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Merge branch 'splice' of git://brick.kernel.dk/data/git/linux-2.6-block
[mirror_ubuntu-jammy-kernel.git] / arch / arm / kernel / setup.c
1 /*
2 * linux/arch/arm/kernel/setup.c
3 *
4 * Copyright (C) 1995-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #include <linux/config.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/stddef.h>
14 #include <linux/ioport.h>
15 #include <linux/delay.h>
16 #include <linux/utsname.h>
17 #include <linux/initrd.h>
18 #include <linux/console.h>
19 #include <linux/bootmem.h>
20 #include <linux/seq_file.h>
21 #include <linux/tty.h>
22 #include <linux/init.h>
23 #include <linux/root_dev.h>
24 #include <linux/cpu.h>
25 #include <linux/interrupt.h>
26 #include <linux/smp.h>
27
28 #include <asm/cpu.h>
29 #include <asm/elf.h>
30 #include <asm/procinfo.h>
31 #include <asm/setup.h>
32 #include <asm/mach-types.h>
33 #include <asm/cacheflush.h>
34 #include <asm/tlbflush.h>
35
36 #include <asm/mach/arch.h>
37 #include <asm/mach/irq.h>
38 #include <asm/mach/time.h>
39
40 #include "compat.h"
41
42 #ifndef MEM_SIZE
43 #define MEM_SIZE (16*1024*1024)
44 #endif
45
46 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
47 char fpe_type[8];
48
49 static int __init fpe_setup(char *line)
50 {
51 memcpy(fpe_type, line, 8);
52 return 1;
53 }
54
55 __setup("fpe=", fpe_setup);
56 #endif
57
58 extern void paging_init(struct meminfo *, struct machine_desc *desc);
59 extern void reboot_setup(char *str);
60 extern int root_mountflags;
61 extern void _stext, _text, _etext, __data_start, _edata, _end;
62
63 unsigned int processor_id;
64 unsigned int __machine_arch_type;
65 EXPORT_SYMBOL(__machine_arch_type);
66
67 unsigned int system_rev;
68 EXPORT_SYMBOL(system_rev);
69
70 unsigned int system_serial_low;
71 EXPORT_SYMBOL(system_serial_low);
72
73 unsigned int system_serial_high;
74 EXPORT_SYMBOL(system_serial_high);
75
76 unsigned int elf_hwcap;
77 EXPORT_SYMBOL(elf_hwcap);
78
79
80 #ifdef MULTI_CPU
81 struct processor processor;
82 #endif
83 #ifdef MULTI_TLB
84 struct cpu_tlb_fns cpu_tlb;
85 #endif
86 #ifdef MULTI_USER
87 struct cpu_user_fns cpu_user;
88 #endif
89 #ifdef MULTI_CACHE
90 struct cpu_cache_fns cpu_cache;
91 #endif
92
93 struct stack {
94 u32 irq[3];
95 u32 abt[3];
96 u32 und[3];
97 } ____cacheline_aligned;
98
99 static struct stack stacks[NR_CPUS];
100
101 char elf_platform[ELF_PLATFORM_SIZE];
102 EXPORT_SYMBOL(elf_platform);
103
104 unsigned long phys_initrd_start __initdata = 0;
105 unsigned long phys_initrd_size __initdata = 0;
106
107 static struct meminfo meminfo __initdata = { 0, };
108 static const char *cpu_name;
109 static const char *machine_name;
110 static char command_line[COMMAND_LINE_SIZE];
111
112 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
113 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
114 #define ENDIANNESS ((char)endian_test.l)
115
116 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
117
118 /*
119 * Standard memory resources
120 */
121 static struct resource mem_res[] = {
122 { "Video RAM", 0, 0, IORESOURCE_MEM },
123 { "Kernel text", 0, 0, IORESOURCE_MEM },
124 { "Kernel data", 0, 0, IORESOURCE_MEM }
125 };
126
127 #define video_ram mem_res[0]
128 #define kernel_code mem_res[1]
129 #define kernel_data mem_res[2]
130
131 static struct resource io_res[] = {
132 { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
133 { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
