summaryrefslogtreecommitdiff
path: root/util/cbmem/cbmem.c
blob: 3a5a428e405bcdfa65ef7b5bf2d346c9a2a10160 (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
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
/*
 * This file is part of the coreboot project.
 *
 * Copyright 2012 Google Inc.
 *
 * 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 of the License.
 *
 * 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
 * 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 <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <getopt.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <libgen.h>
#include <assert.h>

#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#define MAP_BYTES (1024*1024)
#define IS_ENABLED(x) (defined (x) && (x))

#include "boot/coreboot_tables.h"

typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;

#include "cbmem.h"
#include "timestamp.h"

#define CBMEM_VERSION "1.1"

/* verbose output? */
static int verbose = 0;
#define debug(x...) if(verbose) printf(x)

/* File handle used to access /dev/mem */
static int fd;

/*
 * calculate ip checksum (16 bit quantities) on a passed in buffer. In case
 * the buffer length is odd last byte is excluded from the calculation
 */
static u16 ipchcksum(const void *addr, unsigned size)
{
	const u16 *p = addr;
	unsigned i, n = size / 2; /* don't expect odd sized blocks */
	u32 sum = 0;

	for (i = 0; i < n; i++)
		sum += p[i];

	sum = (sum >> 16) + (sum & 0xffff);
	sum += (sum >> 16);
	sum = ~sum & 0xffff;
	return (u16) sum;
}

/*
 * Functions to map / unmap physical memory into virtual address space. These
 * functions always maps 1MB at a time and can only map one area at once.
 */
static void *mapped_virtual;
static size_t mapped_size;

static inline size_t size_to_mib(size_t sz)
{
	return sz >> 20;
}

static void unmap_memory(void)
{
	if (mapped_virtual == NULL) {
		fprintf(stderr, "Error unmapping memory\n");
		return;
	}
	debug("Unmapping %zuMB of virtual memory at %p.\n",
	      size_to_mib(mapped_size), mapped_virtual);
	munmap(mapped_virtual, mapped_size);
	mapped_virtual = NULL;
	mapped_size = 0;
}

static void *map_memory_size(u64 physical, size_t size)
{
	void *v;
	off_t p;
	u64 page = getpagesize();
	size_t padding;

	if (mapped_virtual != NULL)
		unmap_memory();

	/* Mapped memory must be aligned to page size */
	p = physical & ~(page - 1);
	padding = physical & (page-1);
	size += padding;

	debug("Mapping %zuMB of physical memory at 0x%jx.\n",
	      size_to_mib(size), (intmax_t)p);

	v = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, p);

	if (v == MAP_FAILED) {
		fprintf(stderr, "Failed to mmap /dev/mem: %s\n",
			strerror(errno));
		exit(1);
	}

	/* Remember what we actually mapped ... */
	mapped_virtual = v;
	mapped_size = size;

	/* ... but return address to the physical memory that was requested */
	if (padding)
		debug("  ... padding virtual address with 0x%zx bytes.\n",
			padding);
	v += padding;

	return v;
}

static void *map_memory(u64 physical)
{
	return map_memory_size(physical, MAP_BYTES);
}

/*
 * Try finding the timestamp table and coreboot cbmem console starting from the
 * passed in memory offset.  Could be called recursively in case a forwarding
 * entry is found.
 *
 * Returns pointer to a memory buffer containg the timestamp table or zero if
 * none found.
 */

static struct lb_cbmem_ref timestamps;
static struct lb_cbmem_ref console;
static struct lb_memory_range cbmem;

/* This is a work-around for a nasty problem introduced by initially having
 * pointer sized entries in the lb_cbmem_ref structures. This caused problems
 * on 64bit x86 systems because coreboot is 32bit on those systems.
 * When the problem was found, it was corrected, but there are a lot of
 * systems out there with a firmware that does not produce the right
 * lb_cbmem_ref structure. Hence we try to autocorrect this issue here.
 */
static struct lb_cbmem_ref parse_cbmem_ref(struct lb_cbmem_ref *cbmem_ref)
{
	struct lb_cbmem_ref ret;

	ret = *cbmem_ref;

	if (cbmem_ref->size < sizeof(*cbmem_ref))
		ret.cbmem_addr = (uint32_t)ret.cbmem_addr;

	debug("      cbmem_addr = %" PRIx64 "\n", ret.cbmem_addr);

	return ret;
}

static int parse_cbtable(u64 address)
{
	int i, found = 0;
	void *buf;

	debug("Looking for coreboot table at %" PRIx64 "\n", address);
	buf = map_memory(address);

