[ARM] Allow gcc to optimise arm_add_memory a little more
[linux-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 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 #ifndef CONFIG_VFP
358         elf_hwcap &= ~HWCAP_VFP;
359 #endif
360 #ifndef CONFIG_IWMMXT
361         elf_hwcap &= ~HWCAP_IWMMXT;
362 #endif
363
364         cpu_proc_init();
365 }
366
367 /*
368  * cpu_init - initialise one CPU.
369  *
370  * cpu_init dumps the cache information, initialises SMP specific
371  * information, and sets up the per-CPU stacks.
372  */
373 void cpu_init(void)
374 {
375         unsigned int cpu = smp_processor_id();
376         struct stack *stk = &stacks[cpu];
377
378         if (cpu >= NR_CPUS) {
379                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
380                 BUG();
381         }
382
383         if (system_state == SYSTEM_BOOTING)
384                 dump_cpu_info(cpu);
385
386         /*
387          * setup stacks for re-entrant exception handlers
388          */
389         __asm__ (
390         "msr    cpsr_c, %1\n\t"
391         "add    sp, %0, %2\n\t"
392         "msr    cpsr_c, %3\n\t"
393         "add    sp, %0, %4\n\t"
394         "msr    cpsr_c, %5\n\t"
395         "add    sp, %0, %6\n\t"
396         "msr    cpsr_c, %7"
397             :
398             : "r" (stk),
399               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
400               "I" (offsetof(struct stack, irq[0])),
401               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
402               "I" (offsetof(struct stack, abt[0])),
403               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
404               "I" (offsetof(struct stack, und[0])),
405               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
406             : "r14");
407 }
408
409 static struct machine_desc * __init setup_machine(unsigned int nr)
410 {
411         struct machine_desc *list;
412
413         /*
414          * locate machine in the list of supported machines.
415          */
416         list = lookup_machine_type(nr);
417         if (!list) {
418                 printk("Machine configuration botched (nr %d), unable "
419                        "to continue.\n", nr);
420                 while (1);
421         }
422
423         printk("Machine: %s\n", list->name);
424
425         return list;
426 }
427
428 static void __init early_initrd(char **p)
429 {
430         unsigned long start, size;
431
432         start = memparse(*p, p);
433         if (**p == ',') {
434                 size = memparse((*p) + 1, p);
435
436                 phys_initrd_start = start;
437                 phys_initrd_size = size;
438         }
439 }
440 __early_param("initrd=", early_initrd);
441
442 static void __init arm_add_memory(unsigned long start, unsigned long size)
443 {
444         struct membank *bank;
445
446         /*
447          * Ensure that start/size are aligned to a page boundary.
448          * Size is appropriately rounded down, start is rounded up.
449          */
450         size -= start & ~PAGE_MASK;
451
452         bank = &meminfo.bank[meminfo.nr_banks++];
453
454         bank->start = PAGE_ALIGN(start);
455         bank->size  = size & PAGE_MASK;
456         bank->node  = PHYS_TO_NID(start);
457 }
458
459 /*
460  * Pick out the memory size.  We look for mem=size@start,
461  * where start and size are "size[KkMm]"
462  */
463 static void __init early_mem(char **p)
464 {
465         static int usermem __initdata = 0;
466         unsigned long size, start;
467
468         /*
469          * If the user specifies memory size, we
470          * blow away any automatically generated
471          * size.
472          */
473         if (usermem == 0) {
474                 usermem = 1;
475                 meminfo.nr_banks = 0;
476         }
477
478         start = PHYS_OFFSET;
479         size  = memparse(*p, p);
480         if (**p == '@')
481                 start = memparse(*p + 1, p);
482
483         arm_add_memory(start, size);
484 }
485 __early_param("mem=", early_mem);
486
487 /*
488  * Initial parsing of the command line.
