blob: 46fae1877520796ec57869484d74785c4a78d08c [file] [log] [blame]
Vadim Bendebury576fb1e2011-10-15 15:13:34 +00001/*
Che-liang Chiou8732b072013-02-28 09:34:57 +00002 * Copyright (c) 2013 The Chromium OS Authors.
Vadim Bendebury576fb1e2011-10-15 15:13:34 +00003 *
4 * See file CREDITS for list of people who contributed to this
5 * project.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20 * MA 02111-1307 USA
21 */
22
23#include <common.h>
24#include <command.h>
Che-liang Chiou8732b072013-02-28 09:34:57 +000025#include <malloc.h>
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000026#include <tpm.h>
Che-liang Chiou8732b072013-02-28 09:34:57 +000027#include <asm/unaligned.h>
28#include <linux/string.h>
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000029
Che-liang Chiou8732b072013-02-28 09:34:57 +000030/**
31 * Print a byte string in hexdecimal format, 16-bytes per line.
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000032 *
Che-liang Chiou8732b072013-02-28 09:34:57 +000033 * @param data byte string to be printed
34 * @param count number of bytes to be printed
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000035 */
Che-liang Chiou8732b072013-02-28 09:34:57 +000036static void print_byte_string(uint8_t *data, size_t count)
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000037{
Che-liang Chiou8732b072013-02-28 09:34:57 +000038 int i, print_newline = 0;
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000039
Che-liang Chiou8732b072013-02-28 09:34:57 +000040 for (i = 0; i < count; i++) {
41 printf(" %02x", data[i]);
42 print_newline = (i % 16 == 15);
43 if (print_newline)
44 putc('\n');
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000045 }
Che-liang Chiou8732b072013-02-28 09:34:57 +000046 /* Avoid duplicated newline at the end */
47 if (!print_newline)
48 putc('\n');
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000049}
50
Che-liang Chiou8732b072013-02-28 09:34:57 +000051/**
52 * Convert a text string of hexdecimal values into a byte string.
53 *
54 * @param bytes text string of hexdecimal values with no space
55 * between them
56 * @param data output buffer for byte string. The caller has to make
57 * sure it is large enough for storing the output. If
58 * NULL is passed, a large enough buffer will be allocated,
59 * and the caller must free it.
60 * @param count_ptr output variable for the length of byte string
61 * @return pointer to output buffer
62 */
63static void *parse_byte_string(char *bytes, uint8_t *data, size_t *count_ptr)
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +000064{
Che-liang Chiou8732b072013-02-28 09:34:57 +000065 char byte[3];
66 size_t count, length;
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +000067 int i;
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +000068
Che-liang Chiou8732b072013-02-28 09:34:57 +000069 length = strlen(bytes);
70 count = length / 2;
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +000071
Che-liang Chiou8732b072013-02-28 09:34:57 +000072 if (!data)
73 data = malloc(count);
74 if (!data)
75 return NULL;
76
77 byte[2] = '\0';
78 for (i = 0; i < length; i += 2) {
79 byte[0] = bytes[i];
80 byte[1] = bytes[i + 1];
81 data[i / 2] = (uint8_t)simple_strtoul(byte, NULL, 16);
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +000082 }
Che-liang Chiou8732b072013-02-28 09:34:57 +000083
84 if (count_ptr)
85 *count_ptr = count;
86
87 return data;
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +000088}
89
Che-liang Chiou8732b072013-02-28 09:34:57 +000090/**
91 * Convert TPM command return code to U-Boot command error codes.
92 *
93 * @param return_code TPM command return code
94 * @return value of enum command_ret_t
95 */
96static int convert_return_code(uint32_t return_code)
Vadim Bendebury576fb1e2011-10-15 15:13:34 +000097{
Che-liang Chiou8732b072013-02-28 09:34:57 +000098 if (return_code)
99 return CMD_RET_FAILURE;
100 else
101 return CMD_RET_SUCCESS;
Vadim Bendebury576fb1e2011-10-15 15:13:34 +0000102}
103
Che-liang Chiou8732b072013-02-28 09:34:57 +0000104/**
105 * Return number of values defined by a type string.
