summaryrefslogtreecommitdiffstats
path: root/arch/arm/kernel/setup.c
blob: c45d10d07bde95f73034f47fd26877c41548ba08 (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
/*
 *  linux/arch/arm/kernel/setup.c
 *
 *  Copyright (C) 1995-2001 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/utsname.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/tty.h>
#include <linux/init.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>

#include <asm/cpu.h>
#include <asm/elf.h>
#include <asm/procinfo.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>

#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>

#ifndef MEM_SIZE
#define MEM_SIZE	(16*1024*1024)
#endif

#if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
char fpe_type[8];

static int __init fpe_setup(char *line)
{
	memcpy(fpe_type, line, 8);
	return 1;
}

__setup("fpe=", fpe_setup);
#endif

extern unsigned int mem_fclk_21285;
extern void paging_init(struct meminfo *, struct machine_desc *desc);
extern void convert_to_tag_list(struct tag *tags);
extern void squash_mem_tags(struct tag *tag);
extern void reboot_setup(char *str);
extern int root_mountflags;
extern void _stext, _text, _etext, __data_start, _edata, _end;

unsigned int processor_id;
unsigned int __machine_arch_type;
EXPORT_SYMBOL(__machine_arch_type);

unsigned int system_rev;
EXPORT_SYMBOL(system_rev);

unsigned int system_serial_low;
EXPORT_SYMBOL(system_serial_low);

unsigned int system_serial_high;
EXPORT_SYMBOL(system_serial_high);

unsigned int elf_hwcap;
EXPORT_SYMBOL(elf_hwcap);


#ifdef MULTI_CPU
struct processor processor;
#endif
#ifdef MULTI_TLB
struct cpu_tlb_fns cpu_tlb;
#endif
#ifdef MULTI_USER
struct cpu_user_fns cpu_user;
#endif
#ifdef MULTI_CACHE
struct cpu_cache_fns cpu_cache;
#endif

struct stack {
	u32 irq[3];
	u32 abt[3];
	u32 und[3];
} ____cacheline_aligned;

static struct stack stacks[NR_CPUS];

char elf_platform[ELF_PLATFORM_SIZE];
EXPORT_SYMBOL(elf_platform);

unsigned long phys_initrd_start __initdata = 0;
unsigned long phys_initrd_size __initdata = 0;

static struct meminfo meminfo __initdata = { 0, };
static const char *cpu_name;
static const char *machine_name;
static char command_line[COMMAND_LINE_SIZE];

static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
#define ENDIANNESS ((char)endian_test.l)

DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);

/*
 * Standard memory resources
 */
static struct resource mem_res[] = {
	{ "Video RAM",   0,     0,     IORESOURCE_MEM			},
	{ "Kernel text", 0,     0,     IORESOURCE_MEM			},
	{ "Kernel data", 0,     0,     IORESOURCE_MEM			}
};

#define video_ram   mem_res[0]
#define kernel_code mem_res[1]
#define kernel_data mem_res[2]

static struct resource io_res[] = {
	{ "reserved",    0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
	{ "reserved",    0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
	{ "reserved",    0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
};

#define lp0 io_res[0]
#define lp1 io_res[1]
#define lp2 io_res[2]

static const char *cache_types[16] = {
	"write-through",
	"write-back",
	"write-back",
	"undefined 3",
	"undefined 4",
	"undefined 5",
	"write-back",
	"write-back",
	"undefined 8",
	"undefined 9",
	"undefined 10",
	"undefined 11",
	"undefined 12",
	"undefined 13",
	"write-back",
	"undefined 15",
};

static const char *cache_clean[16] = {
	"not required",
	"read-block",
	"cp15 c7 ops",
	"undefined 3",
	"undefined 4",
	"undefined 5",
	"cp15 c7 ops",
	"cp15 c7 ops",
	"undefined 8",
	"undefined 9",
	"undefined 10",
	"undefined 11",
	"undefined 12",
	"undefined 13",
	"cp15 c7 ops",
	"undefined 15",
};

