summaryrefslogtreecommitdiff
path: root/util/nvramtool/cli/nvramtool.c
blob: f3fb16d1b1087432f56c7ea1d22b7e036c03bd41 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
/*****************************************************************************\
 * nvramtool.c
 *****************************************************************************
 *  Copyright (C) 2002-2005 The Regents of the University of California.
 *  Produced at the Lawrence Livermore National Laboratory.
 *  Written by Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>.
 *  UCRL-CODE-2003-012
 *  All rights reserved.
 *
 *  This file is part of nvramtool, a utility for reading/writing coreboot
 *  parameters and displaying information from the coreboot table.
 *  For details, see http://coreboot.org/nvramtool.
 *
 *  Please also read the file DISCLAIMER which is included in this software
 *  distribution.
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License (as published by the
 *  Free Software Foundation) version 2, dated June 1991.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the terms and
 *  conditions of the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
\*****************************************************************************/

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include "common.h"
#include "opts.h"
#include "lbtable.h"
#include "layout.h"
#include "accessors/layout-text.h"
#include "input_file.h"
#include "cmos_ops.h"
#include "cmos_lowlevel.h"
#include "reg_expr.h"
#include "hexdump.h"
#include "cbfs.h"

typedef void (*op_fn_t) (void);

static void op_show_version(void);
static void op_show_usage(void);
static void op_lbtable_show_info(void);
static void op_lbtable_dump(void);
static void op_show_param_values(void);
static void op_cmos_show_one_param(void);
static void op_cmos_show_all_params(void);
static void op_cmos_set_one_param(void);
static void op_cmos_set_params_stdin(void);
static void op_cmos_set_params_file(void);
static void op_cmos_checksum(void);
static void op_show_layout(void);
static void op_write_cmos_dump(void);
static void op_read_cmos_dump(void);
static void op_show_cmos_hex_dump(void);
static void op_show_cmos_dumpfile(void);
static void op_write_cmos_layout_bin(void);
static void op_write_cmos_layout_header(void);
static int list_one_param(const char name[], int show_name);
static int list_all_params(void);
static void list_param_enums(const char name[]);
static void set_one_param(const char name[], const char value[]);
static void set_params(FILE * f);
static void parse_assignment(char arg[], const char **name, const char **value);
static int list_cmos_entry(const cmos_entry_t * e, int show_name);
static uint16_t convert_checksum_value(const char value[]);

static const op_fn_t op_fns[] = { op_show_version,
	op_show_usage,
	op_lbtable_show_info,
	op_lbtable_dump,
	op_show_param_values,
	op_cmos_show_one_param,
	op_cmos_show_all_params,
	op_cmos_set_one_param,
	op_cmos_set_params_stdin,
	op_cmos_set_params_file,
	op_cmos_checksum,
	op_show_layout,
	op_write_cmos_dump,
	op_read_cmos_dump,
	op_show_cmos_hex_dump,
	op_show_cmos_dumpfile,
	op_write_cmos_layout_bin,
	op_write_cmos_layout_header
};

static void op_write_cmos_layout_bin(void)
{
	get_layout_from_file();
	write_cmos_output_bin(nvramtool_op.param);
}

static void op_write_cmos_layout_header(void)
{
	get_layout_from_file();
	write_cmos_layout_header(nvramtool_op.param);
}

static const hexdump_format_t cmos_dump_format =
    { 16, 2, "", " | ", " ", " | ", '.' };

/****************************************************************************
 * main
 ****************************************************************************/
int main(int argc, char *argv[])
{
	void *cmos_default = NULL;
	cmos_layout_get_fn_t fn = get_layout_from_cmos_table;

	parse_nvramtool_args(argc, argv);

	/* If we should operate on a CBFS file default to reading the layout
	 * and CMOS contents from it. */
	if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CBFS_FILE].found) {
		open_cbfs(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CBFS_FILE].param);
		if (!nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].found) {
			cmos_default = cbfs_find_file("cmos.default", CBFS_COMPONENT_CMOS_DEFAULT, NULL);
			if (cmos_default == NULL) {
				fprintf(stderr, "Need a cmos.default in the CBFS image or separate cmos file (-D).\n");
				exit(1);
			}
		}
		fn = get_layout_from_cbfs_file;
	}