106 *
107 * @param type_str type string
108 * @return number of values of type string
109 */
110static int type_string_get_num_values(const char *type_str)
111{
112 return strlen(type_str);
113}
114
115/**
116 * Return total size of values defined by a type string.
117 *
118 * @param type_str type string
119 * @return total size of values of type string, or 0 if type string
120 * contains illegal type character.
121 */
122static size_t type_string_get_space_size(const char *type_str)
123{
124 size_t size;
125
126 for (size = 0; *type_str; type_str++) {
127 switch (*type_str) {
128 case 'b':
129 size += 1;
130 break;
131 case 'w':
132 size += 2;
133 break;
134 case 'd':
135 size += 4;
136 break;
137 default:
138 return 0;
139 }
140 }
141
142 return size;
143}
144
145/**
146 * Allocate a buffer large enough to hold values defined by a type
147 * string. The caller has to free the buffer.
148 *
149 * @param type_str type string
150 * @param count pointer for storing size of buffer
151 * @return pointer to buffer or NULL on error
152 */
153static void *type_string_alloc(const char *type_str, uint32_t *count)
154{
155 void *data;
156 size_t size;
157
158 size = type_string_get_space_size(type_str);
159 if (!size)
160 return NULL;
161 data = malloc(size);
162 if (data)
163 *count = size;
164
165 return data;
166}
167
168/**
169 * Pack values defined by a type string into a buffer. The buffer must have
170 * large enough space.
171 *
172 * @param type_str type string
173 * @param values text strings of values to be packed
174 * @param data output buffer of values
175 * @return 0 on success, non-0 on error
176 */
177static int type_string_pack(const char *type_str, char * const values[],
178 uint8_t *data)
179{
180 size_t offset;
181 uint32_t value;
182
183 for (offset = 0; *type_str; type_str++, values++) {
184 value = simple_strtoul(values[0], NULL, 0);
185 switch (*type_str) {
186 case 'b':
187 data[offset] = value;
188 offset += 1;
189 break;
190 case 'w':
191 put_unaligned_be16(value, data + offset);
192 offset += 2;
193 break;
194 case 'd':
195 put_unaligned_be32(value, data + offset);
196 offset += 4;
197 break;
198 default:
199 return -1;
200 }
201 }
202
203 return 0;
204}
205
206/**
207 * Read values defined by a type string from a buffer, and write these values
208 * to environment variables.
209 *
210 * @param type_str type string
211 * @param data input buffer of values
212 * @param vars names of environment variables
213 * @return 0 on success, non-0 on error
214 */
215static int type_string_write_vars(const char *type_str, uint8_t *data,
216 char * const vars[])
217{
218 size_t offset;
219 uint32_t value;
220
221 for (offset = 0; *type_str; type_str++, vars++) {
222 switch (*type_str) {
223 case 'b':
224 value = data[offset];
225 offset += 1;
226 break;
227 case 'w':
228 value = get_unaligned_be16(data + offset);
229 offset += 2;
230 break;
231 case 'd':
232 value = get_unaligned_be32(data + offset);
233 offset += 4;
234 break;
235 default:
236 return -1;
237 }
238 if (setenv_ulong(*vars, value))
239 return -1;
240 }
241
242 return 0;
243}
244
245static int do_tpm_startup(cmd_tbl_t *cmdtp, int flag,
246 int argc, char * const argv[])
247{
248 enum tpm_startup_type mode;
249
250 if (argc != 2)
251 return CMD_RET_USAGE;
