ed522151878bdc5996def09b367892f95e8e4881
[sfrench/cifs-2.6.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/module.h>
11 #include <linux/kernel.h>
12 #include <linux/stddef.h>
13 #include <linux/ioport.h>
14 #include <linux/delay.h>
15 #include <linux/utsname.h>
16 #include <linux/initrd.h>
17 #include <linux/console.h>
18 #include <linux/bootmem.h>
19 #include <linux/seq_file.h>
20 #include <linux/screen_info.h>
21 #include <linux/init.h>
22 #include <linux/root_dev.h>
23 #include <linux/cpu.h>
24 #include <linux/interrupt.h>
25 #include <linux/smp.h>
26
27 #include <asm/cpu.h>
28 #include <asm/elf.h>
29 #include <asm/procinfo.h>
30 #include <asm/setup.h>
31 #include <asm/mach-types.h>
32 #include <asm/cacheflush.h>
33 #include <asm/tlbflush.h>
34
35 #include <asm/mach/arch.h>
36 #include <asm/mach/irq.h>
37 #include <asm/mach/time.h>
38
39 #include "compat.h"
40
41 #ifndef MEM_SIZE
42 #define MEM_SIZE        (16*1024*1024)
43 #endif
44
45 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
46 char fpe_type[8];
47
48 static int __init fpe_setup(char *line)
49 {
50         memcpy(fpe_type, line, 8);
51         return 1;
52 }
53
54 __setup("fpe=", fpe_setup);
55 #endif
56
57 extern void paging_init(struct meminfo *, struct machine_desc *desc);
58 extern void reboot_setup(char *str);
59 extern int root_mountflags;
60 extern void _stext, _text, _etext, __data_start, _edata, _end;
61
62 unsigned int processor_id;
63 unsigned int __machine_arch_type;
64 EXPORT_SYMBOL(__machine_arch_type);
65
66 unsigned int system_rev;
67 EXPORT_SYMBOL(system_rev);
68
69 unsigned int system_serial_low;
70 EXPORT_SYMBOL(system_serial_low);
71
72 unsigned int system_serial_high;
73 EXPORT_SYMBOL(system_serial_high);
74
75 unsigned int elf_hwcap;
76 EXPORT_SYMBOL(elf_hwcap);
77
78
79 #ifdef MULTI_CPU
80 struct processor processor;
81 #endif
82 #ifdef MULTI_TLB
83 struct cpu_tlb_fns cpu_tlb;
84 #endif
85 #ifdef MULTI_USER
86 struct cpu_user_fns cpu_user;
87 #endif
88 #ifdef MULTI_CACHE
89 struct cpu_cache_fns cpu_cache;
90 #endif
91
92 struct stack {
93         u32 irq[3];
94         u32 abt[3];
95         u32 und[3];
96 } ____cacheline_aligned;
97
98 static struct stack stacks[NR_CPUS];
99
100 char elf_platform[ELF_PLATFORM_SIZE];
101 EXPORT_SYMBOL(elf_platform);
102
103 unsigned long phys_initrd_start __initdata = 0;
104 unsigned long phys_initrd_size __initdata = 0;
105
106 static struct meminfo meminfo __initdata = { 0, };
107 static const char *cpu_name;
108 static const char *machine_name;
109 static char __initdata command_line[COMMAND_LINE_SIZE];
110
111 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
112 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
113 #define ENDIANNESS ((char)endian_test.l)
114
115 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
116
117 /*
118  * Standard memory resources
119  */
120 static struct resource mem_res[] = {
121         {
122                 .name = "Video RAM",
123                 .start = 0,
124                 .end = 0,
125                 .flags = IORESOURCE_MEM
126         },
127         {
128                 .name = "Kernel text",
129                 .start = 0,
130                 .end = 0,
131                 .flags = IORESOURCE_MEM
132         },
133         {
134                 .name = "Kernel data",
135                 .start = 0,
136                 .end = 0,
137                 .flags = IORESOURCE_MEM
138         }
139 };
140
141 #define video_ram   mem_res[0]
142 #define kernel_code mem_res[1]
143 #define kernel_data mem_res[2]
144
145 static struct resource io_res[] = {
146         {
147                 .name = "reserved",
148                 .start = 0x3bc,
149                 .end = 0x3be,
150                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
151         },
152         {
153                 .name = "reserved",
154                 .start = 0x378,
155                 .end = 0x37f,
156                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
157         },
158         {
159                 .name = "reserved",
160                 .start = 0x278,
161                 .end = 0x27f,
162                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
163         }
164 };
165
166 #define lp0 io_res[0]
167 #define lp1 io_res[1]
168 #define lp2 io_res[2]
169
