summaryrefslogtreecommitdiffstats
path: root/arch/xtensa/kernel/setup.c
blob: d9204dc2656e718a3826e703819418d409036e25 (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
/*
 * arch/xtensa/kernel/setup.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995  Linus Torvalds
 * Copyright (C) 2001 - 2005  Tensilica Inc.
 * Copyright (C) 2014 - 2016  Cadence Design Systems Inc.
 *
 * Chris Zankel	<chris@zankel.net>
 * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
 * Kevin Chea
 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/screen_info.h>
#include <linux/kernel.h>
#include <linux/percpu.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/of_fdt.h>

#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
# include <linux/console.h>
#endif

#ifdef CONFIG_PROC_FS
# include <linux/seq_file.h>
#endif

#include <asm/bootparam.h>
#include <asm/kasan.h>
#include <asm/mmu_context.h>
#include <asm/processor.h>
#include <asm/timex.h>
#include <asm/platform.h>
#include <asm/page.h>
#include <asm/setup.h>
#include <asm/param.h>
#include <asm/smp.h>
#include <asm/sysmem.h>

#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
struct screen_info screen_info = {
	.orig_x = 0,
	.orig_y = 24,
	.orig_video_cols = 80,
	.orig_video_lines = 24,
	.orig_video_isVGA = 1,
	.orig_video_points = 16,
};
#endif

#ifdef CONFIG_BLK_DEV_INITRD
extern unsigned long initrd_start;
extern unsigned long initrd_end;
extern int initrd_below_start_ok;
#endif

#ifdef CONFIG_OF
void *dtb_start = __dtb_start;
#endif

extern unsigned long loops_per_jiffy;

/* Command line specified as configuration option. */

static char __initdata command_line[COMMAND_LINE_SIZE];

#ifdef CONFIG_CMDLINE_BOOL
static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
#endif

#ifdef CONFIG_PARSE_BOOTPARAM
/*
 * Boot parameter parsing.
 *
 * The Xtensa port uses a list of variable-sized tags to pass data to
 * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
 * to be recognised. The list is terminated with a zero-sized
 * BP_TAG_LAST tag.
 */

typedef struct tagtable {
	u32 tag;
	int (*parse)(const bp_tag_t*);
} tagtable_t;

#define __tagtable(tag, fn) static tagtable_t __tagtable_##fn 		\
	__attribute__((used, section(".taglist"))) = { tag, fn }

/* parse current tag */

static int __init parse_tag_mem(const bp_tag_t *tag)
{
	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);

	if (mi->type != MEMORY_TYPE_CONVENTIONAL)
		return -1;

	return memblock_add(mi->start, mi->end - mi->start);
}

__tagtable(BP_TAG_MEMORY, parse_tag_mem);

#ifdef CONFIG_BLK_DEV_INITRD

static int __init parse_tag_initrd(const bp_tag_t* tag)
{
	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);

	initrd_start = (unsigned long)__va(mi->start);
	initrd_end = (unsigned long)__va(mi->end);

	return 0;
}

__tagtable(BP_TAG_INITRD, parse_tag_initrd);

#endif /* CONFIG_BLK_DEV_INITRD */

#ifdef CONFIG_OF

static int __init parse_tag_fdt(const bp_tag_t *tag)
{
	dtb_start = __va(tag->data[0]);
	return 0;
}

__tagtable(BP_TAG_FDT, parse_tag_fdt);

#endif /* CONFIG_OF */

static int __init parse_tag_cmdline(const bp_tag_t* tag)
{
	strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
	return 0;
}

__tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);

static int __init parse_bootparam(const bp_tag_t* tag)
{
	extern tagtable_t __tagtable_begin, __tagtable_end;
	tagtable_t *t;

	/* Boot parameters must start with a BP_TAG_FIRST tag. */

	if (tag->id != BP_TAG_FIRST) {
		pr_warn("Invalid boot parameters!\n");
		return 0;
	}

	tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);

	/* Parse all tags. */

	while (tag != NULL && tag->id != BP_TAG_LAST) {
		for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
			if (tag->id == t->tag) {
				t->parse(tag);
				break;
			}
		}
		if (t == &__tagtable_end)
			pr_warn("Ignoring tag 0x%08x\n", tag->id);
		tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
	}

	return 0;
}
#else
static int __init parse_bootparam(const bp_tag_t *tag)
{
	pr_info("Ignoring boot parameters at %p\n", tag);
	return 0;
}
#endif