252 if (!strcasecmp("TPM_ST_CLEAR", argv[1])) {
253 mode = TPM_ST_CLEAR;
254 } else if (!strcasecmp("TPM_ST_STATE", argv[1])) {
255 mode = TPM_ST_STATE;
256 } else if (!strcasecmp("TPM_ST_DEACTIVATED", argv[1])) {
257 mode = TPM_ST_DEACTIVATED;
258 } else {
259 printf("Couldn't recognize mode string: %s\n", argv[1]);
260 return CMD_RET_FAILURE;
261 }
262
263 return convert_return_code(tpm_startup(mode));
264}
265
266static int do_tpm_nv_define_space(cmd_tbl_t *cmdtp, int flag,
267 int argc, char * const argv[])
268{
269 uint32_t index, perm, size;
270
271 if (argc != 4)
272 return CMD_RET_USAGE;
273 index = simple_strtoul(argv[1], NULL, 0);
274 perm = simple_strtoul(argv[2], NULL, 0);
275 size = simple_strtoul(argv[3], NULL, 0);
276
277 return convert_return_code(tpm_nv_define_space(index, perm, size));
278}
279
280static int do_tpm_nv_read_value(cmd_tbl_t *cmdtp, int flag,
281 int argc, char * const argv[])
282{
283 uint32_t index, count, rc;
284 void *data;
285
286 if (argc != 4)
287 return CMD_RET_USAGE;
288 index = simple_strtoul(argv[1], NULL, 0);
289 data = (void *)simple_strtoul(argv[2], NULL, 0);
290 count = simple_strtoul(argv[3], NULL, 0);
291
292 rc = tpm_nv_read_value(index, data, count);
293 if (!rc) {
294 puts("area content:\n");
295 print_byte_string(data, count);
296 }
297
298 return convert_return_code(rc);
299}
300
301static int do_tpm_nv_write_value(cmd_tbl_t *cmdtp, int flag,
302 int argc, char * const argv[])
303{
304 uint32_t index, rc;
305 size_t count;
306 void *data;
307
308 if (argc != 3)
309 return CMD_RET_USAGE;
310 index = simple_strtoul(argv[1], NULL, 0);
311 data = parse_byte_string(argv[2], NULL, &count);
312 if (!data) {
313 printf("Couldn't parse byte string %s\n", argv[2]);
314 return CMD_RET_FAILURE;
315 }
316
317 rc = tpm_nv_write_value(index, data, count);
318 free(data);
319
320 return convert_return_code(rc);
321}
322
323static int do_tpm_extend(cmd_tbl_t *cmdtp, int flag,
324 int argc, char * const argv[])
325{
326 uint32_t index, rc;
327 uint8_t in_digest[20], out_digest[20];
328
329 if (argc != 3)
330 return CMD_RET_USAGE;
331 index = simple_strtoul(argv[1], NULL, 0);
332 if (!parse_byte_string(argv[2], in_digest, NULL)) {
333 printf("Couldn't parse byte string %s\n", argv[2]);
334 return CMD_RET_FAILURE;
335 }
336
337 rc = tpm_extend(index, in_digest, out_digest);
338 if (!rc) {
339 puts("PCR value after execution of the command:\n");
340 print_byte_string(out_digest, sizeof(out_digest));
341 }
342
343 return convert_return_code(rc);
344}
345
346static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag,
347 int argc, char * const argv[])
348{
349 uint32_t index, count, rc;
350 void *data;
351
352 if (argc != 4)
353 return CMD_RET_USAGE;
354 index = simple_strtoul(argv[1], NULL, 0);
355 data = (void *)simple_strtoul(argv[2], NULL, 0);
356 count = simple_strtoul(argv[3], NULL, 0);
357
358 rc = tpm_pcr_read(index, data, count);
359 if (!rc) {
360 puts("Named PCR content:\n");
361 print_byte_string(data, count);
362 }
363
364 return convert_return_code(rc);
365}
366
367static int do_tpm_tsc_physical_presence(cmd_tbl_t *cmdtp, int flag,
368 int argc, char * const argv[])
369{
370 uint16_t presence;
371
372 if (argc != 2)
373 return CMD_RET_USAGE;
374 presence = (uint16_t)simple_strtoul(argv[1], NULL, 0);
