stm32image.c 3.6 KB

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  1. /*
  2. * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
  3. *
  4. * SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
  5. */
  6. #include <image.h>
  7. #include "imagetool.h"
  8. /* magic ='S' 'T' 'M' 0x32 */
  9. #define HEADER_MAGIC be32_to_cpu(0x53544D32)
  10. #define VER_MAJOR_IDX 2
  11. #define VER_MINOR_IDX 1
  12. #define VER_VARIANT_IDX 0
  13. #define HEADER_VERSION_V1 0x1
  14. /* default option : bit0 => no signature */
  15. #define HEADER_DEFAULT_OPTION (cpu_to_le32(0x00000001))
  16. struct stm32_header {
  17. uint32_t magic_number;
  18. uint32_t image_signature[64 / 4];
  19. uint32_t image_checksum;
  20. uint8_t header_version[4];
  21. uint32_t image_length;
  22. uint32_t image_entry_point;
  23. uint32_t reserved1;
  24. uint32_t load_address;
  25. uint32_t reserved2;
  26. uint32_t version_number;
  27. uint32_t option_flags;
  28. uint32_t ecdsa_algorithm;
  29. uint32_t ecdsa_public_key[64 / 4];
  30. uint32_t padding[84 / 4];
  31. };
  32. static struct stm32_header stm32image_header;
  33. static void stm32image_default_header(struct stm32_header *ptr)
  34. {
  35. if (!ptr)
  36. return;
  37. ptr->magic_number = HEADER_MAGIC;
  38. ptr->header_version[VER_MAJOR_IDX] = HEADER_VERSION_V1;
  39. ptr->option_flags = HEADER_DEFAULT_OPTION;
  40. ptr->ecdsa_algorithm = 1;
  41. }
  42. static uint32_t stm32image_checksum(void *start, uint32_t len)
  43. {
  44. uint32_t csum = 0;
  45. uint32_t hdr_len = sizeof(struct stm32_header);
  46. uint8_t *p;
  47. if (len < hdr_len)
  48. return 0;
  49. p = start + hdr_len;
  50. len -= hdr_len;
  51. while (len > 0) {
  52. csum += *p;
  53. p++;
  54. len--;
  55. }
  56. return csum;
  57. }
  58. static int stm32image_check_image_types(uint8_t type)
  59. {
  60. if (type == IH_TYPE_STM32IMAGE)
  61. return EXIT_SUCCESS;
  62. return EXIT_FAILURE;
  63. }
  64. static int stm32image_verify_header(unsigned char *ptr, int image_size,
  65. struct image_tool_params *params)
  66. {
  67. struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
  68. int i;
  69. if (image_size < sizeof(struct stm32_header))
  70. return -1;
  71. if (stm32hdr->magic_number != HEADER_MAGIC)
  72. return -1;
  73. if (stm32hdr->header_version[VER_MAJOR_IDX] != HEADER_VERSION_V1)
  74. return -1;
  75. if (stm32hdr->reserved1 || stm32hdr->reserved2)
  76. return -1;
  77. for (i = 0; i < (sizeof(stm32hdr->padding) / 4); i++) {
  78. if (stm32hdr->padding[i] != 0)
  79. return -1;
  80. }
  81. return 0;
  82. }
  83. static void stm32image_print_header(const void *ptr)
  84. {
  85. struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
  86. printf("Image Type : STMicroelectronics STM32 V%d.%d\n",
  87. stm32hdr->header_version[VER_MAJOR_IDX],
  88. stm32hdr->header_version[VER_MINOR_IDX]);
  89. printf("Image Size : %lu bytes\n",
  90. (unsigned long)le32_to_cpu(stm32hdr->image_length));
  91. printf("Image Load : 0x%08x\n",
  92. le32_to_cpu(stm32hdr->load_address));
  93. printf("Entry Point : 0x%08x\n",
  94. le32_to_cpu(stm32hdr->image_entry_point));
  95. printf("Checksum : 0x%08x\n",
  96. le32_to_cpu(stm32hdr->image_checksum));
  97. printf("Option : 0x%08x\n",
  98. le32_to_cpu(stm32hdr->option_flags));
  99. }
  100. static void stm32image_set_header(void *ptr, struct stat *sbuf, int ifd,
  101. struct image_tool_params *params)
  102. {
  103. struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
  104. stm32image_default_header(stm32hdr);
  105. stm32hdr->load_address = cpu_to_le32(params->addr);
  106. stm32hdr->image_entry_point = cpu_to_le32(params->ep);
  107. stm32hdr->image_length = cpu_to_le32((uint32_t)sbuf->st_size -
  108. sizeof(struct stm32_header));
  109. stm32hdr->image_checksum = stm32image_checksum(ptr, sbuf->st_size);
  110. }
  111. /*
  112. * stm32image parameters
  113. */
  114. U_BOOT_IMAGE_TYPE(
  115. stm32image,
  116. "STMicroelectronics STM32MP Image support",
  117. sizeof(struct stm32_header),
  118. (void *)&stm32image_header,
  119. NULL,
  120. stm32image_verify_header,
  121. stm32image_print_header,
  122. stm32image_set_header,
  123. NULL,
  124. stm32image_check_image_types,
  125. NULL,
  126. NULL
  127. );