xref: /openbmc/linux/arch/xtensa/kernel/setup.c (revision d9fd5a71) 
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/processor.h>
41 #include <asm/timex.h>
42 #include <asm/platform.h>
43 #include <asm/page.h>
44 #include <asm/setup.h>
45 #include <asm/param.h>
46 #include <asm/smp.h>
47 #include <asm/sysmem.h>
48 
49 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
50 struct screen_info screen_info = {
51 	.orig_x = 0,
52 	.orig_y = 24,
53 	.orig_video_cols = 80,
54 	.orig_video_lines = 24,
55 	.orig_video_isVGA = 1,
56 	.orig_video_points = 16,
57 };
58 #endif
59 
60 #ifdef CONFIG_BLK_DEV_INITRD
61 extern unsigned long initrd_start;
62 extern unsigned long initrd_end;
63 extern int initrd_below_start_ok;
64 #endif
65 
66 #ifdef CONFIG_OF
67 void *dtb_start = __dtb_start;
68 #endif
69 
70 extern unsigned long loops_per_jiffy;
71 
72 /* Command line specified as configuration option. */
73 
74 static char __initdata command_line[COMMAND_LINE_SIZE];
75 
76 #ifdef CONFIG_CMDLINE_BOOL
77 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
78 #endif
79 
80 #ifdef CONFIG_PARSE_BOOTPARAM
81 /*
82  * Boot parameter parsing.
83  *
84  * The Xtensa port uses a list of variable-sized tags to pass data to
85  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
86  * to be recognised. The list is terminated with a zero-sized
87  * BP_TAG_LAST tag.
88  */
89 
90 typedef struct tagtable {
91 	u32 tag;
92 	int (*parse)(const bp_tag_t*);
93 } tagtable_t;
94 
95 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn 		\
96 	__section(".taglist") __attribute__((used)) = { tag, fn }
97 
98 /* parse current tag */
99 
100 static int __init parse_tag_mem(const bp_tag_t *tag)
101 {
102 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
103 
104 	if (mi->type != MEMORY_TYPE_CONVENTIONAL)
105 		return -1;
106 
107 	return memblock_add(mi->start, mi->end - mi->start);
108 }
109 
110 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
111 
112 #ifdef CONFIG_BLK_DEV_INITRD
113 
114 static int __init parse_tag_initrd(const bp_tag_t* tag)
115 {
116 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
117 
118 	initrd_start = (unsigned long)__va(mi->start);
119 	initrd_end = (unsigned long)__va(mi->end);
120 
121 	return 0;
122 }
123 
124 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
125 
126 #endif /* CONFIG_BLK_DEV_INITRD */
127 
128 #ifdef CONFIG_OF
129 
130 static int __init parse_tag_fdt(const bp_tag_t *tag)
131 {
132 	dtb_start = __va(tag->data[0]);
133 	return 0;
134 }
135 
136 __tagtable(BP_TAG_FDT, parse_tag_fdt);
137 
138 #endif /* CONFIG_OF */
139 
140 static int __init parse_tag_cmdline(const bp_tag_t* tag)
141 {
142 	strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
143 	return 0;
144 }
145 
146 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
147 
148 static int __init parse_bootparam(const bp_tag_t* tag)
149 {
150 	extern tagtable_t __tagtable_begin, __tagtable_end;
151 	tagtable_t *t;
152 
153 	/* Boot parameters must start with a BP_TAG_FIRST tag. */
154 
155 	if (tag->id != BP_TAG_FIRST) {
156 		pr_warn("Invalid boot parameters!\n");
157 		return 0;
158 	}
159 
160 	tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
161 
162 	/* Parse all tags. */
163 
164 	while (tag != NULL && tag->id != BP_TAG_LAST) {
165 		for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
