stm32image.c 3.6 KB

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