efi.c 7.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302
  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. DECLARE_GLOBAL_DATA_PTR;
  15. static const char *const type_name[] = {
  16. "reserved",
  17. "loader_code",
  18. "loader_data",
  19. "bs_code",
  20. "bs_data",
  21. "rt_code",
  22. "rt_data",
  23. "conv",
  24. "unusable",
  25. "acpi_reclaim",
  26. "acpi_nvs",
  27. "io",
  28. "io_port",
  29. "pal_code",
  30. };
  31. static struct attr_info {
  32. u64 val;
  33. const char *name;
  34. } mem_attr[] = {
  35. { EFI_MEMORY_UC, "uncached" },
  36. { EFI_MEMORY_WC, "write-coalescing" },
  37. { EFI_MEMORY_WT, "write-through" },
  38. { EFI_MEMORY_WB, "write-back" },
  39. { EFI_MEMORY_UCE, "uncached & exported" },
  40. { EFI_MEMORY_WP, "write-protect" },
  41. { EFI_MEMORY_RP, "read-protect" },
  42. { EFI_MEMORY_XP, "execute-protect" },
  43. { EFI_MEMORY_NV, "non-volatile" },
  44. { EFI_MEMORY_MORE_RELIABLE, "higher reliability" },
  45. { EFI_MEMORY_RO, "read-only" },
  46. { EFI_MEMORY_SP, "specific purpose" },
  47. { EFI_MEMORY_RUNTIME, "needs runtime mapping" }
  48. };
  49. /* Maximum different attribute values we can track */
  50. #define ATTR_SEEN_MAX 30
  51. static inline bool is_boot_services(int type)
  52. {
  53. return type == EFI_LOADER_CODE || type == EFI_LOADER_DATA ||
  54. type == EFI_BOOT_SERVICES_CODE ||
  55. type == EFI_BOOT_SERVICES_DATA;
  56. }
  57. static int h_cmp_entry(const void *v1, const void *v2)
  58. {
  59. const struct efi_mem_desc *desc1 = v1;
  60. const struct efi_mem_desc *desc2 = v2;
  61. int64_t diff = desc1->physical_start - desc2->physical_start;
  62. /*
  63. * Manually calculate the difference to avoid sign loss in the 64-bit
  64. * to 32-bit conversion
  65. */
  66. return diff < 0 ? -1 : diff > 0 ? 1 : 0;
  67. }
  68. /**
  69. * efi_build_mem_table() - make a sorted copy of the memory table
  70. *
  71. * @desc_base: Pointer to EFI memory map table
  72. * @size: Size of table in bytes
  73. * @desc_size: Size of each @desc_base record
  74. * @skip_bs: True to skip boot-time memory and merge it with conventional
  75. * memory. This will significantly reduce the number of table
  76. * entries.
  77. * Return: pointer to the new table. It should be freed with free() by the
  78. * caller.
  79. */
  80. static void *efi_build_mem_table(struct efi_mem_desc *desc_base, int size,
  81. int desc_size, bool skip_bs)
  82. {
  83. struct efi_mem_desc *desc, *end, *base, *dest, *prev;
  84. int count;
  85. u64 addr;
  86. base = malloc(size + sizeof(*desc));
  87. if (!base) {
  88. debug("%s: Cannot allocate %#x bytes\n", __func__, size);
  89. return NULL;
  90. }
  91. end = (void *)desc_base + size;
  92. count = ((ulong)end - (ulong)desc_base) / desc_size;
  93. memcpy(base, desc_base, (ulong)end - (ulong)desc_base);
  94. qsort(base, count, desc_size, h_cmp_entry);
  95. prev = NULL;
  96. addr = 0;
  97. dest = base;
  98. end = (struct efi_mem_desc *)((ulong)base + count * desc_size);
  99. for (desc = base; desc < end;
  100. desc = efi_get_next_mem_desc(desc, desc_size)) {
  101. bool merge = true;
  102. u32 type = desc->type;
  103. if (type >= EFI_MAX_MEMORY_TYPE) {
  104. printf("Memory map contains invalid entry type %u\n",
  105. type);
  106. continue;
  107. }
  108. if (skip_bs && is_boot_services(desc->type))
  109. type = EFI_CONVENTIONAL_MEMORY;
  110. memcpy(dest, desc, desc_size);
  111. dest->type = type;
  112. if (!skip_bs || !prev)
  113. merge = false;
  114. else if (desc->physical_start != addr)
  115. merge = false;
  116. else if (type != EFI_CONVENTIONAL_MEMORY)
  117. merge = false;
  118. else if (prev->type != EFI_CONVENTIONAL_MEMORY)
  119. merge = false;
  120. if (merge) {
  121. prev->num_pages += desc->num_pages;
  122. } else {
  123. prev = dest;
  124. dest = efi_get_next_mem_desc(dest, desc_size);
  125. }
  126. addr = desc->physical_start + (desc->num_pages <<
  127. EFI_PAGE_SHIFT);
  128. }
  129. /* Mark the end */
  130. dest->type = EFI_MAX_MEMORY_TYPE;
  131. return base;
  132. }
  133. static void efi_print_mem_table(struct efi_mem_desc *desc, int desc_size,
  134. bool skip_bs)
  135. {
  136. u64 attr_seen[ATTR_SEEN_MAX];
  137. int attr_seen_count;
  138. int upto, i;
  139. u64 addr;
  140. printf(" # %-14s %10s %10s %10s %s\n", "Type", "Physical",
  141. "Virtual", "Size", "Attributes");
  142. /* Keep track of all the different attributes we have seen */
  143. attr_seen_count = 0;
  144. addr = 0;
  145. for (upto = 0; desc->type != EFI_MAX_MEMORY_TYPE;
  146. upto++, desc = efi_get_next_mem_desc(desc, desc_size)) {
  147. const char *name;
  148. u64 size;
  149. if (skip_bs && is_boot_services(desc->type))
  150. continue;
  151. if (desc->physical_start != addr) {
  152. printf(" %-14s %010llx %10s %010llx\n", "<gap>",
  153. addr, "", desc->physical_start - addr);
  154. }
  155. size = desc->num_pages << EFI_PAGE_SHIFT;
  156. name = desc->type < ARRAY_SIZE(type_name) ?
