efi.c 7.0 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. #include <asm/global_data.h>
  14. static const char *const type_name[] = {
  15. "reserved",
  16. "loader_code",
  17. "loader_data",
  18. "bs_code",
  19. "bs_data",
  20. "rt_code",
  21. "rt_data",
  22. "conv",
  23. "unusable",
  24. "acpi_reclaim",
  25. "acpi_nvs",
  26. "io",
  27. "io_port",
  28. "pal_code",
  29. };
  30. static struct attr_info {
  31. u64 val;
  32. const char *name;
  33. } mem_attr[] = {
  34. { EFI_MEMORY_UC, "uncached" },
  35. { EFI_MEMORY_WC, "write-coalescing" },
  36. { EFI_MEMORY_WT, "write-through" },
  37. { EFI_MEMORY_WB, "write-back" },
  38. { EFI_MEMORY_UCE, "uncached & exported" },
  39. { EFI_MEMORY_WP, "write-protect" },
  40. { EFI_MEMORY_RP, "read-protect" },
  41. { EFI_MEMORY_XP, "execute-protect" },
  42. { EFI_MEMORY_NV, "non-volatile" },
  43. { EFI_MEMORY_MORE_RELIABLE, "higher reliability" },
  44. { EFI_MEMORY_RO, "read-only" },
  45. { EFI_MEMORY_SP, "specific purpose" },
  46. { EFI_MEMORY_RUNTIME, "needs runtime mapping" }
  47. };
  48. /* Maximum different attribute values we can track */
  49. #define ATTR_SEEN_MAX 30
  50. static inline bool is_boot_services(int type)
  51. {
  52. return type == EFI_LOADER_CODE || type == EFI_LOADER_DATA ||
  53. type == EFI_BOOT_SERVICES_CODE ||
  54. type == EFI_BOOT_SERVICES_DATA;
  55. }
  56. static int h_cmp_entry(const void *v1, const void *v2)
  57. {
  58. const struct efi_mem_desc *desc1 = v1;
  59. const struct efi_mem_desc *desc2 = v2;
  60. int64_t diff = desc1->physical_start - desc2->physical_start;
  61. /*
  62. * Manually calculate the difference to avoid sign loss in the 64-bit
  63. * to 32-bit conversion
  64. */
  65. return diff < 0 ? -1 : diff > 0 ? 1 : 0;
  66. }
  67. /**
  68. * efi_build_mem_table() - make a sorted copy of the memory table
  69. *
  70. * @map: Pointer to EFI memory map table
  71. * @size: Size of table in bytes
  72. * @skip_bs: True to skip boot-time memory and merge it with conventional
  73. * memory. This will significantly reduce the number of table
  74. * entries.
  75. * Return: pointer to the new table. It should be freed with free() by the
  76. * caller.
  77. */
  78. static void *efi_build_mem_table(struct efi_entry_memmap *map, int size,
  79. bool skip_bs)
  80. {
  81. struct efi_mem_desc *desc, *end, *base, *dest, *prev;
  82. int count;
  83. u64 addr;
  84. base = malloc(size + sizeof(*desc));
  85. if (!base) {
  86. debug("%s: Cannot allocate %#x bytes\n", __func__, size);
  87. return NULL;
  88. }
  89. end = (struct efi_mem_desc *)((ulong)map + size);
  90. count = ((ulong)end - (ulong)map->desc) / map->desc_size;
  91. memcpy(base, map->desc, (ulong)end - (ulong)map->desc);
  92. qsort(base, count, map->desc_size, h_cmp_entry);
  93. prev = NULL;
  94. addr = 0;
  95. dest = base;
  96. end = (struct efi_mem_desc *)((ulong)base + count * map->desc_size);
  97. for (desc = base; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
  98. bool merge = true;
  99. u32 type = desc->type;
  100. if (type >= EFI_MAX_MEMORY_TYPE) {
  101. printf("Memory map contains invalid entry type %u\n",
  102. type);
  103. continue;
  104. }
  105. if (skip_bs && is_boot_services(desc->type))
  106. type = EFI_CONVENTIONAL_MEMORY;
  107. memcpy(dest, desc, map->desc_size);
  108. dest->type = type;
  109. if (!skip_bs || !prev)
  110. merge = false;
  111. else if (desc->physical_start != addr)
  112. merge = false;
  113. else if (type != EFI_CONVENTIONAL_MEMORY)
  114. merge = false;
  115. else if (prev->type != EFI_CONVENTIONAL_MEMORY)
  116. merge = false;
  117. if (merge) {
  118. prev->num_pages += desc->num_pages;
  119. } else {
  120. prev = dest;
  121. dest = efi_get_next_mem_desc(map, dest);
  122. }
  123. addr = desc->physical_start + (desc->num_pages <<
  124. EFI_PAGE_SHIFT);
  125. }
  126. /* Mark the end */
  127. dest->type = EFI_MAX_MEMORY_TYPE;
  128. return base;
  129. }
  130. static void efi_print_mem_table(struct efi_entry_memmap *map,
  131. struct efi_mem_desc *desc, bool skip_bs)
  132. {
  133. u64 attr_seen[ATTR_SEEN_MAX];
  134. int attr_seen_count;
  135. int upto, i;
  136. u64 addr;
  137. printf(" # %-14s %10s %10s %10s %s\n", "Type", "Physical",
  138. "Virtual", "Size", "Attributes");
  139. /* Keep track of all the different attributes we have seen */
  140. attr_seen_count = 0;
  141. addr = 0;
  142. for (upto = 0; desc->type != EFI_MAX_MEMORY_TYPE;
  143. upto++, desc = efi_get_next_mem_desc(map, desc)) {
  144. const char *name;
  145. u64 size;
  146. if (skip_bs && is_boot_services(desc->type))
  147. continue;
  148. if (desc->physical_start != addr) {
  149. printf(" %-14s %010llx %10s %010llx\n", "<gap>",
  150. addr, "", desc->physical_start - addr);
  151. }
  152. size = desc->num_pages << EFI_PAGE_SHIFT;
  153. name = desc->type < ARRAY_SIZE(type_name) ?
