efi.c 6.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2015 Google, Inc
  4. * Written by Simon Glass <sjg@chromium.org>
  5. */
  6. #include <common.h>
  7. #include <command.h>
  8. #include <efi.h>
  9. #include <errno.h>
  10. #include <malloc.h>
  11. static const char *const type_name[] = {
  12. "reserved",
  13. "loader_code",
  14. "loader_data",
  15. "bs_code",
  16. "bs_data",
  17. "rt_code",
  18. "rt_data",
  19. "conv",
  20. "unusable",
  21. "acpi_reclaim",
  22. "acpi_nvs",
  23. "io",
  24. "io_port",
  25. "pal_code",
  26. };
  27. static struct attr_info {
  28. u64 val;
  29. const char *name;
  30. } mem_attr[] = {
  31. { EFI_MEMORY_UC, "uncached" },
  32. { EFI_MEMORY_WC, "write-coalescing" },
  33. { EFI_MEMORY_WT, "write-through" },
  34. { EFI_MEMORY_WB, "write-back" },
  35. { EFI_MEMORY_UCE, "uncached & exported" },
  36. { EFI_MEMORY_WP, "write-protect" },
  37. { EFI_MEMORY_RP, "read-protect" },
  38. { EFI_MEMORY_XP, "execute-protect" },
  39. { EFI_MEMORY_NV, "non-volatile" },
  40. { EFI_MEMORY_MORE_RELIABLE, "higher reliability" },
  41. { EFI_MEMORY_RO, "read-only" },
  42. { EFI_MEMORY_RUNTIME, "needs runtime mapping" }
  43. };
  44. /* Maximum different attribute values we can track */
  45. #define ATTR_SEEN_MAX 30
  46. static inline bool is_boot_services(int type)
  47. {
  48. return type == EFI_LOADER_CODE || type == EFI_LOADER_DATA ||
  49. type == EFI_BOOT_SERVICES_CODE ||
  50. type == EFI_BOOT_SERVICES_DATA;
  51. }
  52. static int h_cmp_entry(const void *v1, const void *v2)
  53. {
  54. const struct efi_mem_desc *desc1 = v1;
  55. const struct efi_mem_desc *desc2 = v2;
  56. int64_t diff = desc1->physical_start - desc2->physical_start;
  57. /*
  58. * Manually calculate the difference to avoid sign loss in the 64-bit
  59. * to 32-bit conversion
  60. */
  61. return diff < 0 ? -1 : diff > 0 ? 1 : 0;
  62. }
  63. void *efi_build_mem_table(struct efi_entry_memmap *map, int size, bool skip_bs)
  64. {
  65. struct efi_mem_desc *desc, *end, *base, *dest, *prev;
  66. int count;
  67. u64 addr;
  68. base = malloc(size + sizeof(*desc));
  69. if (!base) {
  70. debug("%s: Cannot allocate %#x bytes\n", __func__, size);
  71. return NULL;
  72. }
  73. end = (struct efi_mem_desc *)((ulong)map + size);
  74. count = ((ulong)end - (ulong)map->desc) / map->desc_size;
  75. memcpy(base, map->desc, (ulong)end - (ulong)map->desc);
  76. qsort(base, count, map->desc_size, h_cmp_entry);
  77. prev = NULL;
  78. addr = 0;
  79. dest = base;
  80. end = (struct efi_mem_desc *)((ulong)base + count * map->desc_size);
  81. for (desc = base; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
  82. bool merge = true;
  83. int type = desc->type;
  84. if (skip_bs && is_boot_services(desc->type))
  85. type = EFI_CONVENTIONAL_MEMORY;
  86. memcpy(dest, desc, map->desc_size);
  87. dest->type = type;
  88. if (!skip_bs || !prev)
  89. merge = false;
  90. else if (desc->physical_start != addr)
  91. merge = false;
  92. else if (type != EFI_CONVENTIONAL_MEMORY)
  93. merge = false;
  94. else if (prev->type != EFI_CONVENTIONAL_MEMORY)
  95. merge = false;
  96. if (merge) {
  97. prev->num_pages += desc->num_pages;
  98. } else {
  99. prev = dest;
  100. dest = efi_get_next_mem_desc(map, dest);
  101. }
  102. addr = desc->physical_start + (desc->num_pages <<
  103. EFI_PAGE_SHIFT);
  104. }
  105. /* Mark the end */
  106. dest->type = EFI_TABLE_END;
  107. return base;
  108. }
  109. static void efi_print_mem_table(struct efi_entry_memmap *map,
  110. struct efi_mem_desc *desc, bool skip_bs)
  111. {
  112. u64 attr_seen[ATTR_SEEN_MAX];
  113. int attr_seen_count;
  114. int upto, i;
  115. u64 addr;
  116. printf(" # %-14s %10s %10s %10s %s\n", "Type", "Physical",
  117. "Virtual", "Size", "Attributes");
  118. /* Keep track of all the different attributes we have seen */
  119. attr_seen_count = 0;
  120. addr = 0;
  121. for (upto = 0; desc->type != EFI_TABLE_END;
  122. upto++, desc = efi_get_next_mem_desc(map, desc)) {
  123. const char *name;
  124. u64 size;
  125. if (skip_bs && is_boot_services(desc->type))
  126. continue;
  127. if (desc->physical_start != addr) {
  128. printf(" %-14s %010llx %10s %010llx\n", "<gap>",
  129. addr, "", desc->physical_start - addr);
  130. }
  131. size = desc->num_pages << EFI_PAGE_SHIFT;
  132. name = desc->type < ARRAY_SIZE(type_name) ?
