common/cmd_tpm.c

   1 /*
   2  * Copyright (c) 2013 The Chromium OS Authors.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <command.h>
   9 #include <dm.h>
  10 #include <malloc.h>
  11 #include <tpm.h>
  12 #include <asm/unaligned.h>
  13 #include <linux/string.h>
  14
  15 /* Useful constants */
  16 enum {
  17         DIGEST_LENGTH           = 20,
  18         /* max lengths, valid for RSA keys <= 2048 bits */
  19         TPM_PUBKEY_MAX_LENGTH   = 288,
  20 };
  21
  22 /**
  23  * Print a byte string in hexdecimal format, 16-bytes per line.
  24  *
  25  * @param data          byte string to be printed
  26  * @param count         number of bytes to be printed
  27  */
  28 static void print_byte_string(uint8_t *data, size_t count)
  29 {
  30         int i, print_newline = 0;
  31
  32         for (i = 0; i < count; i++) {
  33                 printf(" %02x", data[i]);
  34                 print_newline = (i % 16 == 15);
  35                 if (print_newline)
  36                         putc('\n');
  37         }
  38         /* Avoid duplicated newline at the end */
  39         if (!print_newline)
  40                 putc('\n');
  41 }
  42
  43 /**
  44  * Convert a text string of hexdecimal values into a byte string.
  45  *
  46  * @param bytes         text string of hexdecimal values with no space
  47  *                      between them
  48  * @param data          output buffer for byte string.  The caller has to make
  49  *                      sure it is large enough for storing the output.  If
  50  *                      NULL is passed, a large enough buffer will be allocated,
  51  *                      and the caller must free it.
  52  * @param count_ptr     output variable for the length of byte string
  53  * @return pointer to output buffer
  54  */
  55 static void *parse_byte_string(char *bytes, uint8_t *data, size_t *count_ptr)
  56 {
  57         char byte[3];
  58         size_t count, length;
  59         int i;
  60
  61         if (!bytes)
  62                 return NULL;
  63         length = strlen(bytes);
  64         count = length / 2;
  65
  66         if (!data)
  67                 data = malloc(count);
  68         if (!data)
  69                 return NULL;
  70
  71         byte[2] = '\0';
  72         for (i = 0; i < length; i += 2) {
  73                 byte[0] = bytes[i];
  74                 byte[1] = bytes[i + 1];
  75                 data[i / 2] = (uint8_t)simple_strtoul(byte, NULL, 16);
  76         }
  77
  78         if (count_ptr)
  79                 *count_ptr = count;
  80
  81         return data;
  82 }
  83
  84 /**
  85  * report_return_code() - Report any error and return failure or success
  86  *
  87  * @param return_code   TPM command return code
  88  * @return value of enum command_ret_t
  89  */
  90 static int report_return_code(int return_code)
  91 {
  92         if (return_code) {
  93                 printf("Error: %d\n", return_code);
  94                 return CMD_RET_FAILURE;
  95         } else {
  96                 return CMD_RET_SUCCESS;
  97         }
  98 }
  99
 100 /**
 101  * Return number of values defined by a type string.
 102  *
 103  * @param type_str      type string
 104  * @return number of values of type string
 105  */
 106 static int type_string_get_num_values(const char *type_str)
 107 {
 108         return strlen(type_str);
 109 }
 110
 111 /**
 112  * Return total size of values defined by a type string.
 113  *
 114  * @param type_str      type string
 115  * @return total size of values of type string, or 0 if type string
 116  *  contains illegal type character.
 117  */
 118 static size_t type_string_get_space_size(const char *type_str)
 119 {
 120         size_t size;
 121
 122         for (size = 0; *type_str; type_str++) {
 123                 switch (*type_str) {
 124                 case 'b':
 125                         size += 1;
 126                         break;
 127                 case 'w':
 128                         size += 2;
 129                         break;
 130                 case 'd':
 131                         size += 4;
 132                         break;
 133                 default:
 134                         return 0;
 135                 }
 136         }
 137
 138         return size;
 139 }
 140
 141 /**
 142  * Allocate a buffer large enough to hold values defined by a type
 143  * string.  The caller has to free the buffer.