	/* look at every 16 bytes within 4K of the base */

	for (i = 0; i < 0x1000; i += 0x10) {
		struct lb_header *lbh;
		struct lb_record* lbr_p;
		void *lbtable;
		int j;

		lbh = (struct lb_header *)(buf + i);
		if (memcmp(lbh->signature, "LBIO", sizeof(lbh->signature)) ||
		    !lbh->header_bytes ||
		    ipchcksum(lbh, sizeof(*lbh))) {
			continue;
		}
		lbtable = buf + i + lbh->header_bytes;

		if (ipchcksum(lbtable, lbh->table_bytes) !=
		    lbh->table_checksum) {
			debug("Signature found, but wrong checksum.\n");
			continue;
		}

		found = 1;
		debug("Found!\n");

		for (j = 0; j < lbh->table_bytes; j += lbr_p->size) {
			lbr_p = (struct lb_record*) ((char *)lbtable + j);
			debug("  coreboot table entry 0x%02x\n", lbr_p->tag);
			switch (lbr_p->tag) {
			case LB_TAG_MEMORY: {
				int i = 0;
				debug("    Found memory map.\n");
				struct lb_memory *memory =
						(struct lb_memory *)lbr_p;
				while ((char *)&memory->map[i] < ((char *)lbtable
							    + lbr_p->size)) {
					if (memory->map[i].type == LB_MEM_TABLE) {
						debug("      LB_MEM_TABLE found.\n");
						/* The last one found is CBMEM */
						cbmem = memory->map[i];
					}
					i++;
				}
				continue;
			}
			case LB_TAG_TIMESTAMPS: {
				debug("    Found timestamp table.\n");
				timestamps = parse_cbmem_ref((struct lb_cbmem_ref *) lbr_p);
				continue;
			}
			case LB_TAG_CBMEM_CONSOLE: {
				debug("    Found cbmem console.\n");
				console = parse_cbmem_ref((struct lb_cbmem_ref *) lbr_p);
				continue;
			}
			case LB_TAG_FORWARD: {
				/*
				 * This is a forwarding entry - repeat the
				 * search at the new address.
				 */
				struct lb_forward lbf_p =
					*(struct lb_forward *) lbr_p;
				debug("    Found forwarding entry.\n");
				unmap_memory();
				return parse_cbtable(lbf_p.forward);
			}
			default:
				break;
			}

		}
	}
	unmap_memory();

	return found;
}

#if defined(__i386__) || defined(__x86_64__)
/*
 * read CPU frequency from a sysfs file, return an frequency in Kilohertz as
 * an int or exit on any error.
 */
static u64 get_cpu_freq_KHz(void)
{
	FILE *cpuf;
	char freqs[100];
	int  size;
	char *endp;
	u64 rv;

	const char* freq_file =
		"/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq";

	cpuf = fopen(freq_file, "r");
	if (!cpuf) {
		fprintf(stderr, "Could not open %s: %s\n",
			freq_file, strerror(errno));
		exit(1);
	}

	memset(freqs, 0, sizeof(freqs));
	size = fread(freqs, 1, sizeof(freqs), cpuf);
	if (!size || (size == sizeof(freqs))) {
		fprintf(stderr, "Wrong number of bytes(%d) read from %s\n",
			size, freq_file);
		exit(1);
	}
	fclose(cpuf);
	rv = strtoull(freqs, &endp, 10);

	if (*endp == '\0' || *endp == '\n')
		return rv;
	fprintf(stderr, "Wrong formatted value ^%s^ read from %s\n",
		freqs, freq_file);
	exit(1);
}