static const char *cache_lockdown[16] = {
	"not supported",
	"not supported",
	"not supported",
	"undefined 3",
	"undefined 4",
	"undefined 5",
	"format A",
	"format B",
	"undefined 8",
	"undefined 9",
	"undefined 10",
	"undefined 11",
	"undefined 12",
	"undefined 13",
	"format C",
	"undefined 15",
};

static const char *proc_arch[] = {
	"undefined/unknown",
	"3",
	"4",
	"4T",
	"5",
	"5T",
	"5TE",
	"5TEJ",
	"6TEJ",
	"7",
	"?(11)",
	"?(12)",
	"?(13)",
	"?(14)",
	"?(15)",
	"?(16)",
	"?(17)",
};

#define CACHE_TYPE(x)	(((x) >> 25) & 15)
#define CACHE_S(x)	((x) & (1 << 24))
#define CACHE_DSIZE(x)	(((x) >> 12) & 4095)	/* only if S=1 */
#define CACHE_ISIZE(x)	((x) & 4095)

#define CACHE_SIZE(y)	(((y) >> 6) & 7)
#define CACHE_ASSOC(y)	(((y) >> 3) & 7)
#define CACHE_M(y)	((y) & (1 << 2))
#define CACHE_LINE(y)	((y) & 3)

static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
{
	unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);

	printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
		cpu, prefix,
		mult << (8 + CACHE_SIZE(cache)),
		(mult << CACHE_ASSOC(cache)) >> 1,
		8 << CACHE_LINE(cache),
		1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
			CACHE_LINE(cache)));
}

static void __init dump_cpu_info(int cpu)
{
	unsigned int info = read_cpuid(CPUID_CACHETYPE);

	if (info != processor_id) {
		printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
		       cache_types[CACHE_TYPE(info)]);
		if (CACHE_S(info)) {
			dump_cache("I cache", cpu, CACHE_ISIZE(info));
			dump_cache("D cache", cpu, CACHE_DSIZE(info));
		} else {
			dump_cache("cache", cpu, CACHE_ISIZE(info));
		}
	}
}

int cpu_architecture(void)
{
	int cpu_arch;

	if ((processor_id & 0x0008f000) == 0) {
		cpu_arch = CPU_ARCH_UNKNOWN;
	} else if ((processor_id & 0x0008f000) == 0x00007000) {
		cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
	} else if ((processor_id & 0x00080000) == 0x00000000) {
		cpu_arch = (processor_id >> 16) & 7;
		if (cpu_arch)
			cpu_arch += CPU_ARCH_ARMv3;
	} else {
		/* the revised CPUID */
		cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
	}

	return cpu_arch;
}

/*
 * These functions re-use the assembly code in head.S, which
 * already provide the required functionality.
 */
extern struct proc_info_list *lookup_processor_type(void);
extern struct machine_desc *lookup_machine_type(unsigned int);

static void __init setup_processor(void)
{
	struct proc_info_list *list;

	/*
	 * locate processor in the list of supported processor
	 * types.  The linker builds this table for us from the
	 * entries in arch/arm/mm/proc-*.S
	 */
	list = lookup_processor_type();
	if (!list) {
		printk("CPU configuration botched (ID %08x), unable "
		       "to continue.\n", processor_id);
		while (1);
	}

	cpu_name = list->cpu_name;

#ifdef MULTI_CPU
	processor = *list->proc;
#endif
#ifdef MULTI_TLB
	cpu_tlb = *list->tlb;
#endif
#ifdef MULTI_USER
	cpu_user = *list->user;
#endif
#ifdef MULTI_CACHE
	cpu_cache = *list->cache;
#endif

	printk("CPU: %s [%08x] revision %d (ARMv%s)\n",
	       cpu_name, processor_id, (int)processor_id & 15,
	       proc_arch[cpu_architecture()]);

	sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
	sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
	elf_hwcap = list->elf_hwcap;

	cpu_proc_init();
}

/*
 * cpu_init - initialise one CPU.
 *
 * cpu_init dumps the cache information, initialises SMP specific
 * information, and sets up the per-CPU stacks.
 */
void cpu_init(void)
{
	unsigned int cpu = smp_processor_id();
	struct stack *stk = &stacks[cpu];

	if (cpu >= NR_CPUS) {
		printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
		BUG();
	}

	if (system_state == SYSTEM_BOOTING)
		dump_cpu_info(cpu);