134 { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
135 };
136
137 #define lp0 io_res[0]
138 #define lp1 io_res[1]
139 #define lp2 io_res[2]
140
141 static const char *cache_types[16] = {
142 "write-through",
143 "write-back",
144 "write-back",
145 "undefined 3",
146 "undefined 4",
147 "undefined 5",
148 "write-back",
149 "write-back",
150 "undefined 8",
151 "undefined 9",
152 "undefined 10",
153 "undefined 11",
154 "undefined 12",
155 "undefined 13",
156 "write-back",
157 "undefined 15",
158 };
159
160 static const char *cache_clean[16] = {
161 "not required",
162 "read-block",
163 "cp15 c7 ops",
164 "undefined 3",
165 "undefined 4",
166 "undefined 5",
167 "cp15 c7 ops",
168 "cp15 c7 ops",
169 "undefined 8",
170 "undefined 9",
171 "undefined 10",
172 "undefined 11",
173 "undefined 12",
174 "undefined 13",
175 "cp15 c7 ops",
176 "undefined 15",
177 };
178
179 static const char *cache_lockdown[16] = {
180 "not supported",
181 "not supported",
182 "not supported",
183 "undefined 3",
184 "undefined 4",
185 "undefined 5",
186 "format A",
187 "format B",
188 "undefined 8",
189 "undefined 9",
190 "undefined 10",
191 "undefined 11",
192 "undefined 12",
193 "undefined 13",
194 "format C",
195 "undefined 15",
196 };
197
198 static const char *proc_arch[] = {
199 "undefined/unknown",
200 "3",
201 "4",
202 "4T",
203 "5",
204 "5T",
205 "5TE",
206 "5TEJ",
207 "6TEJ",
208 "7",
209 "?(11)",
210 "?(12)",
211 "?(13)",
212 "?(14)",
213 "?(15)",
214 "?(16)",
215 "?(17)",
216 };
217
218 #define CACHE_TYPE(x) (((x) >> 25) & 15)
219 #define CACHE_S(x) ((x) & (1 << 24))
220 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
221 #define CACHE_ISIZE(x) ((x) & 4095)
222
223 #define CACHE_SIZE(y) (((y) >> 6) & 7)
224 #define CACHE_ASSOC(y) (((y) >> 3) & 7)
225 #define CACHE_M(y) ((y) & (1 << 2))
226 #define CACHE_LINE(y) ((y) & 3)
227
228 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
229 {
230 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
231
232 printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
233 cpu, prefix,
234 mult << (8 + CACHE_SIZE(cache)),
235 (mult << CACHE_ASSOC(cache)) >> 1,
236 8 << CACHE_LINE(cache),
237 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
238 CACHE_LINE(cache)));
239 }
240
241 static void __init dump_cpu_info(int cpu)
242 {
243 unsigned int info = read_cpuid(CPUID_CACHETYPE);
244
245 if (info != processor_id) {
246 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
247 cache_types[CACHE_TYPE(info)]);
248 if (CACHE_S(info)) {
249 dump_cache("I cache", cpu, CACHE_ISIZE(info));
250 dump_cache("D cache", cpu, CACHE_DSIZE(info));
251 } else {
252 dump_cache("cache", cpu, CACHE_ISIZE(info));
253 }
254 }
255
256 if (arch_is_coherent())
257 printk("Cache coherency enabled\n");
258 }
259
260 int cpu_architecture(void)
261 {
262 int cpu_arch;
263
264 if ((processor_id & 0x0008f000) == 0) {
265 cpu_arch = CPU_ARCH_UNKNOWN;
266 } else if ((processor_id & 0x0008f000) == 0x00007000) {
267 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
268 } else if ((processor_id & 0x00080000) == 0x00000000) {
269 cpu_arch = (processor_id >> 16) & 7;
270 if (cpu_arch)
271 cpu_arch += CPU_ARCH_ARMv3;
272 } else {
273 /* the revised CPUID */
274 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
275 }
276
277 return cpu_arch;
278 }
279
280 /*
281 * These functions re-use the assembly code in head.S, which
282 * already provide the required functionality.