/* On x86 platforms timestamps are stored
 * in CPU cycles (from rdtsc). Hence the
 * timestamp divider is the CPU frequency
 * in MHz.
 */
u64 arch_convert_raw_ts_entry(u64 ts)
{
	static u64 cpu_freq_mhz = 0;

	if (!cpu_freq_mhz)
		cpu_freq_mhz = get_cpu_freq_KHz() / 1000;

	return ts / cpu_freq_mhz;
}

#else

/* On non-x86 platforms the timestamp entries
 * are not in clock cycles but in usecs
 */
u64 arch_convert_raw_ts_entry(u64 ts)
{
	return ts;
}
#endif

/*
 * Print an integer in 'normalized' form - with commas separating every three
 * decimal orders. The 'comma' parameter indicates if a comma is needed after
 * the value is printed.
 */
static void print_norm(u64 v, int comma)
{
	int first_triple = 1;

	if (v > 1000) {
		/* print the higher order sections first */
		print_norm(v / 1000, 1);
		first_triple = 0;
	}
	if (first_triple)
		printf("%d", (u32)(v % 1000));
	else
		printf("%3.3d", (u32)(v % 1000));
	if (comma)
		printf(",");
}

enum additional_timestamp_id {
	// Depthcharge entry IDs start at 1000.
	TS_DC_START = 1000,

	TS_RO_PARAMS_INIT = 1001,
	TS_RO_VB_INIT = 1002,
	TS_RO_VB_SELECT_FIRMWARE = 1003,
	TS_RO_VB_SELECT_AND_LOAD_KERNEL = 1004,

	TS_RW_VB_SELECT_AND_LOAD_KERNEL = 1010,

	TS_VB_SELECT_AND_LOAD_KERNEL = 1020,

	TS_CROSSYSTEM_DATA = 1100,
	TS_START_KERNEL = 1101
};

static const struct timestamp_id_to_name {
	u32 id;
	const char *name;
} timestamp_ids[] = {
	{ TS_START_ROMSTAGE,	"start of rom stage" },
	{ TS_BEFORE_INITRAM,	"before ram initialization" },
	{ TS_AFTER_INITRAM,	"after ram initialization" },
	{ TS_END_ROMSTAGE,	"end of romstage" },
	{ TS_START_VBOOT,	"start of verified boot" },
	{ TS_END_VBOOT,		"end of verified boot" },
	{ TS_START_COPYRAM,	"start of copying ram stage" },
	{ TS_END_COPYRAM,	"end of copying ram stage" },
	{ TS_START_RAMSTAGE,	"start of ramstage" },
	{ TS_DEVICE_ENUMERATE,	"device enumeration" },
	{ TS_DEVICE_CONFIGURE,	"device configuration" },
	{ TS_DEVICE_ENABLE,	"device enable" },
	{ TS_DEVICE_INITIALIZE,	"device initialization" },
	{ TS_DEVICE_DONE,	"device setup done" },
	{ TS_CBMEM_POST,	"cbmem post" },
	{ TS_WRITE_TABLES,	"write tables" },
	{ TS_LOAD_PAYLOAD,	"load payload" },
	{ TS_ACPI_WAKE_JUMP,	"ACPI wake jump" },
	{ TS_SELFBOOT_JUMP,	"selfboot jump" },
	{ TS_DC_START,		"depthcharge start" },
	{ TS_RO_PARAMS_INIT,	"RO parameter init" },
	{ TS_RO_VB_INIT,	"RO vboot init" },
	{ TS_RO_VB_SELECT_FIRMWARE,		"RO vboot select firmware" },
	{ TS_RO_VB_SELECT_AND_LOAD_KERNEL,	"RO vboot select&load kernel" },
	{ TS_RW_VB_SELECT_AND_LOAD_KERNEL,	"RW vboot select&load kernel" },
	{ TS_VB_SELECT_AND_LOAD_KERNEL,		"vboot select&load kernel" },
	{ TS_CROSSYSTEM_DATA,	"crossystem data" },
	{ TS_START_KERNEL,	"start kernel" }
};

void timestamp_print_entry(uint32_t id, uint64_t stamp, uint64_t prev_stamp)
{
	int i;
	const char *name;

	name = "<unknown>";
	for (i = 0; i < ARRAY_SIZE(timestamp_ids); i++) {
		if (timestamp_ids[i].id == id) {
			name = timestamp_ids[i].name;
			break;
		}
	}

	printf("%4d:", id);
	printf("%-30s", name);
	print_norm(arch_convert_raw_ts_entry(stamp), 0);
	if (prev_stamp) {
		printf(" (");
		print_norm(arch_convert_raw_ts_entry(stamp
				- prev_stamp), 0);
		printf(")");
	}
	printf("\n");
}