 144  *
 145  * @param type_str      type string
 146  * @param count         pointer for storing size of buffer
 147  * @return pointer to buffer or NULL on error
 148  */
 149 static void *type_string_alloc(const char *type_str, uint32_t *count)
 150 {
 151         void *data;
 152         size_t size;
 153
 154         size = type_string_get_space_size(type_str);
 155         if (!size)
 156                 return NULL;
 157         data = malloc(size);
 158         if (data)
 159                 *count = size;
 160
 161         return data;
 162 }
 163
 164 /**
 165  * Pack values defined by a type string into a buffer.  The buffer must have
 166  * large enough space.
 167  *
 168  * @param type_str      type string
 169  * @param values        text strings of values to be packed
 170  * @param data          output buffer of values
 171  * @return 0 on success, non-0 on error
 172  */
 173 static int type_string_pack(const char *type_str, char * const values[],
 174                 uint8_t *data)
 175 {
 176         size_t offset;
 177         uint32_t value;
 178
 179         for (offset = 0; *type_str; type_str++, values++) {
 180                 value = simple_strtoul(values[0], NULL, 0);
 181                 switch (*type_str) {
 182                 case 'b':
 183                         data[offset] = value;
 184                         offset += 1;
 185                         break;
 186                 case 'w':
 187                         put_unaligned_be16(value, data + offset);
 188                         offset += 2;
 189                         break;
 190                 case 'd':
 191                         put_unaligned_be32(value, data + offset);
 192                         offset += 4;
 193                         break;
 194                 default:
 195                         return -1;
 196                 }
 197         }
 198
 199         return 0;
 200 }
 201
 202 /**
 203  * Read values defined by a type string from a buffer, and write these values
 204  * to environment variables.
 205  *
 206  * @param type_str      type string
 207  * @param data          input buffer of values
 208  * @param vars          names of environment variables
 209  * @return 0 on success, non-0 on error
 210  */
 211 static int type_string_write_vars(const char *type_str, uint8_t *data,
 212                 char * const vars[])
 213 {
 214         size_t offset;
 215         uint32_t value;
 216
 217         for (offset = 0; *type_str; type_str++, vars++) {
 218                 switch (*type_str) {
 219                 case 'b':
 220                         value = data[offset];
 221                         offset += 1;
 222                         break;
 223                 case 'w':
 224                         value = get_unaligned_be16(data + offset);
 225                         offset += 2;
 226                         break;
 227                 case 'd':
 228                         value = get_unaligned_be32(data + offset);
 229                         offset += 4;
 230                         break;
 231                 default:
 232                         return -1;
 233                 }
 234                 if (setenv_ulong(*vars, value))
 235                         return -1;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static int do_tpm_startup(cmd_tbl_t *cmdtp, int flag,
 242                 int argc, char * const argv[])
 243 {
 244         enum tpm_startup_type mode;
 245
 246         if (argc != 2)
 247                 return CMD_RET_USAGE;
 248         if (!strcasecmp("TPM_ST_CLEAR", argv[1])) {
 249                 mode = TPM_ST_CLEAR;
 250         } else if (!strcasecmp("TPM_ST_STATE", argv[1])) {
 251                 mode = TPM_ST_STATE;
 252         } else if (!strcasecmp("TPM_ST_DEACTIVATED", argv[1])) {
 253                 mode = TPM_ST_DEACTIVATED;
 254         } else {
 255                 printf("Couldn't recognize mode string: %s\n", argv[1]);
 256                 return CMD_RET_FAILURE;
 257         }
 258
