ … }
EXPORT_SYMBOL_GPL(…);

void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * tpm_buf_read() - Read from a TPM buffer
 * @buf:	&tpm_buf instance
 * @offset:	offset within the buffer
 * @count:	the number of bytes to read
 * @output:	the output buffer
 */
static void tpm_buf_read(struct tpm_buf *buf, off_t *offset, size_t count, void *output)
{ … }

/**
 * tpm_buf_read_u8() - Read 8-bit word from a TPM buffer
 * @buf:	&tpm_buf instance
 * @offset:	offset within the buffer
 *
 * Return: next 8-bit word
 */
u8 tpm_buf_read_u8(struct tpm_buf *buf, off_t *offset)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * tpm_buf_read_u16() - Read 16-bit word from a TPM buffer
 * @buf:	&tpm_buf instance
 * @offset:	offset within the buffer
 *
 * Return: next 16-bit word
 */
u16 tpm_buf_read_u16(struct tpm_buf *buf, off_t *offset)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * tpm_buf_read_u32() - Read 32-bit word from a TPM buffer
 * @buf:	&tpm_buf instance
 * @offset:	offset within the buffer
 *
 * Return: next 32-bit word
 */
u32 tpm_buf_read_u32(struct tpm_buf *buf, off_t *offset)
{ … }
EXPORT_SYMBOL_GPL(…);