	/* If the user wants to use a specific layout file or explicitly use
	 * the coreboot option table allow him to override previous settings. */
	if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_LAYOUT_FILE].found) {
		set_layout_filename(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_LAYOUT_FILE].param);
		fn = get_layout_from_file;
	} else if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_OPT_TABLE].found) {
		fn = get_layout_from_cmos_table;
	}

	/* Allow the user to use a file for the CMOS contents, possibly
	 * overriding a previously opened "cmos.default" file from the CBFS. */
	if (nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].found) {
		struct stat fd_stat;
		int fd;

		if ((fd = open(nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param, O_RDWR | O_CREAT, 0666)) < 0) {
			fprintf(stderr, "Couldn't open '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
			exit(1);
		}

		if (fstat(fd, &fd_stat) == -1) {
			fprintf(stderr, "Couldn't stat '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
			exit(1);
		}

		if (fd_stat.st_size < 128) {
			lseek(fd, 127, SEEK_SET);
			if (write(fd, "\0", 1) != 1) {
				fprintf(stderr, "Unable to extended '%s' to its full size.\n",
						nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
				exit(1);
			}
			fsync(fd);
		}

		cmos_default = mmap(NULL, 128, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
		if (cmos_default == MAP_FAILED) {
			fprintf(stderr, "Couldn't map '%s'\n", nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
			exit(1);
		}
	}

	/* Switch to memory based CMOS access. */
	if (cmos_default) {
		select_hal(HAL_MEMORY, cmos_default);
	}

	register_cmos_layout_get_fn(fn);
	op_fns[nvramtool_op.op]();

	return 0;
}

/****************************************************************************
 * op_show_version
 *
 * -v
 *
 * Show version information for this program.
 ****************************************************************************/
static void op_show_version(void)
{
	printf("This is %s version %s.\n", prog_name, prog_version);
}

/****************************************************************************
 * op_show_usage
 *
 * -h
 *
 * Show a usage message for this program.
 ****************************************************************************/
static void op_show_usage(void)
{
	usage(stdout);
}

/****************************************************************************
 * op_lbtable_show_info
 *
 * -l [ARG]
 *
 * If ARG is present, show coreboot table information specified by ARG.
 * Else show all possible values for ARG.
 ****************************************************************************/
static void op_lbtable_show_info(void)
{
	if (nvramtool_op.param == NULL)
		list_lbtable_choices();
	else {
		get_lbtable();
		list_lbtable_item(nvramtool_op.param);
	}
}

/****************************************************************************
 * op_lbtable_dump
 *
 * -d
 *
 * Do low-level dump of coreboot table.
 ****************************************************************************/
static void op_lbtable_dump(void)
{
	get_lbtable();
	dump_lbtable();
}

/****************************************************************************
 * op_show_param_values
 *
 * -e NAME option
 *
 * Show all possible values for parameter NAME.
 ****************************************************************************/
static void op_show_param_values(void)
{
	get_cmos_layout();
	list_param_enums(nvramtool_op.param);
}

/****************************************************************************
 * op_cmos_show_one_param
 *
 * [-n] -r NAME
 *
 * Show parameter NAME.  If -n is specified, show value only.  Else show name
 * and value.
 ****************************************************************************/
static void op_cmos_show_one_param(void)
{
	int result;

	get_cmos_layout();
	result = list_one_param(nvramtool_op.param,
				!nvramtool_op_modifiers
				[NVRAMTOOL_MOD_SHOW_VALUE_ONLY].found);
	cmos_checksum_verify();

	if (result)
		exit(1);
}

/****************************************************************************
 * op_cmos_show_all_params
 *
 * -a
 *
 * Show names and values for all parameters.
 ****************************************************************************/
static void op_cmos_show_all_params(void)
{
	int result;

	get_cmos_layout();
	result = list_all_params();
	cmos_checksum_verify();

	if (result)
		exit(1);
}

/****************************************************************************
 * op_cmos_set_one_param
 *
 * -w NAME=VALUE
 *
 * Set parameter NAME to VALUE.
 ****************************************************************************/
static void op_cmos_set_one_param(void)
{
	const char *name, *value;

	get_cmos_layout();