	/*
	 * setup stacks for re-entrant exception handlers
	 */
	__asm__ (
	"msr	cpsr_c, %1\n\t"
	"add	sp, %0, %2\n\t"
	"msr	cpsr_c, %3\n\t"
	"add	sp, %0, %4\n\t"
	"msr	cpsr_c, %5\n\t"
	"add	sp, %0, %6\n\t"
	"msr	cpsr_c, %7"
	    :
	    : "r" (stk),
	      "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
	      "I" (offsetof(struct stack, irq[0])),
	      "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
	      "I" (offsetof(struct stack, abt[0])),
	      "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
	      "I" (offsetof(struct stack, und[0])),
	      "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
	    : "r14");
}

static struct machine_desc * __init setup_machine(unsigned int nr)
{
	struct machine_desc *list;

	/*
	 * locate machine in the list of supported machines.
	 */
	list = lookup_machine_type(nr);
	if (!list) {
		printk("Machine configuration botched (nr %d), unable "
		       "to continue.\n", nr);
		while (1);
	}

	printk("Machine: %s\n", list->name);

	return list;
}

static void __init early_initrd(char **p)
{
	unsigned long start, size;

	start = memparse(*p, p);
	if (**p == ',') {
		size = memparse((*p) + 1, p);

		phys_initrd_start = start;
		phys_initrd_size = size;
	}
}
__early_param("initrd=", early_initrd);

static void __init add_memory(unsigned long start, unsigned long size)
{
	/*
	 * Ensure that start/size are aligned to a page boundary.
	 * Size is appropriately rounded down, start is rounded up.
	 */
	size -= start & ~PAGE_MASK;

	meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start);
	meminfo.bank[meminfo.nr_banks].size  = size & PAGE_MASK;
	meminfo.bank[meminfo.nr_banks].node  = PHYS_TO_NID(start);
	meminfo.nr_banks += 1;
}

/*
 * Pick out the memory size.  We look for mem=size@start,
 * where start and size are "size[KkMm]"
 */
static void __init early_mem(char **p)
{
	static int usermem __initdata = 0;
	unsigned long size, start;

	/*
	 * If the user specifies memory size, we
	 * blow away any automatically generated
	 * size.
	 */
	if (usermem == 0) {
		usermem = 1;
		meminfo.nr_banks = 0;
	}

	start = PHYS_OFFSET;
	size  = memparse(*p, p);
	if (**p == '@')
		start = memparse(*p + 1, p);

	add_memory(start, size);
}
__early_param("mem=", early_mem);

/*
 * Initial parsing of the command line.
 */
static void __init parse_cmdline(char **cmdline_p, char *from)
{
	char c = ' ', *to = command_line;
	int len = 0;

	for (;;) {
		if (c == ' ') {
			extern struct early_params __early_begin, __early_end;
			struct early_params *p;

			for (p = &__early_begin; p < &__early_end; p++) {
				int len = strlen(p->arg);

				if (memcmp(from, p->arg, len) == 0) {
					if (to != command_line)
						to -= 1;
					from += len;
					p->fn(&from);

					while (*from != ' ' && *from != '\0')
						from++;
					break;
				}
			}
		}
		c = *from++;
		if (!c)
			break;
		if (COMMAND_LINE_SIZE <= ++len)
			break;
		*to++ = c;
	}
	*to = '\0';
	*cmdline_p = command_line;
}

static void __init
setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
{
#ifdef CONFIG_BLK_DEV_RAM
	extern int rd_size, rd_image_start, rd_prompt, rd_doload;

	rd_image_start = image_start;
	rd_prompt = prompt;
	rd_doload = doload;

	if (rd_sz)
		rd_size = rd_sz;
#endif
}

static void __init
request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
{
	struct resource *res;
	int i;