/* dump the timestamp table */
static void dump_timestamps(void)
{
	int i;
	struct timestamp_table *tst_p;

	if (timestamps.tag != LB_TAG_TIMESTAMPS) {
		fprintf(stderr, "No timestamps found in coreboot table.\n");
		return;
	}

	tst_p = (struct timestamp_table *)
			map_memory((unsigned long)timestamps.cbmem_addr);

	printf("%d entries total:\n\n", tst_p->num_entries);
	for (i = 0; i < tst_p->num_entries; i++) {
		const struct timestamp_entry *tse_p = tst_p->entries + i;
		timestamp_print_entry(tse_p->entry_id, tse_p->entry_stamp,
			i ? tse_p[-1].entry_stamp : 0);
	}

	unmap_memory();
}

/* dump the cbmem console */
static void dump_console(void)
{
	void *console_p;
	char *console_c;
	uint32_t size;
	uint32_t cursor;

	if (console.tag != LB_TAG_CBMEM_CONSOLE) {
		fprintf(stderr, "No console found in coreboot table.\n");
		return;
	}

	console_p = map_memory((unsigned long)console.cbmem_addr);
	/* The in-memory format of the console area is:
	 *  u32  size
	 *  u32  cursor
	 *  char console[size]
	 * Hence we have to add 8 to get to the actual console string.
	 */
	size = ((uint32_t *)console_p)[0];
	cursor = ((uint32_t *)console_p)[1];
	/* Cursor continues to go on even after no more data fits in
	 * the buffer but the data is dropped in this case.
	 */
	if (size > cursor)
		size = cursor;
	console_c = malloc(size + 1);
	if (!console_c) {
		fprintf(stderr, "Not enough memory for console.\n");
		exit(1);
	}

	console_p = map_memory_size((unsigned long)console.cbmem_addr,
	                            size + sizeof(size) + sizeof(cursor));
	memcpy(console_c, console_p + 8, size);
	console_c[size] = 0;
	console_c[cursor] = 0;

	printf("%s\n", console_c);
	if (size < cursor)
		printf("%d %s lost\n", cursor - size,
			(cursor - size) == 1 ? "byte":"bytes");

	free(console_c);

	unmap_memory();
}

static void hexdump(unsigned long memory, int length)
{
	int i;
	uint8_t *m;
	int all_zero = 0;

	m = map_memory((intptr_t)memory);

	if (length > MAP_BYTES) {
		printf("Truncating hex dump from %d to %d bytes\n\n",
			length, MAP_BYTES);
		length = MAP_BYTES;
	}

	for (i = 0; i < length; i += 16) {
		int j;

		all_zero++;
		for (j = 0; j < 16; j++) {
			if(m[i+j] != 0) {
				all_zero = 0;
				break;
			}
		}

		if (all_zero < 2) {
			printf("%08lx:", memory + i);
			for (j = 0; j < 16; j++)
				printf(" %02x", m[i+j]);
			printf("  ");
			for (j = 0; j < 16; j++)
				printf("%c", isprint(m[i+j]) ? m[i+j] : '.');
			printf("\n");
		} else if (all_zero == 2) {
			printf("...\n");
		}
	}

	unmap_memory();
}

static void dump_cbmem_hex(void)
{
	if (cbmem.type != LB_MEM_TABLE) {
		fprintf(stderr, "No coreboot CBMEM area found!\n");
		return;
	}

	hexdump(unpack_lb64(cbmem.start), unpack_lb64(cbmem.size));
}

/* The root region is at least DYN_CBMEM_ALIGN_SIZE . */
#define DYN_CBMEM_ALIGN_SIZE (4096)
#define ROOT_MIN_SIZE DYN_CBMEM_ALIGN_SIZE
#define CBMEM_POINTER_MAGIC 0xc0389479
#define CBMEM_ENTRY_MAGIC ~(CBMEM_POINTER_MAGIC)

struct cbmem_root_pointer {
	uint32_t magic;
	uint32_t root;
} __attribute__((packed));

struct dynamic_cbmem_entry {
	uint32_t magic;
	uint32_t start;
	uint32_t size;
	uint32_t id;
} __attribute__((packed));

struct cbmem_root {
	uint32_t max_entries;
	uint32_t num_entries;
	uint32_t locked;
	uint32_t size;
	struct dynamic_cbmem_entry entries[0];
} __attribute__((packed));