 259         return report_return_code(tpm_startup(mode));
 260 }
 261
 262 static int do_tpm_nv_define_space(cmd_tbl_t *cmdtp, int flag,
 263                 int argc, char * const argv[])
 264 {
 265         uint32_t index, perm, size;
 266
 267         if (argc != 4)
 268                 return CMD_RET_USAGE;
 269         index = simple_strtoul(argv[1], NULL, 0);
 270         perm = simple_strtoul(argv[2], NULL, 0);
 271         size = simple_strtoul(argv[3], NULL, 0);
 272
 273         return report_return_code(tpm_nv_define_space(index, perm, size));
 274 }
 275
 276 static int do_tpm_nv_read_value(cmd_tbl_t *cmdtp, int flag,
 277                 int argc, char * const argv[])
 278 {
 279         uint32_t index, count, rc;
 280         void *data;
 281
 282         if (argc != 4)
 283                 return CMD_RET_USAGE;
 284         index = simple_strtoul(argv[1], NULL, 0);
 285         data = (void *)simple_strtoul(argv[2], NULL, 0);
 286         count = simple_strtoul(argv[3], NULL, 0);
 287
 288         rc = tpm_nv_read_value(index, data, count);
 289         if (!rc) {
 290                 puts("area content:\n");
 291                 print_byte_string(data, count);
 292         }
 293
 294         return report_return_code(rc);
 295 }
 296
 297 static int do_tpm_nv_write_value(cmd_tbl_t *cmdtp, int flag,
 298                 int argc, char * const argv[])
 299 {
 300         uint32_t index, rc;
 301         size_t count;
 302         void *data;
 303
 304         if (argc != 3)
 305                 return CMD_RET_USAGE;
 306         index = simple_strtoul(argv[1], NULL, 0);
 307         data = parse_byte_string(argv[2], NULL, &count);
 308         if (!data) {
 309                 printf("Couldn't parse byte string %s\n", argv[2]);
 310                 return CMD_RET_FAILURE;
 311         }
 312
 313         rc = tpm_nv_write_value(index, data, count);
 314         free(data);
 315
 316         return report_return_code(rc);
 317 }
 318
 319 static int do_tpm_extend(cmd_tbl_t *cmdtp, int flag,
 320                 int argc, char * const argv[])
 321 {
 322         uint32_t index, rc;
 323         uint8_t in_digest[20], out_digest[20];
 324
 325         if (argc != 3)
 326                 return CMD_RET_USAGE;
 327         index = simple_strtoul(argv[1], NULL, 0);
 328         if (!parse_byte_string(argv[2], in_digest, NULL)) {
 329                 printf("Couldn't parse byte string %s\n", argv[2]);
 330                 return CMD_RET_FAILURE;
 331         }
 332
 333         rc = tpm_extend(index, in_digest, out_digest);
 334         if (!rc) {
 335                 puts("PCR value after execution of the command:\n");
 336                 print_byte_string(out_digest, sizeof(out_digest));
 337         }
 338
 339         return report_return_code(rc);
 340 }
 341
 342 static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag,
 343                 int argc, char * const argv[])
 344 {
 345         uint32_t index, count, rc;
 346         void *data;
 347
 348         if (argc != 4)
 349                 return CMD_RET_USAGE;
 350         index = simple_strtoul(argv[1], NULL, 0);
 351         data = (void *)simple_strtoul(argv[2], NULL, 0);
 352         count = simple_strtoul(argv[3], NULL, 0);
 353
 354         rc = tpm_pcr_read(index, data, count);
 355         if (!rc) {
 356                 puts("Named PCR content:\n");
 357                 print_byte_string(data, count);
 358         }
 359
 360         return report_return_code(rc);
 361 }
 362
 363 static int do_tpm_tsc_physical_presence(cmd_tbl_t *cmdtp, int flag,
 364                 int argc, char * const argv[])
 365 {
 366         uint16_t presence;
 367
 368         if (argc != 2)
 369                 return CMD_RET_USAGE;
 370         presence = (uint16_t)simple_strtoul(argv[1], NULL, 0);
 371
 372         return report_return_code(tpm_tsc_physical_presence(presence));
 373 }
 374
 375 static int do_tpm_read_pubek(cmd_tbl_t *cmdtp, int flag,
 376                 int argc, char * const argv[])
 377 {
 378         uint32_t count, rc;
 379         void *data;