375
376 return convert_return_code(tpm_tsc_physical_presence(presence));
377}
378
379static int do_tpm_read_pubek(cmd_tbl_t *cmdtp, int flag,
380 int argc, char * const argv[])
381{
382 uint32_t count, rc;
383 void *data;
384
385 if (argc != 3)
386 return CMD_RET_USAGE;
387 data = (void *)simple_strtoul(argv[1], NULL, 0);
388 count = simple_strtoul(argv[2], NULL, 0);
389
390 rc = tpm_read_pubek(data, count);
391 if (!rc) {
392 puts("pubek value:\n");
393 print_byte_string(data, count);
394 }
395
396 return convert_return_code(rc);
397}
398
399static int do_tpm_physical_set_deactivated(cmd_tbl_t *cmdtp, int flag,
400 int argc, char * const argv[])
401{
402 uint8_t state;
403
404 if (argc != 2)
405 return CMD_RET_USAGE;
406 state = (uint8_t)simple_strtoul(argv[1], NULL, 0);
407
408 return convert_return_code(tpm_physical_set_deactivated(state));
409}
410
411static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag,
412 int argc, char * const argv[])
413{
414 uint32_t cap_area, sub_cap, rc;
415 void *cap;
416 size_t count;
417
418 if (argc != 5)
419 return CMD_RET_USAGE;
420 cap_area = simple_strtoul(argv[1], NULL, 0);
421 sub_cap = simple_strtoul(argv[2], NULL, 0);
422 cap = (void *)simple_strtoul(argv[3], NULL, 0);
423 count = simple_strtoul(argv[4], NULL, 0);
424
425 rc = tpm_get_capability(cap_area, sub_cap, cap, count);
426 if (!rc) {
427 puts("capability information:\n");
428 print_byte_string(cap, count);
429 }
430
431 return convert_return_code(rc);
432}
433
434#define TPM_COMMAND_NO_ARG(cmd) \
435static int do_##cmd(cmd_tbl_t *cmdtp, int flag, \
436 int argc, char * const argv[]) \
437{ \
438 if (argc != 1) \
439 return CMD_RET_USAGE; \
440 return convert_return_code(cmd()); \
441}
442
443TPM_COMMAND_NO_ARG(tpm_init)
444TPM_COMMAND_NO_ARG(tpm_self_test_full)
445TPM_COMMAND_NO_ARG(tpm_continue_self_test)
446TPM_COMMAND_NO_ARG(tpm_force_clear)
447TPM_COMMAND_NO_ARG(tpm_physical_enable)
448TPM_COMMAND_NO_ARG(tpm_physical_disable)
449
450static int do_tpm_raw_transfer(cmd_tbl_t *cmdtp, int flag,
451 int argc, char * const argv[])
452{
453 void *command;
454 uint8_t response[1024];
455 size_t count, response_length = sizeof(response);
456 uint32_t rc;
457
458 command = parse_byte_string(argv[1], NULL, &count);
459 if (!command) {
460 printf("Couldn't parse byte string %s\n", argv[1]);
461 return CMD_RET_FAILURE;
462 }
463
464 rc = tis_sendrecv(command, count, response, &response_length);
465 free(command);
466 if (!rc) {
467 puts("tpm response:\n");
468 print_byte_string(response, response_length);
469 }
470
471 return convert_return_code(rc);
472}
473
474static int do_tpm_nv_define(cmd_tbl_t *cmdtp, int flag,
475 int argc, char * const argv[])
476{
477 uint32_t index, perm, size;
478
479 if (argc != 4)
480 return CMD_RET_USAGE;
481 size = type_string_get_space_size(argv[1]);
482 if (!size) {
483 printf("Couldn't parse arguments\n");
484 return CMD_RET_USAGE;
485 }
486 index = simple_strtoul(argv[2], NULL, 0);
487 perm = simple_strtoul(argv[3], NULL, 0);
488
489 return convert_return_code(tpm_nv_define_space(index, perm, size));
490}
491
492static int do_tpm_nv_read(cmd_tbl_t *cmdtp, int flag,
493 int argc, char * const argv[])
494{
495 uint32_t index, count, err;
496 void *data;
497
498 if (argc < 3)
499 return CMD_RET_USAGE;