170 static const char *cache_types[16] = {
171         "write-through",
172         "write-back",
173         "write-back",
174         "undefined 3",
175         "undefined 4",
176         "undefined 5",
177         "write-back",
178         "write-back",
179         "undefined 8",
180         "undefined 9",
181         "undefined 10",
182         "undefined 11",
183         "undefined 12",
184         "undefined 13",
185         "write-back",
186         "undefined 15",
187 };
188
189 static const char *cache_clean[16] = {
190         "not required",
191         "read-block",
192         "cp15 c7 ops",
193         "undefined 3",
194         "undefined 4",
195         "undefined 5",
196         "cp15 c7 ops",
197         "cp15 c7 ops",
198         "undefined 8",
199         "undefined 9",
200         "undefined 10",
201         "undefined 11",
202         "undefined 12",
203         "undefined 13",
204         "cp15 c7 ops",
205         "undefined 15",
206 };
207
208 static const char *cache_lockdown[16] = {
209         "not supported",
210         "not supported",
211         "not supported",
212         "undefined 3",
213         "undefined 4",
214         "undefined 5",
215         "format A",
216         "format B",
217         "undefined 8",
218         "undefined 9",
219         "undefined 10",
220         "undefined 11",
221         "undefined 12",
222         "undefined 13",
223         "format C",
224         "undefined 15",
225 };
226
227 static const char *proc_arch[] = {
228         "undefined/unknown",
229         "3",
230         "4",
231         "4T",
232         "5",
233         "5T",
234         "5TE",
235         "5TEJ",
236         "6TEJ",
237         "7",
238         "?(11)",
239         "?(12)",
240         "?(13)",
241         "?(14)",
242         "?(15)",
243         "?(16)",
244         "?(17)",
245 };
246
247 #define CACHE_TYPE(x)   (((x) >> 25) & 15)
248 #define CACHE_S(x)      ((x) & (1 << 24))
249 #define CACHE_DSIZE(x)  (((x) >> 12) & 4095)    /* only if S=1 */
250 #define CACHE_ISIZE(x)  ((x) & 4095)
251
252 #define CACHE_SIZE(y)   (((y) >> 6) & 7)
253 #define CACHE_ASSOC(y)  (((y) >> 3) & 7)
254 #define CACHE_M(y)      ((y) & (1 << 2))
255 #define CACHE_LINE(y)   ((y) & 3)
256
257 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
258 {
259         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
260
261         printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
262                 cpu, prefix,
263                 mult << (8 + CACHE_SIZE(cache)),
264                 (mult << CACHE_ASSOC(cache)) >> 1,
265                 8 << CACHE_LINE(cache),
266                 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
267                         CACHE_LINE(cache)));
268 }
269
270 static void __init dump_cpu_info(int cpu)
271 {
272         unsigned int info = read_cpuid(CPUID_CACHETYPE);
273
274         if (info != processor_id) {
275                 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
276                        cache_types[CACHE_TYPE(info)]);
277                 if (CACHE_S(info)) {
278                         dump_cache("I cache", cpu, CACHE_ISIZE(info));
279                         dump_cache("D cache", cpu, CACHE_DSIZE(info));
280                 } else {
281                         dump_cache("cache", cpu, CACHE_ISIZE(info));
282                 }
283         }
284
285         if (arch_is_coherent())
286                 printk("Cache coherency enabled\n");
287 }
288
289 int cpu_architecture(void)
290 {
291         int cpu_arch;
292
293         if ((processor_id & 0x0008f000) == 0) {
294                 cpu_arch = CPU_ARCH_UNKNOWN;
295         } else if ((processor_id & 0x0008f000) == 0x00007000) {
296                 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
297         } else if ((processor_id & 0x00080000) == 0x00000000) {
298                 cpu_arch = (processor_id >> 16) & 7;
299                 if (cpu_arch)
300                         cpu_arch += CPU_ARCH_ARMv3;
301         } else {
302                 /* the revised CPUID */
303                 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
304         }
305
306         return cpu_arch;
307 }
308
309 /*
310  * These functions re-use the assembly code in head.S, which
311  * already provide the required functionality.