  133. type_name[desc->type] : "<invalid>";
  134. printf("%2d %x:%-12s %010llx %010llx %010llx ", upto,
  135. desc->type, name, desc->physical_start,
  136. desc->virtual_start, size);
  137. if (desc->attribute & EFI_MEMORY_RUNTIME)
  138. putc('r');
  139. printf("%llx", desc->attribute & ~EFI_MEMORY_RUNTIME);
  140. putc('\n');
  141. for (i = 0; i < attr_seen_count; i++) {
  142. if (attr_seen[i] == desc->attribute)
  143. break;
  144. }
  145. if (i == attr_seen_count && i < ATTR_SEEN_MAX)
  146. attr_seen[attr_seen_count++] = desc->attribute;
  147. addr = desc->physical_start + size;
  148. }
  149. printf("\nAttributes key:\n");
  150. for (i = 0; i < attr_seen_count; i++) {
  151. u64 attr = attr_seen[i];
  152. bool first;
  153. int j;
  154. printf("%c%llx: ", (attr & EFI_MEMORY_RUNTIME) ? 'r' : ' ',
  155. attr & ~EFI_MEMORY_RUNTIME);
  156. for (j = 0, first = true; j < ARRAY_SIZE(mem_attr); j++) {
  157. if (attr & mem_attr[j].val) {
  158. if (first)
  159. first = false;
  160. else
  161. printf(", ");
  162. printf("%s", mem_attr[j].name);
  163. }
  164. }
  165. putc('\n');
  166. }
  167. if (skip_bs)
  168. printf("*Some areas are merged (use 'all' to see)\n");
  169. }
  170. static int do_efi_mem(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  171. {
  172. struct efi_mem_desc *desc;
  173. struct efi_entry_memmap *map;
  174. int size, ret;
  175. bool skip_bs;
  176. skip_bs = !argc || *argv[0] != 'a';
  177. ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
  178. switch (ret) {
  179. case -ENOENT:
  180. printf("No EFI table available\n");
  181. goto done;
  182. case -EPROTONOSUPPORT:
  183. printf("Incorrect EFI table version\n");
  184. goto done;
  185. }
  186. printf("EFI table at %lx, memory map %p, size %x, version %x, descr. size %#x\n",
  187. gd->arch.table, map, size, map->version, map->desc_size);
  188. if (map->version != EFI_MEM_DESC_VERSION) {
  189. printf("Incorrect memory map version\n");
  190. ret = -EPROTONOSUPPORT;
  191. goto done;
  192. }
  193. desc = efi_build_mem_table(map, size, skip_bs);
  194. if (!desc) {
  195. ret = -ENOMEM;
  196. goto done;
  197. }
  198. efi_print_mem_table(map, desc, skip_bs);
  199. free(desc);
  200. done:
  201. if (ret)
  202. printf("Error: %d\n", ret);
  203. return ret ? CMD_RET_FAILURE : 0;
  204. }
  205. static cmd_tbl_t efi_commands[] = {
  206. U_BOOT_CMD_MKENT(mem, 1, 1, do_efi_mem, "", ""),
  207. };
  208. static int do_efi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  209. {
  210. cmd_tbl_t *efi_cmd;
  211. int ret;
  212. if (argc < 2)
  213. return CMD_RET_USAGE;
  214. efi_cmd = find_cmd_tbl(argv[1], efi_commands, ARRAY_SIZE(efi_commands));
  215. argc -= 2;
  216. argv += 2;
  217. if (!efi_cmd || argc > efi_cmd->maxargs)
  218. return CMD_RET_USAGE;
  219. ret = efi_cmd->cmd(efi_cmd, flag, argc, argv);
  220. return cmd_process_error(efi_cmd, ret);
  221. }
  222. U_BOOT_CMD(
  223. efi, 3, 1, do_efi,
  224. "EFI access",
  225. "mem [all] Dump memory information [include boot services]"
  226. );