LXR uboot/lib/tpm-utils.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * Copyright (c) 2013 The Chromium OS Authors.
   4 * Coypright (c) 2013 Guntermann & Drunck GmbH
   5 */
   6
   7#ifndef __TPM_UTILS_H
   8#define __TPM_UTILS_H
   9
  10#define COMMAND_BUFFER_SIZE 256
  11
  12/* Internal error of TPM command library */
  13#define TPM_LIB_ERROR ((u32)~0u)
  14
  15/* To make strings of commands more easily */
  16#define __MSB(x) ((x) >> 8)
  17#define __LSB(x) ((x) & 0xFF)
  18#define tpm_u16(x) __MSB(x), __LSB(x)
  19#define tpm_u32(x) tpm_u16((x) >> 16), tpm_u16((x) & 0xFFFF)
  20
  21/**
  22 * Pack data into a byte string.  The data types are specified in
  23 * the format string: 'b' means unsigned byte, 'w' unsigned word,
  24 * 'd' unsigned double word, and 's' byte string.  The data are a
  25 * series of offsets and values (for type byte string there are also
  26 * lengths).  The data values are packed into the byte string
  27 * sequentially, and so a latter value could over-write a former
  28 * value.
  29 *
  30 * @param str           output string
  31 * @param size          size of output string
  32 * @param format        format string
  33 * @param ...           data points
  34 * @return 0 on success, non-0 on error
  35 */
  36int pack_byte_string(u8 *str, size_t size, const char *format, ...);
  37
  38/**
  39 * Unpack data from a byte string.  The data types are specified in
  40 * the format string: 'b' means unsigned byte, 'w' unsigned word,
  41 * 'd' unsigned double word, and 's' byte string.  The data are a
  42 * series of offsets and pointers (for type byte string there are also
  43 * lengths).
  44 *
  45 * @param str           output string
  46 * @param size          size of output string
  47 * @param format        format string
  48 * @param ...           data points
  49 * @return 0 on success, non-0 on error
  50 */
  51int unpack_byte_string(const u8 *str, size_t size, const char *format, ...);
  52
  53/**
  54 * Get TPM command size.
  55 *
  56 * @param command       byte string of TPM command
  57 * @return command size of the TPM command
  58 */
  59u32 tpm_command_size(const void *command);
  60
  61/**
  62 * Get TPM response return code, which is one of TPM_RESULT values.
  63 *
  64 * @param response      byte string of TPM response
  65 * @return return code of the TPM response
  66 */
  67u32 tpm_return_code(const void *response);
  68
  69/**
  70 * Send a TPM command and return response's return code, and optionally
  71 * return response to caller.
  72 *
  73 * @param command       byte string of TPM command
  74 * @param response      output buffer for TPM response, or NULL if the
  75 *                      caller does not care about it
  76 * @param size_ptr      output buffer size (input parameter) and TPM
  77 *                      response length (output parameter); this parameter
  78 *                      is a bidirectional
  79 * @return return code of the TPM response
  80 */
  81u32 tpm_sendrecv_command(struct udevice *dev, const void *command,
  82                         void *response, size_t *size_ptr);
  83
  84#endif /* __TPM_UTILS_H */
  85