tpm-common.c 3.7 KB

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  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. #define LOG_CATEGORY UCLASS_TPM
  7. #include <common.h>
  8. #include <dm.h>
  9. #include <log.h>
  10. #include <asm/unaligned.h>
  11. #include <tpm-common.h>
  12. #include "tpm-utils.h"
  13. enum tpm_version tpm_get_version(struct udevice *dev)
  14. {
  15. struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
  16. return priv->version;
  17. }
  18. int pack_byte_string(u8 *str, size_t size, const char *format, ...)
  19. {
  20. va_list args;
  21. size_t offset = 0, length = 0;
  22. u8 *data = NULL;
  23. u32 value = 0;
  24. va_start(args, format);
  25. for (; *format; format++) {
  26. switch (*format) {
  27. case 'b':
  28. offset = va_arg(args, size_t);
  29. value = va_arg(args, int);
  30. length = 1;
  31. break;
  32. case 'w':
  33. offset = va_arg(args, size_t);
  34. value = va_arg(args, int);
  35. length = 2;
  36. break;
  37. case 'd':
  38. offset = va_arg(args, size_t);
  39. value = va_arg(args, u32);
  40. length = 4;
  41. break;
  42. case 's':
  43. offset = va_arg(args, size_t);
  44. data = va_arg(args, u8 *);
  45. length = va_arg(args, u32);
  46. break;
  47. default:
  48. debug("Couldn't recognize format string\n");
  49. va_end(args);
  50. return -1;
  51. }
  52. if (offset + length > size) {
  53. va_end(args);
  54. return -1;
  55. }
  56. switch (*format) {
  57. case 'b':
  58. str[offset] = value;
  59. break;
  60. case 'w':
  61. put_unaligned_be16(value, str + offset);
  62. break;
  63. case 'd':
  64. put_unaligned_be32(value, str + offset);
  65. break;
  66. case 's':
  67. memcpy(str + offset, data, length);
  68. break;
  69. }
  70. }
  71. va_end(args);
  72. return 0;
  73. }
  74. int unpack_byte_string(const u8 *str, size_t size, const char *format, ...)
  75. {
  76. va_list args;
  77. size_t offset = 0, length = 0;
  78. u8 *ptr8 = NULL;
  79. u16 *ptr16 = NULL;
  80. u32 *ptr32 = NULL;
  81. va_start(args, format);
  82. for (; *format; format++) {
  83. switch (*format) {
  84. case 'b':
  85. offset = va_arg(args, size_t);
  86. ptr8 = va_arg(args, u8 *);
  87. length = 1;
  88. break;
  89. case 'w':
  90. offset = va_arg(args, size_t);
  91. ptr16 = va_arg(args, u16 *);
  92. length = 2;
  93. break;
  94. case 'd':
  95. offset = va_arg(args, size_t);
  96. ptr32 = va_arg(args, u32 *);
  97. length = 4;
  98. break;
  99. case 's':
  100. offset = va_arg(args, size_t);
  101. ptr8 = va_arg(args, u8 *);
  102. length = va_arg(args, u32);
  103. break;
  104. default:
  105. va_end(args);
  106. debug("Couldn't recognize format string\n");
  107. return -1;
  108. }
  109. if (offset + length > size) {
  110. va_end(args);
  111. log_err("Failed to read: size=%zd, offset=%zx, len=%zx\n",
  112. size, offset, length);
  113. return -1;
  114. }
  115. switch (*format) {
  116. case 'b':
  117. *ptr8 = str[offset];
  118. break;
  119. case 'w':
  120. *ptr16 = get_unaligned_be16(str + offset);
  121. break;
  122. case 'd':
  123. *ptr32 = get_unaligned_be32(str + offset);
  124. break;
  125. case 's':
  126. memcpy(ptr8, str + offset, length);
  127. break;
  128. }
  129. }
  130. va_end(args);
  131. return 0;
  132. }
  133. u32 tpm_command_size(const void *command)
  134. {
  135. const size_t command_size_offset = 2;
  136. return get_unaligned_be32(command + command_size_offset);
  137. }
  138. u32 tpm_return_code(const void *response)
  139. {
  140. const size_t return_code_offset = 6;
  141. return get_unaligned_be32(response + return_code_offset);
  142. }
  143. u32 tpm_sendrecv_command(struct udevice *dev, const void *command,
  144. void *response, size_t *size_ptr)
  145. {
  146. int err, ret;
  147. u8 response_buffer[COMMAND_BUFFER_SIZE];
  148. size_t response_length;
  149. int i;
  150. if (response) {
  151. response_length = *size_ptr;
  152. } else {
  153. response = response_buffer;
  154. response_length = sizeof(response_buffer);
  155. }
  156. err = tpm_xfer(dev, command, tpm_command_size(command),
  157. response, &response_length);
  158. if (err < 0)
  159. return err;
  160. if (size_ptr)
  161. *size_ptr = response_length;
  162. ret = tpm_return_code(response);
  163. log_debug("TPM response [ret:%d]: ", ret);
  164. for (i = 0; i < response_length; i++)
  165. log_debug("%02x ", ((u8 *)response)[i]);
  166. log_debug("\n");
  167. return ret;
  168. }
  169. int tpm_init(struct udevice *dev)
  170. {
  171. return tpm_open(dev);
  172. }