xref: /openbmc/linux/arch/xtensa/kernel/setup.c (revision f66501dc) 
1 /*
2  * arch/xtensa/kernel/setup.c
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License.  See the file "COPYING" in the main directory of this archive
6  * for more details.
7  *
8  * Copyright (C) 1995  Linus Torvalds
9  * Copyright (C) 2001 - 2005  Tensilica Inc.
10  * Copyright (C) 2014 - 2016  Cadence Design Systems Inc.
11  *
12  * Chris Zankel	<chris@zankel.net>
13  * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
14  * Kevin Chea
15  * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
16  */
17 
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/mm.h>
21 #include <linux/proc_fs.h>
22 #include <linux/screen_info.h>
23 #include <linux/kernel.h>
24 #include <linux/percpu.h>
25 #include <linux/cpu.h>
26 #include <linux/of.h>
27 #include <linux/of_fdt.h>
28 
29 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
30 # include <linux/console.h>
31 #endif
32 
33 #ifdef CONFIG_PROC_FS
34 # include <linux/seq_file.h>
35 #endif
36 
37 #include <asm/bootparam.h>
38 #include <asm/kasan.h>
39 #include <asm/mmu_context.h>
40 #include <asm/pgtable.h>
41 #include <asm/processor.h>
42 #include <asm/timex.h>
43 #include <asm/platform.h>
44 #include <asm/page.h>
45 #include <asm/setup.h>
46 #include <asm/param.h>
47 #include <asm/smp.h>
48 #include <asm/sysmem.h>
49 
50 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
51 struct screen_info screen_info = {
52 	.orig_x = 0,
53 	.orig_y = 24,
54 	.orig_video_cols = 80,
55 	.orig_video_lines = 24,
56 	.orig_video_isVGA = 1,
57 	.orig_video_points = 16,
58 };
59 #endif
60 
61 #ifdef CONFIG_BLK_DEV_INITRD
62 extern unsigned long initrd_start;
63 extern unsigned long initrd_end;
64 int initrd_is_mapped = 0;
65 extern int initrd_below_start_ok;
66 #endif
67 
68 #ifdef CONFIG_OF
69 void *dtb_start = __dtb_start;
70 #endif
71 
72 extern unsigned long loops_per_jiffy;
73 
74 /* Command line specified as configuration option. */
75 
76 static char __initdata command_line[COMMAND_LINE_SIZE];
77 
78 #ifdef CONFIG_CMDLINE_BOOL
79 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
80 #endif
81 
82 #ifdef CONFIG_PARSE_BOOTPARAM
83 /*
84  * Boot parameter parsing.
85  *
86  * The Xtensa port uses a list of variable-sized tags to pass data to
87  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
88  * to be recognised. The list is terminated with a zero-sized
89  * BP_TAG_LAST tag.
90  */
91 
92 typedef struct tagtable {
93 	u32 tag;
94 	int (*parse)(const bp_tag_t*);
95 } tagtable_t;
96 
97 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn 		\
98 	__attribute__((used, section(".taglist"))) = { tag, fn }
99 
100 /* parse current tag */
101 
102 static int __init parse_tag_mem(const bp_tag_t *tag)
103 {
104 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
105 
106 	if (mi->type != MEMORY_TYPE_CONVENTIONAL)
107 		return -1;
108 
109 	return memblock_add(mi->start, mi->end - mi->start);
110 }
111 
112 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
113 
114 #ifdef CONFIG_BLK_DEV_INITRD
115 
116 static int __init parse_tag_initrd(const bp_tag_t* tag)
117 {
118 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
119 
120 	initrd_start = (unsigned long)__va(mi->start);
121 	initrd_end = (unsigned long)__va(mi->end);
122 
123 	return 0;
124 }
125 
126 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