	/* Separate 'NAME=VALUE' syntax into two strings representing NAME and
	 * VALUE.
	 */
	parse_assignment(nvramtool_op.param, &name, &value);

	set_one_param(name, value);
}

/****************************************************************************
 * op_cmos_set_params_stdin
 *
 * -i
 *
 * Set parameters according to standard input.
 ****************************************************************************/
static void op_cmos_set_params_stdin(void)
{
	get_cmos_layout();
	set_params(stdin);
}

/****************************************************************************
 * op_cmos_set_params_file
 *
 * -p INPUT_FILE
 *
 * Set parameters according to INPUT_FILE.
 ****************************************************************************/
static void op_cmos_set_params_file(void)
{
	FILE *f;

	if ((f = fopen(nvramtool_op.param, "r")) == NULL) {
		fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
			prog_name, nvramtool_op.param, strerror(errno));
		exit(1);
	}

	get_cmos_layout();
	set_params(f);
	fclose(f);
}

/****************************************************************************
 * op_cmos_checksum
 *
 * -c [VALUE]
 *
 * If VALUE is present, set coreboot CMOS checksum to VALUE.  Else show
 * checksum value.
 ****************************************************************************/
static void op_cmos_checksum(void)
{
	uint16_t checksum;

	get_cmos_layout();

	if (nvramtool_op.param == NULL) {
		set_iopl(3);
		checksum = cmos_checksum_read();
		set_iopl(0);
		printf("0x%x\n", checksum);
	} else {
		checksum = convert_checksum_value(nvramtool_op.param);
		set_iopl(3);
		cmos_checksum_write(checksum);
		set_iopl(0);
	}
}

/****************************************************************************
 * op_show_layout
 *
 * -Y
 *
 * Write CMOS layout information to standard output.
 ****************************************************************************/
static void op_show_layout(void)
{
	get_cmos_layout();
	write_cmos_layout(stdout);
}

/****************************************************************************
 * op_write_cmos_dump
 *
 * -b OUTPUT_FILE
 *
 * Write the contents of CMOS memory to a binary file.
 ****************************************************************************/
static void op_write_cmos_dump(void)
{
	unsigned char data[CMOS_SIZE];
	FILE *f;

	if ((f = fopen(nvramtool_op.param, "w")) == NULL) {
		fprintf(stderr, "%s: Can not open file %s for writing: %s\n",
			prog_name, nvramtool_op.param, strerror(errno));
		exit(1);
	}

	set_iopl(3);
	cmos_read_all(data);
	set_iopl(0);

	if (fwrite(data, 1, CMOS_SIZE, f) != CMOS_SIZE) {
		fprintf(stderr, "%s: Error writing CMOS data to file %s: %s\n",
			prog_name, nvramtool_op.param, strerror(errno));
		exit(1);
	}

	fclose(f);
}

/****************************************************************************
 * op_read_cmos_dump
 *
 * -B INPUT_FILE
 *
 * Read binary data from a file and write the data to CMOS memory.
 ****************************************************************************/
static void op_read_cmos_dump(void)
{
	unsigned char data[CMOS_SIZE];
	size_t nr_bytes;
	FILE *f;

	if ((f = fopen(nvramtool_op.param, "r")) == NULL) {
		fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
			prog_name, nvramtool_op.param, strerror(errno));
		exit(1);
	}

	if ((nr_bytes = fread(data, 1, CMOS_SIZE, f)) != CMOS_SIZE) {
		fprintf(stderr,
			"%s: Error: Only able to read %d bytes of CMOS data "
			"from file %s.  CMOS data is unchanged.\n", prog_name,
			(int)nr_bytes, nvramtool_op.param);
		exit(1);
	}

	fclose(f);
	set_iopl(3);
	cmos_write_all(data);
	set_iopl(0);
}

/****************************************************************************
 * op_show_cmos_hex_dump
 *
 * -x
 *
 * Write a hex dump of CMOS memory to standard output.
 ****************************************************************************/
static void op_show_cmos_hex_dump(void)
{
	unsigned char data[CMOS_SIZE];

	set_iopl(3);
	cmos_read_all(data);
	set_iopl(0);
	hexdump(data, CMOS_SIZE, 0, stdout, &cmos_dump_format);
}

