1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013 The Chromium OS Authors.
8 #include <asm/unaligned.h>
9 #include <tpm-common.h>
11 #include "tpm-user-utils.h"
13 static int do_tpm_startup(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
16 enum tpm_startup_type mode
;
20 if (!strcasecmp("TPM_ST_CLEAR", argv
[1])) {
22 } else if (!strcasecmp("TPM_ST_STATE", argv
[1])) {
24 } else if (!strcasecmp("TPM_ST_DEACTIVATED", argv
[1])) {
25 mode
= TPM_ST_DEACTIVATED
;
27 printf("Couldn't recognize mode string: %s\n", argv
[1]);
28 return CMD_RET_FAILURE
;
31 return report_return_code(tpm_startup(mode
));
34 static int do_tpm_nv_define_space(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
37 u32 index
, perm
, size
;
41 index
= simple_strtoul(argv
[1], NULL
, 0);
42 perm
= simple_strtoul(argv
[2], NULL
, 0);
43 size
= simple_strtoul(argv
[3], NULL
, 0);
45 return report_return_code(tpm_nv_define_space(index
, perm
, size
));
48 static int do_tpm_nv_read_value(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
56 index
= simple_strtoul(argv
[1], NULL
, 0);
57 data
= (void *)simple_strtoul(argv
[2], NULL
, 0);
58 count
= simple_strtoul(argv
[3], NULL
, 0);
60 rc
= tpm_nv_read_value(index
, data
, count
);
62 puts("area content:\n");
63 print_byte_string(data
, count
);
66 return report_return_code(rc
);
69 static int do_tpm_nv_write_value(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
78 index
= simple_strtoul(argv
[1], NULL
, 0);
79 data
= parse_byte_string(argv
[2], NULL
, &count
);
81 printf("Couldn't parse byte string %s\n", argv
[2]);
82 return CMD_RET_FAILURE
;
85 rc
= tpm_nv_write_value(index
, data
, count
);
88 return report_return_code(rc
);
91 static int do_tpm_extend(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
95 u8 in_digest
[20], out_digest
[20];
99 index
= simple_strtoul(argv
[1], NULL
, 0);
100 if (!parse_byte_string(argv
[2], in_digest
, NULL
)) {
101 printf("Couldn't parse byte string %s\n", argv
[2]);
102 return CMD_RET_FAILURE
;
105 rc
= tpm_extend(index
, in_digest
, out_digest
);
107 puts("PCR value after execution of the command:\n");
108 print_byte_string(out_digest
, sizeof(out_digest
));
111 return report_return_code(rc
);
114 static int do_tpm_pcr_read(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
117 u32 index
, count
, rc
;
121 return CMD_RET_USAGE
;
122 index
= simple_strtoul(argv
[1], NULL
, 0);
123 data
= (void *)simple_strtoul(argv
[2], NULL
, 0);
124 count
= simple_strtoul(argv
[3], NULL
, 0);
126 rc
= tpm_pcr_read(index
, data
, count
);
128 puts("Named PCR content:\n");
129 print_byte_string(data
, count
);
132 return report_return_code(rc
);
135 static int do_tpm_tsc_physical_presence(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
141 return CMD_RET_USAGE
;
142 presence
= (u16
)simple_strtoul(argv
[1], NULL
, 0);
144 return report_return_code(tpm_tsc_physical_presence(presence
));
147 static int do_tpm_read_pubek(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
154 return CMD_RET_USAGE
;
155 data
= (void *)simple_strtoul(argv
[1], NULL
, 0);
156 count
= simple_strtoul(argv
[2], NULL
, 0);
158 rc
= tpm_read_pubek(data
, count
);
160 puts("pubek value:\n");