#define CBMEM_MAGIC 0x434f5245
#define MAX_CBMEM_ENTRIES 16

struct cbmem_entry {
	uint32_t magic;
	uint32_t id;
	uint64_t base;
	uint64_t size;
} __attribute__((packed));

static const struct cbmem_id_to_name {
	u32 id;
	const char *name;
} cbmem_ids[] = {
	{ CBMEM_ID_FREESPACE,		"FREE SPACE " },
	{ CBMEM_ID_GDT,			"GDT        " },
	{ CBMEM_ID_ACPI,		"ACPI       " },
	{ CBMEM_ID_CBTABLE,		"COREBOOT   " },
	{ CBMEM_ID_PIRQ,		"IRQ TABLE  " },
	{ CBMEM_ID_MPTABLE,		"SMP TABLE  " },
	{ CBMEM_ID_RESUME,		"ACPI RESUME" },
	{ CBMEM_ID_RESUME_SCRATCH,	"ACPISCRATCH" },
	{ CBMEM_ID_ACPI_GNVS,		"ACPI GNVS  " },
	{ CBMEM_ID_ACPI_GNVS_PTR,	"GNVS PTR   " },
	{ CBMEM_ID_SMBIOS,		"SMBIOS     " },
	{ CBMEM_ID_TIMESTAMP,		"TIME STAMP " },
	{ CBMEM_ID_MRCDATA,		"MRC DATA   " },
	{ CBMEM_ID_CONSOLE,		"CONSOLE    " },
	{ CBMEM_ID_ELOG,		"ELOG       " },
	{ CBMEM_ID_COVERAGE,		"COVERAGE   " },
	{ CBMEM_ID_ROMSTAGE_INFO,	"ROMSTAGE   " },
	{ CBMEM_ID_ROMSTAGE_RAM_STACK,	"ROMSTG STCK" },
	{ CBMEM_ID_RAMSTAGE,		"RAMSTAGE   " },
	{ CBMEM_ID_RAMSTAGE_CACHE,	"RAMSTAGE $ " },
	{ CBMEM_ID_ROOT,		"CBMEM ROOT " },
	{ CBMEM_ID_VBOOT_HANDOFF,	"VBOOT      " },
	{ CBMEM_ID_CAR_GLOBALS,		"CAR GLOBALS" },
};

void cbmem_print_entry(int n, uint32_t id, uint64_t base, uint64_t size)
{
	int i;
	const char *name;

	name = NULL;
	for (i = 0; i < ARRAY_SIZE(cbmem_ids); i++) {
		if (cbmem_ids[i].id == id) {
			name = cbmem_ids[i].name;
			break;
		}
	}

	printf("%2d. ", n);
	if (name == NULL)
		printf("%08x ", id);
	else
		printf("%s", name);
	printf("  %08" PRIx64 " ", base);
	printf("  %08" PRIx64 "\n", size);
}

static void dump_static_cbmem_toc(struct cbmem_entry *entries)
{
	int i;

	printf("CBMEM table of contents:\n");
	printf("    ID           START      LENGTH\n");

	for (i=0; i<MAX_CBMEM_ENTRIES; i++) {
		if (entries[i].magic != CBMEM_MAGIC)
			break;
		cbmem_print_entry(i, entries[i].id,
				entries[i].base, entries[i].size);
	}
}

static void dump_dynamic_cbmem_toc(struct cbmem_root *root)
{
	int i;
	debug("CBMEM: max_entries=%d num_entries=%d locked=0x%x, size=%d\n\n",
		root->max_entries, root->num_entries, root->locked, root->size);

	printf("CBMEM table of contents:\n");
	printf("    ID           START      LENGTH\n");