/****************************************************************************
 * op_show_cmos_dumpfile
 *
 * -X DUMP_FILE
 *
 * Read binary data from a file (presumably a CMOS dump file) and display a
 * hex dump of the CMOS data from the file.
 ****************************************************************************/
static void op_show_cmos_dumpfile(void)
{
	unsigned char data[CMOS_SIZE];
	size_t nr_bytes;
	FILE *f;

	if ((f = fopen(nvramtool_op.param, "r")) == NULL) {
		fprintf(stderr, "%s: Can not open file %s for reading: %s\n",
			prog_name, nvramtool_op.param, strerror(errno));
		exit(1);
	}

	nr_bytes = fread(data, 1, CMOS_SIZE, f);
	fclose(f);
	hexdump(data, nr_bytes, 0, stdout, &cmos_dump_format);
}

/****************************************************************************
 * list_one_param
 *
 * Attempt to list one CMOS parameter given by 'name'.  'show_name' is a
 * boolean value indicating whether the parameter name should be displayed
 * along with its value.  Return 1 if error was encountered.  Else return OK.
 ****************************************************************************/
static int list_one_param(const char name[], int show_name)
{
	const cmos_entry_t *e;

	if (is_checksum_name(name) || ((e = find_cmos_entry(name)) == NULL)) {
		fprintf(stderr, "%s: CMOS parameter %s not found.\n", prog_name,
			name);
		exit(1);
	}

	if (e->config == CMOS_ENTRY_RESERVED) {
		fprintf(stderr, "%s: Parameter %s is reserved.\n", prog_name,
			name);
		exit(1);
	}

	return (list_cmos_entry(e, show_name) != 0);
}

/****************************************************************************
 * list_all_params
 *
 * Attempt to list all CMOS parameters.  Return 1 if error was encountered.
 * Else return OK.
 ****************************************************************************/
static int list_all_params(void)
{
	const cmos_entry_t *e;
	int result;

	result = OK;

	for (e = first_cmos_entry(); e != NULL; e = next_cmos_entry(e)) {
		if ((e->config == CMOS_ENTRY_RESERVED)
		    || is_checksum_name(e->name))
			continue;

		if (list_cmos_entry(e, TRUE))
			result = 1;
	}

	return result;
}

/****************************************************************************
 * list_param_enums
 *
 * List all possible values for CMOS parameter given by 'name'.
 ****************************************************************************/
static void list_param_enums(const char name[])
{
	const cmos_entry_t *e;
	const cmos_enum_t *p;

	if (is_checksum_name(name) || (e = find_cmos_entry(name)) == NULL) {
		fprintf(stderr, "%s: CMOS parameter %s not found.\n", prog_name,
			name);
		exit(1);
	}

	switch (e->config) {
	case CMOS_ENTRY_ENUM:
		for (p = first_cmos_enum_id(e->config_id);
		     p != NULL; p = next_cmos_enum_id(p))
			printf("%s\n", p->text);

		break;

	case CMOS_ENTRY_HEX:
		printf("Parameter %s requires a %u-bit unsigned integer.\n",
		       name, e->length);
		break;

	case CMOS_ENTRY_STRING:
		printf("Parameter %s requires a %u-byte string.\n", name,
		       e->length / 8);
		break;

	case CMOS_ENTRY_RESERVED:
		printf("Parameter %s is reserved.\n", name);
		break;

	default:
		BUG();
	}
}

/****************************************************************************
 * set_one_param
 *
 * Set the CMOS parameter given by 'name' to 'value'.  The 'name' parameter
 * is case-sensitive.  If we are setting an enum parameter, then 'value' is
 * interpreted as a case-sensitive string that must match the option name
 * exactly.  If we are setting a 'hex' parameter, then 'value' is treated as
 * a string representation of an unsigned integer that may be specified in
 * decimal, hex, or octal.
 ****************************************************************************/
static void set_one_param(const char name[], const char value[])
{
	const cmos_entry_t *e;
	unsigned long long n;