161 print_byte_string(data
, count
);
164 return report_return_code(rc
);
167 static int do_tpm_physical_set_deactivated(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
173 return CMD_RET_USAGE
;
174 state
= (u8
)simple_strtoul(argv
[1], NULL
, 0);
176 return report_return_code(tpm_physical_set_deactivated(state
));
179 static int do_tpm_get_capability(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
182 u32 cap_area
, sub_cap
, rc
;
187 return CMD_RET_USAGE
;
188 cap_area
= simple_strtoul(argv
[1], NULL
, 0);
189 sub_cap
= simple_strtoul(argv
[2], NULL
, 0);
190 cap
= (void *)simple_strtoul(argv
[3], NULL
, 0);
191 count
= simple_strtoul(argv
[4], NULL
, 0);
193 rc
= tpm_get_capability(cap_area
, sub_cap
, cap
, count
);
195 puts("capability information:\n");
196 print_byte_string(cap
, count
);
199 return report_return_code(rc
);
202 static int do_tpm_raw_transfer(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
208 size_t count
, response_length
= sizeof(response
);
211 command
= parse_byte_string(argv
[1], NULL
, &count
);
213 printf("Couldn't parse byte string %s\n", argv
[1]);
214 return CMD_RET_FAILURE
;
221 rc
= tpm_xfer(dev
, command
, count
, response
, &response_length
);
224 puts("tpm response:\n");
225 print_byte_string(response
, response_length
);
228 return report_return_code(rc
);
231 static int do_tpm_nv_define(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
234 u32 index
, perm
, size
;
237 return CMD_RET_USAGE
;
238 size
= type_string_get_space_size(argv
[1]);
240 printf("Couldn't parse arguments\n");
241 return CMD_RET_USAGE
;
243 index
= simple_strtoul(argv
[2], NULL
, 0);
244 perm
= simple_strtoul(argv
[3], NULL
, 0);
246 return report_return_code(tpm_nv_define_space(index
, perm
, size
));
249 static int do_tpm_nv_read(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
252 u32 index
, count
, err
;
256 return CMD_RET_USAGE
;
257 if (argc
!= 3 + type_string_get_num_values(argv
[1]))
258 return CMD_RET_USAGE
;
259 index
= simple_strtoul(argv
[2], NULL
, 0);
260 data
= type_string_alloc(argv
[1], &count
);
262 printf("Couldn't parse arguments\n");
263 return CMD_RET_USAGE
;
266 err
= tpm_nv_read_value(index
, data
, count
);
268 if (type_string_write_vars(argv
[1], data
, argv
+ 3)) {
269 printf("Couldn't write to variables\n");
275 return report_return_code(err
);
278 static int do_tpm_nv_write(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
281 u32 index
, count
, err
;
285 return CMD_RET_USAGE
;
286 if (argc
!= 3 + type_string_get_num_values(argv
[1]))
287 return CMD_RET_USAGE
;
288 index
= simple_strtoul(argv
[2], NULL
, 0);
289 data
= type_string_alloc(argv
[1], &count
);
291 printf("Couldn't parse arguments\n");
292 return CMD_RET_USAGE
;
294 if (type_string_pack(argv
[1], argv
+ 3, data
)) {
295 printf("Couldn't parse arguments\n");
297 return CMD_RET_USAGE
;
300 err
= tpm_nv_write_value(index
, data
, count
);
303 return report_return_code(err
);
306 #ifdef CONFIG_TPM_AUTH_SESSIONS
308 static int do_tpm_oiap(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
311 u32 auth_handle
, err
;
313 err
= tpm_oiap(&auth_handle
);
315 return report_return_code(err
);