	for (i = 0; i < root->num_entries; i++) {
		if(root->entries[i].magic != CBMEM_ENTRY_MAGIC)
			break;
		cbmem_print_entry(i, root->entries[i].id,
			root->entries[i].start, root->entries[i].size);
	}
}

static void dump_cbmem_toc(void)
{
	uint64_t start;
	void *cbmem_area;
	struct cbmem_entry *entries;

	if (cbmem.type != LB_MEM_TABLE) {
		fprintf(stderr, "No coreboot CBMEM area found!\n");
		return;
	}

	start = unpack_lb64(cbmem.start);

	cbmem_area = map_memory(start);
	entries = (struct cbmem_entry *)cbmem_area;

	if (entries[0].magic == CBMEM_MAGIC) {
		dump_static_cbmem_toc(entries);
	} else {
		uint64_t rootptr;

		rootptr = unpack_lb64(cbmem.start) + unpack_lb64(cbmem.size);
		rootptr &= ~(DYN_CBMEM_ALIGN_SIZE - 1);
		rootptr -= sizeof(struct cbmem_root_pointer);
		unmap_memory();
		struct cbmem_root_pointer *r =
			(struct cbmem_root_pointer *)map_memory(rootptr);
		if (r->magic == CBMEM_POINTER_MAGIC) {
			struct cbmem_root *root;
			uint64_t rootaddr = r->root;
			unmap_memory();
			/* Note that this only works because our default mmap
			 * size is 1MiB which happens to be larger than the
			 * root entry size which is default to be 4KiB.
			 */
			root = (struct cbmem_root *)map_memory(rootaddr);
			dump_dynamic_cbmem_toc(root);
		} else
			fprintf(stderr, "No valid coreboot CBMEM root pointer found.\n");
	}

	unmap_memory();
}

#define COVERAGE_MAGIC 0x584d4153
struct file {
	uint32_t magic;
	uint32_t next;
	uint32_t filename;
	uint32_t data;
	int offset;
	int len;
};

static int mkpath(char *path, mode_t mode)
{
	assert (path && *path);
	char *p;
	for (p = strchr(path+1, '/'); p; p = strchr(p + 1, '/')) {
		*p = '\0';
		if (mkdir(path, mode) == -1) {
			if (errno != EEXIST) {
				*p = '/';
				return -1;
			}
		}
		*p = '/';
	}
	return 0;
}

static void dump_coverage(void)
{
	int i, found = 0;
	uint64_t start;
	struct cbmem_entry *entries;
	void *coverage;
	unsigned long phys_offset;
#define phys_to_virt(x) ((void *)(unsigned long)(x) + phys_offset)

	if (cbmem.type != LB_MEM_TABLE) {
		fprintf(stderr, "No coreboot table area found!\n");
		return;
	}

	start = unpack_lb64(cbmem.start);

	entries = (struct cbmem_entry *)map_memory(start);

	for (i=0; i<MAX_CBMEM_ENTRIES; i++) {
		if (entries[i].magic != CBMEM_MAGIC)
			break;
		if (entries[i].id == CBMEM_ID_COVERAGE) {
			found = 1;
			break;
		}
	}

	if (!found) {
		unmap_memory();
		fprintf(stderr, "No coverage information found in"
			" CBMEM area.\n");
		return;
	}

	start = entries[i].base;
	unmap_memory();
	/* Map coverage area */
	coverage = map_memory(start);
	phys_offset = (unsigned long)coverage - (unsigned long)start;

	printf("Dumping coverage data...\n");

	struct file *file = (struct file *)coverage;
	while (file && file->magic == COVERAGE_MAGIC) {
		FILE *f;
		char *filename;

		debug(" -> %s\n", (char *)phys_to_virt(file->filename));
		filename = strdup((char *)phys_to_virt(file->filename));
		if (mkpath(filename, 0755) == -1) {
			perror("Directory for coverage data could "
				"not be created");
			exit(1);
		}
		f = fopen(filename, "wb");
		if (!f) {
			printf("Could not open %s: %s\n",
				filename, strerror(errno));
			exit(1);
		}
		if (fwrite((void *)phys_to_virt(file->data),
						file->len, 1, f) != 1) {
			printf("Could not write to %s: %s\n",
				filename, strerror(errno));
			exit(1);
		}
		fclose(f);
		free(filename);