	if (is_checksum_name(name) || (e = find_cmos_entry(name)) == NULL) {
		fprintf(stderr, "%s: CMOS parameter %s not found.", prog_name,
			name);
		exit(1);
	}

	switch (prepare_cmos_write(e, value, &n)) {
	case OK:
		break;

	case CMOS_OP_BAD_ENUM_VALUE:
		fprintf(stderr, "%s: Bad value for parameter %s.", prog_name,
			name);
		goto fail;

	case CMOS_OP_NEGATIVE_INT:
		fprintf(stderr,
			"%s: This program does not support assignment of negative "
			"numbers to coreboot parameters.", prog_name);
		goto fail;

	case CMOS_OP_INVALID_INT:
		fprintf(stderr, "%s: %s is not a valid integer.", prog_name,
			value);
		goto fail;

	case CMOS_OP_RESERVED:
		fprintf(stderr,
			"%s: Can not modify reserved coreboot parameter %s.",
			prog_name, name);
		goto fail;

	case CMOS_OP_VALUE_TOO_WIDE:
		fprintf(stderr,
			"%s: Can not write value %s to CMOS parameter %s that is "
			"only %d bits wide.", prog_name, value, name,
			e->length);
		goto fail;

	case CMOS_OP_NO_MATCHING_ENUM:
		fprintf(stderr,
			"%s: coreboot parameter %s has no matching enums.",
			prog_name, name);
		goto fail;

	case CMOS_AREA_OUT_OF_RANGE:
		fprintf(stderr,
			"%s: The CMOS area specified by the layout info for "
			"coreboot parameter %s is out of range.", prog_name,
			name);
		goto fail;

	case CMOS_AREA_OVERLAPS_RTC:
		fprintf(stderr,
			"%s: The CMOS area specified by the layout info for "
			"coreboot parameter %s overlaps the realtime clock area.",
			prog_name, name);
		goto fail;

	case CMOS_AREA_TOO_WIDE:
		fprintf(stderr,
			"%s: The CMOS area specified by the layout info for "
			"coreboot parameter %s is too wide.", prog_name, name);
		goto fail;

	default:
		fprintf(stderr,
			"%s: Unknown error encountered while attempting to modify "
			"coreboot parameter %s.", prog_name, name);
		goto fail;
	}

	/* write the value to nonvolatile RAM */
	set_iopl(3);
	cmos_write(e, n);
	cmos_checksum_write(cmos_checksum_compute());
	set_iopl(0);
	return;

      fail:
	fprintf(stderr, "  CMOS write not performed.\n");
	exit(1);
}

/****************************************************************************
 * set_params
 *
 * Set coreboot parameters according to the contents of file 'f'.
 ****************************************************************************/
static void set_params(FILE * f)
{				/* First process the input file.  Then perform writes only if there were
				 * no problems processing the input.  Either all values will be written
				 * successfully or no values will be written.
				 */
	do_cmos_writes(process_input_file(f));
}

/****************************************************************************
 * parse_assignment
 *
 * Parse the string 'arg' (which supposedly represents an assignment) into a
 * NAME and a VALUE.  If 'arg' does not conform to the proper assignment
 * syntax, exit with a usage message.  Otherwise, on return, 'arg' is broken
 * into substrings representing NAME and VALUE, and *name and *value are set
 * to point to these two substrings.
 ****************************************************************************/
static void parse_assignment(char arg[], const char **name, const char **value)
{
	static const size_t N_MATCHES = 4;
	regmatch_t match[N_MATCHES];
	regex_t assignment;

	compile_reg_expr(REG_EXTENDED | REG_NEWLINE, assignment_regex, &assignment);

	/* Does 'arg' conform to proper assignment syntax?  If not, exit with a
	 * usage message.
	 */
	if (regexec(&assignment, arg, N_MATCHES, match, 0))
		usage(stderr);