166 			if (tag->id == t->tag) {
167 				t->parse(tag);
168 				break;
169 			}
170 		}
171 		if (t == &__tagtable_end)
172 			pr_warn("Ignoring tag 0x%08x\n", tag->id);
173 		tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
174 	}
175 
176 	return 0;
177 }
178 #else
179 static int __init parse_bootparam(const bp_tag_t *tag)
180 {
181 	pr_info("Ignoring boot parameters at %p\n", tag);
182 	return 0;
183 }
184 #endif
185 
186 #ifdef CONFIG_OF
187 
188 #if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
189 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
190 EXPORT_SYMBOL(xtensa_kio_paddr);
191 
192 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
193 		int depth, void *data)
194 {
195 	const __be32 *ranges;
196 	int len;
197 
198 	if (depth > 1)
199 		return 0;
200 
201 	if (!of_flat_dt_is_compatible(node, "simple-bus"))
202 		return 0;
203 
204 	ranges = of_get_flat_dt_prop(node, "ranges", &len);
205 	if (!ranges)
206 		return 1;
207 	if (len == 0)
208 		return 1;
209 
210 	xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
211 	/* round down to nearest 256MB boundary */
212 	xtensa_kio_paddr &= 0xf0000000;
213 
214 	init_kio();
215 
216 	return 1;
217 }
218 #else
219 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
220 		int depth, void *data)
221 {
222 	return 1;
223 }
224 #endif
225 
226 void __init early_init_devtree(void *params)
227 {
228 	early_init_dt_scan(params);
229 	of_scan_flat_dt(xtensa_dt_io_area, NULL);
230 
231 	if (!command_line[0])
232 		strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
233 }
234 
235 #endif /* CONFIG_OF */
236 
237 /*
238  * Initialize architecture. (Early stage)
239  */
240 
241 void __init init_arch(bp_tag_t *bp_start)
242 {
243 	/* Initialize MMU. */
244 
245 	init_mmu();
246 
247 	/* Initialize initial KASAN shadow map */
248 
249 	kasan_early_init();
250 
251 	/* Parse boot parameters */
252 
253 	if (bp_start)
254 		parse_bootparam(bp_start);
255 
256 #ifdef CONFIG_OF
257 	early_init_devtree(dtb_start);
258 #endif
259 
260 #ifdef CONFIG_CMDLINE_BOOL
261 	if (!command_line[0])
262 		strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
263 #endif
264 
265 	/* Early hook for platforms */
266 
267 	platform_init(bp_start);
268 }
269 
270 /*
271  * Initialize system. Setup memory and reserve regions.
272  */
273 
274 extern char _end[];
275 extern char _stext[];
276 extern char _WindowVectors_text_start;
277 extern char _WindowVectors_text_end;
278 extern char _DebugInterruptVector_text_start;
279 extern char _DebugInterruptVector_text_end;
280 extern char _KernelExceptionVector_text_start;
281 extern char _KernelExceptionVector_text_end;
282 extern char _UserExceptionVector_text_start;
283 extern char _UserExceptionVector_text_end;
284 extern char _DoubleExceptionVector_text_start;
285 extern char _DoubleExceptionVector_text_end;
286 extern char _exception_text_start;
287 extern char _exception_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 #ifdef CONFIG_XIP_KERNEL
313 extern char _xip_start[];
314 extern char _xip_end[];
315 #endif
316 
317 static inline int __init_memblock mem_reserve(unsigned long start,
318 					      unsigned long end)
319 {
320 	return memblock_reserve(start, end - start);
321 }
322 
323 void __init setup_arch(char **cmdline_p)
324 {