127 
128 #endif /* CONFIG_BLK_DEV_INITRD */
129 
130 #ifdef CONFIG_OF
131 
132 static int __init parse_tag_fdt(const bp_tag_t *tag)
133 {
134 	dtb_start = __va(tag->data[0]);
135 	return 0;
136 }
137 
138 __tagtable(BP_TAG_FDT, parse_tag_fdt);
139 
140 #endif /* CONFIG_OF */
141 
142 static int __init parse_tag_cmdline(const bp_tag_t* tag)
143 {
144 	strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
145 	return 0;
146 }
147 
148 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
149 
150 static int __init parse_bootparam(const bp_tag_t* tag)
151 {
152 	extern tagtable_t __tagtable_begin, __tagtable_end;
153 	tagtable_t *t;
154 
155 	/* Boot parameters must start with a BP_TAG_FIRST tag. */
156 
157 	if (tag->id != BP_TAG_FIRST) {
158 		pr_warn("Invalid boot parameters!\n");
159 		return 0;
160 	}
161 
162 	tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
163 
164 	/* Parse all tags. */
165 
166 	while (tag != NULL && tag->id != BP_TAG_LAST) {
167 		for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
168 			if (tag->id == t->tag) {
169 				t->parse(tag);
170 				break;
171 			}
172 		}
173 		if (t == &__tagtable_end)
174 			pr_warn("Ignoring tag 0x%08x\n", tag->id);
175 		tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
176 	}
177 
178 	return 0;
179 }
180 #else
181 static int __init parse_bootparam(const bp_tag_t *tag)
182 {
183 	pr_info("Ignoring boot parameters at %p\n", tag);
184 	return 0;
185 }
186 #endif
187 
188 #ifdef CONFIG_OF
189 
190 #if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
191 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
192 EXPORT_SYMBOL(xtensa_kio_paddr);
193 
194 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
195 		int depth, void *data)
196 {
197 	const __be32 *ranges;
198 	int len;
199 
200 	if (depth > 1)
201 		return 0;
202 
203 	if (!of_flat_dt_is_compatible(node, "simple-bus"))
204 		return 0;
205 
206 	ranges = of_get_flat_dt_prop(node, "ranges", &len);
207 	if (!ranges)
208 		return 1;
209 	if (len == 0)
210 		return 1;
211 
212 	xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
213 	/* round down to nearest 256MB boundary */
214 	xtensa_kio_paddr &= 0xf0000000;
215 
216 	init_kio();
217 
218 	return 1;
219 }
220 #else
221 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
222 		int depth, void *data)
223 {
224 	return 1;
225 }
226 #endif
227 
228 void __init early_init_devtree(void *params)
229 {
230 	early_init_dt_scan(params);
231 	of_scan_flat_dt(xtensa_dt_io_area, NULL);
232 
233 	if (!command_line[0])
234 		strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
235 }
236 
237 #endif /* CONFIG_OF */
238 
239 /*
240  * Initialize architecture. (Early stage)
241  */
242 
243 void __init init_arch(bp_tag_t *bp_start)
244 {
245 	/* Initialize MMU. */
246 
247 	init_mmu();
248 
249 	/* Initialize initial KASAN shadow map */
250 
251 	kasan_early_init();
252 
253 	/* Parse boot parameters */
254 
255 	if (bp_start)
256 		parse_bootparam(bp_start);
257 
258 #ifdef CONFIG_OF
259 	early_init_devtree(dtb_start);
260 #endif
261 
262 #ifdef CONFIG_CMDLINE_BOOL
263 	if (!command_line[0])
264 		strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
265 #endif
266 
267 	/* Early hook for platforms */
268 
269 	platform_init(bp_start);
270 }
271 
272 /*
273  * Initialize system. Setup memory and reserve regions.