	/* Ok, we found a valid assignment.  Break it into two strings
	 * representing NAME and VALUE.
	 */
	arg[match[1].rm_eo] = '\0';
	arg[match[2].rm_eo] = '\0';
	*name = &arg[match[1].rm_so];
	*value = &arg[match[2].rm_so];

	regfree(&assignment);
}

/****************************************************************************
 * list_cmos_entry
 *
 * Attempt to list the CMOS entry represented by 'e'.  'show_name' is a
 * boolean value indicating whether the parameter name should be displayed
 * along with its value.  On success, return OK.  On error, print an error
 * message and return 1.
 ****************************************************************************/
static int list_cmos_entry(const cmos_entry_t * e, int show_name)
{
	const cmos_enum_t *p;
	unsigned long long value;
	char *w;

	/* sanity check CMOS entry */
	switch (prepare_cmos_read(e)) {
	case OK:
		break;

	case CMOS_OP_RESERVED:
		BUG();

	case CMOS_AREA_OUT_OF_RANGE:
		fprintf(stderr,
			"%s: Can not read coreboot parameter %s because "
			"layout info specifies out of range CMOS area.\n",
			prog_name, e->name);
		return 1;

	case CMOS_AREA_OVERLAPS_RTC:
		fprintf(stderr,
			"%s: Can not read coreboot parameter %s because "
			"layout info specifies CMOS area that overlaps realtime "
			"clock area.\n", prog_name, e->name);
		return 1;

	case CMOS_AREA_TOO_WIDE:
		fprintf(stderr,
			"%s: Can not read coreboot parameter %s because "
			"layout info specifies CMOS area that is too wide.\n",
			prog_name, e->name);
		return 1;

	default:
		fprintf(stderr,
			"%s: Unknown error encountered while attempting to "
			"read coreboot parameter %s\n", prog_name, e->name);
		return 1;
	}

	/* read the value from CMOS */
	set_iopl(3);
	value = cmos_read(e);
	set_iopl(0);

	/* display the value */
	switch (e->config) {
	case CMOS_ENTRY_ENUM:
		if ((p = find_cmos_enum(e->config_id, value)) == NULL) {
			if (show_name)
				printf("# Bad value -> %s = 0x%llx\n", e->name,
				       value);
			else
				printf("Bad value -> 0x%llx\n", value);
		} else {
			if (show_name)
				printf("%s = %s\n", e->name, p->text);
			else
				printf("%s\n", p->text);
		}

		break;

	case CMOS_ENTRY_HEX:
		if (show_name)
			printf("%s = 0x%llx\n", e->name, value);
		else
			printf("0x%llx\n", value);

		break;

	case CMOS_ENTRY_STRING:
		w = (char *)(unsigned long)value;
		while (*w) {
			if(!isprint((int)(unsigned char)*w)) {
				if (show_name)
					printf("# Bad value -> %s\n", e->name);
				else
					printf("Bad value\n");
				break;
			}
			w++;
		}

		if (!*w) {

			if (show_name)
				printf("%s = %s\n", e->name,
				       (char *)(unsigned long)value);
			else
				printf("%s\n", (char *)(unsigned long)value);
		}

		free((void *)(unsigned long)value);

		break;

	case CMOS_ENTRY_RESERVED:
	default:
		BUG();
	}

	return OK;
}

/****************************************************************************
 * convert_checksum_value
 *
 * 'value' is the string representation of a checksum value that the user
 * wishes to set using the -c option.  Convert the string to a 16-bit
 * unsigned integer and return the result.  Exit with an error message if
 * 'value' is invalid.
 ****************************************************************************/
static uint16_t convert_checksum_value(const char value[])
{
	unsigned long n;
	const char *p;
	uint16_t result;
	int negative;

	for (p = value; isspace((int)(unsigned char)*p); p++) ;

	negative = (*p == '-');
	n = strtoul(value, (char **)&p, 0);

	if (*p) {
		fprintf(stderr,
			"%s: Checksum value %s is not a valid integer.\n",
			prog_name, value);
		exit(1);
	}

	if (negative) {
		fprintf(stderr,
			"%s: Checksum must be an unsigned integer.\n",
			prog_name);
		exit(1);
	}

	result = (uint16_t) n;

	if (result != n) {
		fprintf(stderr,
			"%s: Checksum value must fit within 16 bits.\n",
			prog_name);
		exit(1);
	}

	return result;
}