  154. type_name[desc->type] : "<invalid>";
  155. printf("%2d %x:%-12s %010llx %010llx %010llx ", upto,
  156. desc->type, name, desc->physical_start,
  157. desc->virtual_start, size);
  158. if (desc->attribute & EFI_MEMORY_RUNTIME)
  159. putc('r');
  160. printf("%llx", desc->attribute & ~EFI_MEMORY_RUNTIME);
  161. putc('\n');
  162. for (i = 0; i < attr_seen_count; i++) {
  163. if (attr_seen[i] == desc->attribute)
  164. break;
  165. }
  166. if (i == attr_seen_count && i < ATTR_SEEN_MAX)
  167. attr_seen[attr_seen_count++] = desc->attribute;
  168. addr = desc->physical_start + size;
  169. }
  170. printf("\nAttributes key:\n");
  171. for (i = 0; i < attr_seen_count; i++) {
  172. u64 attr = attr_seen[i];
  173. bool first;
  174. int j;
  175. printf("%c%llx: ", (attr & EFI_MEMORY_RUNTIME) ? 'r' : ' ',
  176. attr & ~EFI_MEMORY_RUNTIME);
  177. for (j = 0, first = true; j < ARRAY_SIZE(mem_attr); j++) {
  178. if (attr & mem_attr[j].val) {
  179. if (first)
  180. first = false;
  181. else
  182. printf(", ");
  183. printf("%s", mem_attr[j].name);
  184. }
  185. }
  186. putc('\n');
  187. }
  188. if (skip_bs)
  189. printf("*Some areas are merged (use 'all' to see)\n");
  190. }
  191. static int do_efi_mem(struct cmd_tbl *cmdtp, int flag, int argc,
  192. char *const argv[])
  193. {
  194. struct efi_mem_desc *desc;
  195. struct efi_entry_memmap *map;
  196. int size, ret;
  197. bool skip_bs;
  198. skip_bs = !argc || *argv[0] != 'a';
  199. ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
  200. switch (ret) {
  201. case -ENOENT:
  202. printf("No EFI table available\n");
  203. goto done;
  204. case -EPROTONOSUPPORT:
  205. printf("Incorrect EFI table version\n");
  206. goto done;
  207. }
  208. printf("EFI table at %lx, memory map %p, size %x, version %x, descr. size %#x\n",
  209. gd->arch.table, map, size, map->version, map->desc_size);
  210. if (map->version != EFI_MEM_DESC_VERSION) {
  211. printf("Incorrect memory map version\n");
  212. ret = -EPROTONOSUPPORT;
  213. goto done;
  214. }
  215. desc = efi_build_mem_table(map, size, skip_bs);
  216. if (!desc) {
  217. ret = -ENOMEM;
  218. goto done;
  219. }
  220. efi_print_mem_table(map, desc, skip_bs);
  221. free(desc);
  222. done:
  223. if (ret)
  224. printf("Error: %d\n", ret);
  225. return ret ? CMD_RET_FAILURE : 0;
  226. }
  227. static struct cmd_tbl efi_commands[] = {
  228. U_BOOT_CMD_MKENT(mem, 1, 1, do_efi_mem, "", ""),
  229. };
  230. static int do_efi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  231. {
  232. struct cmd_tbl *efi_cmd;
  233. int ret;
  234. if (argc < 2)
  235. return CMD_RET_USAGE;
  236. efi_cmd = find_cmd_tbl(argv[1], efi_commands, ARRAY_SIZE(efi_commands));
  237. argc -= 2;
  238. argv += 2;
  239. if (!efi_cmd || argc > efi_cmd->maxargs)
  240. return CMD_RET_USAGE;
  241. ret = efi_cmd->cmd(efi_cmd, flag, argc, argv);
  242. return cmd_process_error(efi_cmd, ret);
  243. }
  244. U_BOOT_CMD(
  245. efi, 3, 1, do_efi,
  246. "EFI access",
  247. "mem [all] Dump memory information [include boot services]"
  248. );