 380
 381         if (argc != 3)
 382                 return CMD_RET_USAGE;
 383         data = (void *)simple_strtoul(argv[1], NULL, 0);
 384         count = simple_strtoul(argv[2], NULL, 0);
 385
 386         rc = tpm_read_pubek(data, count);
 387         if (!rc) {
 388                 puts("pubek value:\n");
 389                 print_byte_string(data, count);
 390         }
 391
 392         return report_return_code(rc);
 393 }
 394
 395 static int do_tpm_physical_set_deactivated(cmd_tbl_t *cmdtp, int flag,
 396                 int argc, char * const argv[])
 397 {
 398         uint8_t state;
 399
 400         if (argc != 2)
 401                 return CMD_RET_USAGE;
 402         state = (uint8_t)simple_strtoul(argv[1], NULL, 0);
 403
 404         return report_return_code(tpm_physical_set_deactivated(state));
 405 }
 406
 407 static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag,
 408                 int argc, char * const argv[])
 409 {
 410         uint32_t cap_area, sub_cap, rc;
 411         void *cap;
 412         size_t count;
 413
 414         if (argc != 5)
 415                 return CMD_RET_USAGE;
 416         cap_area = simple_strtoul(argv[1], NULL, 0);
 417         sub_cap = simple_strtoul(argv[2], NULL, 0);
 418         cap = (void *)simple_strtoul(argv[3], NULL, 0);
 419         count = simple_strtoul(argv[4], NULL, 0);
 420
 421         rc = tpm_get_capability(cap_area, sub_cap, cap, count);
 422         if (!rc) {
 423                 puts("capability information:\n");
 424                 print_byte_string(cap, count);
 425         }
 426
 427         return report_return_code(rc);
 428 }
 429
 430 #define TPM_COMMAND_NO_ARG(cmd)                         \
 431 static int do_##cmd(cmd_tbl_t *cmdtp, int flag,         \
 432                 int argc, char * const argv[])          \
 433 {                                                       \
 434         if (argc != 1)                                  \
 435                 return CMD_RET_USAGE;                   \
 436         return report_return_code(cmd());               \
 437 }
 438
 439 TPM_COMMAND_NO_ARG(tpm_init)
 440 TPM_COMMAND_NO_ARG(tpm_self_test_full)
 441 TPM_COMMAND_NO_ARG(tpm_continue_self_test)
 442 TPM_COMMAND_NO_ARG(tpm_force_clear)
 443 TPM_COMMAND_NO_ARG(tpm_physical_enable)
 444 TPM_COMMAND_NO_ARG(tpm_physical_disable)
 445
 446 #ifdef CONFIG_DM_TPM
 447 static int get_tpm(struct udevice **devp)
 448 {
 449         int rc;
 450
 451         rc = uclass_first_device(UCLASS_TPM, devp);
 452         if (rc) {
 453                 printf("Could not find TPM (ret=%d)\n", rc);
 454                 return CMD_RET_FAILURE;
 455         }
 456
 457         return 0;
 458 }
 459 #endif
 460
 461 static int do_tpm_raw_transfer(cmd_tbl_t *cmdtp, int flag,
 462                 int argc, char * const argv[])
 463 {
 464         void *command;
 465         uint8_t response[1024];
 466         size_t count, response_length = sizeof(response);
 467         uint32_t rc;
 468
 469         command = parse_byte_string(argv[1], NULL, &count);
 470         if (!command) {
 471                 printf("Couldn't parse byte string %s\n", argv[1]);
 472                 return CMD_RET_FAILURE;
 473         }
 474
 475 #ifdef CONFIG_DM_TPM
 476         struct udevice *dev;
 477
 478         rc = get_tpm(&dev);
 479         if (rc)
 480                 return rc;
 481
 482         rc = tpm_xfer(dev, command, count, response, &response_length);
 483 #else
 484         rc = tis_sendrecv(command, count, response, &response_length);
 485 #endif
 486         free(command);
 487         if (!rc) {
 488                 puts("tpm response:\n");
 489                 print_byte_string(response, response_length);
 490         }
 491
 492         return report_return_code(rc);
 493 }
 494
 495 static int do_tpm_nv_define(cmd_tbl_t *cmdtp, int flag,
 496                 int argc, char * const argv[])
 497 {
 498         uint32_t index, perm, size;
 499
 500         if (argc != 4)
 501                 return CMD_RET_USAGE;