489  */
490 static void __init parse_cmdline(char **cmdline_p, char *from)
491 {
492         char c = ' ', *to = command_line;
493         int len = 0;
494
495         for (;;) {
496                 if (c == ' ') {
497                         extern struct early_params __early_begin, __early_end;
498                         struct early_params *p;
499
500                         for (p = &__early_begin; p < &__early_end; p++) {
501                                 int len = strlen(p->arg);
502
503                                 if (memcmp(from, p->arg, len) == 0) {
504                                         if (to != command_line)
505                                                 to -= 1;
506                                         from += len;
507                                         p->fn(&from);
508
509                                         while (*from != ' ' && *from != '\0')
510                                                 from++;
511                                         break;
512                                 }
513                         }
514                 }
515                 c = *from++;
516                 if (!c)
517                         break;
518                 if (COMMAND_LINE_SIZE <= ++len)
519                         break;
520                 *to++ = c;
521         }
522         *to = '\0';
523         *cmdline_p = command_line;
524 }
525
526 static void __init
527 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
528 {
529 #ifdef CONFIG_BLK_DEV_RAM
530         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
531
532         rd_image_start = image_start;
533         rd_prompt = prompt;
534         rd_doload = doload;
535
536         if (rd_sz)
537                 rd_size = rd_sz;
538 #endif
539 }
540
541 static void __init
542 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
543 {
544         struct resource *res;
545         int i;
546
547         kernel_code.start   = virt_to_phys(&_text);
548         kernel_code.end     = virt_to_phys(&_etext - 1);
549         kernel_data.start   = virt_to_phys(&__data_start);
550         kernel_data.end     = virt_to_phys(&_end - 1);
551
552         for (i = 0; i < mi->nr_banks; i++) {
553                 unsigned long virt_start, virt_end;
554
555                 if (mi->bank[i].size == 0)
556                         continue;
557
558                 virt_start = __phys_to_virt(mi->bank[i].start);
559                 virt_end   = virt_start + mi->bank[i].size - 1;
560
561                 res = alloc_bootmem_low(sizeof(*res));
562                 res->name  = "System RAM";
563                 res->start = __virt_to_phys(virt_start);
564                 res->end   = __virt_to_phys(virt_end);
565                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
566
567                 request_resource(&iomem_resource, res);
568
569                 if (kernel_code.start >= res->start &&
570                     kernel_code.end <= res->end)
571                         request_resource(res, &kernel_code);
572                 if (kernel_data.start >= res->start &&
573                     kernel_data.end <= res->end)
574                         request_resource(res, &kernel_data);
575         }
576
577         if (mdesc->video_start) {
578                 video_ram.start = mdesc->video_start;
579                 video_ram.end   = mdesc->video_end;
580                 request_resource(&iomem_resource, &video_ram);
581         }
582
583         /*
584          * Some machines don't have the possibility of ever
585          * possessing lp0, lp1 or lp2
586          */
587         if (mdesc->reserve_lp0)
588                 request_resource(&ioport_resource, &lp0);
589         if (mdesc->reserve_lp1)
590                 request_resource(&ioport_resource, &lp1);
591         if (mdesc->reserve_lp2)
592                 request_resource(&ioport_resource, &lp2);
593 }
594
595 /*
596  *  Tag parsing.
597  *
598  * This is the new way of passing data to the kernel at boot time.  Rather
599  * than passing a fixed inflexible structure to the kernel, we pass a list
600  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
601  * tag for the list to be recognised (to distinguish the tagged list from
602  * a param_struct).  The list is terminated with a zero-length tag (this tag
603  * is not parsed in any way).
604  */
605 static int __init parse_tag_core(const struct tag *tag)
606 {
607         if (tag->hdr.size > 2) {
608                 if ((tag->u.core.flags & 1) == 0)
609                         root_mountflags &= ~MS_RDONLY;
610                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
611         }
612         return 0;
613 }
614
615 __tagtable(ATAG_CORE, parse_tag_core);
616
617 static int __init parse_tag_mem32(const struct tag *tag)
618 {
619         if (meminfo.nr_banks >= NR_BANKS) {
620                 printk(KERN_WARNING
621                        "Ignoring memory bank 0x%08x size %dKB\n",
622                         tag->u.mem.start, tag->u.mem.size / 1024);
623                 return -EINVAL;
624         }
625         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
626         return 0;
627 }
628
629 __tagtable(ATAG_MEM, parse_tag_mem32);
630
631 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
632 struct screen_info screen_info = {
633  .orig_video_lines      = 30,
634  .orig_video_cols       = 80,
635  .orig_video_mode       = 0,
636  .orig_video_ega_bx     = 0,
637  .orig_video_isVGA      = 1,
638  .orig_video_points     = 8
639 };
640
641 static int __init parse_tag_videotext(const struct tag *tag)
642 {
643         screen_info.orig_x            = tag->u.videotext.x;
644         screen_info.orig_y            = tag->u.videotext.y;
645         screen_info.orig_video_page   = tag->u.videotext.video_page;
646         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
647         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
648         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
649         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
650         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
651         screen_info.orig_video_points = tag->u.videotext.video_points;
652         return 0;
653 }
654
655 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
656 #endif
657
658 static int __init parse_tag_ramdisk(const struct tag *tag)
659 {
660         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
661                       (tag->u.ramdisk.flags & 2) == 0,
662                       tag->u.ramdisk.start, tag->u.ramdisk.size);
663         return 0;
664 }
665
666 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
667
668 static int __init parse_tag_initrd(const struct tag *tag)
669 {
670         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
671                 "please update your bootloader.\n");
672         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
673         phys_initrd_size = tag->u.initrd.size;
674         return 0;
675 }
676
677 __tagtable(ATAG_INITRD, parse_tag_initrd);
678
679 static int __init parse_tag_initrd2(const struct tag *tag)
680 {
681         phys_initrd_start = tag->u.initrd.start;
682         phys_initrd_size = tag->u.initrd.size;
683         return 0;
684 }
685
686 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
687
688 static int __init parse_tag_serialnr(const struct tag *tag)
689 {
690         system_serial_low = tag->u.serialnr.low;
691         system_serial_high = tag->u.serialnr.high;
692         return 0;
693 }
694
695 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
696
697 static int __init parse_tag_revision(const struct tag *tag)
698 {
699         system_rev = tag->u.revision.rev;
700         return 0;
701 }
702
703 __tagtable(ATAG_REVISION, parse_tag_revision);
704
705 static int __init parse_tag_cmdline(const struct tag *tag)
706 {
707         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
708         return 0;
709 }
710
711 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
712
713 /*
714  * Scan the tag table for this tag, and call its parse function.