	kernel_code.start   = virt_to_phys(&_text);
	kernel_code.end     = virt_to_phys(&_etext - 1);
	kernel_data.start   = virt_to_phys(&__data_start);
	kernel_data.end     = virt_to_phys(&_end - 1);

	for (i = 0; i < mi->nr_banks; i++) {
		unsigned long virt_start, virt_end;

		if (mi->bank[i].size == 0)
			continue;

		virt_start = __phys_to_virt(mi->bank[i].start);
		virt_end   = virt_start + mi->bank[i].size - 1;

		res = alloc_bootmem_low(sizeof(*res));
		res->name  = "System RAM";
		res->start = __virt_to_phys(virt_start);
		res->end   = __virt_to_phys(virt_end);
		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;

		request_resource(&iomem_resource, res);

		if (kernel_code.start >= res->start &&
		    kernel_code.end <= res->end)
			request_resource(res, &kernel_code);
		if (kernel_data.start >= res->start &&
		    kernel_data.end <= res->end)
			request_resource(res, &kernel_data);
	}

	if (mdesc->video_start) {
		video_ram.start = mdesc->video_start;
		video_ram.end   = mdesc->video_end;
		request_resource(&iomem_resource, &video_ram);
	}

	/*
	 * Some machines don't have the possibility of ever
	 * possessing lp0, lp1 or lp2
	 */
	if (mdesc->reserve_lp0)
		request_resource(&ioport_resource, &lp0);
	if (mdesc->reserve_lp1)
		request_resource(&ioport_resource, &lp1);
	if (mdesc->reserve_lp2)
		request_resource(&ioport_resource, &lp2);
}

/*
 *  Tag parsing.
 *
 * This is the new way of passing data to the kernel at boot time.  Rather
 * than passing a fixed inflexible structure to the kernel, we pass a list
 * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 * tag for the list to be recognised (to distinguish the tagged list from
 * a param_struct).  The list is terminated with a zero-length tag (this tag
 * is not parsed in any way).
 */
static int __init parse_tag_core(const struct tag *tag)
{
	if (tag->hdr.size > 2) {
		if ((tag->u.core.flags & 1) == 0)
			root_mountflags &= ~MS_RDONLY;
		ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
	}
	return 0;
}

__tagtable(ATAG_CORE, parse_tag_core);

static int __init parse_tag_mem32(const struct tag *tag)
{
	if (meminfo.nr_banks >= NR_BANKS) {
		printk(KERN_WARNING
		       "Ignoring memory bank 0x%08x size %dKB\n",
			tag->u.mem.start, tag->u.mem.size / 1024);
		return -EINVAL;
	}
	add_memory(tag->u.mem.start, tag->u.mem.size);
	return 0;
}

__tagtable(ATAG_MEM, parse_tag_mem32);

#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
struct screen_info screen_info = {
 .orig_video_lines	= 30,
 .orig_video_cols	= 80,
 .orig_video_mode	= 0,
 .orig_video_ega_bx	= 0,
 .orig_video_isVGA	= 1,
 .orig_video_points	= 8
};

static int __init parse_tag_videotext(const struct tag *tag)
{
	screen_info.orig_x            = tag->u.videotext.x;
	screen_info.orig_y            = tag->u.videotext.y;
	screen_info.orig_video_page   = tag->u.videotext.video_page;
	screen_info.orig_video_mode   = tag->u.videotext.video_mode;
	screen_info.orig_video_cols   = tag->u.videotext.video_cols;
	screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
	screen_info.orig_video_lines  = tag->u.videotext.video_lines;
	screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
	screen_info.orig_video_points = tag->u.videotext.video_points;
	return 0;
}

__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
#endif

static int __init parse_tag_ramdisk(const struct tag *tag)
{
	setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
		      (tag->u.ramdisk.flags & 2) == 0,
		      tag->u.ramdisk.start, tag->u.ramdisk.size);
	return 0;
}