325 	pr_info("config ID: %08x:%08x\n",
326 		xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE));
327 	if (xtensa_get_sr(SREG_EPC) != XCHAL_HW_CONFIGID0 ||
328 	    xtensa_get_sr(SREG_EXCSAVE) != XCHAL_HW_CONFIGID1)
329 		pr_info("built for config ID: %08x:%08x\n",
330 			XCHAL_HW_CONFIGID0, XCHAL_HW_CONFIGID1);
331 
332 	*cmdline_p = command_line;
333 	platform_setup(cmdline_p);
334 	strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
335 
336 	/* Reserve some memory regions */
337 
338 #ifdef CONFIG_BLK_DEV_INITRD
339 	if (initrd_start < initrd_end &&
340 	    !mem_reserve(__pa(initrd_start), __pa(initrd_end)))
341 		initrd_below_start_ok = 1;
342 	else
343 		initrd_start = 0;
344 #endif
345 
346 	mem_reserve(__pa(_stext), __pa(_end));
347 #ifdef CONFIG_XIP_KERNEL
348 	mem_reserve(__pa(_xip_start), __pa(_xip_end));
349 #endif
350 
351 #ifdef CONFIG_VECTORS_ADDR
352 	mem_reserve(__pa(&_WindowVectors_text_start),
353 		    __pa(&_WindowVectors_text_end));
354 
355 	mem_reserve(__pa(&_DebugInterruptVector_text_start),
356 		    __pa(&_DebugInterruptVector_text_end));
357 
358 	mem_reserve(__pa(&_KernelExceptionVector_text_start),
359 		    __pa(&_KernelExceptionVector_text_end));
360 
361 	mem_reserve(__pa(&_UserExceptionVector_text_start),
362 		    __pa(&_UserExceptionVector_text_end));
363 
364 	mem_reserve(__pa(&_DoubleExceptionVector_text_start),
365 		    __pa(&_DoubleExceptionVector_text_end));
366 
367 	mem_reserve(__pa(&_exception_text_start),
368 		    __pa(&_exception_text_end));
369 #if XCHAL_EXCM_LEVEL >= 2
370 	mem_reserve(__pa(&_Level2InterruptVector_text_start),
371 		    __pa(&_Level2InterruptVector_text_end));
372 #endif
373 #if XCHAL_EXCM_LEVEL >= 3
374 	mem_reserve(__pa(&_Level3InterruptVector_text_start),
375 		    __pa(&_Level3InterruptVector_text_end));
376 #endif
377 #if XCHAL_EXCM_LEVEL >= 4
378 	mem_reserve(__pa(&_Level4InterruptVector_text_start),
379 		    __pa(&_Level4InterruptVector_text_end));
380 #endif
381 #if XCHAL_EXCM_LEVEL >= 5
382 	mem_reserve(__pa(&_Level5InterruptVector_text_start),
383 		    __pa(&_Level5InterruptVector_text_end));
384 #endif
385 #if XCHAL_EXCM_LEVEL >= 6
386 	mem_reserve(__pa(&_Level6InterruptVector_text_start),
387 		    __pa(&_Level6InterruptVector_text_end));
388 #endif
389 
390 #endif /* CONFIG_VECTORS_ADDR */
391 
392 #ifdef CONFIG_SMP
393 	mem_reserve(__pa(&_SecondaryResetVector_text_start),
394 		    __pa(&_SecondaryResetVector_text_end));
395 #endif
396 	parse_early_param();
397 	bootmem_init();
398 	kasan_init();
399 	unflatten_and_copy_device_tree();
400 
401 #ifdef CONFIG_SMP
402 	smp_init_cpus();
403 #endif
404 
405 	paging_init();
406 	zones_init();
407 
408 #ifdef CONFIG_VT
409 # if defined(CONFIG_VGA_CONSOLE)
410 	conswitchp = &vga_con;
411 # endif
412 #endif
413 }
414 
415 static DEFINE_PER_CPU(struct cpu, cpu_data);
416 
417 static int __init topology_init(void)
418 {
419 	int i;
420 
421 	for_each_possible_cpu(i) {
422 		struct cpu *cpu = &per_cpu(cpu_data, i);
423 		cpu->hotpluggable = !!i;
424 		register_cpu(cpu, i);
425 	}
426 
427 	return 0;
428 }
429 subsys_initcall(topology_init);
430 
431 void cpu_reset(void)
432 {
433 #if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
434 	local_irq_disable();
435 	/*
436 	 * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
437 	 * be flushed.