274  */
275 
276 extern char _end[];
277 extern char _stext[];
278 extern char _WindowVectors_text_start;
279 extern char _WindowVectors_text_end;
280 extern char _DebugInterruptVector_text_start;
281 extern char _DebugInterruptVector_text_end;
282 extern char _KernelExceptionVector_text_start;
283 extern char _KernelExceptionVector_text_end;
284 extern char _UserExceptionVector_text_start;
285 extern char _UserExceptionVector_text_end;
286 extern char _DoubleExceptionVector_text_start;
287 extern char _DoubleExceptionVector_text_end;
288 #if XCHAL_EXCM_LEVEL >= 2
289 extern char _Level2InterruptVector_text_start;
290 extern char _Level2InterruptVector_text_end;
291 #endif
292 #if XCHAL_EXCM_LEVEL >= 3
293 extern char _Level3InterruptVector_text_start;
294 extern char _Level3InterruptVector_text_end;
295 #endif
296 #if XCHAL_EXCM_LEVEL >= 4
297 extern char _Level4InterruptVector_text_start;
298 extern char _Level4InterruptVector_text_end;
299 #endif
300 #if XCHAL_EXCM_LEVEL >= 5
301 extern char _Level5InterruptVector_text_start;
302 extern char _Level5InterruptVector_text_end;
303 #endif
304 #if XCHAL_EXCM_LEVEL >= 6
305 extern char _Level6InterruptVector_text_start;
306 extern char _Level6InterruptVector_text_end;
307 #endif
308 #ifdef CONFIG_SMP
309 extern char _SecondaryResetVector_text_start;
310 extern char _SecondaryResetVector_text_end;
311 #endif
312 
313 static inline int __init_memblock mem_reserve(unsigned long start,
314 					      unsigned long end)
315 {
316 	return memblock_reserve(start, end - start);
317 }
318 
319 void __init setup_arch(char **cmdline_p)
320 {
321 	pr_info("config ID: %08x:%08x\n",
322 		xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE));
323 	if (xtensa_get_sr(SREG_EPC) != XCHAL_HW_CONFIGID0 ||
324 	    xtensa_get_sr(SREG_EXCSAVE) != XCHAL_HW_CONFIGID1)
325 		pr_info("built for config ID: %08x:%08x\n",
326 			XCHAL_HW_CONFIGID0, XCHAL_HW_CONFIGID1);
327 
328 	*cmdline_p = command_line;
329 	platform_setup(cmdline_p);
330 	strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
331 
332 	/* Reserve some memory regions */
333 
334 #ifdef CONFIG_BLK_DEV_INITRD
335 	if (initrd_start < initrd_end) {
336 		initrd_is_mapped = mem_reserve(__pa(initrd_start),
337 					       __pa(initrd_end)) == 0;
338 		initrd_below_start_ok = 1;
339 	} else {
340 		initrd_start = 0;
341 	}
342 #endif
343 
344 	mem_reserve(__pa(_stext), __pa(_end));
345 
346 #ifdef CONFIG_VECTORS_OFFSET
347 	mem_reserve(__pa(&_WindowVectors_text_start),
348 		    __pa(&_WindowVectors_text_end));
349 
350 	mem_reserve(__pa(&_DebugInterruptVector_text_start),
351 		    __pa(&_DebugInterruptVector_text_end));
352 
353 	mem_reserve(__pa(&_KernelExceptionVector_text_start),
354 		    __pa(&_KernelExceptionVector_text_end));
355 
356 	mem_reserve(__pa(&_UserExceptionVector_text_start),
357 		    __pa(&_UserExceptionVector_text_end));
358 
359 	mem_reserve(__pa(&_DoubleExceptionVector_text_start),
360 		    __pa(&_DoubleExceptionVector_text_end));
361 
362 #if XCHAL_EXCM_LEVEL >= 2
363 	mem_reserve(__pa(&_Level2InterruptVector_text_start),
364 		    __pa(&_Level2InterruptVector_text_end));
365 #endif
366 #if XCHAL_EXCM_LEVEL >= 3
367 	mem_reserve(__pa(&_Level3InterruptVector_text_start),
368 		    __pa(&_Level3InterruptVector_text_end));
369 #endif
370 #if XCHAL_EXCM_LEVEL >= 4