 502         size = type_string_get_space_size(argv[1]);
 503         if (!size) {
 504                 printf("Couldn't parse arguments\n");
 505                 return CMD_RET_USAGE;
 506         }
 507         index = simple_strtoul(argv[2], NULL, 0);
 508         perm = simple_strtoul(argv[3], NULL, 0);
 509
 510         return report_return_code(tpm_nv_define_space(index, perm, size));
 511 }
 512
 513 static int do_tpm_nv_read(cmd_tbl_t *cmdtp, int flag,
 514                 int argc, char * const argv[])
 515 {
 516         uint32_t index, count, err;
 517         void *data;
 518
 519         if (argc < 3)
 520                 return CMD_RET_USAGE;
 521         if (argc != 3 + type_string_get_num_values(argv[1]))
 522                 return CMD_RET_USAGE;
 523         index = simple_strtoul(argv[2], NULL, 0);
 524         data = type_string_alloc(argv[1], &count);
 525         if (!data) {
 526                 printf("Couldn't parse arguments\n");
 527                 return CMD_RET_USAGE;
 528         }
 529
 530         err = tpm_nv_read_value(index, data, count);
 531         if (!err) {
 532                 if (type_string_write_vars(argv[1], data, argv + 3)) {
 533                         printf("Couldn't write to variables\n");
 534                         err = ~0;
 535                 }
 536         }
 537         free(data);
 538
 539         return report_return_code(err);
 540 }
 541
 542 static int do_tpm_nv_write(cmd_tbl_t *cmdtp, int flag,
 543                 int argc, char * const argv[])
 544 {
 545         uint32_t index, count, err;
 546         void *data;
 547
 548         if (argc < 3)
 549                 return CMD_RET_USAGE;
 550         if (argc != 3 + type_string_get_num_values(argv[1]))
 551                 return CMD_RET_USAGE;
 552         index = simple_strtoul(argv[2], NULL, 0);
 553         data = type_string_alloc(argv[1], &count);
 554         if (!data) {
 555                 printf("Couldn't parse arguments\n");
 556                 return CMD_RET_USAGE;
 557         }
 558         if (type_string_pack(argv[1], argv + 3, data)) {
 559                 printf("Couldn't parse arguments\n");
 560                 free(data);
 561                 return CMD_RET_USAGE;
 562         }
 563
 564         err = tpm_nv_write_value(index, data, count);
 565         free(data);
 566
 567         return report_return_code(err);
 568 }
 569
 570 #ifdef CONFIG_TPM_AUTH_SESSIONS
 571
 572 static int do_tpm_oiap(cmd_tbl_t *cmdtp, int flag,
 573                 int argc, char * const argv[])
 574 {
 575         uint32_t auth_handle, err;
 576
 577         err = tpm_oiap(&auth_handle);
 578
 579         return report_return_code(err);
 580 }
 581
 582 static int do_tpm_load_key2_oiap(cmd_tbl_t *cmdtp, int flag,
 583                 int argc, char * const argv[])
 584 {
 585         uint32_t parent_handle, key_len, key_handle, err;
 586         uint8_t usage_auth[DIGEST_LENGTH];
 587         void *key;
 588
 589         if (argc < 5)
 590                 return CMD_RET_USAGE;
 591
 592         parent_handle = simple_strtoul(argv[1], NULL, 0);
 593         key = (void *)simple_strtoul(argv[2], NULL, 0);
 594         key_len = simple_strtoul(argv[3], NULL, 0);
 595         if (strlen(argv[4]) != 2 * DIGEST_LENGTH)
 596                 return CMD_RET_FAILURE;
 597         parse_byte_string(argv[4], usage_auth, NULL);
 598
 599         err = tpm_load_key2_oiap(parent_handle, key, key_len, usage_auth,
 600                         &key_handle);
 601         if (!err)
 602                 printf("Key handle is 0x%x\n", key_handle);
 603
 604         return report_return_code(err);
 605 }
 606
 607 static int do_tpm_get_pub_key_oiap(cmd_tbl_t *cmdtp, int flag,
 608                 int argc, char * const argv[])
 609 {
 610         uint32_t key_handle, err;
 611         uint8_t usage_auth[DIGEST_LENGTH];
 612         uint8_t pub_key_buffer[TPM_PUBKEY_MAX_LENGTH];
 613         size_t pub_key_len = sizeof(pub_key_buffer);
 614
 615         if (argc < 3)
 616                 return CMD_RET_USAGE;
