xref: /linux/arch/xtensa/kernel/setup.c (revision a8b70ccf10e38775785d9cb12ead916474549f99) 
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 #include <platform/hardware.h>
51 
52 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
53 struct screen_info screen_info = {
54 	.orig_x = 0,
55 	.orig_y = 24,
56 	.orig_video_cols = 80,
57 	.orig_video_lines = 24,
58 	.orig_video_isVGA = 1,
59 	.orig_video_points = 16,
60 };
61 #endif
62 
63 #ifdef CONFIG_BLK_DEV_INITRD
64 extern unsigned long initrd_start;
65 extern unsigned long initrd_end;
66 int initrd_is_mapped = 0;
67 extern int initrd_below_start_ok;
68 #endif
69 
70 #ifdef CONFIG_OF
71 void *dtb_start = __dtb_start;
72 #endif
73 
74 extern unsigned long loops_per_jiffy;
75 
76 /* Command line specified as configuration option. */
77 
78 static char __initdata command_line[COMMAND_LINE_SIZE];
79 
80 #ifdef CONFIG_CMDLINE_BOOL
81 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
82 #endif
83 
84 /*
85  * Boot parameter parsing.
86  *
87  * The Xtensa port uses a list of variable-sized tags to pass data to
88  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
89  * to be recognised. The list is terminated with a zero-sized
90  * BP_TAG_LAST tag.
91  */
92 
93 typedef struct tagtable {
94 	u32 tag;
95 	int (*parse)(const bp_tag_t*);
96 } tagtable_t;
97 
98 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn 		\
99 	__attribute__((used, section(".taglist"))) = { tag, fn }
100 
101 /* parse current tag */
102 
103 static int __init parse_tag_mem(const bp_tag_t *tag)
104 {
105 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
106 
107 	if (mi->type != MEMORY_TYPE_CONVENTIONAL)
108 		return -1;
109 
110 	return memblock_add(mi->start, mi->end - mi->start);
111 }
112 
113 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
114 
115 #ifdef CONFIG_BLK_DEV_INITRD
116 
117 static int __init parse_tag_initrd(const bp_tag_t* tag)
118 {
119 	struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
120 
121 	initrd_start = (unsigned long)__va(mi->start);
122 	initrd_end = (unsigned long)__va(mi->end);
123 
124 	return 0;
125 }
126 
127 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
128 
129 #endif /* CONFIG_BLK_DEV_INITRD */
130 
131 #ifdef CONFIG_OF
132 
133 static int __init parse_tag_fdt(const bp_tag_t *tag)
134 {
135 	dtb_start = __va(tag->data[0]);
136 	return 0;
137 }
138 
139 __tagtable(BP_TAG_FDT, parse_tag_fdt);
140 
141 #endif /* CONFIG_OF */
142 
143 static int __init parse_tag_cmdline(const bp_tag_t* tag)
144 {
145 	strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
146 	return 0;
147 }
148 
149 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
150 
151 static int __init parse_bootparam(const bp_tag_t* tag)
152 {
153 	extern tagtable_t __tagtable_begin, __tagtable_end;
154 	tagtable_t *t;
155 
156 	/* Boot parameters must start with a BP_TAG_FIRST tag. */
157 
158 	if (tag->id != BP_TAG_FIRST) {
159 		pr_warn("Invalid boot parameters!\n");
160 		return 0;
161 	}
162 
163 	tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
164 
165 	/* Parse all tags. */
166 
167 	while (tag != NULL && tag->id != BP_TAG_LAST) {
168 		for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
169 			if (tag->id == t->tag) {
170 				t->parse(tag);
171 				break;
172 			}
173 		}
174 		if (t == &__tagtable_end)
175 			pr_warn("Ignoring tag 0x%08x\n", tag->id);
176 		tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