283 */
284 extern struct proc_info_list *lookup_processor_type(unsigned int);
285 extern struct machine_desc *lookup_machine_type(unsigned int);
286
287 static void __init setup_processor(void)
288 {
289 struct proc_info_list *list;
290
291 /*
292 * locate processor in the list of supported processor
293 * types. The linker builds this table for us from the
294 * entries in arch/arm/mm/proc-*.S
295 */
296 list = lookup_processor_type(processor_id);
297 if (!list) {
298 printk("CPU configuration botched (ID %08x), unable "
299 "to continue.\n", processor_id);
300 while (1);
301 }
302
303 cpu_name = list->cpu_name;
304
305 #ifdef MULTI_CPU
306 processor = *list->proc;
307 #endif
308 #ifdef MULTI_TLB
309 cpu_tlb = *list->tlb;
310 #endif
311 #ifdef MULTI_USER
312 cpu_user = *list->user;
313 #endif
314 #ifdef MULTI_CACHE
315 cpu_cache = *list->cache;
316 #endif
317
318 printk("CPU: %s [%08x] revision %d (ARMv%s)\n",
319 cpu_name, processor_id, (int)processor_id & 15,
320 proc_arch[cpu_architecture()]);
321
322 sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
323 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
324 elf_hwcap = list->elf_hwcap;
325 #ifndef CONFIG_ARM_THUMB
326 elf_hwcap &= ~HWCAP_THUMB;
327 #endif
328 #ifndef CONFIG_VFP
329 elf_hwcap &= ~HWCAP_VFP;
330 #endif
331
332 cpu_proc_init();
333 }
334
335 /*
336 * cpu_init - initialise one CPU.
337 *
338 * cpu_init dumps the cache information, initialises SMP specific
339 * information, and sets up the per-CPU stacks.
340 */
341 void cpu_init(void)
342 {
343 unsigned int cpu = smp_processor_id();
344 struct stack *stk = &stacks[cpu];
345
346 if (cpu >= NR_CPUS) {
347 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
348 BUG();
349 }
350
351 if (system_state == SYSTEM_BOOTING)
352 dump_cpu_info(cpu);
353
354 /*
355 * setup stacks for re-entrant exception handlers
356 */
357 __asm__ (
358 "msr cpsr_c, %1\n\t"
359 "add sp, %0, %2\n\t"
360 "msr cpsr_c, %3\n\t"
361 "add sp, %0, %4\n\t"
362 "msr cpsr_c, %5\n\t"
363 "add sp, %0, %6\n\t"
364 "msr cpsr_c, %7"
365 :
366 : "r" (stk),
367 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
368 "I" (offsetof(struct stack, irq[0])),
369 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
370 "I" (offsetof(struct stack, abt[0])),
371 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
372 "I" (offsetof(struct stack, und[0])),
373 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
374 : "r14");
375 }
376
377 static struct machine_desc * __init setup_machine(unsigned int nr)
378 {
379 struct machine_desc *list;
380
381 /*
382 * locate machine in the list of supported machines.
383 */
384 list = lookup_machine_type(nr);
385 if (!list) {
386 printk("Machine configuration botched (nr %d), unable "
387 "to continue.\n", nr);
388 while (1);
389 }
390
391 printk("Machine: %s\n", list->name);
392
393 return list;
394 }
395
396 static void __init early_initrd(char **p)
397 {
398 unsigned long start, size;
399
400 start = memparse(*p, p);
401 if (**p == ',') {
402 size = memparse((*p) + 1, p);
403
404 phys_initrd_start = start;
405 phys_initrd_size = size;
406 }
407 }
408 __early_param("initrd=", early_initrd);
409
410 static void __init add_memory(unsigned long start, unsigned long size)
411 {
412 /*
413 * Ensure that start/size are aligned to a page boundary.