318 #ifdef CONFIG_TPM_LOAD_KEY_BY_SHA1
319 static int do_tpm_load_key_by_sha1(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char *
322 u32 parent_handle
= 0;
323 u32 key_len
, key_handle
, err
;
324 u8 usage_auth
[DIGEST_LENGTH
];
325 u8 parent_hash
[DIGEST_LENGTH
];
329 return CMD_RET_USAGE
;
331 parse_byte_string(argv
[1], parent_hash
, NULL
);
332 key
= (void *)simple_strtoul(argv
[2], NULL
, 0);
333 key_len
= simple_strtoul(argv
[3], NULL
, 0);
334 if (strlen(argv
[4]) != 2 * DIGEST_LENGTH
)
335 return CMD_RET_FAILURE
;
336 parse_byte_string(argv
[4], usage_auth
, NULL
);
338 err
= tpm_find_key_sha1(usage_auth
, parent_hash
, &parent_handle
);
340 printf("Could not find matching parent key (err = %d)\n", err
);
341 return CMD_RET_FAILURE
;
344 printf("Found parent key %08x\n", parent_handle
);
346 err
= tpm_load_key2_oiap(parent_handle
, key
, key_len
, usage_auth
,
349 printf("Key handle is 0x%x\n", key_handle
);
350 env_set_hex("key_handle", key_handle
);
353 return report_return_code(err
);
355 #endif /* CONFIG_TPM_LOAD_KEY_BY_SHA1 */
357 static int do_tpm_load_key2_oiap(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
360 u32 parent_handle
, key_len
, key_handle
, err
;
361 u8 usage_auth
[DIGEST_LENGTH
];
365 return CMD_RET_USAGE
;
367 parent_handle
= simple_strtoul(argv
[1], NULL
, 0);
368 key
= (void *)simple_strtoul(argv
[2], NULL
, 0);
369 key_len
= simple_strtoul(argv
[3], NULL
, 0);
370 if (strlen(argv
[4]) != 2 * DIGEST_LENGTH
)
371 return CMD_RET_FAILURE
;
372 parse_byte_string(argv
[4], usage_auth
, NULL
);
374 err
= tpm_load_key2_oiap(parent_handle
, key
, key_len
, usage_auth
,
377 printf("Key handle is 0x%x\n", key_handle
);
379 return report_return_code(err
);
382 static int do_tpm_get_pub_key_oiap(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
386 u8 usage_auth
[DIGEST_LENGTH
];
387 u8 pub_key_buffer
[TPM_PUBKEY_MAX_LENGTH
];
388 size_t pub_key_len
= sizeof(pub_key_buffer
);
391 return CMD_RET_USAGE
;
393 key_handle
= simple_strtoul(argv
[1], NULL
, 0);
394 if (strlen(argv
[2]) != 2 * DIGEST_LENGTH
)
395 return CMD_RET_FAILURE
;
396 parse_byte_string(argv
[2], usage_auth
, NULL
);
398 err
= tpm_get_pub_key_oiap(key_handle
, usage_auth
, pub_key_buffer
,
401 printf("dump of received pub key structure:\n");
402 print_byte_string(pub_key_buffer
, pub_key_len
);
404 return report_return_code(err
);
407 TPM_COMMAND_NO_ARG(tpm_end_oiap
)
409 #endif /* CONFIG_TPM_AUTH_SESSIONS */
411 #ifdef CONFIG_TPM_FLUSH_RESOURCES
412 static int do_tpm_flush(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
418 return CMD_RET_USAGE
;
420 if (!strcasecmp(argv
[1], "key"))
422 else if (!strcasecmp(argv
[1], "auth"))
424 else if (!strcasecmp(argv
[1], "hash"))
426 else if (!strcasecmp(argv
[1], "trans"))
428 else if (!strcasecmp(argv
[1], "context"))
429 type
= TPM_RT_CONTEXT
;
430 else if (!strcasecmp(argv
[1], "counter"))
431 type
= TPM_RT_COUNTER
;
432 else if (!strcasecmp(argv
[1], "delegate"))
433 type
= TPM_RT_DELEGATE
;
434 else if (!strcasecmp(argv
[1], "daa_tpm"))
435 type
= TPM_RT_DAA_TPM
;
436 else if (!strcasecmp(argv
[1], "daa_v0"))
437 type
= TPM_RT_DAA_V0
;
438 else if (!strcasecmp(argv
[1], "daa_v1"))