312  */
313 extern struct proc_info_list *lookup_processor_type(unsigned int);
314 extern struct machine_desc *lookup_machine_type(unsigned int);
315
316 static void __init setup_processor(void)
317 {
318         struct proc_info_list *list;
319
320         /*
321          * locate processor in the list of supported processor
322          * types.  The linker builds this table for us from the
323          * entries in arch/arm/mm/proc-*.S
324          */
325         list = lookup_processor_type(processor_id);
326         if (!list) {
327                 printk("CPU configuration botched (ID %08x), unable "
328                        "to continue.\n", processor_id);
329                 while (1);
330         }
331
332         cpu_name = list->cpu_name;
333
334 #ifdef MULTI_CPU
335         processor = *list->proc;
336 #endif
337 #ifdef MULTI_TLB
338         cpu_tlb = *list->tlb;
339 #endif
340 #ifdef MULTI_USER
341         cpu_user = *list->user;
342 #endif
343 #ifdef MULTI_CACHE
344         cpu_cache = *list->cache;
345 #endif
346
347         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
348                cpu_name, processor_id, (int)processor_id & 15,
349                proc_arch[cpu_architecture()], cr_alignment);
350
351         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
352         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
353         elf_hwcap = list->elf_hwcap;
354 #ifndef CONFIG_ARM_THUMB
355         elf_hwcap &= ~HWCAP_THUMB;
356 #endif
357
358         cpu_proc_init();
359 }
360
361 /*
362  * cpu_init - initialise one CPU.
363  *
364  * cpu_init dumps the cache information, initialises SMP specific
365  * information, and sets up the per-CPU stacks.
366  */
367 void cpu_init(void)
368 {
369         unsigned int cpu = smp_processor_id();
370         struct stack *stk = &stacks[cpu];
371
372         if (cpu >= NR_CPUS) {
373                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
374                 BUG();
375         }
376
377         if (system_state == SYSTEM_BOOTING)
378                 dump_cpu_info(cpu);
379
380         /*
381          * setup stacks for re-entrant exception handlers
382          */
383         __asm__ (
384         "msr    cpsr_c, %1\n\t"
385         "add    sp, %0, %2\n\t"
386         "msr    cpsr_c, %3\n\t"
387         "add    sp, %0, %4\n\t"
388         "msr    cpsr_c, %5\n\t"
389         "add    sp, %0, %6\n\t"
390         "msr    cpsr_c, %7"
391             :
392             : "r" (stk),
393               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
394               "I" (offsetof(struct stack, irq[0])),
395               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
396               "I" (offsetof(struct stack, abt[0])),
397               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
398               "I" (offsetof(struct stack, und[0])),
399               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
400             : "r14");
401 }
402
403 static struct machine_desc * __init setup_machine(unsigned int nr)
404 {
405         struct machine_desc *list;
406
407         /*
408          * locate machine in the list of supported machines.
409          */
410         list = lookup_machine_type(nr);
411         if (!list) {
412                 printk("Machine configuration botched (nr %d), unable "
413                        "to continue.\n", nr);
414                 while (1);
415         }
416
417         printk("Machine: %s\n", list->name);
418
419         return list;
420 }
421
422 static void __init early_initrd(char **p)
423 {
424         unsigned long start, size;
425
426         start = memparse(*p, p);
427         if (**p == ',') {
428                 size = memparse((*p) + 1, p);
429
430                 phys_initrd_start = start;
431                 phys_initrd_size = size;
432         }
433 }
434 __early_param("initrd=", early_initrd);
435
436 static void __init arm_add_memory(unsigned long start, unsigned long size)
437 {
438         struct membank *bank;
439
440         /*
441          * Ensure that start/size are aligned to a page boundary.