#ifdef CONFIG_OF

#if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
EXPORT_SYMBOL(xtensa_kio_paddr);

static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
		int depth, void *data)
{
	const __be32 *ranges;
	int len;

	if (depth > 1)
		return 0;

	if (!of_flat_dt_is_compatible(node, "simple-bus"))
		return 0;

	ranges = of_get_flat_dt_prop(node, "ranges", &len);
	if (!ranges)
		return 1;
	if (len == 0)
		return 1;

	xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
	/* round down to nearest 256MB boundary */
	xtensa_kio_paddr &= 0xf0000000;

	init_kio();

	return 1;
}
#else
static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
		int depth, void *data)
{
	return 1;
}
#endif

void __init early_init_devtree(void *params)
{
	early_init_dt_scan(params);
	of_scan_flat_dt(xtensa_dt_io_area, NULL);

	if (!command_line[0])
		strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
}

#endif /* CONFIG_OF */

/*
 * Initialize architecture. (Early stage)
 */

void __init init_arch(bp_tag_t *bp_start)
{
	/* Initialize MMU. */

	init_mmu();

	/* Initialize initial KASAN shadow map */

	kasan_early_init();

	/* Parse boot parameters */

	if (bp_start)
		parse_bootparam(bp_start);

#ifdef CONFIG_OF
	early_init_devtree(dtb_start);
#endif

#ifdef CONFIG_CMDLINE_BOOL
	if (!command_line[0])
		strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
#endif

	/* Early hook for platforms */

	platform_init(bp_start);
}

/*
 * Initialize system. Setup memory and reserve regions.
 */

extern char _end[];
extern char _stext[];
extern char _WindowVectors_text_start;
extern char _WindowVectors_text_end;
extern char _DebugInterruptVector_text_start;
extern char _DebugInterruptVector_text_end;
extern char _KernelExceptionVector_text_start;
extern char _KernelExceptionVector_text_end;
extern char _UserExceptionVector_text_start;
extern char _UserExceptionVector_text_end;
extern char _DoubleExceptionVector_text_start;
extern char _DoubleExceptionVector_text_end;
extern char _exception_text_start;
extern char _exception_text_end;
#if XCHAL_EXCM_LEVEL >= 2
extern char _Level2InterruptVector_text_start;
extern char _Level2InterruptVector_text_end;
#endif
#if XCHAL_EXCM_LEVEL >= 3
extern char _Level3InterruptVector_text_start;
extern char _Level3InterruptVector_text_end;
#endif
#if XCHAL_EXCM_LEVEL >= 4
extern char _Level4InterruptVector_text_start;
extern char _Level4InterruptVector_text_end;
#endif
#if XCHAL_EXCM_LEVEL >= 5
extern char _Level5InterruptVector_text_start;
extern char _Level5InterruptVector_text_end;
#endif
#if XCHAL_EXCM_LEVEL >= 6
extern char _Level6InterruptVector_text_start;
extern char _Level6InterruptVector_text_end;
#endif
#ifdef CONFIG_SMP
extern char _SecondaryResetVector_text_start;
extern char _SecondaryResetVector_text_end;
#endif
#ifdef CONFIG_XIP_KERNEL
extern char _xip_start[];
extern char _xip_end[];
#endif

static inline int __init_memblock mem_reserve(unsigned long start,
					      unsigned long end)
{
	return memblock_reserve(start, end - start);
}

void __init setup_arch(char **cmdline_p)
{
	pr_info("config ID: %08x:%08x\n",
		xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE));
	if (xtensa_get_sr(SREG_EPC) != XCHAL_HW_CONFIGID0 ||
	    xtensa_get_sr(SREG_EXCSAVE) != XCHAL_HW_CONFIGID1)
		pr_info("built for config ID: %08x:%08x\n",
			XCHAL_HW_CONFIGID0, XCHAL_HW_CONFIGID1);

	*cmdline_p = command_line;
	platform_setup(cmdline_p);
	strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);