438 	 * Way 4 is not currently used by linux.
439 	 * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
440 	 * Way 5 shall be flushed and way 6 shall be set to identity mapping
441 	 * on MMUv3.
442 	 */
443 	local_flush_tlb_all();
444 	invalidate_page_directory();
445 #if XCHAL_HAVE_SPANNING_WAY
446 	/* MMU v3 */
447 	{
448 		unsigned long vaddr = (unsigned long)cpu_reset;
449 		unsigned long paddr = __pa(vaddr);
450 		unsigned long tmpaddr = vaddr + SZ_512M;
451 		unsigned long tmp0, tmp1, tmp2, tmp3;
452 
453 		/*
454 		 * Find a place for the temporary mapping. It must not be
455 		 * in the same 512MB region with vaddr or paddr, otherwise
456 		 * there may be multihit exception either on entry to the
457 		 * temporary mapping, or on entry to the identity mapping.
458 		 * (512MB is the biggest page size supported by TLB.)
459 		 */
460 		while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
461 			tmpaddr += SZ_512M;
462 
463 		/* Invalidate mapping in the selected temporary area */
464 		if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
465 			invalidate_itlb_entry(itlb_probe(tmpaddr));
466 		if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
467 			invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
468 
469 		/*
470 		 * Map two consecutive pages starting at the physical address
471 		 * of this function to the temporary mapping area.
472 		 */
473 		write_itlb_entry(__pte((paddr & PAGE_MASK) |
474 				       _PAGE_HW_VALID |
475 				       _PAGE_HW_EXEC |
476 				       _PAGE_CA_BYPASS),
477 				 tmpaddr & PAGE_MASK);
478 		write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
479 				       _PAGE_HW_VALID |
480 				       _PAGE_HW_EXEC |
481 				       _PAGE_CA_BYPASS),
482 				 (tmpaddr & PAGE_MASK) + PAGE_SIZE);
483 
484 		/* Reinitialize TLB */
485 		__asm__ __volatile__ ("movi	%0, 1f\n\t"
486 				      "movi	%3, 2f\n\t"
487 				      "add	%0, %0, %4\n\t"
488 				      "add	%3, %3, %5\n\t"
489 				      "jx	%0\n"
490 				      /*
491 				       * No literal, data or stack access
492 				       * below this point
493 				       */
494 				      "1:\n\t"
495 				      /* Initialize *tlbcfg */
496 				      "movi	%0, 0\n\t"
497 				      "wsr	%0, itlbcfg\n\t"
498 				      "wsr	%0, dtlbcfg\n\t"
499 				      /* Invalidate TLB way 5 */
500 				      "movi	%0, 4\n\t"
501 				      "movi	%1, 5\n"
502 				      "1:\n\t"
503 				      "iitlb	%1\n\t"
504 				      "idtlb	%1\n\t"
505 				      "add	%1, %1, %6\n\t"
506 				      "addi	%0, %0, -1\n\t"
507 				      "bnez	%0, 1b\n\t"
508 				      /* Initialize TLB way 6 */
509 				      "movi	%0, 7\n\t"
510 				      "addi	%1, %9, 3\n\t"
511 				      "addi	%2, %9, 6\n"
512 				      "1:\n\t"
513 				      "witlb	%1, %2\n\t"
514 				      "wdtlb	%1, %2\n\t"