414 * Size is appropriately rounded down, start is rounded up.
415 */
416 size -= start & ~PAGE_MASK;
417
418 meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start);
419 meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK;
420 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
421 meminfo.nr_banks += 1;
422 }
423
424 /*
425 * Pick out the memory size. We look for mem=size@start,
426 * where start and size are "size[KkMm]"
427 */
428 static void __init early_mem(char **p)
429 {
430 static int usermem __initdata = 0;
431 unsigned long size, start;
432
433 /*
434 * If the user specifies memory size, we
435 * blow away any automatically generated
436 * size.
437 */
438 if (usermem == 0) {
439 usermem = 1;
440 meminfo.nr_banks = 0;
441 }
442
443 start = PHYS_OFFSET;
444 size = memparse(*p, p);
445 if (**p == '@')
446 start = memparse(*p + 1, p);
447
448 add_memory(start, size);
449 }
450 __early_param("mem=", early_mem);
451
452 /*
453 * Initial parsing of the command line.
454 */
455 static void __init parse_cmdline(char **cmdline_p, char *from)
456 {
457 char c = ' ', *to = command_line;
458 int len = 0;
459
460 for (;;) {
461 if (c == ' ') {
462 extern struct early_params __early_begin, __early_end;
463 struct early_params *p;
464
465 for (p = &__early_begin; p < &__early_end; p++) {
466 int len = strlen(p->arg);
467
468 if (memcmp(from, p->arg, len) == 0) {
469 if (to != command_line)
470 to -= 1;
471 from += len;
472 p->fn(&from);
473
474 while (*from != ' ' && *from != '\0')
475 from++;
476 break;
477 }
478 }
479 }
480 c = *from++;
481 if (!c)
482 break;
483 if (COMMAND_LINE_SIZE <= ++len)
484 break;
485 *to++ = c;
486 }
487 *to = '\0';
488 *cmdline_p = command_line;
489 }
490
491 static void __init
492 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
493 {
494 #ifdef CONFIG_BLK_DEV_RAM
495 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
496
497 rd_image_start = image_start;
498 rd_prompt = prompt;
499 rd_doload = doload;
500
501 if (rd_sz)
502 rd_size = rd_sz;
503 #endif
504 }
505
506 static void __init
507 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
508 {
509 struct resource *res;
510 int i;
511
512 kernel_code.start = virt_to_phys(&_text);
513 kernel_code.end = virt_to_phys(&_etext - 1);
514 kernel_data.start = virt_to_phys(&__data_start);
515 kernel_data.end = virt_to_phys(&_end - 1);
516
517 for (i = 0; i < mi->nr_banks; i++) {
518 unsigned long virt_start, virt_end;
519
520 if (mi->bank[i].size == 0)
521 continue;
522
523 virt_start = __phys_to_virt(mi->bank[i].start);
524 virt_end = virt_start + mi->bank[i].size - 1;
525
526 res = alloc_bootmem_low(sizeof(*res));
527 res->name = "System RAM";
528 res->start = __virt_to_phys(virt_start);
529 res->end = __virt_to_phys(virt_end);
530 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
531
532 request_resource(&iomem_resource, res);
533
534 if (kernel_code.start >= res->start &&
535 kernel_code.end <= res->end)
536 request_resource(res, &kernel_code);
537 if (kernel_data.start >= res->start &&
538 kernel_data.end <= res->end)
539 request_resource(res, &kernel_data);
540 }
541
542 if (mdesc->video_start) {
543 video_ram.start = mdesc->video_start;
544 video_ram.end = mdesc->video_end;
545 request_resource(&iomem_resource, &video_ram);
546 }
547
548 /*
549 * Some machines don't have the possibility of ever
550 * possessing lp0, lp1 or lp2
551 */
552 if (mdesc->reserve_lp0)
553 request_resource(&ioport_resource, &lp0);
554 if (mdesc->reserve_lp1)
555 request_resource(&ioport_resource, &lp1);
556 if (mdesc->reserve_lp2)
557 request_resource(&ioport_resource, &lp2);
558 }
559
560 /*
561 * Tag parsing.