442          * Size is appropriately rounded down, start is rounded up.
443          */
444         size -= start & ~PAGE_MASK;
445
446         bank = &meminfo.bank[meminfo.nr_banks++];
447
448         bank->start = PAGE_ALIGN(start);
449         bank->size  = size & PAGE_MASK;
450         bank->node  = PHYS_TO_NID(start);
451 }
452
453 /*
454  * Pick out the memory size.  We look for mem=size@start,
455  * where start and size are "size[KkMm]"
456  */
457 static void __init early_mem(char **p)
458 {
459         static int usermem __initdata = 0;
460         unsigned long size, start;
461
462         /*
463          * If the user specifies memory size, we
464          * blow away any automatically generated
465          * size.
466          */
467         if (usermem == 0) {
468                 usermem = 1;
469                 meminfo.nr_banks = 0;
470         }
471
472         start = PHYS_OFFSET;
473         size  = memparse(*p, p);
474         if (**p == '@')
475                 start = memparse(*p + 1, p);
476
477         arm_add_memory(start, size);
478 }
479 __early_param("mem=", early_mem);
480
481 /*
482  * Initial parsing of the command line.
483  */
484 static void __init parse_cmdline(char **cmdline_p, char *from)
485 {
486         char c = ' ', *to = command_line;
487         int len = 0;
488
489         for (;;) {
490                 if (c == ' ') {
491                         extern struct early_params __early_begin, __early_end;
492                         struct early_params *p;
493
494                         for (p = &__early_begin; p < &__early_end; p++) {
495                                 int len = strlen(p->arg);
496
497                                 if (memcmp(from, p->arg, len) == 0) {
498                                         if (to != command_line)
499                                                 to -= 1;
500                                         from += len;
501                                         p->fn(&from);
502
503                                         while (*from != ' ' && *from != '\0')
504                                                 from++;
505                                         break;
506                                 }
507                         }
508                 }
509                 c = *from++;
510                 if (!c)
511                         break;
512                 if (COMMAND_LINE_SIZE <= ++len)
513                         break;
514                 *to++ = c;
515         }
516         *to = '\0';
517         *cmdline_p = command_line;
518 }
519
520 static void __init
521 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
522 {
523 #ifdef CONFIG_BLK_DEV_RAM
524         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
525
526         rd_image_start = image_start;
527         rd_prompt = prompt;
528         rd_doload = doload;
529
530         if (rd_sz)
531                 rd_size = rd_sz;
532 #endif
533 }
534
535 static void __init
536 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
537 {
538         struct resource *res;
539         int i;
540
541         kernel_code.start   = virt_to_phys(&_text);
542         kernel_code.end     = virt_to_phys(&_etext - 1);
543         kernel_data.start   = virt_to_phys(&__data_start);
544         kernel_data.end     = virt_to_phys(&_end - 1);
545
546         for (i = 0; i < mi->nr_banks; i++) {
547                 unsigned long virt_start, virt_end;
548
549                 if (mi->bank[i].size == 0)
550                         continue;
551
552                 virt_start = __phys_to_virt(mi->bank[i].start);
553                 virt_end   = virt_start + mi->bank[i].size - 1;
554
555                 res = alloc_bootmem_low(sizeof(*res));
556                 res->name  = "System RAM";
557                 res->start = __virt_to_phys(virt_start);
558                 res->end   = __virt_to_phys(virt_end);
559                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
560
561                 request_resource(&iomem_resource, res);
562
563                 if (kernel_code.start >= res->start &&
564                     kernel_code.end <= res->end)
565                         request_resource(res, &kernel_code);
566                 if (kernel_data.start >= res->start &&
567                     kernel_data.end <= res->end)
568                         request_resource(res, &kernel_data);
569         }
570
571         if (mdesc->video_start) {
572                 video_ram.start = mdesc->video_start;
573                 video_ram.end   = mdesc->video_end;
574                 request_resource(&iomem_resource, &video_ram);
575         }
576
577         /*
578          * Some machines don't have the possibility of ever
579          * possessing lp0, lp1 or lp2
580          */
581         if (mdesc->reserve_lp0)
582                 request_resource(&ioport_resource, &lp0);
583         if (mdesc->reserve_lp1)
584                 request_resource(&ioport_resource, &lp1);
585         if (mdesc->reserve_lp2)
586                 request_resource(&ioport_resource, &lp2);
587 }
588
589 /*
590  *  Tag parsing.