177 	}
178 
179 	return 0;
180 }
181 
182 #ifdef CONFIG_OF
183 
184 #if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
185 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
186 EXPORT_SYMBOL(xtensa_kio_paddr);
187 
188 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
189 		int depth, void *data)
190 {
191 	const __be32 *ranges;
192 	int len;
193 
194 	if (depth > 1)
195 		return 0;
196 
197 	if (!of_flat_dt_is_compatible(node, "simple-bus"))
198 		return 0;
199 
200 	ranges = of_get_flat_dt_prop(node, "ranges", &len);
201 	if (!ranges)
202 		return 1;
203 	if (len == 0)
204 		return 1;
205 
206 	xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
207 	/* round down to nearest 256MB boundary */
208 	xtensa_kio_paddr &= 0xf0000000;
209 
210 	init_kio();
211 
212 	return 1;
213 }
214 #else
215 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
216 		int depth, void *data)
217 {
218 	return 1;
219 }
220 #endif
221 
222 void __init early_init_devtree(void *params)
223 {
224 	early_init_dt_scan(params);
225 	of_scan_flat_dt(xtensa_dt_io_area, NULL);
226 
227 	if (!command_line[0])
228 		strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
229 }
230 
231 #endif /* CONFIG_OF */
232 
233 /*
234  * Initialize architecture. (Early stage)
235  */
236 
237 void __init init_arch(bp_tag_t *bp_start)
238 {
239 	/* Initialize MMU. */
240 
241 	init_mmu();
242 
243 	/* Initialize initial KASAN shadow map */
244 
245 	kasan_early_init();
246 
247 	/* Parse boot parameters */
248 
249 	if (bp_start)
250 		parse_bootparam(bp_start);
251 
252 #ifdef CONFIG_OF
253 	early_init_devtree(dtb_start);
254 #endif
255 
256 #ifdef CONFIG_CMDLINE_BOOL
257 	if (!command_line[0])
258 		strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
259 #endif
260 
261 	/* Early hook for platforms */
262 
263 	platform_init(bp_start);
264 }
265 
266 /*
267  * Initialize system. Setup memory and reserve regions.
268  */
269 
270 extern char _end[];
271 extern char _stext[];
272 extern char _WindowVectors_text_start;
273 extern char _WindowVectors_text_end;
274 extern char _DebugInterruptVector_text_start;
275 extern char _DebugInterruptVector_text_end;
276 extern char _KernelExceptionVector_text_start;
277 extern char _KernelExceptionVector_text_end;
278 extern char _UserExceptionVector_text_start;
279 extern char _UserExceptionVector_text_end;
280 extern char _DoubleExceptionVector_text_start;
281 extern char _DoubleExceptionVector_text_end;
282 #if XCHAL_EXCM_LEVEL >= 2
283 extern char _Level2InterruptVector_text_start;
284 extern char _Level2InterruptVector_text_end;
285 #endif
286 #if XCHAL_EXCM_LEVEL >= 3
287 extern char _Level3InterruptVector_text_start;
288 extern char _Level3InterruptVector_text_end;
289 #endif
290 #if XCHAL_EXCM_LEVEL >= 4
291 extern char _Level4InterruptVector_text_start;
292 extern char _Level4InterruptVector_text_end;
293 #endif
294 #if XCHAL_EXCM_LEVEL >= 5
295 extern char _Level5InterruptVector_text_start;
296 extern char _Level5InterruptVector_text_end;
297 #endif
298 #if XCHAL_EXCM_LEVEL >= 6
299 extern char _Level6InterruptVector_text_start;
300 extern char _Level6InterruptVector_text_end;
301 #endif
302 #ifdef CONFIG_SMP
303 extern char _SecondaryResetVector_text_start;
304 extern char _SecondaryResetVector_text_end;
305 #endif
306 
307 static inline int mem_reserve(unsigned long start, unsigned long end)
308 {