	/* Reserve some memory regions */

#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start < initrd_end &&
	    !mem_reserve(__pa(initrd_start), __pa(initrd_end)))
		initrd_below_start_ok = 1;
	else
		initrd_start = 0;
#endif

	mem_reserve(__pa(_stext), __pa(_end));
#ifdef CONFIG_XIP_KERNEL
	mem_reserve(__pa(_xip_start), __pa(_xip_end));
#endif

#ifdef CONFIG_VECTORS_ADDR
	mem_reserve(__pa(&_WindowVectors_text_start),
		    __pa(&_WindowVectors_text_end));

	mem_reserve(__pa(&_DebugInterruptVector_text_start),
		    __pa(&_DebugInterruptVector_text_end));

	mem_reserve(__pa(&_KernelExceptionVector_text_start),
		    __pa(&_KernelExceptionVector_text_end));

	mem_reserve(__pa(&_UserExceptionVector_text_start),
		    __pa(&_UserExceptionVector_text_end));

	mem_reserve(__pa(&_DoubleExceptionVector_text_start),
		    __pa(&_DoubleExceptionVector_text_end));

	mem_reserve(__pa(&_exception_text_start),
		    __pa(&_exception_text_end));
#if XCHAL_EXCM_LEVEL >= 2
	mem_reserve(__pa(&_Level2InterruptVector_text_start),
		    __pa(&_Level2InterruptVector_text_end));
#endif
#if XCHAL_EXCM_LEVEL >= 3
	mem_reserve(__pa(&_Level3InterruptVector_text_start),
		    __pa(&_Level3InterruptVector_text_end));
#endif
#if XCHAL_EXCM_LEVEL >= 4
	mem_reserve(__pa(&_Level4InterruptVector_text_start),
		    __pa(&_Level4InterruptVector_text_end));
#endif
#if XCHAL_EXCM_LEVEL >= 5
	mem_reserve(__pa(&_Level5InterruptVector_text_start),
		    __pa(&_Level5InterruptVector_text_end));
#endif
#if XCHAL_EXCM_LEVEL >= 6
	mem_reserve(__pa(&_Level6InterruptVector_text_start),
		    __pa(&_Level6InterruptVector_text_end));
#endif

#endif /* CONFIG_VECTORS_ADDR */

#ifdef CONFIG_SMP
	mem_reserve(__pa(&_SecondaryResetVector_text_start),
		    __pa(&_SecondaryResetVector_text_end));
#endif
	parse_early_param();
	bootmem_init();
	kasan_init();
	unflatten_and_copy_device_tree();

#ifdef CONFIG_SMP
	smp_init_cpus();
#endif

	paging_init();
	zones_init();

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

static DEFINE_PER_CPU(struct cpu, cpu_data);

static int __init topology_init(void)
{
	int i;

	for_each_possible_cpu(i) {
		struct cpu *cpu = &per_cpu(cpu_data, i);
		cpu->hotpluggable = !!i;
		register_cpu(cpu, i);
	}

	return 0;
}
subsys_initcall(topology_init);

void cpu_reset(void)
{
#if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
	local_irq_disable();
	/*
	 * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
	 * be flushed.
	 * Way 4 is not currently used by linux.
	 * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
	 * Way 5 shall be flushed and way 6 shall be set to identity mapping
	 * on MMUv3.
	 */
	local_flush_tlb_all();
	invalidate_page_directory();
#if XCHAL_HAVE_SPANNING_WAY
	/* MMU v3 */
	{
		unsigned long vaddr = (unsigned long)cpu_reset;
		unsigned long paddr = __pa(vaddr);
		unsigned long tmpaddr = vaddr + SZ_512M;
		unsigned long tmp0, tmp1, tmp2, tmp3;

		/*
		 * Find a place for the temporary mapping. It must not be
		 * in the same 512MB region with vaddr or paddr, otherwise
		 * there may be multihit exception either on entry to the
		 * temporary mapping, or on entry to the identity mapping.
		 * (512MB is the biggest page size supported by TLB.)
		 */
		while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
			tmpaddr += SZ_512M;

		/* Invalidate mapping in the selected temporary area */
		if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
			invalidate_itlb_entry(itlb_probe(tmpaddr));
		if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
			invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));