562 *
563 * This is the new way of passing data to the kernel at boot time. Rather
564 * than passing a fixed inflexible structure to the kernel, we pass a list
565 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
566 * tag for the list to be recognised (to distinguish the tagged list from
567 * a param_struct). The list is terminated with a zero-length tag (this tag
568 * is not parsed in any way).
569 */
570 static int __init parse_tag_core(const struct tag *tag)
571 {
572 if (tag->hdr.size > 2) {
573 if ((tag->u.core.flags & 1) == 0)
574 root_mountflags &= ~MS_RDONLY;
575 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
576 }
577 return 0;
578 }
579
580 __tagtable(ATAG_CORE, parse_tag_core);
581
582 static int __init parse_tag_mem32(const struct tag *tag)
583 {
584 if (meminfo.nr_banks >= NR_BANKS) {
585 printk(KERN_WARNING
586 "Ignoring memory bank 0x%08x size %dKB\n",
587 tag->u.mem.start, tag->u.mem.size / 1024);
588 return -EINVAL;
589 }
590 add_memory(tag->u.mem.start, tag->u.mem.size);
591 return 0;
592 }
593
594 __tagtable(ATAG_MEM, parse_tag_mem32);
595
596 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
597 struct screen_info screen_info = {
598 .orig_video_lines = 30,
599 .orig_video_cols = 80,
600 .orig_video_mode = 0,
601 .orig_video_ega_bx = 0,
602 .orig_video_isVGA = 1,
603 .orig_video_points = 8
604 };
605
606 static int __init parse_tag_videotext(const struct tag *tag)
607 {
608 screen_info.orig_x = tag->u.videotext.x;
609 screen_info.orig_y = tag->u.videotext.y;
610 screen_info.orig_video_page = tag->u.videotext.video_page;
611 screen_info.orig_video_mode = tag->u.videotext.video_mode;
612 screen_info.orig_video_cols = tag->u.videotext.video_cols;
613 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
614 screen_info.orig_video_lines = tag->u.videotext.video_lines;
615 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
616 screen_info.orig_video_points = tag->u.videotext.video_points;
617 return 0;
618 }
619
620 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
621 #endif
622
623 static int __init parse_tag_ramdisk(const struct tag *tag)
624 {
625 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
626 (tag->u.ramdisk.flags & 2) == 0,
627 tag->u.ramdisk.start, tag->u.ramdisk.size);
628 return 0;
629 }
630
631 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
632
633 static int __init parse_tag_initrd(const struct tag *tag)
634 {
635 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
636 "please update your bootloader.\n");
637 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
638 phys_initrd_size = tag->u.initrd.size;
639 return 0;
640 }
641
642 __tagtable(ATAG_INITRD, parse_tag_initrd);
643
644 static int __init parse_tag_initrd2(const struct tag *tag)
645 {
646 phys_initrd_start = tag->u.initrd.start;
647 phys_initrd_size = tag->u.initrd.size;
648 return 0;
649 }
650
651 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
652
653 static int __init parse_tag_serialnr(const struct tag *tag)
654 {
655 system_serial_low = tag->u.serialnr.low;
656 system_serial_high = tag->u.serialnr.high;
657 return 0;
658 }
659
660 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
661
662 static int __init parse_tag_revision(const struct tag *tag)
663 {
664 system_rev = tag->u.revision.rev;
665 return 0;
666 }
667
668 __tagtable(ATAG_REVISION, parse_tag_revision);
669
670 static int __init parse_tag_cmdline(const struct tag *tag)
671 {
672 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
673 return 0;
674 }
675
676 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
677
678 /*
679 * Scan the tag table for this tag, and call its parse function.
680 * The tag table is built by the linker from all the __tagtable
681 * declarations.