439 type
= TPM_RT_DAA_V1
;
442 printf("Resource type %s unknown.\n", argv
[1]);
446 if (!strcasecmp(argv
[2], "all")) {
453 /* fetch list of already loaded resources in the TPM */
454 err
= tpm_get_capability(TPM_CAP_HANDLE
, type
, buf
,
457 printf("tpm_get_capability returned error %d.\n", err
);
460 res_count
= get_unaligned_be16(buf
);
462 for (i
= 0; i
< res_count
; ++i
, ptr
+= 4)
463 tpm_flush_specific(get_unaligned_be32(ptr
), type
);
465 u32 handle
= simple_strtoul(argv
[2], NULL
, 0);
468 printf("Illegal resource handle %s\n", argv
[2]);
471 tpm_flush_specific(cpu_to_be32(handle
), type
);
476 #endif /* CONFIG_TPM_FLUSH_RESOURCES */
478 #ifdef CONFIG_TPM_LIST_RESOURCES
479 static int do_tpm_list(cmd_tbl_t
*cmdtp
, int flag
, int argc
,
490 return CMD_RET_USAGE
;
492 if (!strcasecmp(argv
[1], "key"))
494 else if (!strcasecmp(argv
[1], "auth"))
496 else if (!strcasecmp(argv
[1], "hash"))
498 else if (!strcasecmp(argv
[1], "trans"))
500 else if (!strcasecmp(argv
[1], "context"))
501 type
= TPM_RT_CONTEXT
;
502 else if (!strcasecmp(argv
[1], "counter"))
503 type
= TPM_RT_COUNTER
;
504 else if (!strcasecmp(argv
[1], "delegate"))
505 type
= TPM_RT_DELEGATE
;
506 else if (!strcasecmp(argv
[1], "daa_tpm"))
507 type
= TPM_RT_DAA_TPM
;
508 else if (!strcasecmp(argv
[1], "daa_v0"))
509 type
= TPM_RT_DAA_V0
;
510 else if (!strcasecmp(argv
[1], "daa_v1"))
511 type
= TPM_RT_DAA_V1
;
514 printf("Resource type %s unknown.\n", argv
[1]);
518 /* fetch list of already loaded resources in the TPM */
519 err
= tpm_get_capability(TPM_CAP_HANDLE
, type
, buf
,
522 printf("tpm_get_capability returned error %d.\n", err
);
525 res_count
= get_unaligned_be16(buf
);
528 printf("Resources of type %s (%02x):\n", argv
[1], type
);
532 for (i
= 0; i
< res_count
; ++i
, ptr
+= 4)
533 printf("Index %d: %08x\n", i
, get_unaligned_be32(ptr
));
538 #endif /* CONFIG_TPM_LIST_RESOURCES */
540 TPM_COMMAND_NO_ARG(tpm_self_test_full
)
541 TPM_COMMAND_NO_ARG(tpm_continue_self_test
)
542 TPM_COMMAND_NO_ARG(tpm_force_clear
)
543 TPM_COMMAND_NO_ARG(tpm_physical_enable
)
544 TPM_COMMAND_NO_ARG(tpm_physical_disable
)
546 static cmd_tbl_t tpm1_commands
[] = {
547 U_BOOT_CMD_MKENT(info
, 0, 1, do_tpm_info
, "", ""),
548 U_BOOT_CMD_MKENT(init
, 0, 1, do_tpm_init
, "", ""),
549 U_BOOT_CMD_MKENT(startup
, 0, 1,
550 do_tpm_startup
, "", ""),
551 U_BOOT_CMD_MKENT(self_test_full
, 0, 1,
552 do_tpm_self_test_full
, "", ""),
553 U_BOOT_CMD_MKENT(continue_self_test
, 0, 1,
554 do_tpm_continue_self_test
, "", ""),
555 U_BOOT_CMD_MKENT(force_clear
, 0, 1,
556 do_tpm_force_clear
, "", ""),
557 U_BOOT_CMD_MKENT(physical_enable
, 0, 1,
558 do_tpm_physical_enable
, "", ""),
559 U_BOOT_CMD_MKENT(physical_disable
, 0, 1,
560 do_tpm_physical_disable
, "", ""),
561 U_BOOT_CMD_MKENT(nv_define_space
, 0, 1,
562 do_tpm_nv_define_space
, "", ""),
563 U_BOOT_CMD_MKENT(nv_read_value
, 0, 1,
564 do_tpm_nv_read_value
, "", ""),
565 U_BOOT_CMD_MKENT(nv_write_value
, 0, 1,
566 do_tpm_nv_write_value
, "", ""),
567 U_BOOT_CMD_MKENT(extend
, 0, 1,
568 do_tpm_extend
, "", ""),
569 U_BOOT_CMD_MKENT(pcr_read
, 0, 1,
570 do_tpm_pcr_read
, "", ""),
571 U_BOOT_CMD_MKENT(tsc_physical_presence
, 0, 1,