		/*
		 * Map two consecutive pages starting at the physical address
		 * of this function to the temporary mapping area.
		 */
		write_itlb_entry(__pte((paddr & PAGE_MASK) |
				       _PAGE_HW_VALID |
				       _PAGE_HW_EXEC |
				       _PAGE_CA_BYPASS),
				 tmpaddr & PAGE_MASK);
		write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
				       _PAGE_HW_VALID |
				       _PAGE_HW_EXEC |
				       _PAGE_CA_BYPASS),
				 (tmpaddr & PAGE_MASK) + PAGE_SIZE);

		/* Reinitialize TLB */
		__asm__ __volatile__ ("movi	%0, 1f\n\t"
				      "movi	%3, 2f\n\t"
				      "add	%0, %0, %4\n\t"
				      "add	%3, %3, %5\n\t"
				      "jx	%0\n"
				      /*
				       * No literal, data or stack access
				       * below this point
				       */
				      "1:\n\t"
				      /* Initialize *tlbcfg */
				      "movi	%0, 0\n\t"
				      "wsr	%0, itlbcfg\n\t"
				      "wsr	%0, dtlbcfg\n\t"
				      /* Invalidate TLB way 5 */
				      "movi	%0, 4\n\t"
				      "movi	%1, 5\n"
				      "1:\n\t"
				      "iitlb	%1\n\t"
				      "idtlb	%1\n\t"
				      "add	%1, %1, %6\n\t"
				      "addi	%0, %0, -1\n\t"
				      "bnez	%0, 1b\n\t"
				      /* Initialize TLB way 6 */
				      "movi	%0, 7\n\t"
				      "addi	%1, %9, 3\n\t"
				      "addi	%2, %9, 6\n"
				      "1:\n\t"
				      "witlb	%1, %2\n\t"
				      "wdtlb	%1, %2\n\t"
				      "add	%1, %1, %7\n\t"
				      "add	%2, %2, %7\n\t"
				      "addi	%0, %0, -1\n\t"
				      "bnez	%0, 1b\n\t"
				      "isync\n\t"
				      /* Jump to identity mapping */
				      "jx	%3\n"
				      "2:\n\t"
				      /* Complete way 6 initialization */
				      "witlb	%1, %2\n\t"
				      "wdtlb	%1, %2\n\t"
				      /* Invalidate temporary mapping */
				      "sub	%0, %9, %7\n\t"
				      "iitlb	%0\n\t"
				      "add	%0, %0, %8\n\t"
				      "iitlb	%0"
				      : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
					"=&a"(tmp3)
				      : "a"(tmpaddr - vaddr),
					"a"(paddr - vaddr),
					"a"(SZ_128M), "a"(SZ_512M),
					"a"(PAGE_SIZE),
					"a"((tmpaddr + SZ_512M) & PAGE_MASK)
				      : "memory");
	}
#endif
#endif
	__asm__ __volatile__ ("movi	a2, 0\n\t"
			      "wsr	a2, icountlevel\n\t"
			      "movi	a2, 0\n\t"
			      "wsr	a2, icount\n\t"
#if XCHAL_NUM_IBREAK > 0
			      "wsr	a2, ibreakenable\n\t"
#endif
#if XCHAL_HAVE_LOOPS
			      "wsr	a2, lcount\n\t"
#endif
			      "movi	a2, 0x1f\n\t"
			      "wsr	a2, ps\n\t"
			      "isync\n\t"
			      "jx	%0\n\t"
			      :
			      : "a" (XCHAL_RESET_VECTOR_VADDR)
			      : "a2");
	for (;;)
		;
}

void machine_restart(char * cmd)
{
	platform_restart();
}

void machine_halt(void)
{
	platform_halt();
	while (1);
}

void machine_power_off(void)
{
	platform_power_off();
	while (1);
}
#ifdef CONFIG_PROC_FS