591  *
592  * This is the new way of passing data to the kernel at boot time.  Rather
593  * than passing a fixed inflexible structure to the kernel, we pass a list
594  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
595  * tag for the list to be recognised (to distinguish the tagged list from
596  * a param_struct).  The list is terminated with a zero-length tag (this tag
597  * is not parsed in any way).
598  */
599 static int __init parse_tag_core(const struct tag *tag)
600 {
601         if (tag->hdr.size > 2) {
602                 if ((tag->u.core.flags & 1) == 0)
603                         root_mountflags &= ~MS_RDONLY;
604                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
605         }
606         return 0;
607 }
608
609 __tagtable(ATAG_CORE, parse_tag_core);
610
611 static int __init parse_tag_mem32(const struct tag *tag)
612 {
613         if (meminfo.nr_banks >= NR_BANKS) {
614                 printk(KERN_WARNING
615                        "Ignoring memory bank 0x%08x size %dKB\n",
616                         tag->u.mem.start, tag->u.mem.size / 1024);
617                 return -EINVAL;
618         }
619         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
620         return 0;
621 }
622
623 __tagtable(ATAG_MEM, parse_tag_mem32);
624
625 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
626 struct screen_info screen_info = {
627  .orig_video_lines      = 30,
628  .orig_video_cols       = 80,
629  .orig_video_mode       = 0,
630  .orig_video_ega_bx     = 0,
631  .orig_video_isVGA      = 1,
632  .orig_video_points     = 8
633 };
634
635 static int __init parse_tag_videotext(const struct tag *tag)
636 {
637         screen_info.orig_x            = tag->u.videotext.x;
638         screen_info.orig_y            = tag->u.videotext.y;
639         screen_info.orig_video_page   = tag->u.videotext.video_page;
640         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
641         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
642         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
643         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
644         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
645         screen_info.orig_video_points = tag->u.videotext.video_points;
646         return 0;
647 }
648
649 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
650 #endif
651
652 static int __init parse_tag_ramdisk(const struct tag *tag)
653 {
654         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
655                       (tag->u.ramdisk.flags & 2) == 0,
656                       tag->u.ramdisk.start, tag->u.ramdisk.size);
657         return 0;
658 }
659
660 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
661
662 static int __init parse_tag_initrd(const struct tag *tag)
663 {
664         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
665                 "please update your bootloader.\n");
666         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
667         phys_initrd_size = tag->u.initrd.size;
668         return 0;
669 }
670
671 __tagtable(ATAG_INITRD, parse_tag_initrd);
672
673 static int __init parse_tag_initrd2(const struct tag *tag)
674 {
675         phys_initrd_start = tag->u.initrd.start;
676         phys_initrd_size = tag->u.initrd.size;
677         return 0;
678 }
679
680 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
681
682 static int __init parse_tag_serialnr(const struct tag *tag)
683 {
684         system_serial_low = tag->u.serialnr.low;
685         system_serial_high = tag->u.serialnr.high;
686         return 0;
687 }
688
689 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
690
691 static int __init parse_tag_revision(const struct tag *tag)
692 {
693         system_rev = tag->u.revision.rev;
694         return 0;
695 }
696
697 __tagtable(ATAG_REVISION, parse_tag_revision);
698
699 static int __init parse_tag_cmdline(const struct tag *tag)
700 {
701         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
702         return 0;
703 }
704
705 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
706
707 /*
708  * Scan the tag table for this tag, and call its parse function.