 617
 618         key_handle = simple_strtoul(argv[1], NULL, 0);
 619         if (strlen(argv[2]) != 2 * DIGEST_LENGTH)
 620                 return CMD_RET_FAILURE;
 621         parse_byte_string(argv[2], usage_auth, NULL);
 622
 623         err = tpm_get_pub_key_oiap(key_handle, usage_auth,
 624                         pub_key_buffer, &pub_key_len);
 625         if (!err) {
 626                 printf("dump of received pub key structure:\n");
 627                 print_byte_string(pub_key_buffer, pub_key_len);
 628         }
 629         return report_return_code(err);
 630 }
 631
 632 TPM_COMMAND_NO_ARG(tpm_end_oiap)
 633
 634 #endif /* CONFIG_TPM_AUTH_SESSIONS */
 635
 636 #define MAKE_TPM_CMD_ENTRY(cmd) \
 637         U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "")
 638
 639 static cmd_tbl_t tpm_commands[] = {
 640         U_BOOT_CMD_MKENT(init, 0, 1,
 641                         do_tpm_init, "", ""),
 642         U_BOOT_CMD_MKENT(startup, 0, 1,
 643                         do_tpm_startup, "", ""),
 644         U_BOOT_CMD_MKENT(self_test_full, 0, 1,
 645                         do_tpm_self_test_full, "", ""),
 646         U_BOOT_CMD_MKENT(continue_self_test, 0, 1,
 647                         do_tpm_continue_self_test, "", ""),
 648         U_BOOT_CMD_MKENT(force_clear, 0, 1,
 649                         do_tpm_force_clear, "", ""),
 650         U_BOOT_CMD_MKENT(physical_enable, 0, 1,
 651                         do_tpm_physical_enable, "", ""),
 652         U_BOOT_CMD_MKENT(physical_disable, 0, 1,
 653                         do_tpm_physical_disable, "", ""),
 654         U_BOOT_CMD_MKENT(nv_define_space, 0, 1,
 655                         do_tpm_nv_define_space, "", ""),
 656         U_BOOT_CMD_MKENT(nv_read_value, 0, 1,
 657                         do_tpm_nv_read_value, "", ""),
 658         U_BOOT_CMD_MKENT(nv_write_value, 0, 1,
 659                         do_tpm_nv_write_value, "", ""),
 660         U_BOOT_CMD_MKENT(extend, 0, 1,
 661                         do_tpm_extend, "", ""),
 662         U_BOOT_CMD_MKENT(pcr_read, 0, 1,
 663                         do_tpm_pcr_read, "", ""),
 664         U_BOOT_CMD_MKENT(tsc_physical_presence, 0, 1,
 665                         do_tpm_tsc_physical_presence, "", ""),
 666         U_BOOT_CMD_MKENT(read_pubek, 0, 1,
 667                         do_tpm_read_pubek, "", ""),
 668         U_BOOT_CMD_MKENT(physical_set_deactivated, 0, 1,
 669                         do_tpm_physical_set_deactivated, "", ""),
 670         U_BOOT_CMD_MKENT(get_capability, 0, 1,
 671                         do_tpm_get_capability, "", ""),
 672         U_BOOT_CMD_MKENT(raw_transfer, 0, 1,
 673                         do_tpm_raw_transfer, "", ""),
 674         U_BOOT_CMD_MKENT(nv_define, 0, 1,
 675                         do_tpm_nv_define, "", ""),
 676         U_BOOT_CMD_MKENT(nv_read, 0, 1,
 677                         do_tpm_nv_read, "", ""),
 678         U_BOOT_CMD_MKENT(nv_write, 0, 1,
 679                         do_tpm_nv_write, "", ""),
 680 #ifdef CONFIG_TPM_AUTH_SESSIONS
 681         U_BOOT_CMD_MKENT(oiap, 0, 1,
 682                          do_tpm_oiap, "", ""),
 683         U_BOOT_CMD_MKENT(end_oiap, 0, 1,
 684                          do_tpm_end_oiap, "", ""),
 685         U_BOOT_CMD_MKENT(load_key2_oiap, 0, 1,
 686                          do_tpm_load_key2_oiap, "", ""),
 687         U_BOOT_CMD_MKENT(get_pub_key_oiap, 0, 1,
 688                          do_tpm_get_pub_key_oiap, "", ""),
 689 #endif /* CONFIG_TPM_AUTH_SESSIONS */
 690 };
 691
 692 static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 693 {
 694         cmd_tbl_t *tpm_cmd;
 695
 696         if (argc < 2)
 697                 return CMD_RET_USAGE;
 698         tpm_cmd = find_cmd_tbl(argv[1], tpm_commands, ARRAY_SIZE(tpm_commands));
 699         if (!tpm_cmd)
 700                 return CMD_RET_USAGE;
 701
 702         return tpm_cmd->cmd(cmdtp, flag, argc - 1, argv + 1);
 703 }
 704
 705 U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm,
 706 "Issue a TPM command",
