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