__tagtable(ATAG_RAMDISK, parse_tag_ramdisk);

static int __init parse_tag_initrd(const struct tag *tag)
{
	printk(KERN_WARNING "ATAG_INITRD is deprecated; "
		"please update your bootloader.\n");
	phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
	phys_initrd_size = tag->u.initrd.size;
	return 0;
}

__tagtable(ATAG_INITRD, parse_tag_initrd);

static int __init parse_tag_initrd2(const struct tag *tag)
{
	phys_initrd_start = tag->u.initrd.start;
	phys_initrd_size = tag->u.initrd.size;
	return 0;
}

__tagtable(ATAG_INITRD2, parse_tag_initrd2);

static int __init parse_tag_serialnr(const struct tag *tag)
{
	system_serial_low = tag->u.serialnr.low;
	system_serial_high = tag->u.serialnr.high;
	return 0;
}

__tagtable(ATAG_SERIAL, parse_tag_serialnr);

static int __init parse_tag_revision(const struct tag *tag)
{
	system_rev = tag->u.revision.rev;
	return 0;
}

__tagtable(ATAG_REVISION, parse_tag_revision);

static int __init parse_tag_cmdline(const struct tag *tag)
{
	strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
	return 0;
}

__tagtable(ATAG_CMDLINE, parse_tag_cmdline);

/*
 * Scan the tag table for this tag, and call its parse function.
 * The tag table is built by the linker from all the __tagtable
 * declarations.
 */
static int __init parse_tag(const struct tag *tag)
{
	extern struct tagtable __tagtable_begin, __tagtable_end;
	struct tagtable *t;

	for (t = &__tagtable_begin; t < &__tagtable_end; t++)
		if (tag->hdr.tag == t->tag) {
			t->parse(tag);
			break;
		}

	return t < &__tagtable_end;
}

/*
 * Parse all tags in the list, checking both the global and architecture
 * specific tag tables.
 */
static void __init parse_tags(const struct tag *t)
{
	for (; t->hdr.size; t = tag_next(t))
		if (!parse_tag(t))
			printk(KERN_WARNING
				"Ignoring unrecognised tag 0x%08x\n",
				t->hdr.tag);
}

/*
 * This holds our defaults.
 */
static struct init_tags {
	struct tag_header hdr1;
	struct tag_core   core;
	struct tag_header hdr2;
	struct tag_mem32  mem;
	struct tag_header hdr3;
} init_tags __initdata = {
	{ tag_size(tag_core), ATAG_CORE },
	{ 1, PAGE_SIZE, 0xff },
	{ tag_size(tag_mem32), ATAG_MEM },
	{ MEM_SIZE, PHYS_OFFSET },
	{ 0, ATAG_NONE }
};

static void (*init_machine)(void) __initdata;

static int __init customize_machine(void)
{
	/* customizes platform devices, or adds new ones */
	if (init_machine)
		init_machine();
	return 0;
}
arch_initcall(customize_machine);

void __init setup_arch(char **cmdline_p)
{
	struct tag *tags = (struct tag *)&init_tags;
	struct machine_desc *mdesc;
	char *from = default_command_line;

	setup_processor();
	mdesc = setup_machine(machine_arch_type);
	machine_name = mdesc->name;

	if (mdesc->soft_reboot)
		reboot_setup("s");

	if (mdesc->boot_params)
		tags = phys_to_virt(mdesc->boot_params);

	/*
	 * If we have the old style parameters, convert them to
	 * a tag list.
	 */
	if (tags->hdr.tag != ATAG_CORE)
		convert_to_tag_list(tags);
	if (tags->hdr.tag != ATAG_CORE)
		tags = (struct tag *)&init_tags;

	if (mdesc->fixup)
		mdesc->fixup(mdesc, tags, &from, &meminfo);

	if (tags->hdr.tag == ATAG_CORE) {
		if (meminfo.nr_banks != 0)
			squash_mem_tags(tags);
		parse_tags(tags);
	}

	init_mm.start_code = (unsigned long) &_text;
	init_mm.end_code   = (unsigned long) &_etext;
	init_mm.end_data   = (unsigned long) &_edata;
	init_mm.brk	   = (unsigned long) &_end;

	memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
	saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
	parse_cmdline(cmdline_p, from);
	paging_init(&meminfo, mdesc);
	request_standard_resources(&meminfo, mdesc);

	cpu_init();