715  * The tag table is built by the linker from all the __tagtable
716  * declarations.
717  */
718 static int __init parse_tag(const struct tag *tag)
719 {
720         extern struct tagtable __tagtable_begin, __tagtable_end;
721         struct tagtable *t;
722
723         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
724                 if (tag->hdr.tag == t->tag) {
725                         t->parse(tag);
726                         break;
727                 }
728
729         return t < &__tagtable_end;
730 }
731
732 /*
733  * Parse all tags in the list, checking both the global and architecture
734  * specific tag tables.
735  */
736 static void __init parse_tags(const struct tag *t)
737 {
738         for (; t->hdr.size; t = tag_next(t))
739                 if (!parse_tag(t))
740                         printk(KERN_WARNING
741                                 "Ignoring unrecognised tag 0x%08x\n",
742                                 t->hdr.tag);
743 }
744
745 /*
746  * This holds our defaults.
747  */
748 static struct init_tags {
749         struct tag_header hdr1;
750         struct tag_core   core;
751         struct tag_header hdr2;
752         struct tag_mem32  mem;
753         struct tag_header hdr3;
754 } init_tags __initdata = {
755         { tag_size(tag_core), ATAG_CORE },
756         { 1, PAGE_SIZE, 0xff },
757         { tag_size(tag_mem32), ATAG_MEM },
758         { MEM_SIZE, PHYS_OFFSET },
759         { 0, ATAG_NONE }
760 };
761
762 static void (*init_machine)(void) __initdata;
763
764 static int __init customize_machine(void)
765 {
766         /* customizes platform devices, or adds new ones */
767         if (init_machine)
768                 init_machine();
769         return 0;
770 }
771 arch_initcall(customize_machine);
772
773 void __init setup_arch(char **cmdline_p)
774 {
775         struct tag *tags = (struct tag *)&init_tags;
776         struct machine_desc *mdesc;
777         char *from = default_command_line;
778
779         setup_processor();
780         mdesc = setup_machine(machine_arch_type);
781         machine_name = mdesc->name;
782
783         if (mdesc->soft_reboot)
784                 reboot_setup("s");
785
786         if (mdesc->boot_params)
787                 tags = phys_to_virt(mdesc->boot_params);
788
789         /*
790          * If we have the old style parameters, convert them to
791          * a tag list.