500 if (argc != 3 + type_string_get_num_values(argv[1]))
501 return CMD_RET_USAGE;
502 index = simple_strtoul(argv[2], NULL, 0);
503 data = type_string_alloc(argv[1], &count);
504 if (!data) {
505 printf("Couldn't parse arguments\n");
506 return CMD_RET_USAGE;
507 }
508
509 err = tpm_nv_read_value(index, data, count);
510 if (!err) {
511 if (type_string_write_vars(argv[1], data, argv + 3)) {
512 printf("Couldn't write to variables\n");
513 err = ~0;
514 }
515 }
516 free(data);
517
518 return convert_return_code(err);
519}
520
521static int do_tpm_nv_write(cmd_tbl_t *cmdtp, int flag,
522 int argc, char * const argv[])
523{
524 uint32_t index, count, err;
525 void *data;
526
527 if (argc < 3)
528 return CMD_RET_USAGE;
529 if (argc != 3 + type_string_get_num_values(argv[1]))
530 return CMD_RET_USAGE;
531 index = simple_strtoul(argv[2], NULL, 0);
532 data = type_string_alloc(argv[1], &count);
533 if (!data) {
534 printf("Couldn't parse arguments\n");
535 return CMD_RET_USAGE;
536 }
537 if (type_string_pack(argv[1], argv + 3, data)) {
538 printf("Couldn't parse arguments\n");
539 free(data);
540 return CMD_RET_USAGE;
541 }
542
543 err = tpm_nv_write_value(index, data, count);
544 free(data);
545
546 return convert_return_code(err);
547}
548
549#define MAKE_TPM_CMD_ENTRY(cmd) \
550 U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "")
551
552static cmd_tbl_t tpm_commands[] = {
553 U_BOOT_CMD_MKENT(init, 0, 1,
554 do_tpm_init, "", ""),
555 U_BOOT_CMD_MKENT(startup, 0, 1,
556 do_tpm_startup, "", ""),
557 U_BOOT_CMD_MKENT(self_test_full, 0, 1,
558 do_tpm_self_test_full, "", ""),
559 U_BOOT_CMD_MKENT(continue_self_test, 0, 1,
560 do_tpm_continue_self_test, "", ""),
561 U_BOOT_CMD_MKENT(force_clear, 0, 1,
562 do_tpm_force_clear, "", ""),
563 U_BOOT_CMD_MKENT(physical_enable, 0, 1,
564 do_tpm_physical_enable, "", ""),
565 U_BOOT_CMD_MKENT(physical_disable, 0, 1,
566 do_tpm_physical_disable, "", ""),
567 U_BOOT_CMD_MKENT(nv_define_space, 0, 1,
568 do_tpm_nv_define_space, "", ""),
569 U_BOOT_CMD_MKENT(nv_read_value, 0, 1,
570 do_tpm_nv_read_value, "", ""),
571 U_BOOT_CMD_MKENT(nv_write_value, 0, 1,
572 do_tpm_nv_write_value, "", ""),
573 U_BOOT_CMD_MKENT(extend, 0, 1,
574 do_tpm_extend, "", ""),
575 U_BOOT_CMD_MKENT(pcr_read, 0, 1,
576 do_tpm_pcr_read, "", ""),
577 U_BOOT_CMD_MKENT(tsc_physical_presence, 0, 1,
578 do_tpm_tsc_physical_presence, "", ""),
579 U_BOOT_CMD_MKENT(read_pubek, 0, 1,
580 do_tpm_read_pubek, "", ""),
581 U_BOOT_CMD_MKENT(physical_set_deactivated, 0, 1,
582 do_tpm_physical_set_deactivated, "", ""),
583 U_BOOT_CMD_MKENT(get_capability, 0, 1,
584 do_tpm_get_capability, "", ""),
585 U_BOOT_CMD_MKENT(raw_transfer, 0, 1,
586 do_tpm_raw_transfer, "", ""),
587 U_BOOT_CMD_MKENT(nv_define, 0, 1,
588 do_tpm_nv_define, "", ""),
589 U_BOOT_CMD_MKENT(nv_read, 0, 1,
590 do_tpm_nv_read, "", ""),
591 U_BOOT_CMD_MKENT(nv_write, 0, 1,
592 do_tpm_nv_write, "", ""),
593};
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +0000594
595static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
596{
Che-liang Chiou8732b072013-02-28 09:34:57 +0000597 cmd_tbl_t *tpm_cmd;
598
599 if (argc < 2)
600 return CMD_RET_USAGE;
601 tpm_cmd = find_cmd_tbl(argv[1], tpm_commands, ARRAY_SIZE(tpm_commands));
602 if (!tpm_cmd)
603 return CMD_RET_USAGE;
604