709  * The tag table is built by the linker from all the __tagtable
710  * declarations.
711  */
712 static int __init parse_tag(const struct tag *tag)
713 {
714         extern struct tagtable __tagtable_begin, __tagtable_end;
715         struct tagtable *t;
716
717         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
718                 if (tag->hdr.tag == t->tag) {
719                         t->parse(tag);
720                         break;
721                 }
722
723         return t < &__tagtable_end;
724 }
725
726 /*
727  * Parse all tags in the list, checking both the global and architecture
728  * specific tag tables.
729  */
730 static void __init parse_tags(const struct tag *t)
731 {
732         for (; t->hdr.size; t = tag_next(t))
733                 if (!parse_tag(t))
734                         printk(KERN_WARNING
735                                 "Ignoring unrecognised tag 0x%08x\n",
736                                 t->hdr.tag);
737 }
738
739 /*
740  * This holds our defaults.
741  */
742 static struct init_tags {
743         struct tag_header hdr1;
744         struct tag_core   core;
745         struct tag_header hdr2;
746         struct tag_mem32  mem;
747         struct tag_header hdr3;
748 } init_tags __initdata = {
749         { tag_size(tag_core), ATAG_CORE },
750         { 1, PAGE_SIZE, 0xff },
751         { tag_size(tag_mem32), ATAG_MEM },
752         { MEM_SIZE, PHYS_OFFSET },
753         { 0, ATAG_NONE }
754 };
755
756 static void (*init_machine)(void) __initdata;
757
758 static int __init customize_machine(void)
759 {
760         /* customizes platform devices, or adds new ones */
761         if (init_machine)
762                 init_machine();
763         return 0;
764 }
765 arch_initcall(customize_machine);
766
767 void __init setup_arch(char **cmdline_p)
768 {
769         struct tag *tags = (struct tag *)&init_tags;
770         struct machine_desc *mdesc;
771         char *from = default_command_line;
772
773         setup_processor();
774         mdesc = setup_machine(machine_arch_type);
775         machine_name = mdesc->name;
776
777         if (mdesc->soft_reboot)
778                 reboot_setup("s");
779
780         if (mdesc->boot_params)
781                 tags = phys_to_virt(mdesc->boot_params);
782
783         /*
784          * If we have the old style parameters, convert them to
785          * a tag list.
786          */
787         if (tags->hdr.tag != ATAG_CORE)
788                 convert_to_tag_list(tags);
789         if (tags->hdr.tag != ATAG_CORE)
790                 tags = (struct tag *)&init_tags;
791
792         if (mdesc->fixup)
793                 mdesc->fixup(mdesc, tags, &from, &meminfo);
794
795         if (tags->hdr.tag == ATAG_CORE) {
796                 if (meminfo.nr_banks != 0)
797                         squash_mem_tags(tags);
798                 parse_tags(tags);
799         }
800
801         init_mm.start_code = (unsigned long) &_text;
802         init_mm.end_code   = (unsigned long) &_etext;
803         init_mm.end_data   = (unsigned long) &_edata;
804         init_mm.brk        = (unsigned long) &_end;
805
806         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
807         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
808         parse_cmdline(cmdline_p, from);
809         paging_init(&meminfo, mdesc);
810         request_standard_resources(&meminfo, mdesc);
811
812 #ifdef CONFIG_SMP
813         smp_init_cpus();
814 #endif
815
816         cpu_init();
817
818         /*
819          * Set up various architecture-specific pointers
820          */
821         init_arch_irq = mdesc->init_irq;
822         system_timer = mdesc->timer;
823         init_machine = mdesc->init_machine;
824
825 #ifdef CONFIG_VT
826 #if defined(CONFIG_VGA_CONSOLE)
827         conswitchp = &vga_con;
828 #elif defined(CONFIG_DUMMY_CONSOLE)
829         conswitchp = &dummy_con;
830 #endif
831 #endif
832 }
833
834
835 static int __init topology_init(void)
836 {
837         int cpu;
838
839         for_each_possible_cpu(cpu)
840                 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
841
842         return 0;
843 }
844
845 subsys_initcall(topology_init);
846
847 static const char *hwcap_str[] = {
848         "swp",
849         "half",
850         "thumb",
851         "26bit",
852         "fastmult",
853         "fpa",
854         "vfp",
855         "edsp",
856         "java",
857         "iwmmxt",
858         "crunch",
859         NULL
860 };
861
862 static void
863 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
864 {
865         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
866