  157. type_name[desc->type] : "<invalid>";
  158. printf("%2d %x:%-12s %010llx %010llx %010llx ", upto,
  159. desc->type, name, desc->physical_start,
  160. desc->virtual_start, size);
  161. if (desc->attribute & EFI_MEMORY_RUNTIME)
  162. putc('r');
  163. printf("%llx", desc->attribute & ~EFI_MEMORY_RUNTIME);
  164. putc('\n');
  165. for (i = 0; i < attr_seen_count; i++) {
  166. if (attr_seen[i] == desc->attribute)
  167. break;
  168. }
  169. if (i == attr_seen_count && i < ATTR_SEEN_MAX)
  170. attr_seen[attr_seen_count++] = desc->attribute;
  171. addr = desc->physical_start + size;
  172. }
  173. printf("\nAttributes key:\n");
  174. for (i = 0; i < attr_seen_count; i++) {
  175. u64 attr = attr_seen[i];
  176. bool first;
  177. int j;
  178. printf("%c%llx: ", (attr & EFI_MEMORY_RUNTIME) ? 'r' : ' ',
  179. attr & ~EFI_MEMORY_RUNTIME);
  180. for (j = 0, first = true; j < ARRAY_SIZE(mem_attr); j++) {
  181. if (attr & mem_attr[j].val) {
  182. if (first)
  183. first = false;
  184. else
  185. printf(", ");
  186. printf("%s", mem_attr[j].name);
  187. }
  188. }
  189. putc('\n');
  190. }
  191. if (skip_bs)
  192. printf("*Some areas are merged (use 'all' to see)\n");
  193. }
  194. static int do_efi_mem(struct cmd_tbl *cmdtp, int flag, int argc,
  195. char *const argv[])
  196. {
  197. struct efi_mem_desc *orig, *desc;
  198. uint version, key;
  199. int desc_size;
  200. int size, ret;
  201. bool skip_bs;
  202. skip_bs = !argc || *argv[0] != 'a';
  203. if (IS_ENABLED(CONFIG_EFI_APP)) {
  204. ret = efi_get_mmap(&orig, &size, &key, &desc_size, &version);
  205. if (ret) {
  206. printf("Cannot read memory map (err=%d)\n", ret);
  207. return CMD_RET_FAILURE;
  208. }
  209. } else {
  210. struct efi_entry_memmap *map;
  211. ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
  212. switch (ret) {
  213. case -ENOENT:
  214. printf("No EFI table available\n");
  215. goto done;
  216. case -EPROTONOSUPPORT:
  217. printf("Incorrect EFI table version\n");
  218. goto done;
  219. }
  220. orig = map->desc;
  221. desc_size = map->desc_size;
  222. version = map->version;
  223. }
  224. printf("EFI table at %lx, memory map %p, size %x, key %x, version %x, descr. size %#x\n",
  225. gd->arch.table, orig, size, key, version, desc_size);
  226. if (version != EFI_MEM_DESC_VERSION) {
  227. printf("Incorrect memory map version\n");
  228. ret = -EPROTONOSUPPORT;
  229. goto done;
  230. }
  231. desc = efi_build_mem_table(orig, size, desc_size, skip_bs);
  232. if (!desc) {
  233. ret = -ENOMEM;
  234. goto done;
  235. }
  236. efi_print_mem_table(desc, desc_size, skip_bs);
  237. free(desc);
  238. if (IS_ENABLED(CONFIG_EFI_APP))
  239. free(orig);
  240. done:
  241. if (ret)
  242. printf("Error: %d\n", ret);
  243. return ret ? CMD_RET_FAILURE : 0;
  244. }
  245. static struct cmd_tbl efi_commands[] = {
  246. U_BOOT_CMD_MKENT(mem, 1, 1, do_efi_mem, "", ""),
  247. };
  248. static int do_efi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  249. {
  250. struct cmd_tbl *efi_cmd;
  251. int ret;
  252. if (argc < 2)
  253. return CMD_RET_USAGE;
  254. efi_cmd = find_cmd_tbl(argv[1], efi_commands, ARRAY_SIZE(efi_commands));
  255. argc -= 2;
  256. argv += 2;
  257. if (!efi_cmd || argc > efi_cmd->maxargs)
  258. return CMD_RET_USAGE;
  259. ret = efi_cmd->cmd(efi_cmd, flag, argc, argv);
  260. return cmd_process_error(efi_cmd, ret);
  261. }
  262. U_BOOT_CMD(
  263. efi, 3, 1, do_efi,
  264. "EFI access",
  265. "mem [all] Dump memory information [include boot services]"
  266. );