efi.c 6.4 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 <log.h>
  11. #include <malloc.h>
  12. #include <sort.h>
  13. static const char *const type_name[] = {
  14. "reserved",
  15. "loader_code",
  16. "loader_data",
  17. "bs_code",
  18. "bs_data",
  19. "rt_code",
  20. "rt_data",
  21. "conv",
  22. "unusable",
  23. "acpi_reclaim",
  24. "acpi_nvs",
  25. "io",
  26. "io_port",
  27. "pal_code",
  28. };
  29. static struct attr_info {
  30. u64 val;
  31. const char *name;
  32. } mem_attr[] = {
  33. { EFI_MEMORY_UC, "uncached" },
  34. { EFI_MEMORY_WC, "write-coalescing" },
  35. { EFI_MEMORY_WT, "write-through" },
  36. { EFI_MEMORY_WB, "write-back" },
  37. { EFI_MEMORY_UCE, "uncached & exported" },
  38. { EFI_MEMORY_WP, "write-protect" },
  39. { EFI_MEMORY_RP, "read-protect" },
  40. { EFI_MEMORY_XP, "execute-protect" },
  41. { EFI_MEMORY_NV, "non-volatile" },
  42. { EFI_MEMORY_MORE_RELIABLE, "higher reliability" },
  43. { EFI_MEMORY_RO, "read-only" },
  44. { EFI_MEMORY_SP, "specific purpose" },
  45. { EFI_MEMORY_RUNTIME, "needs runtime mapping" }
  46. };
  47. /* Maximum different attribute values we can track */
  48. #define ATTR_SEEN_MAX 30
  49. static inline bool is_boot_services(int type)
  50. {
  51. return type == EFI_LOADER_CODE || type == EFI_LOADER_DATA ||
  52. type == EFI_BOOT_SERVICES_CODE ||
  53. type == EFI_BOOT_SERVICES_DATA;
  54. }
  55. static int h_cmp_entry(const void *v1, const void *v2)
  56. {
  57. const struct efi_mem_desc *desc1 = v1;
  58. const struct efi_mem_desc *desc2 = v2;
  59. int64_t diff = desc1->physical_start - desc2->physical_start;
  60. /*
  61. * Manually calculate the difference to avoid sign loss in the 64-bit
  62. * to 32-bit conversion
  63. */
  64. return diff < 0 ? -1 : diff > 0 ? 1 : 0;
  65. }
  66. void *efi_build_mem_table(struct efi_entry_memmap *map, int size, bool skip_bs)
  67. {
  68. struct efi_mem_desc *desc, *end, *base, *dest, *prev;
  69. int count;
  70. u64 addr;
  71. base = malloc(size + sizeof(*desc));
  72. if (!base) {
  73. debug("%s: Cannot allocate %#x bytes\n", __func__, size);
  74. return NULL;
  75. }
  76. end = (struct efi_mem_desc *)((ulong)map + size);
  77. count = ((ulong)end - (ulong)map->desc) / map->desc_size;
  78. memcpy(base, map->desc, (ulong)end - (ulong)map->desc);
  79. qsort(base, count, map->desc_size, h_cmp_entry);
  80. prev = NULL;
  81. addr = 0;
  82. dest = base;
  83. end = (struct efi_mem_desc *)((ulong)base + count * map->desc_size);
  84. for (desc = base; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
  85. bool merge = true;
  86. int type = desc->type;
  87. if (skip_bs && is_boot_services(desc->type))
  88. type = EFI_CONVENTIONAL_MEMORY;
  89. memcpy(dest, desc, map->desc_size);
  90. dest->type = type;
  91. if (!skip_bs || !prev)
  92. merge = false;
  93. else if (desc->physical_start != addr)
  94. merge = false;
  95. else if (type != EFI_CONVENTIONAL_MEMORY)
  96. merge = false;
  97. else if (prev->type != EFI_CONVENTIONAL_MEMORY)
  98. merge = false;
  99. if (merge) {
  100. prev->num_pages += desc->num_pages;
  101. } else {
  102. prev = dest;
  103. dest = efi_get_next_mem_desc(map, dest);
  104. }
  105. addr = desc->physical_start + (desc->num_pages <<
  106. EFI_PAGE_SHIFT);
  107. }
  108. /* Mark the end */
  109. dest->type = EFI_TABLE_END;
  110. return base;
  111. }
  112. static void efi_print_mem_table(struct efi_entry_memmap *map,
  113. struct efi_mem_desc *desc, bool skip_bs)
  114. {
  115. u64 attr_seen[ATTR_SEEN_MAX];
  116. int attr_seen_count;
  117. int upto, i;
  118. u64 addr;
  119. printf(" # %-14s %10s %10s %10s %s\n", "Type", "Physical",
  120. "Virtual", "Size", "Attributes");
  121. /* Keep track of all the different attributes we have seen */
  122. attr_seen_count = 0;
  123. addr = 0;
  124. for (upto = 0; desc->type != EFI_TABLE_END;
  125. upto++, desc = efi_get_next_mem_desc(map, desc)) {
  126. const char *name;
  127. u64 size;
  128. if (skip_bs && is_boot_services(desc->type))
  129. continue;
  130. if (desc->physical_start != addr) {
  131. printf(" %-14s %010llx %10s %010llx\n", "<gap>",
  132. addr, "", desc->physical_start - addr);
  133. }
  134. size = desc->num_pages << EFI_PAGE_SHIFT;
  135. name = desc->type < ARRAY_SIZE(type_name) ?