	/*
	 * Set up various architecture-specific pointers
	 */
	init_arch_irq = mdesc->init_irq;
	system_timer = mdesc->timer;
	init_machine = mdesc->init_machine;

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
	conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif
}


static int __init topology_init(void)
{
	int cpu;

	for_each_cpu(cpu)
		register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu, NULL);

	return 0;
}

subsys_initcall(topology_init);

static const char *hwcap_str[] = {
	"swp",
	"half",
	"thumb",
	"26bit",
	"fastmult",
	"fpa",
	"vfp",
	"edsp",
	"java",
	NULL
};

static void
c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
{
	unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);

	seq_printf(m, "%s size\t\t: %d\n"
		      "%s assoc\t\t: %d\n"
		      "%s line length\t: %d\n"
		      "%s sets\t\t: %d\n",
		type, mult << (8 + CACHE_SIZE(cache)),
		type, (mult << CACHE_ASSOC(cache)) >> 1,
		type, 8 << CACHE_LINE(cache),
		type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
			    CACHE_LINE(cache)));
}

static int c_show(struct seq_file *m, void *v)
{
	int i;

	seq_printf(m, "Processor\t: %s rev %d (%s)\n",
		   cpu_name, (int)processor_id & 15, elf_platform);

#if defined(CONFIG_SMP)
	for_each_online_cpu(i) {
		/*
		 * glibc reads /proc/cpuinfo to determine the number of
		 * online processors, looking for lines beginning with
		 * "processor".  Give glibc what it expects.
		 */
		seq_printf(m, "processor\t: %d\n", i);
		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
			   per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
			   (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
	}
#else /* CONFIG_SMP */
	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
		   loops_per_jiffy / (500000/HZ),
		   (loops_per_jiffy / (5000/HZ)) % 100);
#endif

	/* dump out the processor features */
	seq_puts(m, "Features\t: ");

	for (i = 0; hwcap_str[i]; i++)
		if (elf_hwcap & (1 << i))
			seq_printf(m, "%s ", hwcap_str[i]);

	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
	seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);

	if ((processor_id & 0x0008f000) == 0x00000000) {
		/* pre-ARM7 */
		seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
	} else {
		if ((processor_id & 0x0008f000) == 0x00007000) {
			/* ARM7 */
			seq_printf(m, "CPU variant\t: 0x%02x\n",
				   (processor_id >> 16) & 127);
		} else {
			/* post-ARM7 */
			seq_printf(m, "CPU variant\t: 0x%x\n",
				   (processor_id >> 20) & 15);
		}
		seq_printf(m, "CPU part\t: 0x%03x\n",
			   (processor_id >> 4) & 0xfff);
	}
	seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);

	{
		unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
		if (cache_info != processor_id) {
			seq_printf(m, "Cache type\t: %s\n"
				      "Cache clean\t: %s\n"
				      "Cache lockdown\t: %s\n"
				      "Cache format\t: %s\n",
				   cache_types[CACHE_TYPE(cache_info)],
				   cache_clean[CACHE_TYPE(cache_info)],
				   cache_lockdown[CACHE_TYPE(cache_info)],
				   CACHE_S(cache_info) ? "Harvard" : "Unified");

			if (CACHE_S(cache_info)) {
				c_show_cache(m, "I", CACHE_ISIZE(cache_info));
				c_show_cache(m, "D", CACHE_DSIZE(cache_info));
			} else {
				c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
			}
		}
	}

	seq_puts(m, "\n");

	seq_printf(m, "Hardware\t: %s\n", machine_name);
	seq_printf(m, "Revision\t: %04x\n", system_rev);
	seq_printf(m, "Serial\t\t: %08x%08x\n",
		   system_serial_high, system_serial_low);

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < 1 ? (void *)1 : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return NULL;
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= c_show
};