/*
 * Display some core information through /proc/cpuinfo.
 */

static int
c_show(struct seq_file *f, void *slot)
{
	/* high-level stuff */
	seq_printf(f, "CPU count\t: %u\n"
		      "CPU list\t: %*pbl\n"
		      "vendor_id\t: Tensilica\n"
		      "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
		      "core ID\t\t: " XCHAL_CORE_ID "\n"
		      "build ID\t: 0x%x\n"
		      "config ID\t: %08x:%08x\n"
		      "byte order\t: %s\n"
		      "cpu MHz\t\t: %lu.%02lu\n"
		      "bogomips\t: %lu.%02lu\n",
		      num_online_cpus(),
		      cpumask_pr_args(cpu_online_mask),
		      XCHAL_BUILD_UNIQUE_ID,
		      xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE),
		      XCHAL_HAVE_BE ?  "big" : "little",
		      ccount_freq/1000000,
		      (ccount_freq/10000) % 100,
		      loops_per_jiffy/(500000/HZ),
		      (loops_per_jiffy/(5000/HZ)) % 100);
	seq_puts(f, "flags\t\t: "
#if XCHAL_HAVE_NMI
		     "nmi "
#endif
#if XCHAL_HAVE_DEBUG
		     "debug "
# if XCHAL_HAVE_OCD
		     "ocd "
# endif
#endif
#if XCHAL_HAVE_DENSITY
	    	     "density "
#endif
#if XCHAL_HAVE_BOOLEANS
		     "boolean "
#endif
#if XCHAL_HAVE_LOOPS
		     "loop "
#endif
#if XCHAL_HAVE_NSA
		     "nsa "
#endif
#if XCHAL_HAVE_MINMAX
		     "minmax "
#endif
#if XCHAL_HAVE_SEXT
		     "sext "
#endif
#if XCHAL_HAVE_CLAMPS
		     "clamps "
#endif
#if XCHAL_HAVE_MAC16
		     "mac16 "
#endif
#if XCHAL_HAVE_MUL16
		     "mul16 "
#endif
#if XCHAL_HAVE_MUL32
		     "mul32 "
#endif
#if XCHAL_HAVE_MUL32_HIGH
		     "mul32h "
#endif
#if XCHAL_HAVE_FP
		     "fpu "
#endif
#if XCHAL_HAVE_S32C1I
		     "s32c1i "
#endif
#if XCHAL_HAVE_EXCLUSIVE
		     "exclusive "
#endif
		     "\n");

	/* Registers. */
	seq_printf(f,"physical aregs\t: %d\n"
		     "misc regs\t: %d\n"
		     "ibreak\t\t: %d\n"
		     "dbreak\t\t: %d\n",
		     XCHAL_NUM_AREGS,
		     XCHAL_NUM_MISC_REGS,
		     XCHAL_NUM_IBREAK,
		     XCHAL_NUM_DBREAK);


	/* Interrupt. */
	seq_printf(f,"num ints\t: %d\n"
		     "ext ints\t: %d\n"
		     "int levels\t: %d\n"
		     "timers\t\t: %d\n"
		     "debug level\t: %d\n",
		     XCHAL_NUM_INTERRUPTS,
		     XCHAL_NUM_EXTINTERRUPTS,
		     XCHAL_NUM_INTLEVELS,
		     XCHAL_NUM_TIMERS,
		     XCHAL_DEBUGLEVEL);

	/* Cache */
	seq_printf(f,"icache line size: %d\n"
		     "icache ways\t: %d\n"
		     "icache size\t: %d\n"
		     "icache flags\t: "
#if XCHAL_ICACHE_LINE_LOCKABLE
		     "lock "
#endif
		     "\n"
		     "dcache line size: %d\n"
		     "dcache ways\t: %d\n"
		     "dcache size\t: %d\n"
		     "dcache flags\t: "
#if XCHAL_DCACHE_IS_WRITEBACK
		     "writeback "
#endif
#if XCHAL_DCACHE_LINE_LOCKABLE
		     "lock "
#endif
		     "\n",
		     XCHAL_ICACHE_LINESIZE,
		     XCHAL_ICACHE_WAYS,
		     XCHAL_ICACHE_SIZE,
		     XCHAL_DCACHE_LINESIZE,
		     XCHAL_DCACHE_WAYS,
		     XCHAL_DCACHE_SIZE);

	return 0;
}

/*
 * We show only CPU #0 info.
 */
static void *
c_start(struct seq_file *f, loff_t *pos)
{
	return (*pos == 0) ? (void *)1 : NULL;
}

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

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

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

#endif /* CONFIG_PROC_FS */