309 	return memblock_reserve(start, end - start);
310 }
311 
312 void __init setup_arch(char **cmdline_p)
313 {
314 	pr_info("config ID: %08x:%08x\n",
315 		get_sr(SREG_EPC), get_sr(SREG_EXCSAVE));
316 	if (get_sr(SREG_EPC) != XCHAL_HW_CONFIGID0 ||
317 	    get_sr(SREG_EXCSAVE) != XCHAL_HW_CONFIGID1)
318 		pr_info("built for config ID: %08x:%08x\n",
319 			XCHAL_HW_CONFIGID0, XCHAL_HW_CONFIGID1);
320 
321 	*cmdline_p = command_line;
322 	platform_setup(cmdline_p);
323 	strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
324 
325 	/* Reserve some memory regions */
326 
327 #ifdef CONFIG_BLK_DEV_INITRD
328 	if (initrd_start < initrd_end) {
329 		initrd_is_mapped = mem_reserve(__pa(initrd_start),
330 					       __pa(initrd_end)) == 0;
331 		initrd_below_start_ok = 1;
332 	} else {
333 		initrd_start = 0;
334 	}
335 #endif
336 
337 	mem_reserve(__pa(_stext), __pa(_end));
338 
339 #ifdef CONFIG_VECTORS_OFFSET
340 	mem_reserve(__pa(&_WindowVectors_text_start),
341 		    __pa(&_WindowVectors_text_end));
342 
343 	mem_reserve(__pa(&_DebugInterruptVector_text_start),
344 		    __pa(&_DebugInterruptVector_text_end));
345 
346 	mem_reserve(__pa(&_KernelExceptionVector_text_start),
347 		    __pa(&_KernelExceptionVector_text_end));
348 
349 	mem_reserve(__pa(&_UserExceptionVector_text_start),
350 		    __pa(&_UserExceptionVector_text_end));
351 
352 	mem_reserve(__pa(&_DoubleExceptionVector_text_start),
353 		    __pa(&_DoubleExceptionVector_text_end));
354 
355 #if XCHAL_EXCM_LEVEL >= 2
356 	mem_reserve(__pa(&_Level2InterruptVector_text_start),
357 		    __pa(&_Level2InterruptVector_text_end));
358 #endif
359 #if XCHAL_EXCM_LEVEL >= 3
360 	mem_reserve(__pa(&_Level3InterruptVector_text_start),
361 		    __pa(&_Level3InterruptVector_text_end));
362 #endif
363 #if XCHAL_EXCM_LEVEL >= 4
364 	mem_reserve(__pa(&_Level4InterruptVector_text_start),
365 		    __pa(&_Level4InterruptVector_text_end));
366 #endif
367 #if XCHAL_EXCM_LEVEL >= 5
368 	mem_reserve(__pa(&_Level5InterruptVector_text_start),
369 		    __pa(&_Level5InterruptVector_text_end));
370 #endif
371 #if XCHAL_EXCM_LEVEL >= 6
372 	mem_reserve(__pa(&_Level6InterruptVector_text_start),
373 		    __pa(&_Level6InterruptVector_text_end));
374 #endif
375 
376 #endif /* CONFIG_VECTORS_OFFSET */
377 
378 #ifdef CONFIG_SMP
379 	mem_reserve(__pa(&_SecondaryResetVector_text_start),
380 		    __pa(&_SecondaryResetVector_text_end));
381 #endif
382 	parse_early_param();
383 	bootmem_init();
384 	kasan_init();
385 	unflatten_and_copy_device_tree();
386 
387 #ifdef CONFIG_SMP
388 	smp_init_cpus();
389 #endif
390 
391 	paging_init();
392 	zones_init();
393 
394 #ifdef CONFIG_VT
395 # if defined(CONFIG_VGA_CONSOLE)
396 	conswitchp = &vga_con;
397 # elif defined(CONFIG_DUMMY_CONSOLE)
398 	conswitchp = &dummy_con;
399 # endif
400 #endif
401 
402 #ifdef CONFIG_PCI
403 	platform_pcibios_init();
404 #endif
405 }
406 
407 static DEFINE_PER_CPU(struct cpu, cpu_data);
408 
409 static int __init topology_init(void)
410 {
411 	int i;
412 
413 	for_each_possible_cpu(i) {
414 		struct cpu *cpu = &per_cpu(cpu_data, i);
415 		cpu->hotpluggable = !!i;
416 		register_cpu(cpu, i);
417 	}
418 
419 	return 0;
420 }
421 subsys_initcall(topology_init);
422 
423 void cpu_reset(void)
424 {
425 #if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
426 	local_irq_disable();
427 	/*
428 	 * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
429 	 * be flushed.