  136. type_name[desc->type] : "<invalid>";
  137. printf("%2d %x:%-12s %010llx %010llx %010llx ", upto,
  138. desc->type, name, desc->physical_start,
  139. desc->virtual_start, size);
  140. if (desc->attribute & EFI_MEMORY_RUNTIME)
  141. putc('r');
  142. printf("%llx", desc->attribute & ~EFI_MEMORY_RUNTIME);
  143. putc('\n');
  144. for (i = 0; i < attr_seen_count; i++) {
  145. if (attr_seen[i] == desc->attribute)
  146. break;
  147. }
  148. if (i == attr_seen_count && i < ATTR_SEEN_MAX)
  149. attr_seen[attr_seen_count++] = desc->attribute;
  150. addr = desc->physical_start + size;
  151. }
  152. printf("\nAttributes key:\n");
  153. for (i = 0; i < attr_seen_count; i++) {
  154. u64 attr = attr_seen[i];
  155. bool first;
  156. int j;
  157. printf("%c%llx: ", (attr & EFI_MEMORY_RUNTIME) ? 'r' : ' ',
  158. attr & ~EFI_MEMORY_RUNTIME);
  159. for (j = 0, first = true; j < ARRAY_SIZE(mem_attr); j++) {
  160. if (attr & mem_attr[j].val) {
  161. if (first)
  162. first = false;
  163. else
  164. printf(", ");
  165. printf("%s", mem_attr[j].name);
  166. }
  167. }
  168. putc('\n');
  169. }
  170. if (skip_bs)
  171. printf("*Some areas are merged (use 'all' to see)\n");
  172. }
  173. static int do_efi_mem(struct cmd_tbl *cmdtp, int flag, int argc,
  174. char *const argv[])
  175. {
  176. struct efi_mem_desc *desc;
  177. struct efi_entry_memmap *map;
  178. int size, ret;
  179. bool skip_bs;
  180. skip_bs = !argc || *argv[0] != 'a';
  181. ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
  182. switch (ret) {
  183. case -ENOENT:
  184. printf("No EFI table available\n");
  185. goto done;
  186. case -EPROTONOSUPPORT:
  187. printf("Incorrect EFI table version\n");
  188. goto done;
  189. }
  190. printf("EFI table at %lx, memory map %p, size %x, version %x, descr. size %#x\n",
  191. gd->arch.table, map, size, map->version, map->desc_size);
  192. if (map->version != EFI_MEM_DESC_VERSION) {
  193. printf("Incorrect memory map version\n");
  194. ret = -EPROTONOSUPPORT;
  195. goto done;
  196. }
  197. desc = efi_build_mem_table(map, size, skip_bs);
  198. if (!desc) {
  199. ret = -ENOMEM;
  200. goto done;
  201. }
  202. efi_print_mem_table(map, desc, skip_bs);
  203. free(desc);
  204. done:
  205. if (ret)
  206. printf("Error: %d\n", ret);
  207. return ret ? CMD_RET_FAILURE : 0;
  208. }
  209. static struct cmd_tbl efi_commands[] = {
  210. U_BOOT_CMD_MKENT(mem, 1, 1, do_efi_mem, "", ""),
  211. };
  212. static int do_efi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  213. {
  214. struct cmd_tbl *efi_cmd;
  215. int ret;
  216. if (argc < 2)
  217. return CMD_RET_USAGE;
  218. efi_cmd = find_cmd_tbl(argv[1], efi_commands, ARRAY_SIZE(efi_commands));
  219. argc -= 2;
  220. argv += 2;
  221. if (!efi_cmd || argc > efi_cmd->maxargs)
  222. return CMD_RET_USAGE;
  223. ret = efi_cmd->cmd(efi_cmd, flag, argc, argv);
  224. return cmd_process_error(efi_cmd, ret);
  225. }
  226. U_BOOT_CMD(
  227. efi, 3, 1, do_efi,
  228. "EFI access",
  229. "mem [all] Dump memory information [include boot services]"
  230. );