792          */
793         if (tags->hdr.tag != ATAG_CORE)
794                 convert_to_tag_list(tags);
795         if (tags->hdr.tag != ATAG_CORE)
796                 tags = (struct tag *)&init_tags;
797
798         if (mdesc->fixup)
799                 mdesc->fixup(mdesc, tags, &from, &meminfo);
800
801         if (tags->hdr.tag == ATAG_CORE) {
802                 if (meminfo.nr_banks != 0)
803                         squash_mem_tags(tags);
804                 parse_tags(tags);
805         }
806
807         init_mm.start_code = (unsigned long) &_text;
808         init_mm.end_code   = (unsigned long) &_etext;
809         init_mm.end_data   = (unsigned long) &_edata;
810         init_mm.brk        = (unsigned long) &_end;
811
812         memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
813         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
814         parse_cmdline(cmdline_p, from);
815         paging_init(&meminfo, mdesc);
816         request_standard_resources(&meminfo, mdesc);
817
818 #ifdef CONFIG_SMP
819         smp_init_cpus();
820 #endif
821
822         cpu_init();
823
824         /*
825          * Set up various architecture-specific pointers
826          */
827         init_arch_irq = mdesc->init_irq;
828         system_timer = mdesc->timer;
829         init_machine = mdesc->init_machine;
830
831 #ifdef CONFIG_VT
832 #if defined(CONFIG_VGA_CONSOLE)
833         conswitchp = &vga_con;
834 #elif defined(CONFIG_DUMMY_CONSOLE)
835         conswitchp = &dummy_con;
836 #endif
837 #endif
838 }
839
840
841 static int __init topology_init(void)
842 {
843         int cpu;
844
845         for_each_possible_cpu(cpu)
846                 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
847
848         return 0;
849 }
850
851 subsys_initcall(topology_init);
852
853 static const char *hwcap_str[] = {
854         "swp",
855         "half",
856         "thumb",
857         "26bit",
858         "fastmult",
859         "fpa",
860         "vfp",
861         "edsp",
862         "java",
863         "iwmmxt",
864         NULL
865 };
866
867 static void
868 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
869 {
870         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
871
872         seq_printf(m, "%s size\t\t: %d\n"
873                       "%s assoc\t\t: %d\n"
874                       "%s line length\t: %d\n"
875                       "%s sets\t\t: %d\n",
876                 type, mult << (8 + CACHE_SIZE(cache)),
877                 type, (mult << CACHE_ASSOC(cache)) >> 1,
878                 type, 8 << CACHE_LINE(cache),
879                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
880                             CACHE_LINE(cache)));
881 }
882
883 static int c_show(struct seq_file *m, void *v)
884 {
885         int i;
886
887         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
888                    cpu_name, (int)processor_id & 15, elf_platform);
889
890 #if defined(CONFIG_SMP)
891         for_each_online_cpu(i) {
892                 /*
893                  * glibc reads /proc/cpuinfo to determine the number of
894                  * online processors, looking for lines beginning with
895                  * "processor".  Give glibc what it expects.
896                  */
897                 seq_printf(m, "processor\t: %d\n", i);
898                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
899                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
900                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
901         }
902 #else /* CONFIG_SMP */
903         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
904                    loops_per_jiffy / (500000/HZ),
905                    (loops_per_jiffy / (5000/HZ)) % 100);
906 #endif
907
908         /* dump out the processor features */
909         seq_puts(m, "Features\t: ");
910
911         for (i = 0; hwcap_str[i]; i++)
912                 if (elf_hwcap & (1 << i))
913                         seq_printf(m, "%s ", hwcap_str[i]);
914
915         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
916         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
917
918         if ((processor_id & 0x0008f000) == 0x00000000) {
919                 /* pre-ARM7 */
920                 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
921         } else {
922                 if ((processor_id & 0x0008f000) == 0x00007000) {
923                         /* ARM7 */
924                         seq_printf(m, "CPU variant\t: 0x%02x\n",
925                                    (processor_id >> 16) & 127);
926                 } else {
927                         /* post-ARM7 */
928                         seq_printf(m, "CPU variant\t: 0x%x\n",
929                                    (processor_id >> 20) & 15);
930                 }
931                 seq_printf(m, "CPU part\t: 0x%03x\n",
932                            (processor_id >> 4) & 0xfff);
933         }
934         seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
935
936         {
937                 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
938                 if (cache_info != processor_id) {
939                         seq_printf(m, "Cache type\t: %s\n"
940                                       "Cache clean\t: %s\n"
941                                       "Cache lockdown\t: %s\n"
942                                       "Cache format\t: %s\n",
943                                    cache_types[CACHE_TYPE(cache_info)],
944                                    cache_clean[CACHE_TYPE(cache_info)],
945                                    cache_lockdown[CACHE_TYPE(cache_info)],
946                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
947
948                         if (CACHE_S(cache_info)) {
949                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
950                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
951                         } else {
952                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
953                         }
954                 }
955         }
956
957         seq_puts(m, "\n");
958
959         seq_printf(m, "Hardware\t: %s\n", machine_name);
960         seq_printf(m, "Revision\t: %04x\n", system_rev);
961         seq_printf(m, "Serial\t\t: %08x%08x\n",
962                    system_serial_high, system_serial_low);
963
964         return 0;
965 }
966
967 static void *c_start(struct seq_file *m, loff_t *pos)
968 {
969         return *pos < 1 ? (void *)1 : NULL;
970 }
971
972 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
973 {
974         ++*pos;
975         return NULL;
976 }
977
978 static void c_stop(struct seq_file *m, void *v)
979 {
980 }
981
982 struct seq_operations cpuinfo_op = {
983         .start  = c_start,
984         .next   = c_next,
985         .stop   = c_stop,
986         .show   = c_show
987 };