867         seq_printf(m, "%s size\t\t: %d\n"
868                       "%s assoc\t\t: %d\n"
869                       "%s line length\t: %d\n"
870                       "%s sets\t\t: %d\n",
871                 type, mult << (8 + CACHE_SIZE(cache)),
872                 type, (mult << CACHE_ASSOC(cache)) >> 1,
873                 type, 8 << CACHE_LINE(cache),
874                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
875                             CACHE_LINE(cache)));
876 }
877
878 static int c_show(struct seq_file *m, void *v)
879 {
880         int i;
881
882         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
883                    cpu_name, (int)processor_id & 15, elf_platform);
884
885 #if defined(CONFIG_SMP)
886         for_each_online_cpu(i) {
887                 /*
888                  * glibc reads /proc/cpuinfo to determine the number of
889                  * online processors, looking for lines beginning with
890                  * "processor".  Give glibc what it expects.
891                  */
892                 seq_printf(m, "processor\t: %d\n", i);
893                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
894                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
895                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
896         }
897 #else /* CONFIG_SMP */
898         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
899                    loops_per_jiffy / (500000/HZ),
900                    (loops_per_jiffy / (5000/HZ)) % 100);
901 #endif
902
903         /* dump out the processor features */
904         seq_puts(m, "Features\t: ");
905
906         for (i = 0; hwcap_str[i]; i++)
907                 if (elf_hwcap & (1 << i))
908                         seq_printf(m, "%s ", hwcap_str[i]);
909
910         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
911         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
912
913         if ((processor_id & 0x0008f000) == 0x00000000) {
914                 /* pre-ARM7 */
915                 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
916         } else {
917                 if ((processor_id & 0x0008f000) == 0x00007000) {
918                         /* ARM7 */
919                         seq_printf(m, "CPU variant\t: 0x%02x\n",
920                                    (processor_id >> 16) & 127);
921                 } else {
922                         /* post-ARM7 */
923                         seq_printf(m, "CPU variant\t: 0x%x\n",
924                                    (processor_id >> 20) & 15);
925                 }
926                 seq_printf(m, "CPU part\t: 0x%03x\n",
927                            (processor_id >> 4) & 0xfff);
928         }
929         seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
930
931         {
932                 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
933                 if (cache_info != processor_id) {
934                         seq_printf(m, "Cache type\t: %s\n"
935                                       "Cache clean\t: %s\n"
936                                       "Cache lockdown\t: %s\n"
937                                       "Cache format\t: %s\n",
938                                    cache_types[CACHE_TYPE(cache_info)],
939                                    cache_clean[CACHE_TYPE(cache_info)],
940                                    cache_lockdown[CACHE_TYPE(cache_info)],
941                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
942
943                         if (CACHE_S(cache_info)) {
944                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
945                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
946                         } else {
947                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
948                         }
949                 }
950         }
951
952         seq_puts(m, "\n");
953
954         seq_printf(m, "Hardware\t: %s\n", machine_name);
955         seq_printf(m, "Revision\t: %04x\n", system_rev);
956         seq_printf(m, "Serial\t\t: %08x%08x\n",
957                    system_serial_high, system_serial_low);
958
959         return 0;
960 }
961
962 static void *c_start(struct seq_file *m, loff_t *pos)
963 {
964         return *pos < 1 ? (void *)1 : NULL;
965 }
966
967 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
968 {
969         ++*pos;
970         return NULL;
971 }
972
973 static void c_stop(struct seq_file *m, void *v)
974 {
975 }
976
977 struct seq_operations cpuinfo_op = {
978         .start  = c_start,
979         .next   = c_next,
980         .stop   = c_stop,
981         .show   = c_show
982 };