		if (file->next)
			file = (struct file *)phys_to_virt(file->next);
		else
			file = NULL;
	}
	unmap_memory();
}

static void print_version(void)
{
	printf("cbmem v%s -- ", CBMEM_VERSION);
	printf("Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.\n\n");
	printf(
    "This program is free software: you can redistribute it and/or modify\n"
    "it under the terms of the GNU General Public License as published by\n"
    "the Free Software Foundation, version 2 of the License.\n\n"
    "This program is distributed in the hope that it will be useful,\n"
    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
    "GNU General Public License for more details.\n\n"
    "You should have received a copy of the GNU General Public License\n"
    "along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\n");
}

static void print_usage(const char *name)
{
	printf("usage: %s [-cCltxVvh?]\n", name);
	printf("\n"
	     "   -c | --console:                   print cbmem console\n"
	     "   -C | --coverage:                  dump coverage information\n"
	     "   -l | --list:                      print cbmem table of contents\n"
	     "   -x | --hexdump:                   print hexdump of cbmem area\n"
	     "   -t | --timestamps:                print timestamp information\n"
	     "   -V | --verbose:                   verbose (debugging) output\n"
	     "   -v | --version:                   print the version\n"
	     "   -h | --help:                      print this help\n"
	     "\n");
	exit(1);
}

int main(int argc, char** argv)
{
	int print_defaults = 1;
	int print_console = 0;
	int print_coverage = 0;
	int print_list = 0;
	int print_hexdump = 0;
	int print_timestamps = 0;

	int opt, option_index = 0;
	static struct option long_options[] = {
		{"console", 0, 0, 'c'},
		{"coverage", 0, 0, 'C'},
		{"list", 0, 0, 'l'},
		{"timestamps", 0, 0, 't'},
		{"hexdump", 0, 0, 'x'},
		{"verbose", 0, 0, 'V'},
		{"version", 0, 0, 'v'},
		{"help", 0, 0, 'h'},
		{0, 0, 0, 0}
	};
	while ((opt = getopt_long(argc, argv, "cCltxVvh?",
				  long_options, &option_index)) != EOF) {
		switch (opt) {
		case 'c':
			print_console = 1;
			print_defaults = 0;
			break;
		case 'C':
			print_coverage = 1;
			print_defaults = 0;
			break;
		case 'l':
			print_list = 1;
			print_defaults = 0;
			break;
		case 'x':
			print_hexdump = 1;
			print_defaults = 0;
			break;
		case 't':
			print_timestamps = 1;
			print_defaults = 0;
			break;
		case 'V':
			verbose = 1;
			break;
		case 'v':
			print_version();
			exit(0);
			break;
		case 'h':
		case '?':
		default:
			print_usage(argv[0]);
			exit(0);
			break;
		}
	}

	fd = open("/dev/mem", O_RDONLY, 0);
	if (fd < 0) {
		fprintf(stderr, "Failed to gain memory access: %s\n",
			strerror(errno));
		return 1;
	}

#ifdef __arm__
	int dt_fd;
	uint32_t cbtable_base;

	dt_fd = open("/proc/device-tree/firmware/coreboot/coreboot-table",
			O_RDONLY, 0);
	if (dt_fd < 0) {
		fprintf(stderr, "Failed to open device tree node: %s\n",
			strerror(errno));
		return 1;
	}

	if (read(dt_fd, &cbtable_base, 4) != 4) {
		fprintf(stderr, "Failed to read device tree node: %s\n",
			strerror(errno));
		return 1;
	}
	close(dt_fd);

	parse_cbtable(ntohl(cbtable_base));
#else
	int j;
	static const int possible_base_addresses[] = { 0, 0xf0000 };

	/* Find and parse coreboot table */
	for (j = 0; j < ARRAY_SIZE(possible_base_addresses); j++) {
		if (parse_cbtable(possible_base_addresses[j]))
			break;
	}
#endif

	if (print_console)
		dump_console();

	if (print_coverage)
		dump_coverage();

	if (print_list)
		dump_cbmem_toc();

	if (print_hexdump)
		dump_cbmem_hex();

	if (print_defaults || print_timestamps)
		dump_timestamps();

	close(fd);
	return 0;
}