605 return tpm_cmd->cmd(cmdtp, flag, argc - 1, argv + 1);
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +0000606}
607
Che-liang Chiou8732b072013-02-28 09:34:57 +0000608U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm,
609"Issue a TPM command",
610"cmd args...\n"
611" - Issue TPM command <cmd> with arguments <args...>.\n"
612"Admin Startup and State Commands:\n"
613" init\n"
614" - Put TPM into a state where it waits for 'startup' command.\n"
615" startup mode\n"
616" - Issue TPM_Starup command. <mode> is one of TPM_ST_CLEAR,\n"
617" TPM_ST_STATE, and TPM_ST_DEACTIVATED.\n"
618"Admin Testing Commands:\n"
619" self_test_full\n"
620" - Test all of the TPM capabilities.\n"
621" continue_self_test\n"
622" - Inform TPM that it should complete the self-test.\n"
623"Admin Opt-in Commands:\n"
624" physical_enable\n"
625" - Set the PERMANENT disable flag to FALSE using physical presence as\n"
626" authorization.\n"
627" physical_disable\n"
628" - Set the PERMANENT disable flag to TRUE using physical presence as\n"
629" authorization.\n"
630" physical_set_deactivated 0|1\n"
631" - Set deactivated flag.\n"
632"Admin Ownership Commands:\n"
633" force_clear\n"
634" - Issue TPM_ForceClear command.\n"
635" tsc_physical_presence flags\n"
636" - Set TPM device's Physical Presence flags to <flags>.\n"
637"The Capability Commands:\n"
638" get_capability cap_area sub_cap addr count\n"
639" - Read <count> bytes of TPM capability indexed by <cap_area> and\n"
640" <sub_cap> to memory address <addr>.\n"
641"Endorsement Key Handling Commands:\n"
642" read_pubek addr count\n"
643" - Read <count> bytes of the public endorsement key to memory\n"
644" address <addr>\n"
645"Integrity Collection and Reporting Commands:\n"
646" extend index digest_hex_string\n"
647" - Add a new measurement to a PCR. Update PCR <index> with the 20-bytes\n"
648" <digest_hex_string>\n"
649" pcr_read index addr count\n"
650" - Read <count> bytes from PCR <index> to memory address <addr>.\n"
651"Non-volatile Storage Commands:\n"
652" nv_define_space index permission size\n"
653" - Establish a space at index <index> with <permission> of <size> bytes.\n"
654" nv_read_value index addr count\n"
655" - Read <count> bytes from space <index> to memory address <addr>.\n"
656" nv_write_value index addr count\n"
657" - Write <count> bytes from memory address <addr> to space <index>.\n"
658"Miscellaneous helper functions:\n"
659" raw_transfer byte_string\n"
660" - Send a byte string <byte_string> to TPM and print the response.\n"
661" Non-volatile storage helper functions:\n"
662" These helper functions treat a non-volatile space as a non-padded\n"
663" sequence of integer values. These integer values are defined by a type\n"
664" string, which is a text string of 'bwd' characters: 'b' means a 8-bit\n"
665" value, 'w' 16-bit value, 'd' 32-bit value. All helper functions take\n"
666" a type string as their first argument.\n"
667" nv_define type_string index perm\n"
668" - Define a space <index> with permission <perm>.\n"
669" nv_read types_string index vars...\n"
670" - Read from space <index> to environment variables <vars...>.\n"
671" nv_write types_string index values...\n"
672" - Write to space <index> from values <values...>.\n"
Luigi Semenzatoeea3f4d2012-12-05 14:46:44 +0000673);