stm32image.c 3.8 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. /* default binary type for U-Boot */
  16. #define HEADER_TYPE_UBOOT (cpu_to_le32(0x00000000))
  17. struct stm32_header {
  18. uint32_t magic_number;
  19. uint32_t image_signature[64 / 4];
  20. uint32_t image_checksum;
  21. uint8_t header_version[4];
  22. uint32_t image_length;
  23. uint32_t image_entry_point;
  24. uint32_t reserved1;
  25. uint32_t load_address;
  26. uint32_t reserved2;
  27. uint32_t version_number;
  28. uint32_t option_flags;
  29. uint32_t ecdsa_algorithm;
  30. uint32_t ecdsa_public_key[64 / 4];
  31. uint32_t padding[83 / 4];
  32. uint32_t binary_type;
  33. };
  34. static struct stm32_header stm32image_header;
  35. static void stm32image_default_header(struct stm32_header *ptr)
  36. {
  37. if (!ptr)
  38. return;
  39. ptr->magic_number = HEADER_MAGIC;
  40. ptr->header_version[VER_MAJOR_IDX] = HEADER_VERSION_V1;
  41. ptr->option_flags = HEADER_DEFAULT_OPTION;
  42. ptr->ecdsa_algorithm = cpu_to_le32(1);
  43. ptr->binary_type = HEADER_TYPE_UBOOT;
  44. }
  45. static uint32_t stm32image_checksum(void *start, uint32_t len)
  46. {
  47. uint32_t csum = 0;
  48. uint32_t hdr_len = sizeof(struct stm32_header);
  49. uint8_t *p;
  50. if (len < hdr_len)
  51. return 0;
  52. p = start + hdr_len;
  53. len -= hdr_len;
  54. while (len > 0) {
  55. csum += *p;
  56. p++;
  57. len--;
  58. }
  59. return csum;
  60. }
  61. static int stm32image_check_image_types(uint8_t type)
  62. {
  63. if (type == IH_TYPE_STM32IMAGE)
  64. return EXIT_SUCCESS;
  65. return EXIT_FAILURE;
  66. }
  67. static int stm32image_verify_header(unsigned char *ptr, int image_size,
  68. struct image_tool_params *params)
  69. {
  70. struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
  71. int i;
  72. if (image_size < sizeof(struct stm32_header))
  73. return -1;
  74. if (stm32hdr->magic_number != HEADER_MAGIC)
  75. return -1;
  76. if (stm32hdr->header_version[VER_MAJOR_IDX] != HEADER_VERSION_V1)
  77. return -1;
  78. if (stm32hdr->reserved1 || stm32hdr->reserved2)
  79. return -1;
  80. for (i = 0; i < (sizeof(stm32hdr->padding) / 4); i++) {
  81. if (stm32hdr->padding[i] != 0)
  82. return -1;
  83. }
  84. return 0;
  85. }
  86. static void stm32image_print_header(const void *ptr)
  87. {
  88. struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
  89. printf("Image Type : STMicroelectronics STM32 V%d.%d\n",
  90. stm32hdr->header_version[VER_MAJOR_IDX],
  91. stm32hdr->header_version[VER_MINOR_IDX]);
  92. printf("Image Size : %lu bytes\n",
  93. (unsigned long)le32_to_cpu(stm32hdr->image_length));
  94. printf("Image Load : 0x%08x\n",
  95. le32_to_cpu(stm32hdr->load_address));
  96. printf("Entry Point : 0x%08x\n",
  97. le32_to_cpu(stm32hdr->image_entry_point));
  98. printf("Checksum : 0x%08x\n",
  99. le32_to_cpu(stm32hdr->image_checksum));
  100. printf("Option : 0x%08x\n",
  101. le32_to_cpu(stm32hdr->option_flags));
  102. printf("BinaryType : 0x%08x\n",
  103. le32_to_cpu(stm32hdr->binary_type));
  104. }
  105. static void stm32image_set_header(void *ptr, struct stat *sbuf, int ifd,
  106. struct image_tool_params *params)
  107. {
  108. struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
  109. stm32image_default_header(stm32hdr);
  110. stm32hdr->load_address = cpu_to_le32(params->addr);
  111. stm32hdr->image_entry_point = cpu_to_le32(params->ep);
  112. stm32hdr->image_length = cpu_to_le32((uint32_t)sbuf->st_size -
  113. sizeof(struct stm32_header));
  114. stm32hdr->image_checksum =
  115. cpu_to_le32(stm32image_checksum(ptr, sbuf->st_size));
  116. }
  117. /*
  118. * stm32image parameters
  119. */
  120. U_BOOT_IMAGE_TYPE(
  121. stm32image,
  122. "STMicroelectronics STM32MP Image support",
  123. sizeof(struct stm32_header),
  124. (void *)&stm32image_header,
  125. NULL,
  126. stm32image_verify_header,
  127. stm32image_print_header,
  128. stm32image_set_header,
  129. NULL,
  130. stm32image_check_image_types,
  131. NULL,
  132. NULL
  133. );