515 				      "add	%1, %1, %7\n\t"
516 				      "add	%2, %2, %7\n\t"
517 				      "addi	%0, %0, -1\n\t"
518 				      "bnez	%0, 1b\n\t"
519 				      "isync\n\t"
520 				      /* Jump to identity mapping */
521 				      "jx	%3\n"
522 				      "2:\n\t"
523 				      /* Complete way 6 initialization */
524 				      "witlb	%1, %2\n\t"
525 				      "wdtlb	%1, %2\n\t"
526 				      /* Invalidate temporary mapping */
527 				      "sub	%0, %9, %7\n\t"
528 				      "iitlb	%0\n\t"
529 				      "add	%0, %0, %8\n\t"
530 				      "iitlb	%0"
531 				      : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
532 					"=&a"(tmp3)
533 				      : "a"(tmpaddr - vaddr),
534 					"a"(paddr - vaddr),
535 					"a"(SZ_128M), "a"(SZ_512M),
536 					"a"(PAGE_SIZE),
537 					"a"((tmpaddr + SZ_512M) & PAGE_MASK)
538 				      : "memory");
539 	}
540 #endif
541 #endif
542 	__asm__ __volatile__ ("movi	a2, 0\n\t"
543 			      "wsr	a2, icountlevel\n\t"
544 			      "movi	a2, 0\n\t"
545 			      "wsr	a2, icount\n\t"
546 #if XCHAL_NUM_IBREAK > 0
547 			      "wsr	a2, ibreakenable\n\t"
548 #endif
549 #if XCHAL_HAVE_LOOPS
550 			      "wsr	a2, lcount\n\t"
551 #endif
552 			      "movi	a2, 0x1f\n\t"
553 			      "wsr	a2, ps\n\t"
554 			      "isync\n\t"
555 			      "jx	%0\n\t"
556 			      :
557 			      : "a" (XCHAL_RESET_VECTOR_VADDR)
558 			      : "a2");
559 	for (;;)
560 		;
561 }
562 
563 void machine_restart(char * cmd)
564 {
565 	platform_restart();
566 }
567 
568 void machine_halt(void)
569 {
570 	platform_halt();
571 	while (1);
572 }
573 
574 void machine_power_off(void)
575 {
576 	platform_power_off();
577 	while (1);
578 }
579 #ifdef CONFIG_PROC_FS
580 
581 /*
582  * Display some core information through /proc/cpuinfo.
583  */
584 
585 static int
586 c_show(struct seq_file *f, void *slot)
587 {
588 	/* high-level stuff */
589 	seq_printf(f, "CPU count\t: %u\n"
590 		      "CPU list\t: %*pbl\n"
591 		      "vendor_id\t: Tensilica\n"
592 		      "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
593 		      "core ID\t\t: " XCHAL_CORE_ID "\n"
594 		      "build ID\t: 0x%x\n"
595 		      "config ID\t: %08x:%08x\n"
596 		      "byte order\t: %s\n"
597 		      "cpu MHz\t\t: %lu.%02lu\n"
598 		      "bogomips\t: %lu.%02lu\n",
599 		      num_online_cpus(),
600 		      cpumask_pr_args(cpu_online_mask),
601 		      XCHAL_BUILD_UNIQUE_ID,
602 		      xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE),
603 		      XCHAL_HAVE_BE ?  "big" : "little",
604 		      ccount_freq/1000000,
605 		      (ccount_freq/10000) % 100,
606 		      loops_per_jiffy/(500000/HZ),
607 		      (loops_per_jiffy/(5000/HZ)) % 100);
608 	seq_puts(f, "flags\t\t: "
609 #if XCHAL_HAVE_NMI
610 		     "nmi "
611 #endif
612 #if XCHAL_HAVE_DEBUG
613 		     "debug "
614 # if XCHAL_HAVE_OCD