682 */
683 static int __init parse_tag(const struct tag *tag)
684 {
685 extern struct tagtable __tagtable_begin, __tagtable_end;
686 struct tagtable *t;
687
688 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
689 if (tag->hdr.tag == t->tag) {
690 t->parse(tag);
691 break;
692 }
693
694 return t < &__tagtable_end;
695 }
696
697 /*
698 * Parse all tags in the list, checking both the global and architecture
699 * specific tag tables.
700 */
701 static void __init parse_tags(const struct tag *t)
702 {
703 for (; t->hdr.size; t = tag_next(t))
704 if (!parse_tag(t))
705 printk(KERN_WARNING
706 "Ignoring unrecognised tag 0x%08x\n",
707 t->hdr.tag);
708 }
709
710 /*
711 * This holds our defaults.
712 */
713 static struct init_tags {
714 struct tag_header hdr1;
715 struct tag_core core;
716 struct tag_header hdr2;
717 struct tag_mem32 mem;
718 struct tag_header hdr3;
719 } init_tags __initdata = {
720 { tag_size(tag_core), ATAG_CORE },
721 { 1, PAGE_SIZE, 0xff },
722 { tag_size(tag_mem32), ATAG_MEM },
723 { MEM_SIZE, PHYS_OFFSET },
724 { 0, ATAG_NONE }
725 };
726
727 static void (*init_machine)(void) __initdata;
728
729 static int __init customize_machine(void)
730 {
731 /* customizes platform devices, or adds new ones */
732 if (init_machine)
733 init_machine();
734 return 0;
735 }
736 arch_initcall(customize_machine);
737
738 void __init setup_arch(char **cmdline_p)
739 {
740 struct tag *tags = (struct tag *)&init_tags;
741 struct machine_desc *mdesc;
742 char *from = default_command_line;
743
744 setup_processor();
745 mdesc = setup_machine(machine_arch_type);
746 machine_name = mdesc->name;
747
748 if (mdesc->soft_reboot)
749 reboot_setup("s");
750
751 if (mdesc->boot_params)
752 tags = phys_to_virt(mdesc->boot_params);
753
754 /*
755 * If we have the old style parameters, convert them to
756 * a tag list.
757 */
758 if (tags->hdr.tag != ATAG_CORE)
759 convert_to_tag_list(tags);
760 if (tags->hdr.tag != ATAG_CORE)
761 tags = (struct tag *)&init_tags;
762
763 if (mdesc->fixup)
764 mdesc->fixup(mdesc, tags, &from, &meminfo);
765
766 if (tags->hdr.tag == ATAG_CORE) {
767 if (meminfo.nr_banks != 0)
768 squash_mem_tags(tags);
769 parse_tags(tags);
770 }
771
772 init_mm.start_code = (unsigned long) &_text;
773 init_mm.end_code = (unsigned long) &_etext;
774 init_mm.end_data = (unsigned long) &_edata;
775 init_mm.brk = (unsigned long) &_end;
776
777 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
778 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
779 parse_cmdline(cmdline_p, from);
780 paging_init(&meminfo, mdesc);
781 request_standard_resources(&meminfo, mdesc);
782
783 #ifdef CONFIG_SMP
784 smp_init_cpus();
785 #endif
786
787 cpu_init();
788
789 /*
790 * Set up various architecture-specific pointers
791 */
792 init_arch_irq = mdesc->init_irq;
793 system_timer = mdesc->timer;
794 init_machine = mdesc->init_machine;
795
796 #ifdef CONFIG_VT
797 #if defined(CONFIG_VGA_CONSOLE)
798 conswitchp = &vga_con;
799 #elif defined(CONFIG_DUMMY_CONSOLE)
800 conswitchp = &dummy_con;
801 #endif
802 #endif
803 }
804
805
806 static int __init topology_init(void)
807 {
808 int cpu;
809
810 for_each_cpu(cpu)
811 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu, NULL);
812
813 return 0;
814 }
815
816 subsys_initcall(topology_init);
817
818 static const char *hwcap_str[] = {
819 "swp",
820 "half",
821 "thumb",
822 "26bit",
823 "fastmult",
824 "fpa",
825 "vfp",
826 "edsp",
827 "java",
828 NULL
829 };
830
831 static void