430 	 * Way 4 is not currently used by linux.
431 	 * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
432 	 * Way 5 shall be flushed and way 6 shall be set to identity mapping
433 	 * on MMUv3.
434 	 */
435 	local_flush_tlb_all();
436 	invalidate_page_directory();
437 #if XCHAL_HAVE_SPANNING_WAY
438 	/* MMU v3 */
439 	{
440 		unsigned long vaddr = (unsigned long)cpu_reset;
441 		unsigned long paddr = __pa(vaddr);
442 		unsigned long tmpaddr = vaddr + SZ_512M;
443 		unsigned long tmp0, tmp1, tmp2, tmp3;
444 
445 		/*
446 		 * Find a place for the temporary mapping. It must not be
447 		 * in the same 512MB region with vaddr or paddr, otherwise
448 		 * there may be multihit exception either on entry to the
449 		 * temporary mapping, or on entry to the identity mapping.
450 		 * (512MB is the biggest page size supported by TLB.)
451 		 */
452 		while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
453 			tmpaddr += SZ_512M;
454 
455 		/* Invalidate mapping in the selected temporary area */
456 		if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
457 			invalidate_itlb_entry(itlb_probe(tmpaddr));
458 		if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
459 			invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
460 
461 		/*
462 		 * Map two consecutive pages starting at the physical address
463 		 * of this function to the temporary mapping area.
464 		 */
465 		write_itlb_entry(__pte((paddr & PAGE_MASK) |
466 				       _PAGE_HW_VALID |
467 				       _PAGE_HW_EXEC |
468 				       _PAGE_CA_BYPASS),
469 				 tmpaddr & PAGE_MASK);
470 		write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
471 				       _PAGE_HW_VALID |
472 				       _PAGE_HW_EXEC |
473 				       _PAGE_CA_BYPASS),
474 				 (tmpaddr & PAGE_MASK) + PAGE_SIZE);
475 
476 		/* Reinitialize TLB */
477 		__asm__ __volatile__ ("movi	%0, 1f\n\t"
478 				      "movi	%3, 2f\n\t"
479 				      "add	%0, %0, %4\n\t"
480 				      "add	%3, %3, %5\n\t"
481 				      "jx	%0\n"
482 				      /*
483 				       * No literal, data or stack access
484 				       * below this point
485 				       */
486 				      "1:\n\t"
487 				      /* Initialize *tlbcfg */
488 				      "movi	%0, 0\n\t"
489 				      "wsr	%0, itlbcfg\n\t"
490 				      "wsr	%0, dtlbcfg\n\t"
491 				      /* Invalidate TLB way 5 */
492 				      "movi	%0, 4\n\t"
493 				      "movi	%1, 5\n"
494 				      "1:\n\t"
495 				      "iitlb	%1\n\t"
496 				      "idtlb	%1\n\t"
497 				      "add	%1, %1, %6\n\t"
498 				      "addi	%0, %0, -1\n\t"
499 				      "bnez	%0, 1b\n\t"
500 				      /* Initialize TLB way 6 */
501 				      "movi	%0, 7\n\t"
502 				      "addi	%1, %9, 3\n\t"
503 				      "addi	%2, %9, 6\n"
504 				      "1:\n\t"
505 				      "witlb	%1, %2\n\t"