615 		     "ocd "
616 # endif
617 #endif
618 #if XCHAL_HAVE_DENSITY
619 	    	     "density "
620 #endif
621 #if XCHAL_HAVE_BOOLEANS
622 		     "boolean "
623 #endif
624 #if XCHAL_HAVE_LOOPS
625 		     "loop "
626 #endif
627 #if XCHAL_HAVE_NSA
628 		     "nsa "
629 #endif
630 #if XCHAL_HAVE_MINMAX
631 		     "minmax "
632 #endif
633 #if XCHAL_HAVE_SEXT
634 		     "sext "
635 #endif
636 #if XCHAL_HAVE_CLAMPS
637 		     "clamps "
638 #endif
639 #if XCHAL_HAVE_MAC16
640 		     "mac16 "
641 #endif
642 #if XCHAL_HAVE_MUL16
643 		     "mul16 "
644 #endif
645 #if XCHAL_HAVE_MUL32
646 		     "mul32 "
647 #endif
648 #if XCHAL_HAVE_MUL32_HIGH
649 		     "mul32h "
650 #endif
651 #if XCHAL_HAVE_FP
652 		     "fpu "
653 #endif
654 #if XCHAL_HAVE_S32C1I
655 		     "s32c1i "
656 #endif
657 #if XCHAL_HAVE_EXCLUSIVE
658 		     "exclusive "
659 #endif
660 		     "\n");
661 
662 	/* Registers. */
663 	seq_printf(f,"physical aregs\t: %d\n"
664 		     "misc regs\t: %d\n"
665 		     "ibreak\t\t: %d\n"
666 		     "dbreak\t\t: %d\n",
667 		     XCHAL_NUM_AREGS,
668 		     XCHAL_NUM_MISC_REGS,
669 		     XCHAL_NUM_IBREAK,
670 		     XCHAL_NUM_DBREAK);
671 
672 
673 	/* Interrupt. */
674 	seq_printf(f,"num ints\t: %d\n"
675 		     "ext ints\t: %d\n"
676 		     "int levels\t: %d\n"
677 		     "timers\t\t: %d\n"
678 		     "debug level\t: %d\n",
679 		     XCHAL_NUM_INTERRUPTS,
680 		     XCHAL_NUM_EXTINTERRUPTS,
681 		     XCHAL_NUM_INTLEVELS,
682 		     XCHAL_NUM_TIMERS,
683 		     XCHAL_DEBUGLEVEL);
684 
685 	/* Cache */
686 	seq_printf(f,"icache line size: %d\n"
687 		     "icache ways\t: %d\n"
688 		     "icache size\t: %d\n"
689 		     "icache flags\t: "
690 #if XCHAL_ICACHE_LINE_LOCKABLE
691 		     "lock "
692 #endif
693 		     "\n"
694 		     "dcache line size: %d\n"
695 		     "dcache ways\t: %d\n"
696 		     "dcache size\t: %d\n"
697 		     "dcache flags\t: "
698 #if XCHAL_DCACHE_IS_WRITEBACK
699 		     "writeback "
700 #endif
701 #if XCHAL_DCACHE_LINE_LOCKABLE
702 		     "lock "
703 #endif
704 		     "\n",
705 		     XCHAL_ICACHE_LINESIZE,
706 		     XCHAL_ICACHE_WAYS,
707 		     XCHAL_ICACHE_SIZE,
708 		     XCHAL_DCACHE_LINESIZE,
709 		     XCHAL_DCACHE_WAYS,
710 		     XCHAL_DCACHE_SIZE);
711 
712 	return 0;
713 }
714 
715 /*
716  * We show only CPU #0 info.
717  */
718 static void *
719 c_start(struct seq_file *f, loff_t *pos)
720 {
721 	return (*pos == 0) ? (void *)1 : NULL;
722 }
723 
724 static void *
725 c_next(struct seq_file *f, void *v, loff_t *pos)
726 {
727 	++*pos;
728 	return c_start(f, pos);
729 }
730 
731 static void
732 c_stop(struct seq_file *f, void *v)
733 {
734 }
735 
736 const struct seq_operations cpuinfo_op =
737 {
738 	.start	= c_start,
739 	.next	= c_next,
740 	.stop	= c_stop,
741 	.show	= c_show,
742 };
743 
744 #endif /* CONFIG_PROC_FS */
745