832 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
833 {
834 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
835
836 seq_printf(m, "%s size\t\t: %d\n"
837 "%s assoc\t\t: %d\n"
838 "%s line length\t: %d\n"
839 "%s sets\t\t: %d\n",
840 type, mult << (8 + CACHE_SIZE(cache)),
841 type, (mult << CACHE_ASSOC(cache)) >> 1,
842 type, 8 << CACHE_LINE(cache),
843 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
844 CACHE_LINE(cache)));
845 }
846
847 static int c_show(struct seq_file *m, void *v)
848 {
849 int i;
850
851 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
852 cpu_name, (int)processor_id & 15, elf_platform);
853
854 #if defined(CONFIG_SMP)
855 for_each_online_cpu(i) {
856 /*
857 * glibc reads /proc/cpuinfo to determine the number of
858 * online processors, looking for lines beginning with
859 * "processor". Give glibc what it expects.
860 */
861 seq_printf(m, "processor\t: %d\n", i);
862 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
863 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
864 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
865 }
866 #else /* CONFIG_SMP */
867 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
868 loops_per_jiffy / (500000/HZ),
869 (loops_per_jiffy / (5000/HZ)) % 100);
870 #endif
871
872 /* dump out the processor features */
873 seq_puts(m, "Features\t: ");
874
875 for (i = 0; hwcap_str[i]; i++)
876 if (elf_hwcap & (1 << i))
877 seq_printf(m, "%s ", hwcap_str[i]);
878
879 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
880 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
881
882 if ((processor_id & 0x0008f000) == 0x00000000) {
883 /* pre-ARM7 */
884 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
885 } else {
886 if ((processor_id & 0x0008f000) == 0x00007000) {
887 /* ARM7 */
888 seq_printf(m, "CPU variant\t: 0x%02x\n",
889 (processor_id >> 16) & 127);
890 } else {
891 /* post-ARM7 */
892 seq_printf(m, "CPU variant\t: 0x%x\n",
893 (processor_id >> 20) & 15);
894 }
895 seq_printf(m, "CPU part\t: 0x%03x\n",
896 (processor_id >> 4) & 0xfff);
897 }
898 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
899
900 {
901 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
902 if (cache_info != processor_id) {
903 seq_printf(m, "Cache type\t: %s\n"
904 "Cache clean\t: %s\n"
905 "Cache lockdown\t: %s\n"
906 "Cache format\t: %s\n",
907 cache_types[CACHE_TYPE(cache_info)],
908 cache_clean[CACHE_TYPE(cache_info)],
909 cache_lockdown[CACHE_TYPE(cache_info)],
910 CACHE_S(cache_info) ? "Harvard" : "Unified");
911
912 if (CACHE_S(cache_info)) {
913 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
914 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
915 } else {
916 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
917 }
918 }
919 }
920
921 seq_puts(m, "\n");
922
923 seq_printf(m, "Hardware\t: %s\n", machine_name);
924 seq_printf(m, "Revision\t: %04x\n", system_rev);
925 seq_printf(m, "Serial\t\t: %08x%08x\n",
926 system_serial_high, system_serial_low);
927
928 return 0;
929 }
930
931 static void *c_start(struct seq_file *m, loff_t *pos)
932 {
933 return *pos < 1 ? (void *)1 : NULL;
934 }
935
936 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
937 {
938 ++*pos;
939 return NULL;
940 }
941
942 static void c_stop(struct seq_file *m, void *v)
943 {
944 }
945
946 struct seq_operations cpuinfo_op = {
947 .start = c_start,
948 .next = c_next,
949 .stop = c_stop,
950 .show = c_show
951 };
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