506 				      "wdtlb	%1, %2\n\t"
507 				      "add	%1, %1, %7\n\t"
508 				      "add	%2, %2, %7\n\t"
509 				      "addi	%0, %0, -1\n\t"
510 				      "bnez	%0, 1b\n\t"
511 				      /* Jump to identity mapping */
512 				      "jx	%3\n"
513 				      "2:\n\t"
514 				      /* Complete way 6 initialization */
515 				      "witlb	%1, %2\n\t"
516 				      "wdtlb	%1, %2\n\t"
517 				      /* Invalidate temporary mapping */
518 				      "sub	%0, %9, %7\n\t"
519 				      "iitlb	%0\n\t"
520 				      "add	%0, %0, %8\n\t"
521 				      "iitlb	%0"
522 				      : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
523 					"=&a"(tmp3)
524 				      : "a"(tmpaddr - vaddr),
525 					"a"(paddr - vaddr),
526 					"a"(SZ_128M), "a"(SZ_512M),
527 					"a"(PAGE_SIZE),
528 					"a"((tmpaddr + SZ_512M) & PAGE_MASK)
529 				      : "memory");
530 	}
531 #endif
532 #endif
533 	__asm__ __volatile__ ("movi	a2, 0\n\t"
534 			      "wsr	a2, icountlevel\n\t"
535 			      "movi	a2, 0\n\t"
536 			      "wsr	a2, icount\n\t"
537 #if XCHAL_NUM_IBREAK > 0
538 			      "wsr	a2, ibreakenable\n\t"
539 #endif
540 #if XCHAL_HAVE_LOOPS
541 			      "wsr	a2, lcount\n\t"
542 #endif
543 			      "movi	a2, 0x1f\n\t"
544 			      "wsr	a2, ps\n\t"
545 			      "isync\n\t"
546 			      "jx	%0\n\t"
547 			      :
548 			      : "a" (XCHAL_RESET_VECTOR_VADDR)
549 			      : "a2");
550 	for (;;)
551 		;
552 }
553 
554 void machine_restart(char * cmd)
555 {
556 	platform_restart();
557 }
558 
559 void machine_halt(void)
560 {
561 	platform_halt();
562 	while (1);
563 }
564 
565 void machine_power_off(void)
566 {
567 	platform_power_off();
568 	while (1);
569 }
570 #ifdef CONFIG_PROC_FS
571 
572 /*
573  * Display some core information through /proc/cpuinfo.
574  */
575 
576 static int
577 c_show(struct seq_file *f, void *slot)
578 {
579 	/* high-level stuff */
580 	seq_printf(f, "CPU count\t: %u\n"
581 		      "CPU list\t: %*pbl\n"
582 		      "vendor_id\t: Tensilica\n"
583 		      "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
584 		      "core ID\t\t: " XCHAL_CORE_ID "\n"
585 		      "build ID\t: 0x%x\n"
586 		      "config ID\t: %08x:%08x\n"
587 		      "byte order\t: %s\n"
588 		      "cpu MHz\t\t: %lu.%02lu\n"
589 		      "bogomips\t: %lu.%02lu\n",
590 		      num_online_cpus(),
591 		      cpumask_pr_args(cpu_online_mask),
592 		      XCHAL_BUILD_UNIQUE_ID,
593 		      get_sr(SREG_EPC), get_sr(SREG_EXCSAVE),
594 		      XCHAL_HAVE_BE ?  "big" : "little",
595 		      ccount_freq/1000000,
596 		      (ccount_freq/10000) % 100,
597 		      loops_per_jiffy/(500000/HZ),
598 		      (loops_per_jiffy/(5000/HZ)) % 100);
599 	seq_puts(f, "flags\t\t: "
600 #if XCHAL_HAVE_NMI
601 		     "nmi "
602 #endif
603 #if XCHAL_HAVE_DEBUG