371 	mem_reserve(__pa(&_Level4InterruptVector_text_start),
372 		    __pa(&_Level4InterruptVector_text_end));
373 #endif
374 #if XCHAL_EXCM_LEVEL >= 5
375 	mem_reserve(__pa(&_Level5InterruptVector_text_start),
376 		    __pa(&_Level5InterruptVector_text_end));
377 #endif
378 #if XCHAL_EXCM_LEVEL >= 6
379 	mem_reserve(__pa(&_Level6InterruptVector_text_start),
380 		    __pa(&_Level6InterruptVector_text_end));
381 #endif
382 
383 #endif /* CONFIG_VECTORS_OFFSET */
384 
385 #ifdef CONFIG_SMP
386 	mem_reserve(__pa(&_SecondaryResetVector_text_start),
387 		    __pa(&_SecondaryResetVector_text_end));
388 #endif
389 	parse_early_param();
390 	bootmem_init();
391 	kasan_init();
392 	unflatten_and_copy_device_tree();
393 
394 #ifdef CONFIG_SMP
395 	smp_init_cpus();
396 #endif
397 
398 	paging_init();
399 	zones_init();
400 
401 #ifdef CONFIG_VT
402 # if defined(CONFIG_VGA_CONSOLE)
403 	conswitchp = &vga_con;
404 # elif defined(CONFIG_DUMMY_CONSOLE)
405 	conswitchp = &dummy_con;
406 # endif
407 #endif
408 
409 #ifdef CONFIG_PCI
410 	platform_pcibios_init();
411 #endif
412 }
413 
414 static DEFINE_PER_CPU(struct cpu, cpu_data);
415 
416 static int __init topology_init(void)
417 {
418 	int i;
419 
420 	for_each_possible_cpu(i) {
421 		struct cpu *cpu = &per_cpu(cpu_data, i);
422 		cpu->hotpluggable = !!i;
423 		register_cpu(cpu, i);
424 	}
425 
426 	return 0;
427 }
428 subsys_initcall(topology_init);
429 
430 void cpu_reset(void)
431 {
432 #if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
433 	local_irq_disable();
434 	/*
435 	 * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
436 	 * be flushed.
437 	 * Way 4 is not currently used by linux.
438 	 * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
439 	 * Way 5 shall be flushed and way 6 shall be set to identity mapping
440 	 * on MMUv3.
441 	 */
442 	local_flush_tlb_all();
443 	invalidate_page_directory();
444 #if XCHAL_HAVE_SPANNING_WAY
445 	/* MMU v3 */
446 	{
447 		unsigned long vaddr = (unsigned long)cpu_reset;
448 		unsigned long paddr = __pa(vaddr);
449 		unsigned long tmpaddr = vaddr + SZ_512M;
450 		unsigned long tmp0, tmp1, tmp2, tmp3;
451 
452 		/*
453 		 * Find a place for the temporary mapping. It must not be
454 		 * in the same 512MB region with vaddr or paddr, otherwise
455 		 * there may be multihit exception either on entry to the
456 		 * temporary mapping, or on entry to the identity mapping.
457 		 * (512MB is the biggest page size supported by TLB.)
458 		 */
459 		while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
460 			tmpaddr += SZ_512M;
461 
462 		/* Invalidate mapping in the selected temporary area */
463 		if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
464 			invalidate_itlb_entry(itlb_probe(tmpaddr));
465 		if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
466 			invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
467 
468 		/*
469 		 * Map two consecutive pages starting at the physical address
470 		 * of this function to the temporary mapping area.
471 		 */
472 		write_itlb_entry(__pte((paddr & PAGE_MASK) |
473 				       _PAGE_HW_VALID |
474 				       _PAGE_HW_EXEC |
475 				       _PAGE_CA_BYPASS),
476 				 tmpaddr & PAGE_MASK);
477 		write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
478 				       _PAGE_HW_VALID |