572 do_tpm_tsc_physical_presence
, "", ""),
573 U_BOOT_CMD_MKENT(read_pubek
, 0, 1,
574 do_tpm_read_pubek
, "", ""),
575 U_BOOT_CMD_MKENT(physical_set_deactivated
, 0, 1,
576 do_tpm_physical_set_deactivated
, "", ""),
577 U_BOOT_CMD_MKENT(get_capability
, 0, 1,
578 do_tpm_get_capability
, "", ""),
579 U_BOOT_CMD_MKENT(raw_transfer
, 0, 1,
580 do_tpm_raw_transfer
, "", ""),
581 U_BOOT_CMD_MKENT(nv_define
, 0, 1,
582 do_tpm_nv_define
, "", ""),
583 U_BOOT_CMD_MKENT(nv_read
, 0, 1,
584 do_tpm_nv_read
, "", ""),
585 U_BOOT_CMD_MKENT(nv_write
, 0, 1,
586 do_tpm_nv_write
, "", ""),
587 #ifdef CONFIG_TPM_AUTH_SESSIONS
588 U_BOOT_CMD_MKENT(oiap
, 0, 1,
589 do_tpm_oiap
, "", ""),
590 U_BOOT_CMD_MKENT(end_oiap
, 0, 1,
591 do_tpm_end_oiap
, "", ""),
592 U_BOOT_CMD_MKENT(load_key2_oiap
, 0, 1,
593 do_tpm_load_key2_oiap
, "", ""),
594 #ifdef CONFIG_TPM_LOAD_KEY_BY_SHA1
595 U_BOOT_CMD_MKENT(load_key_by_sha1
, 0, 1,
596 do_tpm_load_key_by_sha1
, "", ""),
597 #endif /* CONFIG_TPM_LOAD_KEY_BY_SHA1 */
598 U_BOOT_CMD_MKENT(get_pub_key_oiap
, 0, 1,
599 do_tpm_get_pub_key_oiap
, "", ""),
600 #endif /* CONFIG_TPM_AUTH_SESSIONS */
601 #ifdef CONFIG_TPM_FLUSH_RESOURCES
602 U_BOOT_CMD_MKENT(flush
, 0, 1,
603 do_tpm_flush
, "", ""),
604 #endif /* CONFIG_TPM_FLUSH_RESOURCES */
605 #ifdef CONFIG_TPM_LIST_RESOURCES
606 U_BOOT_CMD_MKENT(list
, 0, 1,
607 do_tpm_list
, "", ""),
608 #endif /* CONFIG_TPM_LIST_RESOURCES */
611 cmd_tbl_t
*get_tpm_commands(unsigned int *size
)
613 *size
= ARRAY_SIZE(tpm1_commands
);
615 return tpm1_commands
;
618 U_BOOT_CMD(tpm
, CONFIG_SYS_MAXARGS
, 1, do_tpm
,
619 "Issue a TPMv1.x command",
621 " - Issue TPM command <cmd> with arguments <args...>.\n"
622 "Admin Startup and State Commands:\n"
623 " info - Show information about the TPM\n"
625 " - Put TPM into a state where it waits for 'startup' command.\n"
627 " - Issue TPM_Starup command. <mode> is one of TPM_ST_CLEAR,\n"
628 " TPM_ST_STATE, and TPM_ST_DEACTIVATED.\n"
629 "Admin Testing Commands:\n"
631 " - Test all of the TPM capabilities.\n"
632 " continue_self_test\n"
633 " - Inform TPM that it should complete the self-test.\n"
634 "Admin Opt-in Commands:\n"
636 " - Set the PERMANENT disable flag to FALSE using physical presence as\n"
638 " physical_disable\n"
639 " - Set the PERMANENT disable flag to TRUE using physical presence as\n"
641 " physical_set_deactivated 0|1\n"
642 " - Set deactivated flag.\n"
643 "Admin Ownership Commands:\n"
645 " - Issue TPM_ForceClear command.\n"
646 " tsc_physical_presence flags\n"
647 " - Set TPM device's Physical Presence flags to <flags>.\n"
648 "The Capability Commands:\n"
649 " get_capability cap_area sub_cap addr count\n"
650 " - Read <count> bytes of TPM capability indexed by <cap_area> and\n"
651 " <sub_cap> to memory address <addr>.\n"
652 #if defined(CONFIG_TPM_FLUSH_RESOURCES) || defined(CONFIG_TPM_LIST_RESOURCES)
653 "Resource management functions\n"
655 #ifdef CONFIG_TPM_FLUSH_RESOURCES
656 " flush resource_type id\n"
657 " - flushes a resource of type <resource_type> (may be one of key, auth,\n"
658 " hash, trans, context, counter, delegate, daa_tpm, daa_v0, daa_v1),\n"
659 " and id <id> from the TPM. Use an <id> of \"all\" to flush all\n"