 707 "cmd args...\n"
 708 "    - Issue TPM command <cmd> with arguments <args...>.\n"
 709 "Admin Startup and State Commands:\n"
 710 "  init\n"
 711 "    - Put TPM into a state where it waits for 'startup' command.\n"
 712 "  startup mode\n"
 713 "    - Issue TPM_Starup command.  <mode> is one of TPM_ST_CLEAR,\n"
 714 "      TPM_ST_STATE, and TPM_ST_DEACTIVATED.\n"
 715 "Admin Testing Commands:\n"
 716 "  self_test_full\n"
 717 "    - Test all of the TPM capabilities.\n"
 718 "  continue_self_test\n"
 719 "    - Inform TPM that it should complete the self-test.\n"
 720 "Admin Opt-in Commands:\n"
 721 "  physical_enable\n"
 722 "    - Set the PERMANENT disable flag to FALSE using physical presence as\n"
 723 "      authorization.\n"
 724 "  physical_disable\n"
 725 "    - Set the PERMANENT disable flag to TRUE using physical presence as\n"
 726 "      authorization.\n"
 727 "  physical_set_deactivated 0|1\n"
 728 "    - Set deactivated flag.\n"
 729 "Admin Ownership Commands:\n"
 730 "  force_clear\n"
 731 "    - Issue TPM_ForceClear command.\n"
 732 "  tsc_physical_presence flags\n"
 733 "    - Set TPM device's Physical Presence flags to <flags>.\n"
 734 "The Capability Commands:\n"
 735 "  get_capability cap_area sub_cap addr count\n"
 736 "    - Read <count> bytes of TPM capability indexed by <cap_area> and\n"
 737 "      <sub_cap> to memory address <addr>.\n"
 738 #ifdef CONFIG_TPM_AUTH_SESSIONS
 739 "Storage functions\n"
 740 "  loadkey2_oiap parent_handle key_addr key_len usage_auth\n"
 741 "    - loads a key data from memory address <key_addr>, <key_len> bytes\n"
 742 "      into TPM using the parent key <parent_handle> with authorization\n"
 743 "      <usage_auth> (20 bytes hex string).\n"
 744 "  get_pub_key_oiap key_handle usage_auth\n"
 745 "    - get the public key portion of a loaded key <key_handle> using\n"
 746 "      authorization <usage auth> (20 bytes hex string)\n"
 747 #endif /* CONFIG_TPM_AUTH_SESSIONS */
 748 "Endorsement Key Handling Commands:\n"
 749 "  read_pubek addr count\n"
 750 "    - Read <count> bytes of the public endorsement key to memory\n"
 751 "      address <addr>\n"
 752 "Integrity Collection and Reporting Commands:\n"
 753 "  extend index digest_hex_string\n"
 754 "    - Add a new measurement to a PCR.  Update PCR <index> with the 20-bytes\n"
 755 "      <digest_hex_string>\n"
 756 "  pcr_read index addr count\n"
 757 "    - Read <count> bytes from PCR <index> to memory address <addr>.\n"
 758 #ifdef CONFIG_TPM_AUTH_SESSIONS
 759 "Authorization Sessions\n"
 760 "  oiap\n"
 761 "    - setup an OIAP session\n"
 762 "  end_oiap\n"
 763 "    - terminates an active OIAP session\n"
 764 #endif /* CONFIG_TPM_AUTH_SESSIONS */
 765 "Non-volatile Storage Commands:\n"
 766 "  nv_define_space index permission size\n"
 767 "    - Establish a space at index <index> with <permission> of <size> bytes.\n"
 768 "  nv_read_value index addr count\n"
 769 "    - Read <count> bytes from space <index> to memory address <addr>.\n"
 770 "  nv_write_value index addr count\n"
 771 "    - Write <count> bytes from memory address <addr> to space <index>.\n"
 772 "Miscellaneous helper functions:\n"
 773 "  raw_transfer byte_string\n"
 774 "    - Send a byte string <byte_string> to TPM and print the response.\n"
 775 " Non-volatile storage helper functions:\n"
 776 "    These helper functions treat a non-volatile space as a non-padded\n"
 777 "    sequence of integer values.  These integer values are defined by a type\n"
 778 "    string, which is a text string of 'bwd' characters: 'b' means a 8-bit\n"
 779 "    value, 'w' 16-bit value, 'd' 32-bit value.  All helper functions take\n"
 780 "    a type string as their first argument.\n"
 781 "  nv_define type_string index perm\n"
 782 "    - Define a space <index> with permission <perm>.\n"
 783 "  nv_read types_string index vars...\n"
 784 "    - Read from space <index> to environment variables <vars...>.\n"
 785 "  nv_write types_string index values...\n"
 786 "    - Write to space <index> from values <values...>.\n"
 787 );