479 				       _PAGE_HW_EXEC |
480 				       _PAGE_CA_BYPASS),
481 				 (tmpaddr & PAGE_MASK) + PAGE_SIZE);
482 
483 		/* Reinitialize TLB */
484 		__asm__ __volatile__ ("movi	%0, 1f\n\t"
485 				      "movi	%3, 2f\n\t"
486 				      "add	%0, %0, %4\n\t"
487 				      "add	%3, %3, %5\n\t"
488 				      "jx	%0\n"
489 				      /*
490 				       * No literal, data or stack access
491 				       * below this point
492 				       */
493 				      "1:\n\t"
494 				      /* Initialize *tlbcfg */
495 				      "movi	%0, 0\n\t"
496 				      "wsr	%0, itlbcfg\n\t"
497 				      "wsr	%0, dtlbcfg\n\t"
498 				      /* Invalidate TLB way 5 */
499 				      "movi	%0, 4\n\t"
500 				      "movi	%1, 5\n"
501 				      "1:\n\t"
502 				      "iitlb	%1\n\t"
503 				      "idtlb	%1\n\t"
504 				      "add	%1, %1, %6\n\t"
505 				      "addi	%0, %0, -1\n\t"
506 				      "bnez	%0, 1b\n\t"
507 				      /* Initialize TLB way 6 */
508 				      "movi	%0, 7\n\t"
509 				      "addi	%1, %9, 3\n\t"
510 				      "addi	%2, %9, 6\n"
511 				      "1:\n\t"
512 				      "witlb	%1, %2\n\t"
513 				      "wdtlb	%1, %2\n\t"
514 				      "add	%1, %1, %7\n\t"
515 				      "add	%2, %2, %7\n\t"
516 				      "addi	%0, %0, -1\n\t"
517 				      "bnez	%0, 1b\n\t"
518 				      /* Jump to identity mapping */
519 				      "jx	%3\n"
520 				      "2:\n\t"
521 				      /* Complete way 6 initialization */
522 				      "witlb	%1, %2\n\t"
523 				      "wdtlb	%1, %2\n\t"
524 				      /* Invalidate temporary mapping */
525 				      "sub	%0, %9, %7\n\t"
526 				      "iitlb	%0\n\t"
527 				      "add	%0, %0, %8\n\t"
528 				      "iitlb	%0"
529 				      : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
530 					"=&a"(tmp3)
531 				      : "a"(tmpaddr - vaddr),
532 					"a"(paddr - vaddr),
533 					"a"(SZ_128M), "a"(SZ_512M),
534 					"a"(PAGE_SIZE),
535 					"a"((tmpaddr + SZ_512M) & PAGE_MASK)
536 				      : "memory");
537 	}
538 #endif
539 #endif
540 	__asm__ __volatile__ ("movi	a2, 0\n\t"
541 			      "wsr	a2, icountlevel\n\t"
542 			      "movi	a2, 0\n\t"
543 			      "wsr	a2, icount\n\t"
544 #if XCHAL_NUM_IBREAK > 0
545 			      "wsr	a2, ibreakenable\n\t"
546 #endif
547 #if XCHAL_HAVE_LOOPS
548 			      "wsr	a2, lcount\n\t"
549 #endif
550 			      "movi	a2, 0x1f\n\t"
551 			      "wsr	a2, ps\n\t"
552 			      "isync\n\t"
553 			      "jx	%0\n\t"
554 			      :
555 			      : "a" (XCHAL_RESET_VECTOR_VADDR)
556 			      : "a2");
557 	for (;;)
558 		;
559 }
560 
561 void machine_restart(char * cmd)
562 {
563 	platform_restart();
564 }
565 
566 void machine_halt(void)
567 {
568 	platform_halt();
569 	while (1);
570 }
571 
572 void machine_power_off(void)
573 {
574 	platform_power_off();
575 	while (1);
576 }
577 #ifdef CONFIG_PROC_FS
578 
579 /*
580  * Display some core information through /proc/cpuinfo.
581  */
582 
583 static int
584 c_show(struct seq_file *f, void *slot)
585 {
586 	/* high-level stuff */
587 	seq_printf(f, "CPU count\t: %u\n"
588 		      "CPU list\t: %*pbl\n"
589 		      "vendor_id\t: Tensilica\n"
590 		      "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
591 		      "core ID\t\t: " XCHAL_CORE_ID "\n"
592 		      "build ID\t: 0x%x\n"
593 		      "config ID\t: %08x:%08x\n"
594 		      "byte order\t: %s\n"
595 		      "cpu MHz\t\t: %lu.%02lu\n"
596 		      "bogomips\t: %lu.%02lu\n",