660 " resources of that type.\n"
661 #endif /* CONFIG_TPM_FLUSH_RESOURCES */
662 #ifdef CONFIG_TPM_LIST_RESOURCES
663 " list resource_type\n"
664 " - lists resources of type <resource_type> (may be one of key, auth,\n"
665 " hash, trans, context, counter, delegate, daa_tpm, daa_v0, daa_v1),\n"
666 " contained in the TPM.\n"
667 #endif /* CONFIG_TPM_LIST_RESOURCES */
668 #ifdef CONFIG_TPM_AUTH_SESSIONS
669 "Storage functions\n"
670 " loadkey2_oiap parent_handle key_addr key_len usage_auth\n"
671 " - loads a key data from memory address <key_addr>, <key_len> bytes\n"
672 " into TPM using the parent key <parent_handle> with authorization\n"
673 " <usage_auth> (20 bytes hex string).\n"
674 #ifdef CONFIG_TPM_LOAD_KEY_BY_SHA1
675 " load_key_by_sha1 parent_hash key_addr key_len usage_auth\n"
676 " - loads a key data from memory address <key_addr>, <key_len> bytes\n"
677 " into TPM using the parent hash <parent_hash> (20 bytes hex string)\n"
678 " with authorization <usage_auth> (20 bytes hex string).\n"
679 #endif /* CONFIG_TPM_LOAD_KEY_BY_SHA1 */
680 " get_pub_key_oiap key_handle usage_auth\n"
681 " - get the public key portion of a loaded key <key_handle> using\n"
682 " authorization <usage auth> (20 bytes hex string)\n"
683 #endif /* CONFIG_TPM_AUTH_SESSIONS */
684 "Endorsement Key Handling Commands:\n"
685 " read_pubek addr count\n"
686 " - Read <count> bytes of the public endorsement key to memory\n"
688 "Integrity Collection and Reporting Commands:\n"
689 " extend index digest_hex_string\n"
690 " - Add a new measurement to a PCR. Update PCR <index> with the 20-bytes\n"
691 " <digest_hex_string>\n"
692 " pcr_read index addr count\n"
693 " - Read <count> bytes from PCR <index> to memory address <addr>.\n"
694 #ifdef CONFIG_TPM_AUTH_SESSIONS
695 "Authorization Sessions\n"
697 " - setup an OIAP session\n"
699 " - terminates an active OIAP session\n"
700 #endif /* CONFIG_TPM_AUTH_SESSIONS */
701 "Non-volatile Storage Commands:\n"
702 " nv_define_space index permission size\n"
703 " - Establish a space at index <index> with <permission> of <size> bytes.\n"
704 " nv_read_value index addr count\n"
705 " - Read <count> bytes from space <index> to memory address <addr>.\n"
706 " nv_write_value index addr count\n"
707 " - Write <count> bytes from memory address <addr> to space <index>.\n"
708 "Miscellaneous helper functions:\n"
709 " raw_transfer byte_string\n"
710 " - Send a byte string <byte_string> to TPM and print the response.\n"
711 " Non-volatile storage helper functions:\n"
712 " These helper functions treat a non-volatile space as a non-padded\n"
713 " sequence of integer values. These integer values are defined by a type\n"
714 " string, which is a text string of 'bwd' characters: 'b' means a 8-bit\n"
715 " value, 'w' 16-bit value, 'd' 32-bit value. All helper functions take\n"
716 " a type string as their first argument.\n"
717 " nv_define type_string index perm\n"
718 " - Define a space <index> with permission <perm>.\n"
719 " nv_read types_string index vars...\n"
720 " - Read from space <index> to environment variables <vars...>.\n"
721 " nv_write types_string index values...\n"
722 " - Write to space <index> from values <values...>.\n"