604 		     "debug "
605 # if XCHAL_HAVE_OCD
606 		     "ocd "
607 # endif
608 #endif
609 #if XCHAL_HAVE_DENSITY
610 	    	     "density "
611 #endif
612 #if XCHAL_HAVE_BOOLEANS
613 		     "boolean "
614 #endif
615 #if XCHAL_HAVE_LOOPS
616 		     "loop "
617 #endif
618 #if XCHAL_HAVE_NSA
619 		     "nsa "
620 #endif
621 #if XCHAL_HAVE_MINMAX
622 		     "minmax "
623 #endif
624 #if XCHAL_HAVE_SEXT
625 		     "sext "
626 #endif
627 #if XCHAL_HAVE_CLAMPS
628 		     "clamps "
629 #endif
630 #if XCHAL_HAVE_MAC16
631 		     "mac16 "
632 #endif
633 #if XCHAL_HAVE_MUL16
634 		     "mul16 "
635 #endif
636 #if XCHAL_HAVE_MUL32
637 		     "mul32 "
638 #endif
639 #if XCHAL_HAVE_MUL32_HIGH
640 		     "mul32h "
641 #endif
642 #if XCHAL_HAVE_FP
643 		     "fpu "
644 #endif
645 #if XCHAL_HAVE_S32C1I
646 		     "s32c1i "
647 #endif
648 		     "\n");
649 
650 	/* Registers. */
651 	seq_printf(f,"physical aregs\t: %d\n"
652 		     "misc regs\t: %d\n"
653 		     "ibreak\t\t: %d\n"
654 		     "dbreak\t\t: %d\n",
655 		     XCHAL_NUM_AREGS,
656 		     XCHAL_NUM_MISC_REGS,
657 		     XCHAL_NUM_IBREAK,
658 		     XCHAL_NUM_DBREAK);
659 
660 
661 	/* Interrupt. */
662 	seq_printf(f,"num ints\t: %d\n"
663 		     "ext ints\t: %d\n"
664 		     "int levels\t: %d\n"
665 		     "timers\t\t: %d\n"
666 		     "debug level\t: %d\n",
667 		     XCHAL_NUM_INTERRUPTS,
668 		     XCHAL_NUM_EXTINTERRUPTS,
669 		     XCHAL_NUM_INTLEVELS,
670 		     XCHAL_NUM_TIMERS,
671 		     XCHAL_DEBUGLEVEL);
672 
673 	/* Cache */
674 	seq_printf(f,"icache line size: %d\n"
675 		     "icache ways\t: %d\n"
676 		     "icache size\t: %d\n"
677 		     "icache flags\t: "
678 #if XCHAL_ICACHE_LINE_LOCKABLE
679 		     "lock "
680 #endif
681 		     "\n"
682 		     "dcache line size: %d\n"
683 		     "dcache ways\t: %d\n"
684 		     "dcache size\t: %d\n"
685 		     "dcache flags\t: "
686 #if XCHAL_DCACHE_IS_WRITEBACK
687 		     "writeback "
688 #endif
689 #if XCHAL_DCACHE_LINE_LOCKABLE
690 		     "lock "
691 #endif
692 		     "\n",
693 		     XCHAL_ICACHE_LINESIZE,
694 		     XCHAL_ICACHE_WAYS,
695 		     XCHAL_ICACHE_SIZE,
696 		     XCHAL_DCACHE_LINESIZE,
697 		     XCHAL_DCACHE_WAYS,
698 		     XCHAL_DCACHE_SIZE);
699 
700 	return 0;
701 }
702 
703 /*
704  * We show only CPU #0 info.
705  */
706 static void *
707 c_start(struct seq_file *f, loff_t *pos)
708 {
709 	return (*pos == 0) ? (void *)1 : NULL;
710 }
711 
712 static void *
713 c_next(struct seq_file *f, void *v, loff_t *pos)
714 {
715 	return NULL;
716 }
717 
718 static void
719 c_stop(struct seq_file *f, void *v)
720 {
721 }
722 
723 const struct seq_operations cpuinfo_op =
724 {
725 	.start	= c_start,
726 	.next	= c_next,
727 	.stop	= c_stop,
728 	.show	= c_show,
729 };
730 
731 #endif /* CONFIG_PROC_FS */
732