597 		      num_online_cpus(),
598 		      cpumask_pr_args(cpu_online_mask),
599 		      XCHAL_BUILD_UNIQUE_ID,
600 		      xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE),
601 		      XCHAL_HAVE_BE ?  "big" : "little",
602 		      ccount_freq/1000000,
603 		      (ccount_freq/10000) % 100,
604 		      loops_per_jiffy/(500000/HZ),
605 		      (loops_per_jiffy/(5000/HZ)) % 100);
606 	seq_puts(f, "flags\t\t: "
607 #if XCHAL_HAVE_NMI
608 		     "nmi "
609 #endif
610 #if XCHAL_HAVE_DEBUG
611 		     "debug "
612 # if XCHAL_HAVE_OCD
613 		     "ocd "
614 # endif
615 #endif
616 #if XCHAL_HAVE_DENSITY
617 	    	     "density "
618 #endif
619 #if XCHAL_HAVE_BOOLEANS
620 		     "boolean "
621 #endif
622 #if XCHAL_HAVE_LOOPS
623 		     "loop "
624 #endif
625 #if XCHAL_HAVE_NSA
626 		     "nsa "
627 #endif
628 #if XCHAL_HAVE_MINMAX
629 		     "minmax "
630 #endif
631 #if XCHAL_HAVE_SEXT
632 		     "sext "
633 #endif
634 #if XCHAL_HAVE_CLAMPS
635 		     "clamps "
636 #endif
637 #if XCHAL_HAVE_MAC16
638 		     "mac16 "
639 #endif
640 #if XCHAL_HAVE_MUL16
641 		     "mul16 "
642 #endif
643 #if XCHAL_HAVE_MUL32
644 		     "mul32 "
645 #endif
646 #if XCHAL_HAVE_MUL32_HIGH
647 		     "mul32h "
648 #endif
649 #if XCHAL_HAVE_FP
650 		     "fpu "
651 #endif
652 #if XCHAL_HAVE_S32C1I
653 		     "s32c1i "
654 #endif
655 #if XCHAL_HAVE_EXCLUSIVE
656 		     "exclusive "
657 #endif
658 		     "\n");
659 
660 	/* Registers. */
661 	seq_printf(f,"physical aregs\t: %d\n"
662 		     "misc regs\t: %d\n"
663 		     "ibreak\t\t: %d\n"
664 		     "dbreak\t\t: %d\n",
665 		     XCHAL_NUM_AREGS,
666 		     XCHAL_NUM_MISC_REGS,
667 		     XCHAL_NUM_IBREAK,
668 		     XCHAL_NUM_DBREAK);
669 
670 
671 	/* Interrupt. */
672 	seq_printf(f,"num ints\t: %d\n"
673 		     "ext ints\t: %d\n"
674 		     "int levels\t: %d\n"
675 		     "timers\t\t: %d\n"
676 		     "debug level\t: %d\n",
677 		     XCHAL_NUM_INTERRUPTS,
678 		     XCHAL_NUM_EXTINTERRUPTS,
679 		     XCHAL_NUM_INTLEVELS,
680 		     XCHAL_NUM_TIMERS,
681 		     XCHAL_DEBUGLEVEL);
682 
683 	/* Cache */
684 	seq_printf(f,"icache line size: %d\n"
685 		     "icache ways\t: %d\n"
686 		     "icache size\t: %d\n"
687 		     "icache flags\t: "
688 #if XCHAL_ICACHE_LINE_LOCKABLE
689 		     "lock "
690 #endif
691 		     "\n"
692 		     "dcache line size: %d\n"
693 		     "dcache ways\t: %d\n"
694 		     "dcache size\t: %d\n"
695 		     "dcache flags\t: "
696 #if XCHAL_DCACHE_IS_WRITEBACK
697 		     "writeback "
698 #endif
699 #if XCHAL_DCACHE_LINE_LOCKABLE
700 		     "lock "
701 #endif
702 		     "\n",
703 		     XCHAL_ICACHE_LINESIZE,
704 		     XCHAL_ICACHE_WAYS,
705 		     XCHAL_ICACHE_SIZE,
706 		     XCHAL_DCACHE_LINESIZE,
707 		     XCHAL_DCACHE_WAYS,
708 		     XCHAL_DCACHE_SIZE);
709 
710 	return 0;
711 }
712 
713 /*
714  * We show only CPU #0 info.
715  */
716 static void *
717 c_start(struct seq_file *f, loff_t *pos)
718 {
719 	return (*pos == 0) ? (void *)1 : NULL;
720 }
721 
722 static void *
723 c_next(struct seq_file *f, void *v, loff_t *pos)
724 {
725 	return NULL;
726 }
727 
728 static void
729 c_stop(struct seq_file *f, void *v)
730 {
731 }
732 
733 const struct seq_operations cpuinfo_op =
734 {
735 	.start	= c_start,
736 	.next	= c_next,
737 	.stop	= c_stop,
738 	.show	= c_show,
739 };
740 
741 #endif /* CONFIG_PROC_FS */
742